compat / mingw.con commit Ninth batch for 2.20 (8858448)
   1#include "../git-compat-util.h"
   2#include "win32.h"
   3#include <conio.h>
   4#include <wchar.h>
   5#include "../strbuf.h"
   6#include "../run-command.h"
   7#include "../cache.h"
   8#include "win32/lazyload.h"
   9
  10#define HCAST(type, handle) ((type)(intptr_t)handle)
  11
  12static const int delay[] = { 0, 1, 10, 20, 40 };
  13
  14int err_win_to_posix(DWORD winerr)
  15{
  16        int error = ENOSYS;
  17        switch(winerr) {
  18        case ERROR_ACCESS_DENIED: error = EACCES; break;
  19        case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  20        case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  21        case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  22        case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  23        case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  24        case ERROR_BAD_COMMAND: error = EIO; break;
  25        case ERROR_BAD_DEVICE: error = ENODEV; break;
  26        case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  27        case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  28        case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  29        case ERROR_BAD_LENGTH: error = EINVAL; break;
  30        case ERROR_BAD_PATHNAME: error = ENOENT; break;
  31        case ERROR_BAD_PIPE: error = EPIPE; break;
  32        case ERROR_BAD_UNIT: error = ENODEV; break;
  33        case ERROR_BAD_USERNAME: error = EINVAL; break;
  34        case ERROR_BROKEN_PIPE: error = EPIPE; break;
  35        case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  36        case ERROR_BUSY: error = EBUSY; break;
  37        case ERROR_BUSY_DRIVE: error = EBUSY; break;
  38        case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  39        case ERROR_CANNOT_MAKE: error = EACCES; break;
  40        case ERROR_CANTOPEN: error = EIO; break;
  41        case ERROR_CANTREAD: error = EIO; break;
  42        case ERROR_CANTWRITE: error = EIO; break;
  43        case ERROR_CRC: error = EIO; break;
  44        case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  45        case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  46        case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  47        case ERROR_DIRECTORY: error = EINVAL; break;
  48        case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  49        case ERROR_DISK_CHANGE: error = EIO; break;
  50        case ERROR_DISK_FULL: error = ENOSPC; break;
  51        case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  52        case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  53        case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  54        case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  55        case ERROR_FILE_EXISTS: error = EEXIST; break;
  56        case ERROR_FILE_INVALID: error = ENODEV; break;
  57        case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  58        case ERROR_GEN_FAILURE: error = EIO; break;
  59        case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  60        case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  61        case ERROR_INVALID_ACCESS: error = EACCES; break;
  62        case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  63        case ERROR_INVALID_BLOCK: error = EFAULT; break;
  64        case ERROR_INVALID_DATA: error = EINVAL; break;
  65        case ERROR_INVALID_DRIVE: error = ENODEV; break;
  66        case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  67        case ERROR_INVALID_FLAGS: error = EINVAL; break;
  68        case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  69        case ERROR_INVALID_HANDLE: error = EBADF; break;
  70        case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  71        case ERROR_INVALID_NAME: error = EINVAL; break;
  72        case ERROR_INVALID_OWNER: error = EINVAL; break;
  73        case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  74        case ERROR_INVALID_PASSWORD: error = EPERM; break;
  75        case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  76        case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  77        case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  78        case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  79        case ERROR_IO_DEVICE: error = EIO; break;
  80        case ERROR_IO_INCOMPLETE: error = EINTR; break;
  81        case ERROR_LOCKED: error = EBUSY; break;
  82        case ERROR_LOCK_VIOLATION: error = EACCES; break;
  83        case ERROR_LOGON_FAILURE: error = EACCES; break;
  84        case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  85        case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  86        case ERROR_MORE_DATA: error = EPIPE; break;
  87        case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  88        case ERROR_NOACCESS: error = EFAULT; break;
  89        case ERROR_NONE_MAPPED: error = EINVAL; break;
  90        case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  91        case ERROR_NOT_READY: error = EAGAIN; break;
  92        case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  93        case ERROR_NO_DATA: error = EPIPE; break;
  94        case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  95        case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  96        case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  97        case ERROR_OPEN_FAILED: error = EIO; break;
  98        case ERROR_OPEN_FILES: error = EBUSY; break;
  99        case ERROR_OPERATION_ABORTED: error = EINTR; break;
 100        case ERROR_OUTOFMEMORY: error = ENOMEM; break;
 101        case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
 102        case ERROR_PATH_BUSY: error = EBUSY; break;
 103        case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
 104        case ERROR_PIPE_BUSY: error = EBUSY; break;
 105        case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 106        case ERROR_PIPE_LISTENING: error = EPIPE; break;
 107        case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 108        case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 109        case ERROR_READ_FAULT: error = EIO; break;
 110        case ERROR_SEEK: error = EIO; break;
 111        case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 112        case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 113        case ERROR_SHARING_VIOLATION: error = EACCES; break;
 114        case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 115        case ERROR_SWAPERROR: error = ENOENT; break;
 116        case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 117        case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 118        case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 119        case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 120        case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 121        case ERROR_WRITE_FAULT: error = EIO; break;
 122        case ERROR_WRITE_PROTECT: error = EROFS; break;
 123        }
 124        return error;
 125}
 126
 127static inline int is_file_in_use_error(DWORD errcode)
 128{
 129        switch (errcode) {
 130        case ERROR_SHARING_VIOLATION:
 131        case ERROR_ACCESS_DENIED:
 132                return 1;
 133        }
 134
 135        return 0;
 136}
 137
 138static int read_yes_no_answer(void)
 139{
 140        char answer[1024];
 141
 142        if (fgets(answer, sizeof(answer), stdin)) {
 143                size_t answer_len = strlen(answer);
 144                int got_full_line = 0, c;
 145
 146                /* remove the newline */
 147                if (answer_len >= 2 && answer[answer_len-2] == '\r') {
 148                        answer[answer_len-2] = '\0';
 149                        got_full_line = 1;
 150                } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
 151                        answer[answer_len-1] = '\0';
 152                        got_full_line = 1;
 153                }
 154                /* flush the buffer in case we did not get the full line */
 155                if (!got_full_line)
 156                        while ((c = getchar()) != EOF && c != '\n')
 157                                ;
 158        } else
 159                /* we could not read, return the
 160                 * default answer which is no */
 161                return 0;
 162
 163        if (tolower(answer[0]) == 'y' && !answer[1])
 164                return 1;
 165        if (!strncasecmp(answer, "yes", sizeof(answer)))
 166                return 1;
 167        if (tolower(answer[0]) == 'n' && !answer[1])
 168                return 0;
 169        if (!strncasecmp(answer, "no", sizeof(answer)))
 170                return 0;
 171
 172        /* did not find an answer we understand */
 173        return -1;
 174}
 175
 176static int ask_yes_no_if_possible(const char *format, ...)
 177{
 178        char question[4096];
 179        const char *retry_hook[] = { NULL, NULL, NULL };
 180        va_list args;
 181
 182        va_start(args, format);
 183        vsnprintf(question, sizeof(question), format, args);
 184        va_end(args);
 185
 186        if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) {
 187                retry_hook[1] = question;
 188                return !run_command_v_opt(retry_hook, 0);
 189        }
 190
 191        if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
 192                return 0;
 193
 194        while (1) {
 195                int answer;
 196                fprintf(stderr, "%s (y/n) ", question);
 197
 198                if ((answer = read_yes_no_answer()) >= 0)
 199                        return answer;
 200
 201                fprintf(stderr, "Sorry, I did not understand your answer. "
 202                                "Please type 'y' or 'n'\n");
 203        }
 204}
 205
 206/* Normalizes NT paths as returned by some low-level APIs. */
 207static wchar_t *normalize_ntpath(wchar_t *wbuf)
 208{
 209        int i;
 210        /* fix absolute path prefixes */
 211        if (wbuf[0] == '\\') {
 212                /* strip NT namespace prefixes */
 213                if (!wcsncmp(wbuf, L"\\??\\", 4) ||
 214                    !wcsncmp(wbuf, L"\\\\?\\", 4))
 215                        wbuf += 4;
 216                else if (!wcsnicmp(wbuf, L"\\DosDevices\\", 12))
 217                        wbuf += 12;
 218                /* replace remaining '...UNC\' with '\\' */
 219                if (!wcsnicmp(wbuf, L"UNC\\", 4)) {
 220                        wbuf += 2;
 221                        *wbuf = '\\';
 222                }
 223        }
 224        /* convert backslashes to slashes */
 225        for (i = 0; wbuf[i]; i++)
 226                if (wbuf[i] == '\\')
 227                        wbuf[i] = '/';
 228        return wbuf;
 229}
 230
 231int mingw_unlink(const char *pathname)
 232{
 233        int ret, tries = 0;
 234        wchar_t wpathname[MAX_PATH];
 235        if (xutftowcs_path(wpathname, pathname) < 0)
 236                return -1;
 237
 238        /* read-only files cannot be removed */
 239        _wchmod(wpathname, 0666);
 240        while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 241                if (!is_file_in_use_error(GetLastError()))
 242                        break;
 243                /*
 244                 * We assume that some other process had the source or
 245                 * destination file open at the wrong moment and retry.
 246                 * In order to give the other process a higher chance to
 247                 * complete its operation, we give up our time slice now.
 248                 * If we have to retry again, we do sleep a bit.
 249                 */
 250                Sleep(delay[tries]);
 251                tries++;
 252        }
 253        while (ret == -1 && is_file_in_use_error(GetLastError()) &&
 254               ask_yes_no_if_possible("Unlink of file '%s' failed. "
 255                        "Should I try again?", pathname))
 256               ret = _wunlink(wpathname);
 257        return ret;
 258}
 259
 260static int is_dir_empty(const wchar_t *wpath)
 261{
 262        WIN32_FIND_DATAW findbuf;
 263        HANDLE handle;
 264        wchar_t wbuf[MAX_PATH + 2];
 265        wcscpy(wbuf, wpath);
 266        wcscat(wbuf, L"\\*");
 267        handle = FindFirstFileW(wbuf, &findbuf);
 268        if (handle == INVALID_HANDLE_VALUE)
 269                return GetLastError() == ERROR_NO_MORE_FILES;
 270
 271        while (!wcscmp(findbuf.cFileName, L".") ||
 272                        !wcscmp(findbuf.cFileName, L".."))
 273                if (!FindNextFileW(handle, &findbuf)) {
 274                        DWORD err = GetLastError();
 275                        FindClose(handle);
 276                        return err == ERROR_NO_MORE_FILES;
 277                }
 278        FindClose(handle);
 279        return 0;
 280}
 281
 282int mingw_rmdir(const char *pathname)
 283{
 284        int ret, tries = 0;
 285        wchar_t wpathname[MAX_PATH];
 286        if (xutftowcs_path(wpathname, pathname) < 0)
 287                return -1;
 288
 289        while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 290                if (!is_file_in_use_error(GetLastError()))
 291                        errno = err_win_to_posix(GetLastError());
 292                if (errno != EACCES)
 293                        break;
 294                if (!is_dir_empty(wpathname)) {
 295                        errno = ENOTEMPTY;
 296                        break;
 297                }
 298                /*
 299                 * We assume that some other process had the source or
 300                 * destination file open at the wrong moment and retry.
 301                 * In order to give the other process a higher chance to
 302                 * complete its operation, we give up our time slice now.
 303                 * If we have to retry again, we do sleep a bit.
 304                 */
 305                Sleep(delay[tries]);
 306                tries++;
 307        }
 308        while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
 309               ask_yes_no_if_possible("Deletion of directory '%s' failed. "
 310                        "Should I try again?", pathname))
 311               ret = _wrmdir(wpathname);
 312        return ret;
 313}
 314
 315static inline int needs_hiding(const char *path)
 316{
 317        const char *basename;
 318
 319        if (hide_dotfiles == HIDE_DOTFILES_FALSE)
 320                return 0;
 321
 322        /* We cannot use basename(), as it would remove trailing slashes */
 323        mingw_skip_dos_drive_prefix((char **)&path);
 324        if (!*path)
 325                return 0;
 326
 327        for (basename = path; *path; path++)
 328                if (is_dir_sep(*path)) {
 329                        do {
 330                                path++;
 331                        } while (is_dir_sep(*path));
 332                        /* ignore trailing slashes */
 333                        if (*path)
 334                                basename = path;
 335                }
 336
 337        if (hide_dotfiles == HIDE_DOTFILES_TRUE)
 338                return *basename == '.';
 339
 340        assert(hide_dotfiles == HIDE_DOTFILES_DOTGITONLY);
 341        return !strncasecmp(".git", basename, 4) &&
 342                (!basename[4] || is_dir_sep(basename[4]));
 343}
 344
 345static int set_hidden_flag(const wchar_t *path, int set)
 346{
 347        DWORD original = GetFileAttributesW(path), modified;
 348        if (set)
 349                modified = original | FILE_ATTRIBUTE_HIDDEN;
 350        else
 351                modified = original & ~FILE_ATTRIBUTE_HIDDEN;
 352        if (original == modified || SetFileAttributesW(path, modified))
 353                return 0;
 354        errno = err_win_to_posix(GetLastError());
 355        return -1;
 356}
 357
 358int mingw_mkdir(const char *path, int mode)
 359{
 360        int ret;
 361        wchar_t wpath[MAX_PATH];
 362        if (xutftowcs_path(wpath, path) < 0)
 363                return -1;
 364        ret = _wmkdir(wpath);
 365        if (!ret && needs_hiding(path))
 366                return set_hidden_flag(wpath, 1);
 367        return ret;
 368}
 369
 370/*
 371 * Calling CreateFile() using FILE_APPEND_DATA and without FILE_WRITE_DATA
 372 * is documented in [1] as opening a writable file handle in append mode.
 373 * (It is believed that) this is atomic since it is maintained by the
 374 * kernel unlike the O_APPEND flag which is racily maintained by the CRT.
 375 *
 376 * [1] https://docs.microsoft.com/en-us/windows/desktop/fileio/file-access-rights-constants
 377 *
 378 * This trick does not appear to work for named pipes.  Instead it creates
 379 * a named pipe client handle that cannot be written to.  Callers should
 380 * just use the regular _wopen() for them.  (And since client handle gets
 381 * bound to a unique server handle, it isn't really an issue.)
 382 */
 383static int mingw_open_append(wchar_t const *wfilename, int oflags, ...)
 384{
 385        HANDLE handle;
 386        int fd;
 387        DWORD create = (oflags & O_CREAT) ? OPEN_ALWAYS : OPEN_EXISTING;
 388
 389        /* only these flags are supported */
 390        if ((oflags & ~O_CREAT) != (O_WRONLY | O_APPEND))
 391                return errno = ENOSYS, -1;
 392
 393        /*
 394         * FILE_SHARE_WRITE is required to permit child processes
 395         * to append to the file.
 396         */
 397        handle = CreateFileW(wfilename, FILE_APPEND_DATA,
 398                        FILE_SHARE_WRITE | FILE_SHARE_READ,
 399                        NULL, create, FILE_ATTRIBUTE_NORMAL, NULL);
 400        if (handle == INVALID_HANDLE_VALUE)
 401                return errno = err_win_to_posix(GetLastError()), -1;
 402
 403        /*
 404         * No O_APPEND here, because the CRT uses it only to reset the
 405         * file pointer to EOF before each write(); but that is not
 406         * necessary (and may lead to races) for a file created with
 407         * FILE_APPEND_DATA.
 408         */
 409        fd = _open_osfhandle((intptr_t)handle, O_BINARY);
 410        if (fd < 0)
 411                CloseHandle(handle);
 412        return fd;
 413}
 414
 415/*
 416 * Does the pathname map to the local named pipe filesystem?
 417 * That is, does it have a "//./pipe/" prefix?
 418 */
 419static int is_local_named_pipe_path(const char *filename)
 420{
 421        return (is_dir_sep(filename[0]) &&
 422                is_dir_sep(filename[1]) &&
 423                filename[2] == '.'  &&
 424                is_dir_sep(filename[3]) &&
 425                !strncasecmp(filename+4, "pipe", 4) &&
 426                is_dir_sep(filename[8]) &&
 427                filename[9]);
 428}
 429
 430int mingw_open (const char *filename, int oflags, ...)
 431{
 432        typedef int (*open_fn_t)(wchar_t const *wfilename, int oflags, ...);
 433        va_list args;
 434        unsigned mode;
 435        int fd;
 436        wchar_t wfilename[MAX_PATH];
 437        open_fn_t open_fn;
 438
 439        va_start(args, oflags);
 440        mode = va_arg(args, int);
 441        va_end(args);
 442
 443        if (filename && !strcmp(filename, "/dev/null"))
 444                filename = "nul";
 445
 446        if ((oflags & O_APPEND) && !is_local_named_pipe_path(filename))
 447                open_fn = mingw_open_append;
 448        else
 449                open_fn = _wopen;
 450
 451        if (xutftowcs_path(wfilename, filename) < 0)
 452                return -1;
 453        fd = open_fn(wfilename, oflags, mode);
 454
 455        if (fd < 0 && (oflags & O_ACCMODE) != O_RDONLY && errno == EACCES) {
 456                DWORD attrs = GetFileAttributesW(wfilename);
 457                if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 458                        errno = EISDIR;
 459        }
 460        if ((oflags & O_CREAT) && needs_hiding(filename)) {
 461                /*
 462                 * Internally, _wopen() uses the CreateFile() API which errors
 463                 * out with an ERROR_ACCESS_DENIED if CREATE_ALWAYS was
 464                 * specified and an already existing file's attributes do not
 465                 * match *exactly*. As there is no mode or flag we can set that
 466                 * would correspond to FILE_ATTRIBUTE_HIDDEN, let's just try
 467                 * again *without* the O_CREAT flag (that corresponds to the
 468                 * CREATE_ALWAYS flag of CreateFile()).
 469                 */
 470                if (fd < 0 && errno == EACCES)
 471                        fd = open_fn(wfilename, oflags & ~O_CREAT, mode);
 472                if (fd >= 0 && set_hidden_flag(wfilename, 1))
 473                        warning("could not mark '%s' as hidden.", filename);
 474        }
 475        return fd;
 476}
 477
 478static BOOL WINAPI ctrl_ignore(DWORD type)
 479{
 480        return TRUE;
 481}
 482
 483#undef fgetc
 484int mingw_fgetc(FILE *stream)
 485{
 486        int ch;
 487        if (!isatty(_fileno(stream)))
 488                return fgetc(stream);
 489
 490        SetConsoleCtrlHandler(ctrl_ignore, TRUE);
 491        while (1) {
 492                ch = fgetc(stream);
 493                if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
 494                        break;
 495
 496                /* Ctrl+C was pressed, simulate SIGINT and retry */
 497                mingw_raise(SIGINT);
 498        }
 499        SetConsoleCtrlHandler(ctrl_ignore, FALSE);
 500        return ch;
 501}
 502
 503#undef fopen
 504FILE *mingw_fopen (const char *filename, const char *otype)
 505{
 506        int hide = needs_hiding(filename);
 507        FILE *file;
 508        wchar_t wfilename[MAX_PATH], wotype[4];
 509        if (filename && !strcmp(filename, "/dev/null"))
 510                filename = "nul";
 511        if (xutftowcs_path(wfilename, filename) < 0 ||
 512                xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 513                return NULL;
 514        if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
 515                error("could not unhide %s", filename);
 516                return NULL;
 517        }
 518        file = _wfopen(wfilename, wotype);
 519        if (!file && GetLastError() == ERROR_INVALID_NAME)
 520                errno = ENOENT;
 521        if (file && hide && set_hidden_flag(wfilename, 1))
 522                warning("could not mark '%s' as hidden.", filename);
 523        return file;
 524}
 525
 526FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 527{
 528        int hide = needs_hiding(filename);
 529        FILE *file;
 530        wchar_t wfilename[MAX_PATH], wotype[4];
 531        if (filename && !strcmp(filename, "/dev/null"))
 532                filename = "nul";
 533        if (xutftowcs_path(wfilename, filename) < 0 ||
 534                xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 535                return NULL;
 536        if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
 537                error("could not unhide %s", filename);
 538                return NULL;
 539        }
 540        file = _wfreopen(wfilename, wotype, stream);
 541        if (file && hide && set_hidden_flag(wfilename, 1))
 542                warning("could not mark '%s' as hidden.", filename);
 543        return file;
 544}
 545
 546#undef fflush
 547int mingw_fflush(FILE *stream)
 548{
 549        int ret = fflush(stream);
 550
 551        /*
 552         * write() is used behind the scenes of stdio output functions.
 553         * Since git code does not check for errors after each stdio write
 554         * operation, it can happen that write() is called by a later
 555         * stdio function even if an earlier write() call failed. In the
 556         * case of a pipe whose readable end was closed, only the first
 557         * call to write() reports EPIPE on Windows. Subsequent write()
 558         * calls report EINVAL. It is impossible to notice whether this
 559         * fflush invocation triggered such a case, therefore, we have to
 560         * catch all EINVAL errors whole-sale.
 561         */
 562        if (ret && errno == EINVAL)
 563                errno = EPIPE;
 564
 565        return ret;
 566}
 567
 568#undef write
 569ssize_t mingw_write(int fd, const void *buf, size_t len)
 570{
 571        ssize_t result = write(fd, buf, len);
 572
 573        if (result < 0 && errno == EINVAL && buf) {
 574                /* check if fd is a pipe */
 575                HANDLE h = (HANDLE) _get_osfhandle(fd);
 576                if (GetFileType(h) == FILE_TYPE_PIPE)
 577                        errno = EPIPE;
 578                else
 579                        errno = EINVAL;
 580        }
 581
 582        return result;
 583}
 584
 585int mingw_access(const char *filename, int mode)
 586{
 587        wchar_t wfilename[MAX_PATH];
 588        if (xutftowcs_path(wfilename, filename) < 0)
 589                return -1;
 590        /* X_OK is not supported by the MSVCRT version */
 591        return _waccess(wfilename, mode & ~X_OK);
 592}
 593
 594int mingw_chdir(const char *dirname)
 595{
 596        wchar_t wdirname[MAX_PATH];
 597        if (xutftowcs_path(wdirname, dirname) < 0)
 598                return -1;
 599        return _wchdir(wdirname);
 600}
 601
 602int mingw_chmod(const char *filename, int mode)
 603{
 604        wchar_t wfilename[MAX_PATH];
 605        if (xutftowcs_path(wfilename, filename) < 0)
 606                return -1;
 607        return _wchmod(wfilename, mode);
 608}
 609
 610/*
 611 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 612 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 613 */
 614static inline long long filetime_to_hnsec(const FILETIME *ft)
 615{
 616        long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 617        /* Windows to Unix Epoch conversion */
 618        return winTime - 116444736000000000LL;
 619}
 620
 621static inline void filetime_to_timespec(const FILETIME *ft, struct timespec *ts)
 622{
 623        long long hnsec = filetime_to_hnsec(ft);
 624        ts->tv_sec = (time_t)(hnsec / 10000000);
 625        ts->tv_nsec = (hnsec % 10000000) * 100;
 626}
 627
 628/**
 629 * Verifies that safe_create_leading_directories() would succeed.
 630 */
 631static int has_valid_directory_prefix(wchar_t *wfilename)
 632{
 633        int n = wcslen(wfilename);
 634
 635        while (n > 0) {
 636                wchar_t c = wfilename[--n];
 637                DWORD attributes;
 638
 639                if (!is_dir_sep(c))
 640                        continue;
 641
 642                wfilename[n] = L'\0';
 643                attributes = GetFileAttributesW(wfilename);
 644                wfilename[n] = c;
 645                if (attributes == FILE_ATTRIBUTE_DIRECTORY ||
 646                                attributes == FILE_ATTRIBUTE_DEVICE)
 647                        return 1;
 648                if (attributes == INVALID_FILE_ATTRIBUTES)
 649                        switch (GetLastError()) {
 650                        case ERROR_PATH_NOT_FOUND:
 651                                continue;
 652                        case ERROR_FILE_NOT_FOUND:
 653                                /* This implies parent directory exists. */
 654                                return 1;
 655                        }
 656                return 0;
 657        }
 658        return 1;
 659}
 660
 661/* We keep the do_lstat code in a separate function to avoid recursion.
 662 * When a path ends with a slash, the stat will fail with ENOENT. In
 663 * this case, we strip the trailing slashes and stat again.
 664 *
 665 * If follow is true then act like stat() and report on the link
 666 * target. Otherwise report on the link itself.
 667 */
 668static int do_lstat(int follow, const char *file_name, struct stat *buf)
 669{
 670        WIN32_FILE_ATTRIBUTE_DATA fdata;
 671        wchar_t wfilename[MAX_PATH];
 672        if (xutftowcs_path(wfilename, file_name) < 0)
 673                return -1;
 674
 675        if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
 676                buf->st_ino = 0;
 677                buf->st_gid = 0;
 678                buf->st_uid = 0;
 679                buf->st_nlink = 1;
 680                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 681                buf->st_size = fdata.nFileSizeLow |
 682                        (((off_t)fdata.nFileSizeHigh)<<32);
 683                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 684                filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim));
 685                filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim));
 686                filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim));
 687                if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 688                        WIN32_FIND_DATAW findbuf;
 689                        HANDLE handle = FindFirstFileW(wfilename, &findbuf);
 690                        if (handle != INVALID_HANDLE_VALUE) {
 691                                if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 692                                                (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 693                                        if (follow) {
 694                                                char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 695                                                buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 696                                        } else {
 697                                                buf->st_mode = S_IFLNK;
 698                                        }
 699                                        buf->st_mode |= S_IREAD;
 700                                        if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 701                                                buf->st_mode |= S_IWRITE;
 702                                }
 703                                FindClose(handle);
 704                        }
 705                }
 706                return 0;
 707        }
 708        switch (GetLastError()) {
 709        case ERROR_ACCESS_DENIED:
 710        case ERROR_SHARING_VIOLATION:
 711        case ERROR_LOCK_VIOLATION:
 712        case ERROR_SHARING_BUFFER_EXCEEDED:
 713                errno = EACCES;
 714                break;
 715        case ERROR_BUFFER_OVERFLOW:
 716                errno = ENAMETOOLONG;
 717                break;
 718        case ERROR_NOT_ENOUGH_MEMORY:
 719                errno = ENOMEM;
 720                break;
 721        case ERROR_PATH_NOT_FOUND:
 722                if (!has_valid_directory_prefix(wfilename)) {
 723                        errno = ENOTDIR;
 724                        break;
 725                }
 726                /* fallthru */
 727        default:
 728                errno = ENOENT;
 729                break;
 730        }
 731        return -1;
 732}
 733
 734/* We provide our own lstat/fstat functions, since the provided
 735 * lstat/fstat functions are so slow. These stat functions are
 736 * tailored for Git's usage (read: fast), and are not meant to be
 737 * complete. Note that Git stat()s are redirected to mingw_lstat()
 738 * too, since Windows doesn't really handle symlinks that well.
 739 */
 740static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 741{
 742        int namelen;
 743        char alt_name[PATH_MAX];
 744
 745        if (!do_lstat(follow, file_name, buf))
 746                return 0;
 747
 748        /* if file_name ended in a '/', Windows returned ENOENT;
 749         * try again without trailing slashes
 750         */
 751        if (errno != ENOENT)
 752                return -1;
 753
 754        namelen = strlen(file_name);
 755        if (namelen && file_name[namelen-1] != '/')
 756                return -1;
 757        while (namelen && file_name[namelen-1] == '/')
 758                --namelen;
 759        if (!namelen || namelen >= PATH_MAX)
 760                return -1;
 761
 762        memcpy(alt_name, file_name, namelen);
 763        alt_name[namelen] = 0;
 764        return do_lstat(follow, alt_name, buf);
 765}
 766
 767static int get_file_info_by_handle(HANDLE hnd, struct stat *buf)
 768{
 769        BY_HANDLE_FILE_INFORMATION fdata;
 770
 771        if (!GetFileInformationByHandle(hnd, &fdata)) {
 772                errno = err_win_to_posix(GetLastError());
 773                return -1;
 774        }
 775
 776        buf->st_ino = 0;
 777        buf->st_gid = 0;
 778        buf->st_uid = 0;
 779        buf->st_nlink = 1;
 780        buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 781        buf->st_size = fdata.nFileSizeLow |
 782                (((off_t)fdata.nFileSizeHigh)<<32);
 783        buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 784        filetime_to_timespec(&(fdata.ftLastAccessTime), &(buf->st_atim));
 785        filetime_to_timespec(&(fdata.ftLastWriteTime), &(buf->st_mtim));
 786        filetime_to_timespec(&(fdata.ftCreationTime), &(buf->st_ctim));
 787        return 0;
 788}
 789
 790int mingw_lstat(const char *file_name, struct stat *buf)
 791{
 792        return do_stat_internal(0, file_name, buf);
 793}
 794int mingw_stat(const char *file_name, struct stat *buf)
 795{
 796        return do_stat_internal(1, file_name, buf);
 797}
 798
 799int mingw_fstat(int fd, struct stat *buf)
 800{
 801        HANDLE fh = (HANDLE)_get_osfhandle(fd);
 802        DWORD avail, type = GetFileType(fh) & ~FILE_TYPE_REMOTE;
 803
 804        switch (type) {
 805        case FILE_TYPE_DISK:
 806                return get_file_info_by_handle(fh, buf);
 807
 808        case FILE_TYPE_CHAR:
 809        case FILE_TYPE_PIPE:
 810                /* initialize stat fields */
 811                memset(buf, 0, sizeof(*buf));
 812                buf->st_nlink = 1;
 813
 814                if (type == FILE_TYPE_CHAR) {
 815                        buf->st_mode = _S_IFCHR;
 816                } else {
 817                        buf->st_mode = _S_IFIFO;
 818                        if (PeekNamedPipe(fh, NULL, 0, NULL, &avail, NULL))
 819                                buf->st_size = avail;
 820                }
 821                return 0;
 822
 823        default:
 824                errno = EBADF;
 825                return -1;
 826        }
 827}
 828
 829static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 830{
 831        long long winTime = t * 10000000LL + 116444736000000000LL;
 832        ft->dwLowDateTime = winTime;
 833        ft->dwHighDateTime = winTime >> 32;
 834}
 835
 836int mingw_utime (const char *file_name, const struct utimbuf *times)
 837{
 838        FILETIME mft, aft;
 839        int fh, rc;
 840        DWORD attrs;
 841        wchar_t wfilename[MAX_PATH];
 842        if (xutftowcs_path(wfilename, file_name) < 0)
 843                return -1;
 844
 845        /* must have write permission */
 846        attrs = GetFileAttributesW(wfilename);
 847        if (attrs != INVALID_FILE_ATTRIBUTES &&
 848            (attrs & FILE_ATTRIBUTE_READONLY)) {
 849                /* ignore errors here; open() will report them */
 850                SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
 851        }
 852
 853        if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
 854                rc = -1;
 855                goto revert_attrs;
 856        }
 857
 858        if (times) {
 859                time_t_to_filetime(times->modtime, &mft);
 860                time_t_to_filetime(times->actime, &aft);
 861        } else {
 862                GetSystemTimeAsFileTime(&mft);
 863                aft = mft;
 864        }
 865        if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 866                errno = EINVAL;
 867                rc = -1;
 868        } else
 869                rc = 0;
 870        close(fh);
 871
 872revert_attrs:
 873        if (attrs != INVALID_FILE_ATTRIBUTES &&
 874            (attrs & FILE_ATTRIBUTE_READONLY)) {
 875                /* ignore errors again */
 876                SetFileAttributesW(wfilename, attrs);
 877        }
 878        return rc;
 879}
 880
 881#undef strftime
 882size_t mingw_strftime(char *s, size_t max,
 883                      const char *format, const struct tm *tm)
 884{
 885        size_t ret = strftime(s, max, format, tm);
 886
 887        if (!ret && errno == EINVAL)
 888                die("invalid strftime format: '%s'", format);
 889        return ret;
 890}
 891
 892unsigned int sleep (unsigned int seconds)
 893{
 894        Sleep(seconds*1000);
 895        return 0;
 896}
 897
 898char *mingw_mktemp(char *template)
 899{
 900        wchar_t wtemplate[MAX_PATH];
 901        if (xutftowcs_path(wtemplate, template) < 0)
 902                return NULL;
 903        if (!_wmktemp(wtemplate))
 904                return NULL;
 905        if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
 906                return NULL;
 907        return template;
 908}
 909
 910int mkstemp(char *template)
 911{
 912        char *filename = mktemp(template);
 913        if (filename == NULL)
 914                return -1;
 915        return open(filename, O_RDWR | O_CREAT, 0600);
 916}
 917
 918int gettimeofday(struct timeval *tv, void *tz)
 919{
 920        FILETIME ft;
 921        long long hnsec;
 922
 923        GetSystemTimeAsFileTime(&ft);
 924        hnsec = filetime_to_hnsec(&ft);
 925        tv->tv_sec = hnsec / 10000000;
 926        tv->tv_usec = (hnsec % 10000000) / 10;
 927        return 0;
 928}
 929
 930int pipe(int filedes[2])
 931{
 932        HANDLE h[2];
 933
 934        /* this creates non-inheritable handles */
 935        if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 936                errno = err_win_to_posix(GetLastError());
 937                return -1;
 938        }
 939        filedes[0] = _open_osfhandle(HCAST(int, h[0]), O_NOINHERIT);
 940        if (filedes[0] < 0) {
 941                CloseHandle(h[0]);
 942                CloseHandle(h[1]);
 943                return -1;
 944        }
 945        filedes[1] = _open_osfhandle(HCAST(int, h[1]), O_NOINHERIT);
 946        if (filedes[1] < 0) {
 947                close(filedes[0]);
 948                CloseHandle(h[1]);
 949                return -1;
 950        }
 951        return 0;
 952}
 953
 954struct tm *gmtime_r(const time_t *timep, struct tm *result)
 955{
 956        /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 957        memcpy(result, gmtime(timep), sizeof(struct tm));
 958        return result;
 959}
 960
 961struct tm *localtime_r(const time_t *timep, struct tm *result)
 962{
 963        /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 964        memcpy(result, localtime(timep), sizeof(struct tm));
 965        return result;
 966}
 967
 968char *mingw_getcwd(char *pointer, int len)
 969{
 970        wchar_t cwd[MAX_PATH], wpointer[MAX_PATH];
 971        DWORD ret = GetCurrentDirectoryW(ARRAY_SIZE(cwd), cwd);
 972
 973        if (!ret || ret >= ARRAY_SIZE(cwd)) {
 974                errno = ret ? ENAMETOOLONG : err_win_to_posix(GetLastError());
 975                return NULL;
 976        }
 977        ret = GetLongPathNameW(cwd, wpointer, ARRAY_SIZE(wpointer));
 978        if (!ret && GetLastError() == ERROR_ACCESS_DENIED) {
 979                HANDLE hnd = CreateFileW(cwd, 0,
 980                        FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL,
 981                        OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
 982                if (hnd == INVALID_HANDLE_VALUE)
 983                        return NULL;
 984                ret = GetFinalPathNameByHandleW(hnd, wpointer, ARRAY_SIZE(wpointer), 0);
 985                CloseHandle(hnd);
 986                if (!ret || ret >= ARRAY_SIZE(wpointer))
 987                        return NULL;
 988                if (xwcstoutf(pointer, normalize_ntpath(wpointer), len) < 0)
 989                        return NULL;
 990                return pointer;
 991        }
 992        if (!ret || ret >= ARRAY_SIZE(wpointer))
 993                return NULL;
 994        if (xwcstoutf(pointer, wpointer, len) < 0)
 995                return NULL;
 996        convert_slashes(pointer);
 997        return pointer;
 998}
 999
1000/*
1001 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
1002 * (Parsing C++ Command-Line Arguments)
1003 */
1004static const char *quote_arg(const char *arg)
1005{
1006        /* count chars to quote */
1007        int len = 0, n = 0;
1008        int force_quotes = 0;
1009        char *q, *d;
1010        const char *p = arg;
1011        if (!*p) force_quotes = 1;
1012        while (*p) {
1013                if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
1014                        force_quotes = 1;
1015                else if (*p == '"')
1016                        n++;
1017                else if (*p == '\\') {
1018                        int count = 0;
1019                        while (*p == '\\') {
1020                                count++;
1021                                p++;
1022                                len++;
1023                        }
1024                        if (*p == '"')
1025                                n += count*2 + 1;
1026                        continue;
1027                }
1028                len++;
1029                p++;
1030        }
1031        if (!force_quotes && n == 0)
1032                return arg;
1033
1034        /* insert \ where necessary */
1035        d = q = xmalloc(st_add3(len, n, 3));
1036        *d++ = '"';
1037        while (*arg) {
1038                if (*arg == '"')
1039                        *d++ = '\\';
1040                else if (*arg == '\\') {
1041                        int count = 0;
1042                        while (*arg == '\\') {
1043                                count++;
1044                                *d++ = *arg++;
1045                        }
1046                        if (*arg == '"') {
1047                                while (count-- > 0)
1048                                        *d++ = '\\';
1049                                *d++ = '\\';
1050                        }
1051                }
1052                *d++ = *arg++;
1053        }
1054        *d++ = '"';
1055        *d++ = 0;
1056        return q;
1057}
1058
1059static const char *parse_interpreter(const char *cmd)
1060{
1061        static char buf[100];
1062        char *p, *opt;
1063        int n, fd;
1064
1065        /* don't even try a .exe */
1066        n = strlen(cmd);
1067        if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
1068                return NULL;
1069
1070        fd = open(cmd, O_RDONLY);
1071        if (fd < 0)
1072                return NULL;
1073        n = read(fd, buf, sizeof(buf)-1);
1074        close(fd);
1075        if (n < 4)      /* at least '#!/x' and not error */
1076                return NULL;
1077
1078        if (buf[0] != '#' || buf[1] != '!')
1079                return NULL;
1080        buf[n] = '\0';
1081        p = buf + strcspn(buf, "\r\n");
1082        if (!*p)
1083                return NULL;
1084
1085        *p = '\0';
1086        if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
1087                return NULL;
1088        /* strip options */
1089        if ((opt = strchr(p+1, ' ')))
1090                *opt = '\0';
1091        return p+1;
1092}
1093
1094/*
1095 * exe_only means that we only want to detect .exe files, but not scripts
1096 * (which do not have an extension)
1097 */
1098static char *lookup_prog(const char *dir, int dirlen, const char *cmd,
1099                         int isexe, int exe_only)
1100{
1101        char path[MAX_PATH];
1102        snprintf(path, sizeof(path), "%.*s\\%s.exe", dirlen, dir, cmd);
1103
1104        if (!isexe && access(path, F_OK) == 0)
1105                return xstrdup(path);
1106        path[strlen(path)-4] = '\0';
1107        if ((!exe_only || isexe) && access(path, F_OK) == 0)
1108                if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
1109                        return xstrdup(path);
1110        return NULL;
1111}
1112
1113/*
1114 * Determines the absolute path of cmd using the split path in path.
1115 * If cmd contains a slash or backslash, no lookup is performed.
1116 */
1117static char *path_lookup(const char *cmd, int exe_only)
1118{
1119        const char *path;
1120        char *prog = NULL;
1121        int len = strlen(cmd);
1122        int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
1123
1124        if (strchr(cmd, '/') || strchr(cmd, '\\'))
1125                return xstrdup(cmd);
1126
1127        path = mingw_getenv("PATH");
1128        if (!path)
1129                return NULL;
1130
1131        while (!prog) {
1132                const char *sep = strchrnul(path, ';');
1133                int dirlen = sep - path;
1134                if (dirlen)
1135                        prog = lookup_prog(path, dirlen, cmd, isexe, exe_only);
1136                if (!*sep)
1137                        break;
1138                path = sep + 1;
1139        }
1140
1141        return prog;
1142}
1143
1144static int do_putenv(char **env, const char *name, int size, int free_old);
1145
1146/* used number of elements of environ array, including terminating NULL */
1147static int environ_size = 0;
1148/* allocated size of environ array, in bytes */
1149static int environ_alloc = 0;
1150
1151/*
1152 * Create environment block suitable for CreateProcess. Merges current
1153 * process environment and the supplied environment changes.
1154 */
1155static wchar_t *make_environment_block(char **deltaenv)
1156{
1157        wchar_t *wenvblk = NULL;
1158        char **tmpenv;
1159        int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
1160
1161        while (deltaenv && deltaenv[i])
1162                i++;
1163
1164        /* copy the environment, leaving space for changes */
1165        ALLOC_ARRAY(tmpenv, size + i);
1166        memcpy(tmpenv, environ, size * sizeof(char*));
1167
1168        /* merge supplied environment changes into the temporary environment */
1169        for (i = 0; deltaenv && deltaenv[i]; i++)
1170                size = do_putenv(tmpenv, deltaenv[i], size, 0);
1171
1172        /* create environment block from temporary environment */
1173        for (i = 0; tmpenv[i]; i++) {
1174                size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
1175                ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
1176                wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
1177        }
1178        /* add final \0 terminator */
1179        wenvblk[wenvpos] = 0;
1180        free(tmpenv);
1181        return wenvblk;
1182}
1183
1184struct pinfo_t {
1185        struct pinfo_t *next;
1186        pid_t pid;
1187        HANDLE proc;
1188};
1189static struct pinfo_t *pinfo = NULL;
1190CRITICAL_SECTION pinfo_cs;
1191
1192static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1193                              const char *dir,
1194                              int prepend_cmd, int fhin, int fhout, int fherr)
1195{
1196        STARTUPINFOW si;
1197        PROCESS_INFORMATION pi;
1198        struct strbuf args;
1199        wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1200        unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1201        BOOL ret;
1202
1203        /* Determine whether or not we are associated to a console */
1204        HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
1205                        FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1206                        FILE_ATTRIBUTE_NORMAL, NULL);
1207        if (cons == INVALID_HANDLE_VALUE) {
1208                /* There is no console associated with this process.
1209                 * Since the child is a console process, Windows
1210                 * would normally create a console window. But
1211                 * since we'll be redirecting std streams, we do
1212                 * not need the console.
1213                 * It is necessary to use DETACHED_PROCESS
1214                 * instead of CREATE_NO_WINDOW to make ssh
1215                 * recognize that it has no console.
1216                 */
1217                flags |= DETACHED_PROCESS;
1218        } else {
1219                /* There is already a console. If we specified
1220                 * DETACHED_PROCESS here, too, Windows would
1221                 * disassociate the child from the console.
1222                 * The same is true for CREATE_NO_WINDOW.
1223                 * Go figure!
1224                 */
1225                CloseHandle(cons);
1226        }
1227        memset(&si, 0, sizeof(si));
1228        si.cb = sizeof(si);
1229        si.dwFlags = STARTF_USESTDHANDLES;
1230        si.hStdInput = winansi_get_osfhandle(fhin);
1231        si.hStdOutput = winansi_get_osfhandle(fhout);
1232        si.hStdError = winansi_get_osfhandle(fherr);
1233
1234        if (xutftowcs_path(wcmd, cmd) < 0)
1235                return -1;
1236        if (dir && xutftowcs_path(wdir, dir) < 0)
1237                return -1;
1238
1239        /* concatenate argv, quoting args as we go */
1240        strbuf_init(&args, 0);
1241        if (prepend_cmd) {
1242                char *quoted = (char *)quote_arg(cmd);
1243                strbuf_addstr(&args, quoted);
1244                if (quoted != cmd)
1245                        free(quoted);
1246        }
1247        for (; *argv; argv++) {
1248                char *quoted = (char *)quote_arg(*argv);
1249                if (*args.buf)
1250                        strbuf_addch(&args, ' ');
1251                strbuf_addstr(&args, quoted);
1252                if (quoted != *argv)
1253                        free(quoted);
1254        }
1255
1256        ALLOC_ARRAY(wargs, st_add(st_mult(2, args.len), 1));
1257        xutftowcs(wargs, args.buf, 2 * args.len + 1);
1258        strbuf_release(&args);
1259
1260        wenvblk = make_environment_block(deltaenv);
1261
1262        memset(&pi, 0, sizeof(pi));
1263        ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1264                wenvblk, dir ? wdir : NULL, &si, &pi);
1265
1266        free(wenvblk);
1267        free(wargs);
1268
1269        if (!ret) {
1270                errno = ENOENT;
1271                return -1;
1272        }
1273        CloseHandle(pi.hThread);
1274
1275        /*
1276         * The process ID is the human-readable identifier of the process
1277         * that we want to present in log and error messages. The handle
1278         * is not useful for this purpose. But we cannot close it, either,
1279         * because it is not possible to turn a process ID into a process
1280         * handle after the process terminated.
1281         * Keep the handle in a list for waitpid.
1282         */
1283        EnterCriticalSection(&pinfo_cs);
1284        {
1285                struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1286                info->pid = pi.dwProcessId;
1287                info->proc = pi.hProcess;
1288                info->next = pinfo;
1289                pinfo = info;
1290        }
1291        LeaveCriticalSection(&pinfo_cs);
1292
1293        return (pid_t)pi.dwProcessId;
1294}
1295
1296static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1297{
1298        return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1299}
1300
1301pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1302                     const char *dir,
1303                     int fhin, int fhout, int fherr)
1304{
1305        pid_t pid;
1306        char *prog = path_lookup(cmd, 0);
1307
1308        if (!prog) {
1309                errno = ENOENT;
1310                pid = -1;
1311        }
1312        else {
1313                const char *interpr = parse_interpreter(prog);
1314
1315                if (interpr) {
1316                        const char *argv0 = argv[0];
1317                        char *iprog = path_lookup(interpr, 1);
1318                        argv[0] = prog;
1319                        if (!iprog) {
1320                                errno = ENOENT;
1321                                pid = -1;
1322                        }
1323                        else {
1324                                pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1325                                                       fhin, fhout, fherr);
1326                                free(iprog);
1327                        }
1328                        argv[0] = argv0;
1329                }
1330                else
1331                        pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1332                                               fhin, fhout, fherr);
1333                free(prog);
1334        }
1335        return pid;
1336}
1337
1338static int try_shell_exec(const char *cmd, char *const *argv)
1339{
1340        const char *interpr = parse_interpreter(cmd);
1341        char *prog;
1342        int pid = 0;
1343
1344        if (!interpr)
1345                return 0;
1346        prog = path_lookup(interpr, 1);
1347        if (prog) {
1348                int argc = 0;
1349                const char **argv2;
1350                while (argv[argc]) argc++;
1351                ALLOC_ARRAY(argv2, argc + 1);
1352                argv2[0] = (char *)cmd; /* full path to the script file */
1353                memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1354                pid = mingw_spawnv(prog, argv2, 1);
1355                if (pid >= 0) {
1356                        int status;
1357                        if (waitpid(pid, &status, 0) < 0)
1358                                status = 255;
1359                        exit(status);
1360                }
1361                pid = 1;        /* indicate that we tried but failed */
1362                free(prog);
1363                free(argv2);
1364        }
1365        return pid;
1366}
1367
1368int mingw_execv(const char *cmd, char *const *argv)
1369{
1370        /* check if git_command is a shell script */
1371        if (!try_shell_exec(cmd, argv)) {
1372                int pid, status;
1373
1374                pid = mingw_spawnv(cmd, (const char **)argv, 0);
1375                if (pid < 0)
1376                        return -1;
1377                if (waitpid(pid, &status, 0) < 0)
1378                        status = 255;
1379                exit(status);
1380        }
1381        return -1;
1382}
1383
1384int mingw_execvp(const char *cmd, char *const *argv)
1385{
1386        char *prog = path_lookup(cmd, 0);
1387
1388        if (prog) {
1389                mingw_execv(prog, argv);
1390                free(prog);
1391        } else
1392                errno = ENOENT;
1393
1394        return -1;
1395}
1396
1397int mingw_kill(pid_t pid, int sig)
1398{
1399        if (pid > 0 && sig == SIGTERM) {
1400                HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1401
1402                if (TerminateProcess(h, -1)) {
1403                        CloseHandle(h);
1404                        return 0;
1405                }
1406
1407                errno = err_win_to_posix(GetLastError());
1408                CloseHandle(h);
1409                return -1;
1410        } else if (pid > 0 && sig == 0) {
1411                HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1412                if (h) {
1413                        CloseHandle(h);
1414                        return 0;
1415                }
1416        }
1417
1418        errno = EINVAL;
1419        return -1;
1420}
1421
1422/*
1423 * Compare environment entries by key (i.e. stopping at '=' or '\0').
1424 */
1425static int compareenv(const void *v1, const void *v2)
1426{
1427        const char *e1 = *(const char**)v1;
1428        const char *e2 = *(const char**)v2;
1429
1430        for (;;) {
1431                int c1 = *e1++;
1432                int c2 = *e2++;
1433                c1 = (c1 == '=') ? 0 : tolower(c1);
1434                c2 = (c2 == '=') ? 0 : tolower(c2);
1435                if (c1 > c2)
1436                        return 1;
1437                if (c1 < c2)
1438                        return -1;
1439                if (c1 == 0)
1440                        return 0;
1441        }
1442}
1443
1444static int bsearchenv(char **env, const char *name, size_t size)
1445{
1446        unsigned low = 0, high = size;
1447        while (low < high) {
1448                unsigned mid = low + ((high - low) >> 1);
1449                int cmp = compareenv(&env[mid], &name);
1450                if (cmp < 0)
1451                        low = mid + 1;
1452                else if (cmp > 0)
1453                        high = mid;
1454                else
1455                        return mid;
1456        }
1457        return ~low; /* not found, return 1's complement of insert position */
1458}
1459
1460/*
1461 * If name contains '=', then sets the variable, otherwise it unsets it
1462 * Size includes the terminating NULL. Env must have room for size + 1 entries
1463 * (in case of insert). Returns the new size. Optionally frees removed entries.
1464 */
1465static int do_putenv(char **env, const char *name, int size, int free_old)
1466{
1467        int i = bsearchenv(env, name, size - 1);
1468
1469        /* optionally free removed / replaced entry */
1470        if (i >= 0 && free_old)
1471                free(env[i]);
1472
1473        if (strchr(name, '=')) {
1474                /* if new value ('key=value') is specified, insert or replace entry */
1475                if (i < 0) {
1476                        i = ~i;
1477                        memmove(&env[i + 1], &env[i], (size - i) * sizeof(char*));
1478                        size++;
1479                }
1480                env[i] = (char*) name;
1481        } else if (i >= 0) {
1482                /* otherwise ('key') remove existing entry */
1483                size--;
1484                memmove(&env[i], &env[i + 1], (size - i) * sizeof(char*));
1485        }
1486        return size;
1487}
1488
1489char *mingw_getenv(const char *name)
1490{
1491        char *value;
1492        int pos = bsearchenv(environ, name, environ_size - 1);
1493        if (pos < 0)
1494                return NULL;
1495        value = strchr(environ[pos], '=');
1496        return value ? &value[1] : NULL;
1497}
1498
1499int mingw_putenv(const char *namevalue)
1500{
1501        ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
1502        environ_size = do_putenv(environ, namevalue, environ_size, 1);
1503        return 0;
1504}
1505
1506/*
1507 * Note, this isn't a complete replacement for getaddrinfo. It assumes
1508 * that service contains a numerical port, or that it is null. It
1509 * does a simple search using gethostbyname, and returns one IPv4 host
1510 * if one was found.
1511 */
1512static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1513                                   const struct addrinfo *hints,
1514                                   struct addrinfo **res)
1515{
1516        struct hostent *h = NULL;
1517        struct addrinfo *ai;
1518        struct sockaddr_in *sin;
1519
1520        if (node) {
1521                h = gethostbyname(node);
1522                if (!h)
1523                        return WSAGetLastError();
1524        }
1525
1526        ai = xmalloc(sizeof(struct addrinfo));
1527        *res = ai;
1528        ai->ai_flags = 0;
1529        ai->ai_family = AF_INET;
1530        ai->ai_socktype = hints ? hints->ai_socktype : 0;
1531        switch (ai->ai_socktype) {
1532        case SOCK_STREAM:
1533                ai->ai_protocol = IPPROTO_TCP;
1534                break;
1535        case SOCK_DGRAM:
1536                ai->ai_protocol = IPPROTO_UDP;
1537                break;
1538        default:
1539                ai->ai_protocol = 0;
1540                break;
1541        }
1542        ai->ai_addrlen = sizeof(struct sockaddr_in);
1543        if (hints && (hints->ai_flags & AI_CANONNAME))
1544                ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1545        else
1546                ai->ai_canonname = NULL;
1547
1548        sin = xcalloc(1, ai->ai_addrlen);
1549        sin->sin_family = AF_INET;
1550        /* Note: getaddrinfo is supposed to allow service to be a string,
1551         * which should be looked up using getservbyname. This is
1552         * currently not implemented */
1553        if (service)
1554                sin->sin_port = htons(atoi(service));
1555        if (h)
1556                sin->sin_addr = *(struct in_addr *)h->h_addr;
1557        else if (hints && (hints->ai_flags & AI_PASSIVE))
1558                sin->sin_addr.s_addr = INADDR_ANY;
1559        else
1560                sin->sin_addr.s_addr = INADDR_LOOPBACK;
1561        ai->ai_addr = (struct sockaddr *)sin;
1562        ai->ai_next = NULL;
1563        return 0;
1564}
1565
1566static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1567{
1568        free(res->ai_canonname);
1569        free(res->ai_addr);
1570        free(res);
1571}
1572
1573static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1574                                   char *host, DWORD hostlen,
1575                                   char *serv, DWORD servlen, int flags)
1576{
1577        const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1578        if (sa->sa_family != AF_INET)
1579                return EAI_FAMILY;
1580        if (!host && !serv)
1581                return EAI_NONAME;
1582
1583        if (host && hostlen > 0) {
1584                struct hostent *ent = NULL;
1585                if (!(flags & NI_NUMERICHOST))
1586                        ent = gethostbyaddr((const char *)&sin->sin_addr,
1587                                            sizeof(sin->sin_addr), AF_INET);
1588
1589                if (ent)
1590                        snprintf(host, hostlen, "%s", ent->h_name);
1591                else if (flags & NI_NAMEREQD)
1592                        return EAI_NONAME;
1593                else
1594                        snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1595        }
1596
1597        if (serv && servlen > 0) {
1598                struct servent *ent = NULL;
1599                if (!(flags & NI_NUMERICSERV))
1600                        ent = getservbyport(sin->sin_port,
1601                                            flags & NI_DGRAM ? "udp" : "tcp");
1602
1603                if (ent)
1604                        snprintf(serv, servlen, "%s", ent->s_name);
1605                else
1606                        snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1607        }
1608
1609        return 0;
1610}
1611
1612static HMODULE ipv6_dll = NULL;
1613static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1614static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1615                                      const struct addrinfo *hints,
1616                                      struct addrinfo **res);
1617static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1618                                      char *host, DWORD hostlen,
1619                                      char *serv, DWORD servlen, int flags);
1620/*
1621 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1622 * don't need to try to load that one dynamically.
1623 */
1624
1625static void socket_cleanup(void)
1626{
1627        WSACleanup();
1628        if (ipv6_dll)
1629                FreeLibrary(ipv6_dll);
1630        ipv6_dll = NULL;
1631        ipv6_freeaddrinfo = freeaddrinfo_stub;
1632        ipv6_getaddrinfo = getaddrinfo_stub;
1633        ipv6_getnameinfo = getnameinfo_stub;
1634}
1635
1636static void ensure_socket_initialization(void)
1637{
1638        WSADATA wsa;
1639        static int initialized = 0;
1640        const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1641        const char **name;
1642
1643        if (initialized)
1644                return;
1645
1646        if (WSAStartup(MAKEWORD(2,2), &wsa))
1647                die("unable to initialize winsock subsystem, error %d",
1648                        WSAGetLastError());
1649
1650        for (name = libraries; *name; name++) {
1651                ipv6_dll = LoadLibraryExA(*name, NULL,
1652                                          LOAD_LIBRARY_SEARCH_SYSTEM32);
1653                if (!ipv6_dll)
1654                        continue;
1655
1656                ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1657                        GetProcAddress(ipv6_dll, "freeaddrinfo");
1658                ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1659                                                   const struct addrinfo *,
1660                                                   struct addrinfo **))
1661                        GetProcAddress(ipv6_dll, "getaddrinfo");
1662                ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1663                                                   socklen_t, char *, DWORD,
1664                                                   char *, DWORD, int))
1665                        GetProcAddress(ipv6_dll, "getnameinfo");
1666                if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1667                        FreeLibrary(ipv6_dll);
1668                        ipv6_dll = NULL;
1669                } else
1670                        break;
1671        }
1672        if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1673                ipv6_freeaddrinfo = freeaddrinfo_stub;
1674                ipv6_getaddrinfo = getaddrinfo_stub;
1675                ipv6_getnameinfo = getnameinfo_stub;
1676        }
1677
1678        atexit(socket_cleanup);
1679        initialized = 1;
1680}
1681
1682#undef gethostname
1683int mingw_gethostname(char *name, int namelen)
1684{
1685    ensure_socket_initialization();
1686    return gethostname(name, namelen);
1687}
1688
1689#undef gethostbyname
1690struct hostent *mingw_gethostbyname(const char *host)
1691{
1692        ensure_socket_initialization();
1693        return gethostbyname(host);
1694}
1695
1696void mingw_freeaddrinfo(struct addrinfo *res)
1697{
1698        ipv6_freeaddrinfo(res);
1699}
1700
1701int mingw_getaddrinfo(const char *node, const char *service,
1702                      const struct addrinfo *hints, struct addrinfo **res)
1703{
1704        ensure_socket_initialization();
1705        return ipv6_getaddrinfo(node, service, hints, res);
1706}
1707
1708int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1709                      char *host, DWORD hostlen, char *serv, DWORD servlen,
1710                      int flags)
1711{
1712        ensure_socket_initialization();
1713        return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1714}
1715
1716int mingw_socket(int domain, int type, int protocol)
1717{
1718        int sockfd;
1719        SOCKET s;
1720
1721        ensure_socket_initialization();
1722        s = WSASocket(domain, type, protocol, NULL, 0, 0);
1723        if (s == INVALID_SOCKET) {
1724                /*
1725                 * WSAGetLastError() values are regular BSD error codes
1726                 * biased by WSABASEERR.
1727                 * However, strerror() does not know about networking
1728                 * specific errors, which are values beginning at 38 or so.
1729                 * Therefore, we choose to leave the biased error code
1730                 * in errno so that _if_ someone looks up the code somewhere,
1731                 * then it is at least the number that are usually listed.
1732                 */
1733                errno = WSAGetLastError();
1734                return -1;
1735        }
1736        /* convert into a file descriptor */
1737        if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1738                closesocket(s);
1739                return error("unable to make a socket file descriptor: %s",
1740                        strerror(errno));
1741        }
1742        return sockfd;
1743}
1744
1745#undef connect
1746int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1747{
1748        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1749        return connect(s, sa, sz);
1750}
1751
1752#undef bind
1753int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1754{
1755        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1756        return bind(s, sa, sz);
1757}
1758
1759#undef setsockopt
1760int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1761{
1762        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1763        return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1764}
1765
1766#undef shutdown
1767int mingw_shutdown(int sockfd, int how)
1768{
1769        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1770        return shutdown(s, how);
1771}
1772
1773#undef listen
1774int mingw_listen(int sockfd, int backlog)
1775{
1776        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1777        return listen(s, backlog);
1778}
1779
1780#undef accept
1781int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1782{
1783        int sockfd2;
1784
1785        SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1786        SOCKET s2 = accept(s1, sa, sz);
1787
1788        /* convert into a file descriptor */
1789        if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1790                int err = errno;
1791                closesocket(s2);
1792                return error("unable to make a socket file descriptor: %s",
1793                        strerror(err));
1794        }
1795        return sockfd2;
1796}
1797
1798#undef rename
1799int mingw_rename(const char *pold, const char *pnew)
1800{
1801        DWORD attrs, gle;
1802        int tries = 0;
1803        wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1804        if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1805                return -1;
1806
1807        /*
1808         * Try native rename() first to get errno right.
1809         * It is based on MoveFile(), which cannot overwrite existing files.
1810         */
1811        if (!_wrename(wpold, wpnew))
1812                return 0;
1813        if (errno != EEXIST)
1814                return -1;
1815repeat:
1816        if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1817                return 0;
1818        /* TODO: translate more errors */
1819        gle = GetLastError();
1820        if (gle == ERROR_ACCESS_DENIED &&
1821            (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1822                if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1823                        DWORD attrsold = GetFileAttributesW(wpold);
1824                        if (attrsold == INVALID_FILE_ATTRIBUTES ||
1825                            !(attrsold & FILE_ATTRIBUTE_DIRECTORY))
1826                                errno = EISDIR;
1827                        else if (!_wrmdir(wpnew))
1828                                goto repeat;
1829                        return -1;
1830                }
1831                if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1832                    SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1833                        if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1834                                return 0;
1835                        gle = GetLastError();
1836                        /* revert file attributes on failure */
1837                        SetFileAttributesW(wpnew, attrs);
1838                }
1839        }
1840        if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1841                /*
1842                 * We assume that some other process had the source or
1843                 * destination file open at the wrong moment and retry.
1844                 * In order to give the other process a higher chance to
1845                 * complete its operation, we give up our time slice now.
1846                 * If we have to retry again, we do sleep a bit.
1847                 */
1848                Sleep(delay[tries]);
1849                tries++;
1850                goto repeat;
1851        }
1852        if (gle == ERROR_ACCESS_DENIED &&
1853               ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1854                       "Should I try again?", pold, pnew))
1855                goto repeat;
1856
1857        errno = EACCES;
1858        return -1;
1859}
1860
1861/*
1862 * Note that this doesn't return the actual pagesize, but
1863 * the allocation granularity. If future Windows specific git code
1864 * needs the real getpagesize function, we need to find another solution.
1865 */
1866int mingw_getpagesize(void)
1867{
1868        SYSTEM_INFO si;
1869        GetSystemInfo(&si);
1870        return si.dwAllocationGranularity;
1871}
1872
1873/* See https://msdn.microsoft.com/en-us/library/windows/desktop/ms724435.aspx */
1874enum EXTENDED_NAME_FORMAT {
1875        NameDisplay = 3,
1876        NameUserPrincipal = 8
1877};
1878
1879static char *get_extended_user_info(enum EXTENDED_NAME_FORMAT type)
1880{
1881        DECLARE_PROC_ADDR(secur32.dll, BOOL, GetUserNameExW,
1882                enum EXTENDED_NAME_FORMAT, LPCWSTR, PULONG);
1883        static wchar_t wbuffer[1024];
1884        DWORD len;
1885
1886        if (!INIT_PROC_ADDR(GetUserNameExW))
1887                return NULL;
1888
1889        len = ARRAY_SIZE(wbuffer);
1890        if (GetUserNameExW(type, wbuffer, &len)) {
1891                char *converted = xmalloc((len *= 3));
1892                if (xwcstoutf(converted, wbuffer, len) >= 0)
1893                        return converted;
1894                free(converted);
1895        }
1896
1897        return NULL;
1898}
1899
1900char *mingw_query_user_email(void)
1901{
1902        return get_extended_user_info(NameUserPrincipal);
1903}
1904
1905struct passwd *getpwuid(int uid)
1906{
1907        static unsigned initialized;
1908        static char user_name[100];
1909        static struct passwd *p;
1910        DWORD len;
1911
1912        if (initialized)
1913                return p;
1914
1915        len = sizeof(user_name);
1916        if (!GetUserName(user_name, &len)) {
1917                initialized = 1;
1918                return NULL;
1919        }
1920
1921        p = xmalloc(sizeof(*p));
1922        p->pw_name = user_name;
1923        p->pw_gecos = get_extended_user_info(NameDisplay);
1924        if (!p->pw_gecos)
1925                p->pw_gecos = "unknown";
1926        p->pw_dir = NULL;
1927
1928        initialized = 1;
1929        return p;
1930}
1931
1932static HANDLE timer_event;
1933static HANDLE timer_thread;
1934static int timer_interval;
1935static int one_shot;
1936static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1937
1938/* The timer works like this:
1939 * The thread, ticktack(), is a trivial routine that most of the time
1940 * only waits to receive the signal to terminate. The main thread tells
1941 * the thread to terminate by setting the timer_event to the signalled
1942 * state.
1943 * But ticktack() interrupts the wait state after the timer's interval
1944 * length to call the signal handler.
1945 */
1946
1947static unsigned __stdcall ticktack(void *dummy)
1948{
1949        while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1950                mingw_raise(SIGALRM);
1951                if (one_shot)
1952                        break;
1953        }
1954        return 0;
1955}
1956
1957static int start_timer_thread(void)
1958{
1959        timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1960        if (timer_event) {
1961                timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1962                if (!timer_thread )
1963                        return errno = ENOMEM,
1964                                error("cannot start timer thread");
1965        } else
1966                return errno = ENOMEM,
1967                        error("cannot allocate resources for timer");
1968        return 0;
1969}
1970
1971static void stop_timer_thread(void)
1972{
1973        if (timer_event)
1974                SetEvent(timer_event);  /* tell thread to terminate */
1975        if (timer_thread) {
1976                int rc = WaitForSingleObject(timer_thread, 1000);
1977                if (rc == WAIT_TIMEOUT)
1978                        error("timer thread did not terminate timely");
1979                else if (rc != WAIT_OBJECT_0)
1980                        error("waiting for timer thread failed: %lu",
1981                              GetLastError());
1982                CloseHandle(timer_thread);
1983        }
1984        if (timer_event)
1985                CloseHandle(timer_event);
1986        timer_event = NULL;
1987        timer_thread = NULL;
1988}
1989
1990static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1991{
1992        return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1993}
1994
1995int setitimer(int type, struct itimerval *in, struct itimerval *out)
1996{
1997        static const struct timeval zero;
1998        static int atexit_done;
1999
2000        if (out != NULL)
2001                return errno = EINVAL,
2002                        error("setitimer param 3 != NULL not implemented");
2003        if (!is_timeval_eq(&in->it_interval, &zero) &&
2004            !is_timeval_eq(&in->it_interval, &in->it_value))
2005                return errno = EINVAL,
2006                        error("setitimer: it_interval must be zero or eq it_value");
2007
2008        if (timer_thread)
2009                stop_timer_thread();
2010
2011        if (is_timeval_eq(&in->it_value, &zero) &&
2012            is_timeval_eq(&in->it_interval, &zero))
2013                return 0;
2014
2015        timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
2016        one_shot = is_timeval_eq(&in->it_interval, &zero);
2017        if (!atexit_done) {
2018                atexit(stop_timer_thread);
2019                atexit_done = 1;
2020        }
2021        return start_timer_thread();
2022}
2023
2024int sigaction(int sig, struct sigaction *in, struct sigaction *out)
2025{
2026        if (sig != SIGALRM)
2027                return errno = EINVAL,
2028                        error("sigaction only implemented for SIGALRM");
2029        if (out != NULL)
2030                return errno = EINVAL,
2031                        error("sigaction: param 3 != NULL not implemented");
2032
2033        timer_fn = in->sa_handler;
2034        return 0;
2035}
2036
2037#undef signal
2038sig_handler_t mingw_signal(int sig, sig_handler_t handler)
2039{
2040        sig_handler_t old;
2041
2042        switch (sig) {
2043        case SIGALRM:
2044                old = timer_fn;
2045                timer_fn = handler;
2046                break;
2047
2048        case SIGINT:
2049                old = sigint_fn;
2050                sigint_fn = handler;
2051                break;
2052
2053        default:
2054                return signal(sig, handler);
2055        }
2056
2057        return old;
2058}
2059
2060#undef raise
2061int mingw_raise(int sig)
2062{
2063        switch (sig) {
2064        case SIGALRM:
2065                if (timer_fn == SIG_DFL) {
2066                        if (isatty(STDERR_FILENO))
2067                                fputs("Alarm clock\n", stderr);
2068                        exit(128 + SIGALRM);
2069                } else if (timer_fn != SIG_IGN)
2070                        timer_fn(SIGALRM);
2071                return 0;
2072
2073        case SIGINT:
2074                if (sigint_fn == SIG_DFL)
2075                        exit(128 + SIGINT);
2076                else if (sigint_fn != SIG_IGN)
2077                        sigint_fn(SIGINT);
2078                return 0;
2079
2080        default:
2081                return raise(sig);
2082        }
2083}
2084
2085int link(const char *oldpath, const char *newpath)
2086{
2087        typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
2088        static T create_hard_link = NULL;
2089        wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
2090        if (xutftowcs_path(woldpath, oldpath) < 0 ||
2091                xutftowcs_path(wnewpath, newpath) < 0)
2092                return -1;
2093
2094        if (!create_hard_link) {
2095                create_hard_link = (T) GetProcAddress(
2096                        GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
2097                if (!create_hard_link)
2098                        create_hard_link = (T)-1;
2099        }
2100        if (create_hard_link == (T)-1) {
2101                errno = ENOSYS;
2102                return -1;
2103        }
2104        if (!create_hard_link(wnewpath, woldpath, NULL)) {
2105                errno = err_win_to_posix(GetLastError());
2106                return -1;
2107        }
2108        return 0;
2109}
2110
2111pid_t waitpid(pid_t pid, int *status, int options)
2112{
2113        HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
2114            FALSE, pid);
2115        if (!h) {
2116                errno = ECHILD;
2117                return -1;
2118        }
2119
2120        if (pid > 0 && options & WNOHANG) {
2121                if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
2122                        CloseHandle(h);
2123                        return 0;
2124                }
2125                options &= ~WNOHANG;
2126        }
2127
2128        if (options == 0) {
2129                struct pinfo_t **ppinfo;
2130                if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
2131                        CloseHandle(h);
2132                        return 0;
2133                }
2134
2135                if (status)
2136                        GetExitCodeProcess(h, (LPDWORD)status);
2137
2138                EnterCriticalSection(&pinfo_cs);
2139
2140                ppinfo = &pinfo;
2141                while (*ppinfo) {
2142                        struct pinfo_t *info = *ppinfo;
2143                        if (info->pid == pid) {
2144                                CloseHandle(info->proc);
2145                                *ppinfo = info->next;
2146                                free(info);
2147                                break;
2148                        }
2149                        ppinfo = &info->next;
2150                }
2151
2152                LeaveCriticalSection(&pinfo_cs);
2153
2154                CloseHandle(h);
2155                return pid;
2156        }
2157        CloseHandle(h);
2158
2159        errno = EINVAL;
2160        return -1;
2161}
2162
2163int mingw_skip_dos_drive_prefix(char **path)
2164{
2165        int ret = has_dos_drive_prefix(*path);
2166        *path += ret;
2167        return ret;
2168}
2169
2170int mingw_offset_1st_component(const char *path)
2171{
2172        char *pos = (char *)path;
2173
2174        /* unc paths */
2175        if (!skip_dos_drive_prefix(&pos) &&
2176                        is_dir_sep(pos[0]) && is_dir_sep(pos[1])) {
2177                /* skip server name */
2178                pos = strpbrk(pos + 2, "\\/");
2179                if (!pos)
2180                        return 0; /* Error: malformed unc path */
2181
2182                do {
2183                        pos++;
2184                } while (*pos && !is_dir_sep(*pos));
2185        }
2186
2187        return pos + is_dir_sep(*pos) - path;
2188}
2189
2190int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
2191{
2192        int upos = 0, wpos = 0;
2193        const unsigned char *utf = (const unsigned char*) utfs;
2194        if (!utf || !wcs || wcslen < 1) {
2195                errno = EINVAL;
2196                return -1;
2197        }
2198        /* reserve space for \0 */
2199        wcslen--;
2200        if (utflen < 0)
2201                utflen = INT_MAX;
2202
2203        while (upos < utflen) {
2204                int c = utf[upos++] & 0xff;
2205                if (utflen == INT_MAX && c == 0)
2206                        break;
2207
2208                if (wpos >= wcslen) {
2209                        wcs[wpos] = 0;
2210                        errno = ERANGE;
2211                        return -1;
2212                }
2213
2214                if (c < 0x80) {
2215                        /* ASCII */
2216                        wcs[wpos++] = c;
2217                } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2218                                (utf[upos] & 0xc0) == 0x80) {
2219                        /* 2-byte utf-8 */
2220                        c = ((c & 0x1f) << 6);
2221                        c |= (utf[upos++] & 0x3f);
2222                        wcs[wpos++] = c;
2223                } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2224                                !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2225                                (utf[upos] & 0xc0) == 0x80 &&
2226                                (utf[upos + 1] & 0xc0) == 0x80) {
2227                        /* 3-byte utf-8 */
2228                        c = ((c & 0x0f) << 12);
2229                        c |= ((utf[upos++] & 0x3f) << 6);
2230                        c |= (utf[upos++] & 0x3f);
2231                        wcs[wpos++] = c;
2232                } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2233                                wpos + 1 < wcslen &&
2234                                !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2235                                !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2236                                (utf[upos] & 0xc0) == 0x80 &&
2237                                (utf[upos + 1] & 0xc0) == 0x80 &&
2238                                (utf[upos + 2] & 0xc0) == 0x80) {
2239                        /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2240                        c = ((c & 0x07) << 18);
2241                        c |= ((utf[upos++] & 0x3f) << 12);
2242                        c |= ((utf[upos++] & 0x3f) << 6);
2243                        c |= (utf[upos++] & 0x3f);
2244                        c -= 0x10000;
2245                        wcs[wpos++] = 0xd800 | (c >> 10);
2246                        wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2247                } else if (c >= 0xa0) {
2248                        /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2249                        wcs[wpos++] = c;
2250                } else {
2251                        /* invalid utf-8 byte, non-printable unicode: convert to hex */
2252                        static const char *hex = "0123456789abcdef";
2253                        wcs[wpos++] = hex[c >> 4];
2254                        if (wpos < wcslen)
2255                                wcs[wpos++] = hex[c & 0x0f];
2256                }
2257        }
2258        wcs[wpos] = 0;
2259        return wpos;
2260}
2261
2262int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2263{
2264        if (!wcs || !utf || utflen < 1) {
2265                errno = EINVAL;
2266                return -1;
2267        }
2268        utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2269        if (utflen)
2270                return utflen - 1;
2271        errno = ERANGE;
2272        return -1;
2273}
2274
2275static void setup_windows_environment(void)
2276{
2277        char *tmp = getenv("TMPDIR");
2278
2279        /* on Windows it is TMP and TEMP */
2280        if (!tmp) {
2281                if (!(tmp = getenv("TMP")))
2282                        tmp = getenv("TEMP");
2283                if (tmp) {
2284                        setenv("TMPDIR", tmp, 1);
2285                        tmp = getenv("TMPDIR");
2286                }
2287        }
2288
2289        if (tmp) {
2290                /*
2291                 * Convert all dir separators to forward slashes,
2292                 * to help shell commands called from the Git
2293                 * executable (by not mistaking the dir separators
2294                 * for escape characters).
2295                 */
2296                convert_slashes(tmp);
2297        }
2298
2299        /* simulate TERM to enable auto-color (see color.c) */
2300        if (!getenv("TERM"))
2301                setenv("TERM", "cygwin", 1);
2302}
2303
2304/*
2305 * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2306 * mingw startup code, see init.c in mingw runtime).
2307 */
2308int _CRT_glob = 0;
2309
2310typedef struct {
2311        int newmode;
2312} _startupinfo;
2313
2314extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2315                _startupinfo *si);
2316
2317static NORETURN void die_startup(void)
2318{
2319        fputs("fatal: not enough memory for initialization", stderr);
2320        exit(128);
2321}
2322
2323static void *malloc_startup(size_t size)
2324{
2325        void *result = malloc(size);
2326        if (!result)
2327                die_startup();
2328        return result;
2329}
2330
2331static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2332{
2333        len = xwcstoutf(buffer, wcs, len) + 1;
2334        return memcpy(malloc_startup(len), buffer, len);
2335}
2336
2337static void maybe_redirect_std_handle(const wchar_t *key, DWORD std_id, int fd,
2338                                      DWORD desired_access, DWORD flags)
2339{
2340        DWORD create_flag = fd ? OPEN_ALWAYS : OPEN_EXISTING;
2341        wchar_t buf[MAX_PATH];
2342        DWORD max = ARRAY_SIZE(buf);
2343        HANDLE handle;
2344        DWORD ret = GetEnvironmentVariableW(key, buf, max);
2345
2346        if (!ret || ret >= max)
2347                return;
2348
2349        /* make sure this does not leak into child processes */
2350        SetEnvironmentVariableW(key, NULL);
2351        if (!wcscmp(buf, L"off")) {
2352                close(fd);
2353                handle = GetStdHandle(std_id);
2354                if (handle != INVALID_HANDLE_VALUE)
2355                        CloseHandle(handle);
2356                return;
2357        }
2358        if (std_id == STD_ERROR_HANDLE && !wcscmp(buf, L"2>&1")) {
2359                handle = GetStdHandle(STD_OUTPUT_HANDLE);
2360                if (handle == INVALID_HANDLE_VALUE) {
2361                        close(fd);
2362                        handle = GetStdHandle(std_id);
2363                        if (handle != INVALID_HANDLE_VALUE)
2364                                CloseHandle(handle);
2365                } else {
2366                        int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2367                        SetStdHandle(std_id, handle);
2368                        dup2(new_fd, fd);
2369                        /* do *not* close the new_fd: that would close stdout */
2370                }
2371                return;
2372        }
2373        handle = CreateFileW(buf, desired_access, 0, NULL, create_flag,
2374                             flags, NULL);
2375        if (handle != INVALID_HANDLE_VALUE) {
2376                int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2377                SetStdHandle(std_id, handle);
2378                dup2(new_fd, fd);
2379                close(new_fd);
2380        }
2381}
2382
2383static void maybe_redirect_std_handles(void)
2384{
2385        maybe_redirect_std_handle(L"GIT_REDIRECT_STDIN", STD_INPUT_HANDLE, 0,
2386                                  GENERIC_READ, FILE_ATTRIBUTE_NORMAL);
2387        maybe_redirect_std_handle(L"GIT_REDIRECT_STDOUT", STD_OUTPUT_HANDLE, 1,
2388                                  GENERIC_WRITE, FILE_ATTRIBUTE_NORMAL);
2389        maybe_redirect_std_handle(L"GIT_REDIRECT_STDERR", STD_ERROR_HANDLE, 2,
2390                                  GENERIC_WRITE, FILE_FLAG_NO_BUFFERING);
2391}
2392
2393void mingw_startup(void)
2394{
2395        int i, maxlen, argc;
2396        char *buffer;
2397        wchar_t **wenv, **wargv;
2398        _startupinfo si;
2399
2400        maybe_redirect_std_handles();
2401
2402        /* get wide char arguments and environment */
2403        si.newmode = 0;
2404        if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2405                die_startup();
2406
2407        /* determine size of argv and environ conversion buffer */
2408        maxlen = wcslen(wargv[0]);
2409        for (i = 1; i < argc; i++)
2410                maxlen = max(maxlen, wcslen(wargv[i]));
2411        for (i = 0; wenv[i]; i++)
2412                maxlen = max(maxlen, wcslen(wenv[i]));
2413
2414        /*
2415         * nedmalloc can't free CRT memory, allocate resizable environment
2416         * list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
2417         * use it while initializing the environment itself.
2418         */
2419        environ_size = i + 1;
2420        environ_alloc = alloc_nr(environ_size * sizeof(char*));
2421        environ = malloc_startup(environ_alloc);
2422
2423        /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2424        maxlen = 3 * maxlen + 1;
2425        buffer = malloc_startup(maxlen);
2426
2427        /* convert command line arguments and environment to UTF-8 */
2428        for (i = 0; i < argc; i++)
2429                __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2430        for (i = 0; wenv[i]; i++)
2431                environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
2432        environ[i] = NULL;
2433        free(buffer);
2434
2435        /* sort environment for O(log n) getenv / putenv */
2436        qsort(environ, i, sizeof(char*), compareenv);
2437
2438        /* fix Windows specific environment settings */
2439        setup_windows_environment();
2440
2441        /* initialize critical section for waitpid pinfo_t list */
2442        InitializeCriticalSection(&pinfo_cs);
2443
2444        /* set up default file mode and file modes for stdin/out/err */
2445        _fmode = _O_BINARY;
2446        _setmode(_fileno(stdin), _O_BINARY);
2447        _setmode(_fileno(stdout), _O_BINARY);
2448        _setmode(_fileno(stderr), _O_BINARY);
2449
2450        /* initialize Unicode console */
2451        winansi_init();
2452}
2453
2454int uname(struct utsname *buf)
2455{
2456        unsigned v = (unsigned)GetVersion();
2457        memset(buf, 0, sizeof(*buf));
2458        xsnprintf(buf->sysname, sizeof(buf->sysname), "Windows");
2459        xsnprintf(buf->release, sizeof(buf->release),
2460                 "%u.%u", v & 0xff, (v >> 8) & 0xff);
2461        /* assuming NT variants only.. */
2462        xsnprintf(buf->version, sizeof(buf->version),
2463                  "%u", (v >> 16) & 0x7fff);
2464        return 0;
2465}