compat / mingw.con commit Merge branch 'rs/grep-no-recursive' (9822b8f)
   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
   9#define HCAST(type, handle) ((type)(intptr_t)handle)
  10
  11static const int delay[] = { 0, 1, 10, 20, 40 };
  12
  13int err_win_to_posix(DWORD winerr)
  14{
  15        int error = ENOSYS;
  16        switch(winerr) {
  17        case ERROR_ACCESS_DENIED: error = EACCES; break;
  18        case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  19        case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  20        case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  21        case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  22        case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  23        case ERROR_BAD_COMMAND: error = EIO; break;
  24        case ERROR_BAD_DEVICE: error = ENODEV; break;
  25        case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  26        case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  27        case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  28        case ERROR_BAD_LENGTH: error = EINVAL; break;
  29        case ERROR_BAD_PATHNAME: error = ENOENT; break;
  30        case ERROR_BAD_PIPE: error = EPIPE; break;
  31        case ERROR_BAD_UNIT: error = ENODEV; break;
  32        case ERROR_BAD_USERNAME: error = EINVAL; break;
  33        case ERROR_BROKEN_PIPE: error = EPIPE; break;
  34        case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  35        case ERROR_BUSY: error = EBUSY; break;
  36        case ERROR_BUSY_DRIVE: error = EBUSY; break;
  37        case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  38        case ERROR_CANNOT_MAKE: error = EACCES; break;
  39        case ERROR_CANTOPEN: error = EIO; break;
  40        case ERROR_CANTREAD: error = EIO; break;
  41        case ERROR_CANTWRITE: error = EIO; break;
  42        case ERROR_CRC: error = EIO; break;
  43        case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  44        case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  45        case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  46        case ERROR_DIRECTORY: error = EINVAL; break;
  47        case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  48        case ERROR_DISK_CHANGE: error = EIO; break;
  49        case ERROR_DISK_FULL: error = ENOSPC; break;
  50        case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  51        case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  52        case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  53        case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  54        case ERROR_FILE_EXISTS: error = EEXIST; break;
  55        case ERROR_FILE_INVALID: error = ENODEV; break;
  56        case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  57        case ERROR_GEN_FAILURE: error = EIO; break;
  58        case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  59        case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  60        case ERROR_INVALID_ACCESS: error = EACCES; break;
  61        case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  62        case ERROR_INVALID_BLOCK: error = EFAULT; break;
  63        case ERROR_INVALID_DATA: error = EINVAL; break;
  64        case ERROR_INVALID_DRIVE: error = ENODEV; break;
  65        case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  66        case ERROR_INVALID_FLAGS: error = EINVAL; break;
  67        case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  68        case ERROR_INVALID_HANDLE: error = EBADF; break;
  69        case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  70        case ERROR_INVALID_NAME: error = EINVAL; break;
  71        case ERROR_INVALID_OWNER: error = EINVAL; break;
  72        case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  73        case ERROR_INVALID_PASSWORD: error = EPERM; break;
  74        case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  75        case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  76        case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  77        case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  78        case ERROR_IO_DEVICE: error = EIO; break;
  79        case ERROR_IO_INCOMPLETE: error = EINTR; break;
  80        case ERROR_LOCKED: error = EBUSY; break;
  81        case ERROR_LOCK_VIOLATION: error = EACCES; break;
  82        case ERROR_LOGON_FAILURE: error = EACCES; break;
  83        case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  84        case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  85        case ERROR_MORE_DATA: error = EPIPE; break;
  86        case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  87        case ERROR_NOACCESS: error = EFAULT; break;
  88        case ERROR_NONE_MAPPED: error = EINVAL; break;
  89        case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  90        case ERROR_NOT_READY: error = EAGAIN; break;
  91        case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  92        case ERROR_NO_DATA: error = EPIPE; break;
  93        case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  94        case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  95        case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  96        case ERROR_OPEN_FAILED: error = EIO; break;
  97        case ERROR_OPEN_FILES: error = EBUSY; break;
  98        case ERROR_OPERATION_ABORTED: error = EINTR; break;
  99        case ERROR_OUTOFMEMORY: error = ENOMEM; break;
 100        case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
 101        case ERROR_PATH_BUSY: error = EBUSY; break;
 102        case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
 103        case ERROR_PIPE_BUSY: error = EBUSY; break;
 104        case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 105        case ERROR_PIPE_LISTENING: error = EPIPE; break;
 106        case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 107        case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 108        case ERROR_READ_FAULT: error = EIO; break;
 109        case ERROR_SEEK: error = EIO; break;
 110        case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 111        case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 112        case ERROR_SHARING_VIOLATION: error = EACCES; break;
 113        case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 114        case ERROR_SWAPERROR: error = ENOENT; break;
 115        case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 116        case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 117        case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 118        case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 119        case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 120        case ERROR_WRITE_FAULT: error = EIO; break;
 121        case ERROR_WRITE_PROTECT: error = EROFS; break;
 122        }
 123        return error;
 124}
 125
 126static inline int is_file_in_use_error(DWORD errcode)
 127{
 128        switch (errcode) {
 129        case ERROR_SHARING_VIOLATION:
 130        case ERROR_ACCESS_DENIED:
 131                return 1;
 132        }
 133
 134        return 0;
 135}
 136
 137static int read_yes_no_answer(void)
 138{
 139        char answer[1024];
 140
 141        if (fgets(answer, sizeof(answer), stdin)) {
 142                size_t answer_len = strlen(answer);
 143                int got_full_line = 0, c;
 144
 145                /* remove the newline */
 146                if (answer_len >= 2 && answer[answer_len-2] == '\r') {
 147                        answer[answer_len-2] = '\0';
 148                        got_full_line = 1;
 149                } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
 150                        answer[answer_len-1] = '\0';
 151                        got_full_line = 1;
 152                }
 153                /* flush the buffer in case we did not get the full line */
 154                if (!got_full_line)
 155                        while ((c = getchar()) != EOF && c != '\n')
 156                                ;
 157        } else
 158                /* we could not read, return the
 159                 * default answer which is no */
 160                return 0;
 161
 162        if (tolower(answer[0]) == 'y' && !answer[1])
 163                return 1;
 164        if (!strncasecmp(answer, "yes", sizeof(answer)))
 165                return 1;
 166        if (tolower(answer[0]) == 'n' && !answer[1])
 167                return 0;
 168        if (!strncasecmp(answer, "no", sizeof(answer)))
 169                return 0;
 170
 171        /* did not find an answer we understand */
 172        return -1;
 173}
 174
 175static int ask_yes_no_if_possible(const char *format, ...)
 176{
 177        char question[4096];
 178        const char *retry_hook[] = { NULL, NULL, NULL };
 179        va_list args;
 180
 181        va_start(args, format);
 182        vsnprintf(question, sizeof(question), format, args);
 183        va_end(args);
 184
 185        if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) {
 186                retry_hook[1] = question;
 187                return !run_command_v_opt(retry_hook, 0);
 188        }
 189
 190        if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
 191                return 0;
 192
 193        while (1) {
 194                int answer;
 195                fprintf(stderr, "%s (y/n) ", question);
 196
 197                if ((answer = read_yes_no_answer()) >= 0)
 198                        return answer;
 199
 200                fprintf(stderr, "Sorry, I did not understand your answer. "
 201                                "Please type 'y' or 'n'\n");
 202        }
 203}
 204
 205int mingw_unlink(const char *pathname)
 206{
 207        int ret, tries = 0;
 208        wchar_t wpathname[MAX_PATH];
 209        if (xutftowcs_path(wpathname, pathname) < 0)
 210                return -1;
 211
 212        /* read-only files cannot be removed */
 213        _wchmod(wpathname, 0666);
 214        while ((ret = _wunlink(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 215                if (!is_file_in_use_error(GetLastError()))
 216                        break;
 217                /*
 218                 * We assume that some other process had the source or
 219                 * destination file open at the wrong moment and retry.
 220                 * In order to give the other process a higher chance to
 221                 * complete its operation, we give up our time slice now.
 222                 * If we have to retry again, we do sleep a bit.
 223                 */
 224                Sleep(delay[tries]);
 225                tries++;
 226        }
 227        while (ret == -1 && is_file_in_use_error(GetLastError()) &&
 228               ask_yes_no_if_possible("Unlink of file '%s' failed. "
 229                        "Should I try again?", pathname))
 230               ret = _wunlink(wpathname);
 231        return ret;
 232}
 233
 234static int is_dir_empty(const wchar_t *wpath)
 235{
 236        WIN32_FIND_DATAW findbuf;
 237        HANDLE handle;
 238        wchar_t wbuf[MAX_PATH + 2];
 239        wcscpy(wbuf, wpath);
 240        wcscat(wbuf, L"\\*");
 241        handle = FindFirstFileW(wbuf, &findbuf);
 242        if (handle == INVALID_HANDLE_VALUE)
 243                return GetLastError() == ERROR_NO_MORE_FILES;
 244
 245        while (!wcscmp(findbuf.cFileName, L".") ||
 246                        !wcscmp(findbuf.cFileName, L".."))
 247                if (!FindNextFileW(handle, &findbuf)) {
 248                        DWORD err = GetLastError();
 249                        FindClose(handle);
 250                        return err == ERROR_NO_MORE_FILES;
 251                }
 252        FindClose(handle);
 253        return 0;
 254}
 255
 256int mingw_rmdir(const char *pathname)
 257{
 258        int ret, tries = 0;
 259        wchar_t wpathname[MAX_PATH];
 260        if (xutftowcs_path(wpathname, pathname) < 0)
 261                return -1;
 262
 263        while ((ret = _wrmdir(wpathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 264                if (!is_file_in_use_error(GetLastError()))
 265                        errno = err_win_to_posix(GetLastError());
 266                if (errno != EACCES)
 267                        break;
 268                if (!is_dir_empty(wpathname)) {
 269                        errno = ENOTEMPTY;
 270                        break;
 271                }
 272                /*
 273                 * We assume that some other process had the source or
 274                 * destination file open at the wrong moment and retry.
 275                 * In order to give the other process a higher chance to
 276                 * complete its operation, we give up our time slice now.
 277                 * If we have to retry again, we do sleep a bit.
 278                 */
 279                Sleep(delay[tries]);
 280                tries++;
 281        }
 282        while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
 283               ask_yes_no_if_possible("Deletion of directory '%s' failed. "
 284                        "Should I try again?", pathname))
 285               ret = _wrmdir(wpathname);
 286        return ret;
 287}
 288
 289static inline int needs_hiding(const char *path)
 290{
 291        const char *basename;
 292
 293        if (hide_dotfiles == HIDE_DOTFILES_FALSE)
 294                return 0;
 295
 296        /* We cannot use basename(), as it would remove trailing slashes */
 297        mingw_skip_dos_drive_prefix((char **)&path);
 298        if (!*path)
 299                return 0;
 300
 301        for (basename = path; *path; path++)
 302                if (is_dir_sep(*path)) {
 303                        do {
 304                                path++;
 305                        } while (is_dir_sep(*path));
 306                        /* ignore trailing slashes */
 307                        if (*path)
 308                                basename = path;
 309                }
 310
 311        if (hide_dotfiles == HIDE_DOTFILES_TRUE)
 312                return *basename == '.';
 313
 314        assert(hide_dotfiles == HIDE_DOTFILES_DOTGITONLY);
 315        return !strncasecmp(".git", basename, 4) &&
 316                (!basename[4] || is_dir_sep(basename[4]));
 317}
 318
 319static int set_hidden_flag(const wchar_t *path, int set)
 320{
 321        DWORD original = GetFileAttributesW(path), modified;
 322        if (set)
 323                modified = original | FILE_ATTRIBUTE_HIDDEN;
 324        else
 325                modified = original & ~FILE_ATTRIBUTE_HIDDEN;
 326        if (original == modified || SetFileAttributesW(path, modified))
 327                return 0;
 328        errno = err_win_to_posix(GetLastError());
 329        return -1;
 330}
 331
 332int mingw_mkdir(const char *path, int mode)
 333{
 334        int ret;
 335        wchar_t wpath[MAX_PATH];
 336        if (xutftowcs_path(wpath, path) < 0)
 337                return -1;
 338        ret = _wmkdir(wpath);
 339        if (!ret && needs_hiding(path))
 340                return set_hidden_flag(wpath, 1);
 341        return ret;
 342}
 343
 344/*
 345 * Calling CreateFile() using FILE_APPEND_DATA and without FILE_WRITE_DATA
 346 * is documented in [1] as opening a writable file handle in append mode.
 347 * (It is believed that) this is atomic since it is maintained by the
 348 * kernel unlike the O_APPEND flag which is racily maintained by the CRT.
 349 *
 350 * [1] https://docs.microsoft.com/en-us/windows/desktop/fileio/file-access-rights-constants
 351 *
 352 * This trick does not appear to work for named pipes.  Instead it creates
 353 * a named pipe client handle that cannot be written to.  Callers should
 354 * just use the regular _wopen() for them.  (And since client handle gets
 355 * bound to a unique server handle, it isn't really an issue.)
 356 */
 357static int mingw_open_append(wchar_t const *wfilename, int oflags, ...)
 358{
 359        HANDLE handle;
 360        int fd;
 361        DWORD create = (oflags & O_CREAT) ? OPEN_ALWAYS : OPEN_EXISTING;
 362
 363        /* only these flags are supported */
 364        if ((oflags & ~O_CREAT) != (O_WRONLY | O_APPEND))
 365                return errno = ENOSYS, -1;
 366
 367        /*
 368         * FILE_SHARE_WRITE is required to permit child processes
 369         * to append to the file.
 370         */
 371        handle = CreateFileW(wfilename, FILE_APPEND_DATA,
 372                        FILE_SHARE_WRITE | FILE_SHARE_READ,
 373                        NULL, create, FILE_ATTRIBUTE_NORMAL, NULL);
 374        if (handle == INVALID_HANDLE_VALUE)
 375                return errno = err_win_to_posix(GetLastError()), -1;
 376
 377        /*
 378         * No O_APPEND here, because the CRT uses it only to reset the
 379         * file pointer to EOF before each write(); but that is not
 380         * necessary (and may lead to races) for a file created with
 381         * FILE_APPEND_DATA.
 382         */
 383        fd = _open_osfhandle((intptr_t)handle, O_BINARY);
 384        if (fd < 0)
 385                CloseHandle(handle);
 386        return fd;
 387}
 388
 389/*
 390 * Does the pathname map to the local named pipe filesystem?
 391 * That is, does it have a "//./pipe/" prefix?
 392 */
 393static int is_local_named_pipe_path(const char *filename)
 394{
 395        return (is_dir_sep(filename[0]) &&
 396                is_dir_sep(filename[1]) &&
 397                filename[2] == '.'  &&
 398                is_dir_sep(filename[3]) &&
 399                !strncasecmp(filename+4, "pipe", 4) &&
 400                is_dir_sep(filename[8]) &&
 401                filename[9]);
 402}
 403
 404int mingw_open (const char *filename, int oflags, ...)
 405{
 406        typedef int (*open_fn_t)(wchar_t const *wfilename, int oflags, ...);
 407        va_list args;
 408        unsigned mode;
 409        int fd;
 410        wchar_t wfilename[MAX_PATH];
 411        open_fn_t open_fn;
 412
 413        va_start(args, oflags);
 414        mode = va_arg(args, int);
 415        va_end(args);
 416
 417        if (filename && !strcmp(filename, "/dev/null"))
 418                filename = "nul";
 419
 420        if ((oflags & O_APPEND) && !is_local_named_pipe_path(filename))
 421                open_fn = mingw_open_append;
 422        else
 423                open_fn = _wopen;
 424
 425        if (xutftowcs_path(wfilename, filename) < 0)
 426                return -1;
 427        fd = open_fn(wfilename, oflags, mode);
 428
 429        if (fd < 0 && (oflags & O_ACCMODE) != O_RDONLY && errno == EACCES) {
 430                DWORD attrs = GetFileAttributesW(wfilename);
 431                if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 432                        errno = EISDIR;
 433        }
 434        if ((oflags & O_CREAT) && needs_hiding(filename)) {
 435                /*
 436                 * Internally, _wopen() uses the CreateFile() API which errors
 437                 * out with an ERROR_ACCESS_DENIED if CREATE_ALWAYS was
 438                 * specified and an already existing file's attributes do not
 439                 * match *exactly*. As there is no mode or flag we can set that
 440                 * would correspond to FILE_ATTRIBUTE_HIDDEN, let's just try
 441                 * again *without* the O_CREAT flag (that corresponds to the
 442                 * CREATE_ALWAYS flag of CreateFile()).
 443                 */
 444                if (fd < 0 && errno == EACCES)
 445                        fd = open_fn(wfilename, oflags & ~O_CREAT, mode);
 446                if (fd >= 0 && set_hidden_flag(wfilename, 1))
 447                        warning("could not mark '%s' as hidden.", filename);
 448        }
 449        return fd;
 450}
 451
 452static BOOL WINAPI ctrl_ignore(DWORD type)
 453{
 454        return TRUE;
 455}
 456
 457#undef fgetc
 458int mingw_fgetc(FILE *stream)
 459{
 460        int ch;
 461        if (!isatty(_fileno(stream)))
 462                return fgetc(stream);
 463
 464        SetConsoleCtrlHandler(ctrl_ignore, TRUE);
 465        while (1) {
 466                ch = fgetc(stream);
 467                if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
 468                        break;
 469
 470                /* Ctrl+C was pressed, simulate SIGINT and retry */
 471                mingw_raise(SIGINT);
 472        }
 473        SetConsoleCtrlHandler(ctrl_ignore, FALSE);
 474        return ch;
 475}
 476
 477#undef fopen
 478FILE *mingw_fopen (const char *filename, const char *otype)
 479{
 480        int hide = needs_hiding(filename);
 481        FILE *file;
 482        wchar_t wfilename[MAX_PATH], wotype[4];
 483        if (filename && !strcmp(filename, "/dev/null"))
 484                filename = "nul";
 485        if (xutftowcs_path(wfilename, filename) < 0 ||
 486                xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 487                return NULL;
 488        if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
 489                error("could not unhide %s", filename);
 490                return NULL;
 491        }
 492        file = _wfopen(wfilename, wotype);
 493        if (!file && GetLastError() == ERROR_INVALID_NAME)
 494                errno = ENOENT;
 495        if (file && hide && set_hidden_flag(wfilename, 1))
 496                warning("could not mark '%s' as hidden.", filename);
 497        return file;
 498}
 499
 500FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 501{
 502        int hide = needs_hiding(filename);
 503        FILE *file;
 504        wchar_t wfilename[MAX_PATH], wotype[4];
 505        if (filename && !strcmp(filename, "/dev/null"))
 506                filename = "nul";
 507        if (xutftowcs_path(wfilename, filename) < 0 ||
 508                xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 509                return NULL;
 510        if (hide && !access(filename, F_OK) && set_hidden_flag(wfilename, 0)) {
 511                error("could not unhide %s", filename);
 512                return NULL;
 513        }
 514        file = _wfreopen(wfilename, wotype, stream);
 515        if (file && hide && set_hidden_flag(wfilename, 1))
 516                warning("could not mark '%s' as hidden.", filename);
 517        return file;
 518}
 519
 520#undef fflush
 521int mingw_fflush(FILE *stream)
 522{
 523        int ret = fflush(stream);
 524
 525        /*
 526         * write() is used behind the scenes of stdio output functions.
 527         * Since git code does not check for errors after each stdio write
 528         * operation, it can happen that write() is called by a later
 529         * stdio function even if an earlier write() call failed. In the
 530         * case of a pipe whose readable end was closed, only the first
 531         * call to write() reports EPIPE on Windows. Subsequent write()
 532         * calls report EINVAL. It is impossible to notice whether this
 533         * fflush invocation triggered such a case, therefore, we have to
 534         * catch all EINVAL errors whole-sale.
 535         */
 536        if (ret && errno == EINVAL)
 537                errno = EPIPE;
 538
 539        return ret;
 540}
 541
 542#undef write
 543ssize_t mingw_write(int fd, const void *buf, size_t len)
 544{
 545        ssize_t result = write(fd, buf, len);
 546
 547        if (result < 0 && errno == EINVAL && buf) {
 548                /* check if fd is a pipe */
 549                HANDLE h = (HANDLE) _get_osfhandle(fd);
 550                if (GetFileType(h) == FILE_TYPE_PIPE)
 551                        errno = EPIPE;
 552                else
 553                        errno = EINVAL;
 554        }
 555
 556        return result;
 557}
 558
 559int mingw_access(const char *filename, int mode)
 560{
 561        wchar_t wfilename[MAX_PATH];
 562        if (xutftowcs_path(wfilename, filename) < 0)
 563                return -1;
 564        /* X_OK is not supported by the MSVCRT version */
 565        return _waccess(wfilename, mode & ~X_OK);
 566}
 567
 568int mingw_chdir(const char *dirname)
 569{
 570        wchar_t wdirname[MAX_PATH];
 571        if (xutftowcs_path(wdirname, dirname) < 0)
 572                return -1;
 573        return _wchdir(wdirname);
 574}
 575
 576int mingw_chmod(const char *filename, int mode)
 577{
 578        wchar_t wfilename[MAX_PATH];
 579        if (xutftowcs_path(wfilename, filename) < 0)
 580                return -1;
 581        return _wchmod(wfilename, mode);
 582}
 583
 584/*
 585 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 586 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 587 */
 588static inline long long filetime_to_hnsec(const FILETIME *ft)
 589{
 590        long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 591        /* Windows to Unix Epoch conversion */
 592        return winTime - 116444736000000000LL;
 593}
 594
 595static inline time_t filetime_to_time_t(const FILETIME *ft)
 596{
 597        return (time_t)(filetime_to_hnsec(ft) / 10000000);
 598}
 599
 600/**
 601 * Verifies that safe_create_leading_directories() would succeed.
 602 */
 603static int has_valid_directory_prefix(wchar_t *wfilename)
 604{
 605        int n = wcslen(wfilename);
 606
 607        while (n > 0) {
 608                wchar_t c = wfilename[--n];
 609                DWORD attributes;
 610
 611                if (!is_dir_sep(c))
 612                        continue;
 613
 614                wfilename[n] = L'\0';
 615                attributes = GetFileAttributesW(wfilename);
 616                wfilename[n] = c;
 617                if (attributes == FILE_ATTRIBUTE_DIRECTORY ||
 618                                attributes == FILE_ATTRIBUTE_DEVICE)
 619                        return 1;
 620                if (attributes == INVALID_FILE_ATTRIBUTES)
 621                        switch (GetLastError()) {
 622                        case ERROR_PATH_NOT_FOUND:
 623                                continue;
 624                        case ERROR_FILE_NOT_FOUND:
 625                                /* This implies parent directory exists. */
 626                                return 1;
 627                        }
 628                return 0;
 629        }
 630        return 1;
 631}
 632
 633/* We keep the do_lstat code in a separate function to avoid recursion.
 634 * When a path ends with a slash, the stat will fail with ENOENT. In
 635 * this case, we strip the trailing slashes and stat again.
 636 *
 637 * If follow is true then act like stat() and report on the link
 638 * target. Otherwise report on the link itself.
 639 */
 640static int do_lstat(int follow, const char *file_name, struct stat *buf)
 641{
 642        WIN32_FILE_ATTRIBUTE_DATA fdata;
 643        wchar_t wfilename[MAX_PATH];
 644        if (xutftowcs_path(wfilename, file_name) < 0)
 645                return -1;
 646
 647        if (GetFileAttributesExW(wfilename, GetFileExInfoStandard, &fdata)) {
 648                buf->st_ino = 0;
 649                buf->st_gid = 0;
 650                buf->st_uid = 0;
 651                buf->st_nlink = 1;
 652                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 653                buf->st_size = fdata.nFileSizeLow |
 654                        (((off_t)fdata.nFileSizeHigh)<<32);
 655                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 656                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 657                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 658                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 659                if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 660                        WIN32_FIND_DATAW findbuf;
 661                        HANDLE handle = FindFirstFileW(wfilename, &findbuf);
 662                        if (handle != INVALID_HANDLE_VALUE) {
 663                                if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 664                                                (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 665                                        if (follow) {
 666                                                char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 667                                                buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 668                                        } else {
 669                                                buf->st_mode = S_IFLNK;
 670                                        }
 671                                        buf->st_mode |= S_IREAD;
 672                                        if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 673                                                buf->st_mode |= S_IWRITE;
 674                                }
 675                                FindClose(handle);
 676                        }
 677                }
 678                return 0;
 679        }
 680        switch (GetLastError()) {
 681        case ERROR_ACCESS_DENIED:
 682        case ERROR_SHARING_VIOLATION:
 683        case ERROR_LOCK_VIOLATION:
 684        case ERROR_SHARING_BUFFER_EXCEEDED:
 685                errno = EACCES;
 686                break;
 687        case ERROR_BUFFER_OVERFLOW:
 688                errno = ENAMETOOLONG;
 689                break;
 690        case ERROR_NOT_ENOUGH_MEMORY:
 691                errno = ENOMEM;
 692                break;
 693        case ERROR_PATH_NOT_FOUND:
 694                if (!has_valid_directory_prefix(wfilename)) {
 695                        errno = ENOTDIR;
 696                        break;
 697                }
 698                /* fallthru */
 699        default:
 700                errno = ENOENT;
 701                break;
 702        }
 703        return -1;
 704}
 705
 706/* We provide our own lstat/fstat functions, since the provided
 707 * lstat/fstat functions are so slow. These stat functions are
 708 * tailored for Git's usage (read: fast), and are not meant to be
 709 * complete. Note that Git stat()s are redirected to mingw_lstat()
 710 * too, since Windows doesn't really handle symlinks that well.
 711 */
 712static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 713{
 714        int namelen;
 715        char alt_name[PATH_MAX];
 716
 717        if (!do_lstat(follow, file_name, buf))
 718                return 0;
 719
 720        /* if file_name ended in a '/', Windows returned ENOENT;
 721         * try again without trailing slashes
 722         */
 723        if (errno != ENOENT)
 724                return -1;
 725
 726        namelen = strlen(file_name);
 727        if (namelen && file_name[namelen-1] != '/')
 728                return -1;
 729        while (namelen && file_name[namelen-1] == '/')
 730                --namelen;
 731        if (!namelen || namelen >= PATH_MAX)
 732                return -1;
 733
 734        memcpy(alt_name, file_name, namelen);
 735        alt_name[namelen] = 0;
 736        return do_lstat(follow, alt_name, buf);
 737}
 738
 739int mingw_lstat(const char *file_name, struct stat *buf)
 740{
 741        return do_stat_internal(0, file_name, buf);
 742}
 743int mingw_stat(const char *file_name, struct stat *buf)
 744{
 745        return do_stat_internal(1, file_name, buf);
 746}
 747
 748int mingw_fstat(int fd, struct stat *buf)
 749{
 750        HANDLE fh = (HANDLE)_get_osfhandle(fd);
 751        BY_HANDLE_FILE_INFORMATION fdata;
 752
 753        if (fh == INVALID_HANDLE_VALUE) {
 754                errno = EBADF;
 755                return -1;
 756        }
 757        /* direct non-file handles to MS's fstat() */
 758        if (GetFileType(fh) != FILE_TYPE_DISK)
 759                return _fstati64(fd, buf);
 760
 761        if (GetFileInformationByHandle(fh, &fdata)) {
 762                buf->st_ino = 0;
 763                buf->st_gid = 0;
 764                buf->st_uid = 0;
 765                buf->st_nlink = 1;
 766                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 767                buf->st_size = fdata.nFileSizeLow |
 768                        (((off_t)fdata.nFileSizeHigh)<<32);
 769                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 770                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 771                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 772                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 773                return 0;
 774        }
 775        errno = EBADF;
 776        return -1;
 777}
 778
 779static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 780{
 781        long long winTime = t * 10000000LL + 116444736000000000LL;
 782        ft->dwLowDateTime = winTime;
 783        ft->dwHighDateTime = winTime >> 32;
 784}
 785
 786int mingw_utime (const char *file_name, const struct utimbuf *times)
 787{
 788        FILETIME mft, aft;
 789        int fh, rc;
 790        DWORD attrs;
 791        wchar_t wfilename[MAX_PATH];
 792        if (xutftowcs_path(wfilename, file_name) < 0)
 793                return -1;
 794
 795        /* must have write permission */
 796        attrs = GetFileAttributesW(wfilename);
 797        if (attrs != INVALID_FILE_ATTRIBUTES &&
 798            (attrs & FILE_ATTRIBUTE_READONLY)) {
 799                /* ignore errors here; open() will report them */
 800                SetFileAttributesW(wfilename, attrs & ~FILE_ATTRIBUTE_READONLY);
 801        }
 802
 803        if ((fh = _wopen(wfilename, O_RDWR | O_BINARY)) < 0) {
 804                rc = -1;
 805                goto revert_attrs;
 806        }
 807
 808        if (times) {
 809                time_t_to_filetime(times->modtime, &mft);
 810                time_t_to_filetime(times->actime, &aft);
 811        } else {
 812                GetSystemTimeAsFileTime(&mft);
 813                aft = mft;
 814        }
 815        if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 816                errno = EINVAL;
 817                rc = -1;
 818        } else
 819                rc = 0;
 820        close(fh);
 821
 822revert_attrs:
 823        if (attrs != INVALID_FILE_ATTRIBUTES &&
 824            (attrs & FILE_ATTRIBUTE_READONLY)) {
 825                /* ignore errors again */
 826                SetFileAttributesW(wfilename, attrs);
 827        }
 828        return rc;
 829}
 830
 831#undef strftime
 832size_t mingw_strftime(char *s, size_t max,
 833                      const char *format, const struct tm *tm)
 834{
 835        size_t ret = strftime(s, max, format, tm);
 836
 837        if (!ret && errno == EINVAL)
 838                die("invalid strftime format: '%s'", format);
 839        return ret;
 840}
 841
 842unsigned int sleep (unsigned int seconds)
 843{
 844        Sleep(seconds*1000);
 845        return 0;
 846}
 847
 848char *mingw_mktemp(char *template)
 849{
 850        wchar_t wtemplate[MAX_PATH];
 851        if (xutftowcs_path(wtemplate, template) < 0)
 852                return NULL;
 853        if (!_wmktemp(wtemplate))
 854                return NULL;
 855        if (xwcstoutf(template, wtemplate, strlen(template) + 1) < 0)
 856                return NULL;
 857        return template;
 858}
 859
 860int mkstemp(char *template)
 861{
 862        char *filename = mktemp(template);
 863        if (filename == NULL)
 864                return -1;
 865        return open(filename, O_RDWR | O_CREAT, 0600);
 866}
 867
 868int gettimeofday(struct timeval *tv, void *tz)
 869{
 870        FILETIME ft;
 871        long long hnsec;
 872
 873        GetSystemTimeAsFileTime(&ft);
 874        hnsec = filetime_to_hnsec(&ft);
 875        tv->tv_sec = hnsec / 10000000;
 876        tv->tv_usec = (hnsec % 10000000) / 10;
 877        return 0;
 878}
 879
 880int pipe(int filedes[2])
 881{
 882        HANDLE h[2];
 883
 884        /* this creates non-inheritable handles */
 885        if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 886                errno = err_win_to_posix(GetLastError());
 887                return -1;
 888        }
 889        filedes[0] = _open_osfhandle(HCAST(int, h[0]), O_NOINHERIT);
 890        if (filedes[0] < 0) {
 891                CloseHandle(h[0]);
 892                CloseHandle(h[1]);
 893                return -1;
 894        }
 895        filedes[1] = _open_osfhandle(HCAST(int, h[1]), O_NOINHERIT);
 896        if (filedes[1] < 0) {
 897                close(filedes[0]);
 898                CloseHandle(h[1]);
 899                return -1;
 900        }
 901        return 0;
 902}
 903
 904struct tm *gmtime_r(const time_t *timep, struct tm *result)
 905{
 906        /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 907        memcpy(result, gmtime(timep), sizeof(struct tm));
 908        return result;
 909}
 910
 911struct tm *localtime_r(const time_t *timep, struct tm *result)
 912{
 913        /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 914        memcpy(result, localtime(timep), sizeof(struct tm));
 915        return result;
 916}
 917
 918char *mingw_getcwd(char *pointer, int len)
 919{
 920        wchar_t wpointer[MAX_PATH];
 921        if (!_wgetcwd(wpointer, ARRAY_SIZE(wpointer)))
 922                return NULL;
 923        if (xwcstoutf(pointer, wpointer, len) < 0)
 924                return NULL;
 925        convert_slashes(pointer);
 926        return pointer;
 927}
 928
 929/*
 930 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 931 * (Parsing C++ Command-Line Arguments)
 932 */
 933static const char *quote_arg(const char *arg)
 934{
 935        /* count chars to quote */
 936        int len = 0, n = 0;
 937        int force_quotes = 0;
 938        char *q, *d;
 939        const char *p = arg;
 940        if (!*p) force_quotes = 1;
 941        while (*p) {
 942                if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 943                        force_quotes = 1;
 944                else if (*p == '"')
 945                        n++;
 946                else if (*p == '\\') {
 947                        int count = 0;
 948                        while (*p == '\\') {
 949                                count++;
 950                                p++;
 951                                len++;
 952                        }
 953                        if (*p == '"')
 954                                n += count*2 + 1;
 955                        continue;
 956                }
 957                len++;
 958                p++;
 959        }
 960        if (!force_quotes && n == 0)
 961                return arg;
 962
 963        /* insert \ where necessary */
 964        d = q = xmalloc(st_add3(len, n, 3));
 965        *d++ = '"';
 966        while (*arg) {
 967                if (*arg == '"')
 968                        *d++ = '\\';
 969                else if (*arg == '\\') {
 970                        int count = 0;
 971                        while (*arg == '\\') {
 972                                count++;
 973                                *d++ = *arg++;
 974                        }
 975                        if (*arg == '"') {
 976                                while (count-- > 0)
 977                                        *d++ = '\\';
 978                                *d++ = '\\';
 979                        }
 980                }
 981                *d++ = *arg++;
 982        }
 983        *d++ = '"';
 984        *d++ = 0;
 985        return q;
 986}
 987
 988static const char *parse_interpreter(const char *cmd)
 989{
 990        static char buf[100];
 991        char *p, *opt;
 992        int n, fd;
 993
 994        /* don't even try a .exe */
 995        n = strlen(cmd);
 996        if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 997                return NULL;
 998
 999        fd = open(cmd, O_RDONLY);
1000        if (fd < 0)
1001                return NULL;
1002        n = read(fd, buf, sizeof(buf)-1);
1003        close(fd);
1004        if (n < 4)      /* at least '#!/x' and not error */
1005                return NULL;
1006
1007        if (buf[0] != '#' || buf[1] != '!')
1008                return NULL;
1009        buf[n] = '\0';
1010        p = buf + strcspn(buf, "\r\n");
1011        if (!*p)
1012                return NULL;
1013
1014        *p = '\0';
1015        if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
1016                return NULL;
1017        /* strip options */
1018        if ((opt = strchr(p+1, ' ')))
1019                *opt = '\0';
1020        return p+1;
1021}
1022
1023/*
1024 * exe_only means that we only want to detect .exe files, but not scripts
1025 * (which do not have an extension)
1026 */
1027static char *lookup_prog(const char *dir, int dirlen, const char *cmd,
1028                         int isexe, int exe_only)
1029{
1030        char path[MAX_PATH];
1031        snprintf(path, sizeof(path), "%.*s\\%s.exe", dirlen, dir, cmd);
1032
1033        if (!isexe && access(path, F_OK) == 0)
1034                return xstrdup(path);
1035        path[strlen(path)-4] = '\0';
1036        if ((!exe_only || isexe) && access(path, F_OK) == 0)
1037                if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
1038                        return xstrdup(path);
1039        return NULL;
1040}
1041
1042/*
1043 * Determines the absolute path of cmd using the split path in path.
1044 * If cmd contains a slash or backslash, no lookup is performed.
1045 */
1046static char *path_lookup(const char *cmd, int exe_only)
1047{
1048        const char *path;
1049        char *prog = NULL;
1050        int len = strlen(cmd);
1051        int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
1052
1053        if (strchr(cmd, '/') || strchr(cmd, '\\'))
1054                return xstrdup(cmd);
1055
1056        path = mingw_getenv("PATH");
1057        if (!path)
1058                return NULL;
1059
1060        while (!prog) {
1061                const char *sep = strchrnul(path, ';');
1062                int dirlen = sep - path;
1063                if (dirlen)
1064                        prog = lookup_prog(path, dirlen, cmd, isexe, exe_only);
1065                if (!*sep)
1066                        break;
1067                path = sep + 1;
1068        }
1069
1070        return prog;
1071}
1072
1073static int do_putenv(char **env, const char *name, int size, int free_old);
1074
1075/* used number of elements of environ array, including terminating NULL */
1076static int environ_size = 0;
1077/* allocated size of environ array, in bytes */
1078static int environ_alloc = 0;
1079
1080/*
1081 * Create environment block suitable for CreateProcess. Merges current
1082 * process environment and the supplied environment changes.
1083 */
1084static wchar_t *make_environment_block(char **deltaenv)
1085{
1086        wchar_t *wenvblk = NULL;
1087        char **tmpenv;
1088        int i = 0, size = environ_size, wenvsz = 0, wenvpos = 0;
1089
1090        while (deltaenv && deltaenv[i])
1091                i++;
1092
1093        /* copy the environment, leaving space for changes */
1094        ALLOC_ARRAY(tmpenv, size + i);
1095        memcpy(tmpenv, environ, size * sizeof(char*));
1096
1097        /* merge supplied environment changes into the temporary environment */
1098        for (i = 0; deltaenv && deltaenv[i]; i++)
1099                size = do_putenv(tmpenv, deltaenv[i], size, 0);
1100
1101        /* create environment block from temporary environment */
1102        for (i = 0; tmpenv[i]; i++) {
1103                size = 2 * strlen(tmpenv[i]) + 2; /* +2 for final \0 */
1104                ALLOC_GROW(wenvblk, (wenvpos + size) * sizeof(wchar_t), wenvsz);
1105                wenvpos += xutftowcs(&wenvblk[wenvpos], tmpenv[i], size) + 1;
1106        }
1107        /* add final \0 terminator */
1108        wenvblk[wenvpos] = 0;
1109        free(tmpenv);
1110        return wenvblk;
1111}
1112
1113struct pinfo_t {
1114        struct pinfo_t *next;
1115        pid_t pid;
1116        HANDLE proc;
1117};
1118static struct pinfo_t *pinfo = NULL;
1119CRITICAL_SECTION pinfo_cs;
1120
1121static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **deltaenv,
1122                              const char *dir,
1123                              int prepend_cmd, int fhin, int fhout, int fherr)
1124{
1125        STARTUPINFOW si;
1126        PROCESS_INFORMATION pi;
1127        struct strbuf args;
1128        wchar_t wcmd[MAX_PATH], wdir[MAX_PATH], *wargs, *wenvblk = NULL;
1129        unsigned flags = CREATE_UNICODE_ENVIRONMENT;
1130        BOOL ret;
1131
1132        /* Determine whether or not we are associated to a console */
1133        HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
1134                        FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
1135                        FILE_ATTRIBUTE_NORMAL, NULL);
1136        if (cons == INVALID_HANDLE_VALUE) {
1137                /* There is no console associated with this process.
1138                 * Since the child is a console process, Windows
1139                 * would normally create a console window. But
1140                 * since we'll be redirecting std streams, we do
1141                 * not need the console.
1142                 * It is necessary to use DETACHED_PROCESS
1143                 * instead of CREATE_NO_WINDOW to make ssh
1144                 * recognize that it has no console.
1145                 */
1146                flags |= DETACHED_PROCESS;
1147        } else {
1148                /* There is already a console. If we specified
1149                 * DETACHED_PROCESS here, too, Windows would
1150                 * disassociate the child from the console.
1151                 * The same is true for CREATE_NO_WINDOW.
1152                 * Go figure!
1153                 */
1154                CloseHandle(cons);
1155        }
1156        memset(&si, 0, sizeof(si));
1157        si.cb = sizeof(si);
1158        si.dwFlags = STARTF_USESTDHANDLES;
1159        si.hStdInput = winansi_get_osfhandle(fhin);
1160        si.hStdOutput = winansi_get_osfhandle(fhout);
1161        si.hStdError = winansi_get_osfhandle(fherr);
1162
1163        if (xutftowcs_path(wcmd, cmd) < 0)
1164                return -1;
1165        if (dir && xutftowcs_path(wdir, dir) < 0)
1166                return -1;
1167
1168        /* concatenate argv, quoting args as we go */
1169        strbuf_init(&args, 0);
1170        if (prepend_cmd) {
1171                char *quoted = (char *)quote_arg(cmd);
1172                strbuf_addstr(&args, quoted);
1173                if (quoted != cmd)
1174                        free(quoted);
1175        }
1176        for (; *argv; argv++) {
1177                char *quoted = (char *)quote_arg(*argv);
1178                if (*args.buf)
1179                        strbuf_addch(&args, ' ');
1180                strbuf_addstr(&args, quoted);
1181                if (quoted != *argv)
1182                        free(quoted);
1183        }
1184
1185        ALLOC_ARRAY(wargs, st_add(st_mult(2, args.len), 1));
1186        xutftowcs(wargs, args.buf, 2 * args.len + 1);
1187        strbuf_release(&args);
1188
1189        wenvblk = make_environment_block(deltaenv);
1190
1191        memset(&pi, 0, sizeof(pi));
1192        ret = CreateProcessW(wcmd, wargs, NULL, NULL, TRUE, flags,
1193                wenvblk, dir ? wdir : NULL, &si, &pi);
1194
1195        free(wenvblk);
1196        free(wargs);
1197
1198        if (!ret) {
1199                errno = ENOENT;
1200                return -1;
1201        }
1202        CloseHandle(pi.hThread);
1203
1204        /*
1205         * The process ID is the human-readable identifier of the process
1206         * that we want to present in log and error messages. The handle
1207         * is not useful for this purpose. But we cannot close it, either,
1208         * because it is not possible to turn a process ID into a process
1209         * handle after the process terminated.
1210         * Keep the handle in a list for waitpid.
1211         */
1212        EnterCriticalSection(&pinfo_cs);
1213        {
1214                struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1215                info->pid = pi.dwProcessId;
1216                info->proc = pi.hProcess;
1217                info->next = pinfo;
1218                pinfo = info;
1219        }
1220        LeaveCriticalSection(&pinfo_cs);
1221
1222        return (pid_t)pi.dwProcessId;
1223}
1224
1225static pid_t mingw_spawnv(const char *cmd, const char **argv, int prepend_cmd)
1226{
1227        return mingw_spawnve_fd(cmd, argv, NULL, NULL, prepend_cmd, 0, 1, 2);
1228}
1229
1230pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **deltaenv,
1231                     const char *dir,
1232                     int fhin, int fhout, int fherr)
1233{
1234        pid_t pid;
1235        char *prog = path_lookup(cmd, 0);
1236
1237        if (!prog) {
1238                errno = ENOENT;
1239                pid = -1;
1240        }
1241        else {
1242                const char *interpr = parse_interpreter(prog);
1243
1244                if (interpr) {
1245                        const char *argv0 = argv[0];
1246                        char *iprog = path_lookup(interpr, 1);
1247                        argv[0] = prog;
1248                        if (!iprog) {
1249                                errno = ENOENT;
1250                                pid = -1;
1251                        }
1252                        else {
1253                                pid = mingw_spawnve_fd(iprog, argv, deltaenv, dir, 1,
1254                                                       fhin, fhout, fherr);
1255                                free(iprog);
1256                        }
1257                        argv[0] = argv0;
1258                }
1259                else
1260                        pid = mingw_spawnve_fd(prog, argv, deltaenv, dir, 0,
1261                                               fhin, fhout, fherr);
1262                free(prog);
1263        }
1264        return pid;
1265}
1266
1267static int try_shell_exec(const char *cmd, char *const *argv)
1268{
1269        const char *interpr = parse_interpreter(cmd);
1270        char *prog;
1271        int pid = 0;
1272
1273        if (!interpr)
1274                return 0;
1275        prog = path_lookup(interpr, 1);
1276        if (prog) {
1277                int argc = 0;
1278                const char **argv2;
1279                while (argv[argc]) argc++;
1280                ALLOC_ARRAY(argv2, argc + 1);
1281                argv2[0] = (char *)cmd; /* full path to the script file */
1282                memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1283                pid = mingw_spawnv(prog, argv2, 1);
1284                if (pid >= 0) {
1285                        int status;
1286                        if (waitpid(pid, &status, 0) < 0)
1287                                status = 255;
1288                        exit(status);
1289                }
1290                pid = 1;        /* indicate that we tried but failed */
1291                free(prog);
1292                free(argv2);
1293        }
1294        return pid;
1295}
1296
1297int mingw_execv(const char *cmd, char *const *argv)
1298{
1299        /* check if git_command is a shell script */
1300        if (!try_shell_exec(cmd, argv)) {
1301                int pid, status;
1302
1303                pid = mingw_spawnv(cmd, (const char **)argv, 0);
1304                if (pid < 0)
1305                        return -1;
1306                if (waitpid(pid, &status, 0) < 0)
1307                        status = 255;
1308                exit(status);
1309        }
1310        return -1;
1311}
1312
1313int mingw_execvp(const char *cmd, char *const *argv)
1314{
1315        char *prog = path_lookup(cmd, 0);
1316
1317        if (prog) {
1318                mingw_execv(prog, argv);
1319                free(prog);
1320        } else
1321                errno = ENOENT;
1322
1323        return -1;
1324}
1325
1326int mingw_kill(pid_t pid, int sig)
1327{
1328        if (pid > 0 && sig == SIGTERM) {
1329                HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1330
1331                if (TerminateProcess(h, -1)) {
1332                        CloseHandle(h);
1333                        return 0;
1334                }
1335
1336                errno = err_win_to_posix(GetLastError());
1337                CloseHandle(h);
1338                return -1;
1339        } else if (pid > 0 && sig == 0) {
1340                HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1341                if (h) {
1342                        CloseHandle(h);
1343                        return 0;
1344                }
1345        }
1346
1347        errno = EINVAL;
1348        return -1;
1349}
1350
1351/*
1352 * Compare environment entries by key (i.e. stopping at '=' or '\0').
1353 */
1354static int compareenv(const void *v1, const void *v2)
1355{
1356        const char *e1 = *(const char**)v1;
1357        const char *e2 = *(const char**)v2;
1358
1359        for (;;) {
1360                int c1 = *e1++;
1361                int c2 = *e2++;
1362                c1 = (c1 == '=') ? 0 : tolower(c1);
1363                c2 = (c2 == '=') ? 0 : tolower(c2);
1364                if (c1 > c2)
1365                        return 1;
1366                if (c1 < c2)
1367                        return -1;
1368                if (c1 == 0)
1369                        return 0;
1370        }
1371}
1372
1373static int bsearchenv(char **env, const char *name, size_t size)
1374{
1375        unsigned low = 0, high = size;
1376        while (low < high) {
1377                unsigned mid = low + ((high - low) >> 1);
1378                int cmp = compareenv(&env[mid], &name);
1379                if (cmp < 0)
1380                        low = mid + 1;
1381                else if (cmp > 0)
1382                        high = mid;
1383                else
1384                        return mid;
1385        }
1386        return ~low; /* not found, return 1's complement of insert position */
1387}
1388
1389/*
1390 * If name contains '=', then sets the variable, otherwise it unsets it
1391 * Size includes the terminating NULL. Env must have room for size + 1 entries
1392 * (in case of insert). Returns the new size. Optionally frees removed entries.
1393 */
1394static int do_putenv(char **env, const char *name, int size, int free_old)
1395{
1396        int i = bsearchenv(env, name, size - 1);
1397
1398        /* optionally free removed / replaced entry */
1399        if (i >= 0 && free_old)
1400                free(env[i]);
1401
1402        if (strchr(name, '=')) {
1403                /* if new value ('key=value') is specified, insert or replace entry */
1404                if (i < 0) {
1405                        i = ~i;
1406                        memmove(&env[i + 1], &env[i], (size - i) * sizeof(char*));
1407                        size++;
1408                }
1409                env[i] = (char*) name;
1410        } else if (i >= 0) {
1411                /* otherwise ('key') remove existing entry */
1412                size--;
1413                memmove(&env[i], &env[i + 1], (size - i) * sizeof(char*));
1414        }
1415        return size;
1416}
1417
1418char *mingw_getenv(const char *name)
1419{
1420        char *value;
1421        int pos = bsearchenv(environ, name, environ_size - 1);
1422        if (pos < 0)
1423                return NULL;
1424        value = strchr(environ[pos], '=');
1425        return value ? &value[1] : NULL;
1426}
1427
1428int mingw_putenv(const char *namevalue)
1429{
1430        ALLOC_GROW(environ, (environ_size + 1) * sizeof(char*), environ_alloc);
1431        environ_size = do_putenv(environ, namevalue, environ_size, 1);
1432        return 0;
1433}
1434
1435/*
1436 * Note, this isn't a complete replacement for getaddrinfo. It assumes
1437 * that service contains a numerical port, or that it is null. It
1438 * does a simple search using gethostbyname, and returns one IPv4 host
1439 * if one was found.
1440 */
1441static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1442                                   const struct addrinfo *hints,
1443                                   struct addrinfo **res)
1444{
1445        struct hostent *h = NULL;
1446        struct addrinfo *ai;
1447        struct sockaddr_in *sin;
1448
1449        if (node) {
1450                h = gethostbyname(node);
1451                if (!h)
1452                        return WSAGetLastError();
1453        }
1454
1455        ai = xmalloc(sizeof(struct addrinfo));
1456        *res = ai;
1457        ai->ai_flags = 0;
1458        ai->ai_family = AF_INET;
1459        ai->ai_socktype = hints ? hints->ai_socktype : 0;
1460        switch (ai->ai_socktype) {
1461        case SOCK_STREAM:
1462                ai->ai_protocol = IPPROTO_TCP;
1463                break;
1464        case SOCK_DGRAM:
1465                ai->ai_protocol = IPPROTO_UDP;
1466                break;
1467        default:
1468                ai->ai_protocol = 0;
1469                break;
1470        }
1471        ai->ai_addrlen = sizeof(struct sockaddr_in);
1472        if (hints && (hints->ai_flags & AI_CANONNAME))
1473                ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1474        else
1475                ai->ai_canonname = NULL;
1476
1477        sin = xcalloc(1, ai->ai_addrlen);
1478        sin->sin_family = AF_INET;
1479        /* Note: getaddrinfo is supposed to allow service to be a string,
1480         * which should be looked up using getservbyname. This is
1481         * currently not implemented */
1482        if (service)
1483                sin->sin_port = htons(atoi(service));
1484        if (h)
1485                sin->sin_addr = *(struct in_addr *)h->h_addr;
1486        else if (hints && (hints->ai_flags & AI_PASSIVE))
1487                sin->sin_addr.s_addr = INADDR_ANY;
1488        else
1489                sin->sin_addr.s_addr = INADDR_LOOPBACK;
1490        ai->ai_addr = (struct sockaddr *)sin;
1491        ai->ai_next = NULL;
1492        return 0;
1493}
1494
1495static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1496{
1497        free(res->ai_canonname);
1498        free(res->ai_addr);
1499        free(res);
1500}
1501
1502static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1503                                   char *host, DWORD hostlen,
1504                                   char *serv, DWORD servlen, int flags)
1505{
1506        const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1507        if (sa->sa_family != AF_INET)
1508                return EAI_FAMILY;
1509        if (!host && !serv)
1510                return EAI_NONAME;
1511
1512        if (host && hostlen > 0) {
1513                struct hostent *ent = NULL;
1514                if (!(flags & NI_NUMERICHOST))
1515                        ent = gethostbyaddr((const char *)&sin->sin_addr,
1516                                            sizeof(sin->sin_addr), AF_INET);
1517
1518                if (ent)
1519                        snprintf(host, hostlen, "%s", ent->h_name);
1520                else if (flags & NI_NAMEREQD)
1521                        return EAI_NONAME;
1522                else
1523                        snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1524        }
1525
1526        if (serv && servlen > 0) {
1527                struct servent *ent = NULL;
1528                if (!(flags & NI_NUMERICSERV))
1529                        ent = getservbyport(sin->sin_port,
1530                                            flags & NI_DGRAM ? "udp" : "tcp");
1531
1532                if (ent)
1533                        snprintf(serv, servlen, "%s", ent->s_name);
1534                else
1535                        snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1536        }
1537
1538        return 0;
1539}
1540
1541static HMODULE ipv6_dll = NULL;
1542static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1543static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1544                                      const struct addrinfo *hints,
1545                                      struct addrinfo **res);
1546static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1547                                      char *host, DWORD hostlen,
1548                                      char *serv, DWORD servlen, int flags);
1549/*
1550 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1551 * don't need to try to load that one dynamically.
1552 */
1553
1554static void socket_cleanup(void)
1555{
1556        WSACleanup();
1557        if (ipv6_dll)
1558                FreeLibrary(ipv6_dll);
1559        ipv6_dll = NULL;
1560        ipv6_freeaddrinfo = freeaddrinfo_stub;
1561        ipv6_getaddrinfo = getaddrinfo_stub;
1562        ipv6_getnameinfo = getnameinfo_stub;
1563}
1564
1565static void ensure_socket_initialization(void)
1566{
1567        WSADATA wsa;
1568        static int initialized = 0;
1569        const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1570        const char **name;
1571
1572        if (initialized)
1573                return;
1574
1575        if (WSAStartup(MAKEWORD(2,2), &wsa))
1576                die("unable to initialize winsock subsystem, error %d",
1577                        WSAGetLastError());
1578
1579        for (name = libraries; *name; name++) {
1580                ipv6_dll = LoadLibrary(*name);
1581                if (!ipv6_dll)
1582                        continue;
1583
1584                ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1585                        GetProcAddress(ipv6_dll, "freeaddrinfo");
1586                ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1587                                                   const struct addrinfo *,
1588                                                   struct addrinfo **))
1589                        GetProcAddress(ipv6_dll, "getaddrinfo");
1590                ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1591                                                   socklen_t, char *, DWORD,
1592                                                   char *, DWORD, int))
1593                        GetProcAddress(ipv6_dll, "getnameinfo");
1594                if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1595                        FreeLibrary(ipv6_dll);
1596                        ipv6_dll = NULL;
1597                } else
1598                        break;
1599        }
1600        if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1601                ipv6_freeaddrinfo = freeaddrinfo_stub;
1602                ipv6_getaddrinfo = getaddrinfo_stub;
1603                ipv6_getnameinfo = getnameinfo_stub;
1604        }
1605
1606        atexit(socket_cleanup);
1607        initialized = 1;
1608}
1609
1610#undef gethostname
1611int mingw_gethostname(char *name, int namelen)
1612{
1613    ensure_socket_initialization();
1614    return gethostname(name, namelen);
1615}
1616
1617#undef gethostbyname
1618struct hostent *mingw_gethostbyname(const char *host)
1619{
1620        ensure_socket_initialization();
1621        return gethostbyname(host);
1622}
1623
1624void mingw_freeaddrinfo(struct addrinfo *res)
1625{
1626        ipv6_freeaddrinfo(res);
1627}
1628
1629int mingw_getaddrinfo(const char *node, const char *service,
1630                      const struct addrinfo *hints, struct addrinfo **res)
1631{
1632        ensure_socket_initialization();
1633        return ipv6_getaddrinfo(node, service, hints, res);
1634}
1635
1636int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1637                      char *host, DWORD hostlen, char *serv, DWORD servlen,
1638                      int flags)
1639{
1640        ensure_socket_initialization();
1641        return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1642}
1643
1644int mingw_socket(int domain, int type, int protocol)
1645{
1646        int sockfd;
1647        SOCKET s;
1648
1649        ensure_socket_initialization();
1650        s = WSASocket(domain, type, protocol, NULL, 0, 0);
1651        if (s == INVALID_SOCKET) {
1652                /*
1653                 * WSAGetLastError() values are regular BSD error codes
1654                 * biased by WSABASEERR.
1655                 * However, strerror() does not know about networking
1656                 * specific errors, which are values beginning at 38 or so.
1657                 * Therefore, we choose to leave the biased error code
1658                 * in errno so that _if_ someone looks up the code somewhere,
1659                 * then it is at least the number that are usually listed.
1660                 */
1661                errno = WSAGetLastError();
1662                return -1;
1663        }
1664        /* convert into a file descriptor */
1665        if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1666                closesocket(s);
1667                return error("unable to make a socket file descriptor: %s",
1668                        strerror(errno));
1669        }
1670        return sockfd;
1671}
1672
1673#undef connect
1674int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1675{
1676        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1677        return connect(s, sa, sz);
1678}
1679
1680#undef bind
1681int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1682{
1683        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1684        return bind(s, sa, sz);
1685}
1686
1687#undef setsockopt
1688int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1689{
1690        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1691        return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1692}
1693
1694#undef shutdown
1695int mingw_shutdown(int sockfd, int how)
1696{
1697        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1698        return shutdown(s, how);
1699}
1700
1701#undef listen
1702int mingw_listen(int sockfd, int backlog)
1703{
1704        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1705        return listen(s, backlog);
1706}
1707
1708#undef accept
1709int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1710{
1711        int sockfd2;
1712
1713        SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1714        SOCKET s2 = accept(s1, sa, sz);
1715
1716        /* convert into a file descriptor */
1717        if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1718                int err = errno;
1719                closesocket(s2);
1720                return error("unable to make a socket file descriptor: %s",
1721                        strerror(err));
1722        }
1723        return sockfd2;
1724}
1725
1726#undef rename
1727int mingw_rename(const char *pold, const char *pnew)
1728{
1729        DWORD attrs, gle;
1730        int tries = 0;
1731        wchar_t wpold[MAX_PATH], wpnew[MAX_PATH];
1732        if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0)
1733                return -1;
1734
1735        /*
1736         * Try native rename() first to get errno right.
1737         * It is based on MoveFile(), which cannot overwrite existing files.
1738         */
1739        if (!_wrename(wpold, wpnew))
1740                return 0;
1741        if (errno != EEXIST)
1742                return -1;
1743repeat:
1744        if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1745                return 0;
1746        /* TODO: translate more errors */
1747        gle = GetLastError();
1748        if (gle == ERROR_ACCESS_DENIED &&
1749            (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) {
1750                if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1751                        DWORD attrsold = GetFileAttributesW(wpold);
1752                        if (attrsold == INVALID_FILE_ATTRIBUTES ||
1753                            !(attrsold & FILE_ATTRIBUTE_DIRECTORY))
1754                                errno = EISDIR;
1755                        else if (!_wrmdir(wpnew))
1756                                goto repeat;
1757                        return -1;
1758                }
1759                if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1760                    SetFileAttributesW(wpnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1761                        if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING))
1762                                return 0;
1763                        gle = GetLastError();
1764                        /* revert file attributes on failure */
1765                        SetFileAttributesW(wpnew, attrs);
1766                }
1767        }
1768        if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1769                /*
1770                 * We assume that some other process had the source or
1771                 * destination file open at the wrong moment and retry.
1772                 * In order to give the other process a higher chance to
1773                 * complete its operation, we give up our time slice now.
1774                 * If we have to retry again, we do sleep a bit.
1775                 */
1776                Sleep(delay[tries]);
1777                tries++;
1778                goto repeat;
1779        }
1780        if (gle == ERROR_ACCESS_DENIED &&
1781               ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1782                       "Should I try again?", pold, pnew))
1783                goto repeat;
1784
1785        errno = EACCES;
1786        return -1;
1787}
1788
1789/*
1790 * Note that this doesn't return the actual pagesize, but
1791 * the allocation granularity. If future Windows specific git code
1792 * needs the real getpagesize function, we need to find another solution.
1793 */
1794int mingw_getpagesize(void)
1795{
1796        SYSTEM_INFO si;
1797        GetSystemInfo(&si);
1798        return si.dwAllocationGranularity;
1799}
1800
1801struct passwd *getpwuid(int uid)
1802{
1803        static char user_name[100];
1804        static struct passwd p;
1805
1806        DWORD len = sizeof(user_name);
1807        if (!GetUserName(user_name, &len))
1808                return NULL;
1809        p.pw_name = user_name;
1810        p.pw_gecos = "unknown";
1811        p.pw_dir = NULL;
1812        return &p;
1813}
1814
1815static HANDLE timer_event;
1816static HANDLE timer_thread;
1817static int timer_interval;
1818static int one_shot;
1819static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1820
1821/* The timer works like this:
1822 * The thread, ticktack(), is a trivial routine that most of the time
1823 * only waits to receive the signal to terminate. The main thread tells
1824 * the thread to terminate by setting the timer_event to the signalled
1825 * state.
1826 * But ticktack() interrupts the wait state after the timer's interval
1827 * length to call the signal handler.
1828 */
1829
1830static unsigned __stdcall ticktack(void *dummy)
1831{
1832        while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1833                mingw_raise(SIGALRM);
1834                if (one_shot)
1835                        break;
1836        }
1837        return 0;
1838}
1839
1840static int start_timer_thread(void)
1841{
1842        timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1843        if (timer_event) {
1844                timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1845                if (!timer_thread )
1846                        return errno = ENOMEM,
1847                                error("cannot start timer thread");
1848        } else
1849                return errno = ENOMEM,
1850                        error("cannot allocate resources for timer");
1851        return 0;
1852}
1853
1854static void stop_timer_thread(void)
1855{
1856        if (timer_event)
1857                SetEvent(timer_event);  /* tell thread to terminate */
1858        if (timer_thread) {
1859                int rc = WaitForSingleObject(timer_thread, 1000);
1860                if (rc == WAIT_TIMEOUT)
1861                        error("timer thread did not terminate timely");
1862                else if (rc != WAIT_OBJECT_0)
1863                        error("waiting for timer thread failed: %lu",
1864                              GetLastError());
1865                CloseHandle(timer_thread);
1866        }
1867        if (timer_event)
1868                CloseHandle(timer_event);
1869        timer_event = NULL;
1870        timer_thread = NULL;
1871}
1872
1873static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1874{
1875        return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1876}
1877
1878int setitimer(int type, struct itimerval *in, struct itimerval *out)
1879{
1880        static const struct timeval zero;
1881        static int atexit_done;
1882
1883        if (out != NULL)
1884                return errno = EINVAL,
1885                        error("setitimer param 3 != NULL not implemented");
1886        if (!is_timeval_eq(&in->it_interval, &zero) &&
1887            !is_timeval_eq(&in->it_interval, &in->it_value))
1888                return errno = EINVAL,
1889                        error("setitimer: it_interval must be zero or eq it_value");
1890
1891        if (timer_thread)
1892                stop_timer_thread();
1893
1894        if (is_timeval_eq(&in->it_value, &zero) &&
1895            is_timeval_eq(&in->it_interval, &zero))
1896                return 0;
1897
1898        timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1899        one_shot = is_timeval_eq(&in->it_interval, &zero);
1900        if (!atexit_done) {
1901                atexit(stop_timer_thread);
1902                atexit_done = 1;
1903        }
1904        return start_timer_thread();
1905}
1906
1907int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1908{
1909        if (sig != SIGALRM)
1910                return errno = EINVAL,
1911                        error("sigaction only implemented for SIGALRM");
1912        if (out != NULL)
1913                return errno = EINVAL,
1914                        error("sigaction: param 3 != NULL not implemented");
1915
1916        timer_fn = in->sa_handler;
1917        return 0;
1918}
1919
1920#undef signal
1921sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1922{
1923        sig_handler_t old;
1924
1925        switch (sig) {
1926        case SIGALRM:
1927                old = timer_fn;
1928                timer_fn = handler;
1929                break;
1930
1931        case SIGINT:
1932                old = sigint_fn;
1933                sigint_fn = handler;
1934                break;
1935
1936        default:
1937                return signal(sig, handler);
1938        }
1939
1940        return old;
1941}
1942
1943#undef raise
1944int mingw_raise(int sig)
1945{
1946        switch (sig) {
1947        case SIGALRM:
1948                if (timer_fn == SIG_DFL) {
1949                        if (isatty(STDERR_FILENO))
1950                                fputs("Alarm clock\n", stderr);
1951                        exit(128 + SIGALRM);
1952                } else if (timer_fn != SIG_IGN)
1953                        timer_fn(SIGALRM);
1954                return 0;
1955
1956        case SIGINT:
1957                if (sigint_fn == SIG_DFL)
1958                        exit(128 + SIGINT);
1959                else if (sigint_fn != SIG_IGN)
1960                        sigint_fn(SIGINT);
1961                return 0;
1962
1963        default:
1964                return raise(sig);
1965        }
1966}
1967
1968int link(const char *oldpath, const char *newpath)
1969{
1970        typedef BOOL (WINAPI *T)(LPCWSTR, LPCWSTR, LPSECURITY_ATTRIBUTES);
1971        static T create_hard_link = NULL;
1972        wchar_t woldpath[MAX_PATH], wnewpath[MAX_PATH];
1973        if (xutftowcs_path(woldpath, oldpath) < 0 ||
1974                xutftowcs_path(wnewpath, newpath) < 0)
1975                return -1;
1976
1977        if (!create_hard_link) {
1978                create_hard_link = (T) GetProcAddress(
1979                        GetModuleHandle("kernel32.dll"), "CreateHardLinkW");
1980                if (!create_hard_link)
1981                        create_hard_link = (T)-1;
1982        }
1983        if (create_hard_link == (T)-1) {
1984                errno = ENOSYS;
1985                return -1;
1986        }
1987        if (!create_hard_link(wnewpath, woldpath, NULL)) {
1988                errno = err_win_to_posix(GetLastError());
1989                return -1;
1990        }
1991        return 0;
1992}
1993
1994pid_t waitpid(pid_t pid, int *status, int options)
1995{
1996        HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1997            FALSE, pid);
1998        if (!h) {
1999                errno = ECHILD;
2000                return -1;
2001        }
2002
2003        if (pid > 0 && options & WNOHANG) {
2004                if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
2005                        CloseHandle(h);
2006                        return 0;
2007                }
2008                options &= ~WNOHANG;
2009        }
2010
2011        if (options == 0) {
2012                struct pinfo_t **ppinfo;
2013                if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
2014                        CloseHandle(h);
2015                        return 0;
2016                }
2017
2018                if (status)
2019                        GetExitCodeProcess(h, (LPDWORD)status);
2020
2021                EnterCriticalSection(&pinfo_cs);
2022
2023                ppinfo = &pinfo;
2024                while (*ppinfo) {
2025                        struct pinfo_t *info = *ppinfo;
2026                        if (info->pid == pid) {
2027                                CloseHandle(info->proc);
2028                                *ppinfo = info->next;
2029                                free(info);
2030                                break;
2031                        }
2032                        ppinfo = &info->next;
2033                }
2034
2035                LeaveCriticalSection(&pinfo_cs);
2036
2037                CloseHandle(h);
2038                return pid;
2039        }
2040        CloseHandle(h);
2041
2042        errno = EINVAL;
2043        return -1;
2044}
2045
2046int mingw_skip_dos_drive_prefix(char **path)
2047{
2048        int ret = has_dos_drive_prefix(*path);
2049        *path += ret;
2050        return ret;
2051}
2052
2053int mingw_offset_1st_component(const char *path)
2054{
2055        char *pos = (char *)path;
2056
2057        /* unc paths */
2058        if (!skip_dos_drive_prefix(&pos) &&
2059                        is_dir_sep(pos[0]) && is_dir_sep(pos[1])) {
2060                /* skip server name */
2061                pos = strpbrk(pos + 2, "\\/");
2062                if (!pos)
2063                        return 0; /* Error: malformed unc path */
2064
2065                do {
2066                        pos++;
2067                } while (*pos && !is_dir_sep(*pos));
2068        }
2069
2070        return pos + is_dir_sep(*pos) - path;
2071}
2072
2073int xutftowcsn(wchar_t *wcs, const char *utfs, size_t wcslen, int utflen)
2074{
2075        int upos = 0, wpos = 0;
2076        const unsigned char *utf = (const unsigned char*) utfs;
2077        if (!utf || !wcs || wcslen < 1) {
2078                errno = EINVAL;
2079                return -1;
2080        }
2081        /* reserve space for \0 */
2082        wcslen--;
2083        if (utflen < 0)
2084                utflen = INT_MAX;
2085
2086        while (upos < utflen) {
2087                int c = utf[upos++] & 0xff;
2088                if (utflen == INT_MAX && c == 0)
2089                        break;
2090
2091                if (wpos >= wcslen) {
2092                        wcs[wpos] = 0;
2093                        errno = ERANGE;
2094                        return -1;
2095                }
2096
2097                if (c < 0x80) {
2098                        /* ASCII */
2099                        wcs[wpos++] = c;
2100                } else if (c >= 0xc2 && c < 0xe0 && upos < utflen &&
2101                                (utf[upos] & 0xc0) == 0x80) {
2102                        /* 2-byte utf-8 */
2103                        c = ((c & 0x1f) << 6);
2104                        c |= (utf[upos++] & 0x3f);
2105                        wcs[wpos++] = c;
2106                } else if (c >= 0xe0 && c < 0xf0 && upos + 1 < utflen &&
2107                                !(c == 0xe0 && utf[upos] < 0xa0) && /* over-long encoding */
2108                                (utf[upos] & 0xc0) == 0x80 &&
2109                                (utf[upos + 1] & 0xc0) == 0x80) {
2110                        /* 3-byte utf-8 */
2111                        c = ((c & 0x0f) << 12);
2112                        c |= ((utf[upos++] & 0x3f) << 6);
2113                        c |= (utf[upos++] & 0x3f);
2114                        wcs[wpos++] = c;
2115                } else if (c >= 0xf0 && c < 0xf5 && upos + 2 < utflen &&
2116                                wpos + 1 < wcslen &&
2117                                !(c == 0xf0 && utf[upos] < 0x90) && /* over-long encoding */
2118                                !(c == 0xf4 && utf[upos] >= 0x90) && /* > \u10ffff */
2119                                (utf[upos] & 0xc0) == 0x80 &&
2120                                (utf[upos + 1] & 0xc0) == 0x80 &&
2121                                (utf[upos + 2] & 0xc0) == 0x80) {
2122                        /* 4-byte utf-8: convert to \ud8xx \udcxx surrogate pair */
2123                        c = ((c & 0x07) << 18);
2124                        c |= ((utf[upos++] & 0x3f) << 12);
2125                        c |= ((utf[upos++] & 0x3f) << 6);
2126                        c |= (utf[upos++] & 0x3f);
2127                        c -= 0x10000;
2128                        wcs[wpos++] = 0xd800 | (c >> 10);
2129                        wcs[wpos++] = 0xdc00 | (c & 0x3ff);
2130                } else if (c >= 0xa0) {
2131                        /* invalid utf-8 byte, printable unicode char: convert 1:1 */
2132                        wcs[wpos++] = c;
2133                } else {
2134                        /* invalid utf-8 byte, non-printable unicode: convert to hex */
2135                        static const char *hex = "0123456789abcdef";
2136                        wcs[wpos++] = hex[c >> 4];
2137                        if (wpos < wcslen)
2138                                wcs[wpos++] = hex[c & 0x0f];
2139                }
2140        }
2141        wcs[wpos] = 0;
2142        return wpos;
2143}
2144
2145int xwcstoutf(char *utf, const wchar_t *wcs, size_t utflen)
2146{
2147        if (!wcs || !utf || utflen < 1) {
2148                errno = EINVAL;
2149                return -1;
2150        }
2151        utflen = WideCharToMultiByte(CP_UTF8, 0, wcs, -1, utf, utflen, NULL, NULL);
2152        if (utflen)
2153                return utflen - 1;
2154        errno = ERANGE;
2155        return -1;
2156}
2157
2158static void setup_windows_environment(void)
2159{
2160        char *tmp = getenv("TMPDIR");
2161
2162        /* on Windows it is TMP and TEMP */
2163        if (!tmp) {
2164                if (!(tmp = getenv("TMP")))
2165                        tmp = getenv("TEMP");
2166                if (tmp) {
2167                        setenv("TMPDIR", tmp, 1);
2168                        tmp = getenv("TMPDIR");
2169                }
2170        }
2171
2172        if (tmp) {
2173                /*
2174                 * Convert all dir separators to forward slashes,
2175                 * to help shell commands called from the Git
2176                 * executable (by not mistaking the dir separators
2177                 * for escape characters).
2178                 */
2179                convert_slashes(tmp);
2180        }
2181
2182        /* simulate TERM to enable auto-color (see color.c) */
2183        if (!getenv("TERM"))
2184                setenv("TERM", "cygwin", 1);
2185}
2186
2187/*
2188 * Disable MSVCRT command line wildcard expansion (__getmainargs called from
2189 * mingw startup code, see init.c in mingw runtime).
2190 */
2191int _CRT_glob = 0;
2192
2193typedef struct {
2194        int newmode;
2195} _startupinfo;
2196
2197extern int __wgetmainargs(int *argc, wchar_t ***argv, wchar_t ***env, int glob,
2198                _startupinfo *si);
2199
2200static NORETURN void die_startup(void)
2201{
2202        fputs("fatal: not enough memory for initialization", stderr);
2203        exit(128);
2204}
2205
2206static void *malloc_startup(size_t size)
2207{
2208        void *result = malloc(size);
2209        if (!result)
2210                die_startup();
2211        return result;
2212}
2213
2214static char *wcstoutfdup_startup(char *buffer, const wchar_t *wcs, size_t len)
2215{
2216        len = xwcstoutf(buffer, wcs, len) + 1;
2217        return memcpy(malloc_startup(len), buffer, len);
2218}
2219
2220static void maybe_redirect_std_handle(const wchar_t *key, DWORD std_id, int fd,
2221                                      DWORD desired_access, DWORD flags)
2222{
2223        DWORD create_flag = fd ? OPEN_ALWAYS : OPEN_EXISTING;
2224        wchar_t buf[MAX_PATH];
2225        DWORD max = ARRAY_SIZE(buf);
2226        HANDLE handle;
2227        DWORD ret = GetEnvironmentVariableW(key, buf, max);
2228
2229        if (!ret || ret >= max)
2230                return;
2231
2232        /* make sure this does not leak into child processes */
2233        SetEnvironmentVariableW(key, NULL);
2234        if (!wcscmp(buf, L"off")) {
2235                close(fd);
2236                handle = GetStdHandle(std_id);
2237                if (handle != INVALID_HANDLE_VALUE)
2238                        CloseHandle(handle);
2239                return;
2240        }
2241        if (std_id == STD_ERROR_HANDLE && !wcscmp(buf, L"2>&1")) {
2242                handle = GetStdHandle(STD_OUTPUT_HANDLE);
2243                if (handle == INVALID_HANDLE_VALUE) {
2244                        close(fd);
2245                        handle = GetStdHandle(std_id);
2246                        if (handle != INVALID_HANDLE_VALUE)
2247                                CloseHandle(handle);
2248                } else {
2249                        int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2250                        SetStdHandle(std_id, handle);
2251                        dup2(new_fd, fd);
2252                        /* do *not* close the new_fd: that would close stdout */
2253                }
2254                return;
2255        }
2256        handle = CreateFileW(buf, desired_access, 0, NULL, create_flag,
2257                             flags, NULL);
2258        if (handle != INVALID_HANDLE_VALUE) {
2259                int new_fd = _open_osfhandle((intptr_t)handle, O_BINARY);
2260                SetStdHandle(std_id, handle);
2261                dup2(new_fd, fd);
2262                close(new_fd);
2263        }
2264}
2265
2266static void maybe_redirect_std_handles(void)
2267{
2268        maybe_redirect_std_handle(L"GIT_REDIRECT_STDIN", STD_INPUT_HANDLE, 0,
2269                                  GENERIC_READ, FILE_ATTRIBUTE_NORMAL);
2270        maybe_redirect_std_handle(L"GIT_REDIRECT_STDOUT", STD_OUTPUT_HANDLE, 1,
2271                                  GENERIC_WRITE, FILE_ATTRIBUTE_NORMAL);
2272        maybe_redirect_std_handle(L"GIT_REDIRECT_STDERR", STD_ERROR_HANDLE, 2,
2273                                  GENERIC_WRITE, FILE_FLAG_NO_BUFFERING);
2274}
2275
2276void mingw_startup(void)
2277{
2278        int i, maxlen, argc;
2279        char *buffer;
2280        wchar_t **wenv, **wargv;
2281        _startupinfo si;
2282
2283        maybe_redirect_std_handles();
2284
2285        /* get wide char arguments and environment */
2286        si.newmode = 0;
2287        if (__wgetmainargs(&argc, &wargv, &wenv, _CRT_glob, &si) < 0)
2288                die_startup();
2289
2290        /* determine size of argv and environ conversion buffer */
2291        maxlen = wcslen(wargv[0]);
2292        for (i = 1; i < argc; i++)
2293                maxlen = max(maxlen, wcslen(wargv[i]));
2294        for (i = 0; wenv[i]; i++)
2295                maxlen = max(maxlen, wcslen(wenv[i]));
2296
2297        /*
2298         * nedmalloc can't free CRT memory, allocate resizable environment
2299         * list. Note that xmalloc / xmemdupz etc. call getenv, so we cannot
2300         * use it while initializing the environment itself.
2301         */
2302        environ_size = i + 1;
2303        environ_alloc = alloc_nr(environ_size * sizeof(char*));
2304        environ = malloc_startup(environ_alloc);
2305
2306        /* allocate buffer (wchar_t encodes to max 3 UTF-8 bytes) */
2307        maxlen = 3 * maxlen + 1;
2308        buffer = malloc_startup(maxlen);
2309
2310        /* convert command line arguments and environment to UTF-8 */
2311        for (i = 0; i < argc; i++)
2312                __argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
2313        for (i = 0; wenv[i]; i++)
2314                environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
2315        environ[i] = NULL;
2316        free(buffer);
2317
2318        /* sort environment for O(log n) getenv / putenv */
2319        qsort(environ, i, sizeof(char*), compareenv);
2320
2321        /* fix Windows specific environment settings */
2322        setup_windows_environment();
2323
2324        /* initialize critical section for waitpid pinfo_t list */
2325        InitializeCriticalSection(&pinfo_cs);
2326
2327        /* set up default file mode and file modes for stdin/out/err */
2328        _fmode = _O_BINARY;
2329        _setmode(_fileno(stdin), _O_BINARY);
2330        _setmode(_fileno(stdout), _O_BINARY);
2331        _setmode(_fileno(stderr), _O_BINARY);
2332
2333        /* initialize Unicode console */
2334        winansi_init();
2335}
2336
2337int uname(struct utsname *buf)
2338{
2339        unsigned v = (unsigned)GetVersion();
2340        memset(buf, 0, sizeof(*buf));
2341        xsnprintf(buf->sysname, sizeof(buf->sysname), "Windows");
2342        xsnprintf(buf->release, sizeof(buf->release),
2343                 "%u.%u", v & 0xff, (v >> 8) & 0xff);
2344        /* assuming NT variants only.. */
2345        xsnprintf(buf->version, sizeof(buf->version),
2346                  "%u", (v >> 16) & 0x7fff);
2347        return 0;
2348}