c749a0259d3651dec6d85a6832cad297ef6aeb1d
   1#include "../git-compat-util.h"
   2#include "win32.h"
   3#include <conio.h>
   4#include "../strbuf.h"
   5#include "../run-command.h"
   6
   7static const int delay[] = { 0, 1, 10, 20, 40 };
   8
   9int err_win_to_posix(DWORD winerr)
  10{
  11        int error = ENOSYS;
  12        switch(winerr) {
  13        case ERROR_ACCESS_DENIED: error = EACCES; break;
  14        case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  15        case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  16        case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  17        case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  18        case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  19        case ERROR_BAD_COMMAND: error = EIO; break;
  20        case ERROR_BAD_DEVICE: error = ENODEV; break;
  21        case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  22        case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  23        case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  24        case ERROR_BAD_LENGTH: error = EINVAL; break;
  25        case ERROR_BAD_PATHNAME: error = ENOENT; break;
  26        case ERROR_BAD_PIPE: error = EPIPE; break;
  27        case ERROR_BAD_UNIT: error = ENODEV; break;
  28        case ERROR_BAD_USERNAME: error = EINVAL; break;
  29        case ERROR_BROKEN_PIPE: error = EPIPE; break;
  30        case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  31        case ERROR_BUSY: error = EBUSY; break;
  32        case ERROR_BUSY_DRIVE: error = EBUSY; break;
  33        case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  34        case ERROR_CANNOT_MAKE: error = EACCES; break;
  35        case ERROR_CANTOPEN: error = EIO; break;
  36        case ERROR_CANTREAD: error = EIO; break;
  37        case ERROR_CANTWRITE: error = EIO; break;
  38        case ERROR_CRC: error = EIO; break;
  39        case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  40        case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  41        case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  42        case ERROR_DIRECTORY: error = EINVAL; break;
  43        case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  44        case ERROR_DISK_CHANGE: error = EIO; break;
  45        case ERROR_DISK_FULL: error = ENOSPC; break;
  46        case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  47        case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  48        case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  49        case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  50        case ERROR_FILE_EXISTS: error = EEXIST; break;
  51        case ERROR_FILE_INVALID: error = ENODEV; break;
  52        case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  53        case ERROR_GEN_FAILURE: error = EIO; break;
  54        case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  55        case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  56        case ERROR_INVALID_ACCESS: error = EACCES; break;
  57        case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  58        case ERROR_INVALID_BLOCK: error = EFAULT; break;
  59        case ERROR_INVALID_DATA: error = EINVAL; break;
  60        case ERROR_INVALID_DRIVE: error = ENODEV; break;
  61        case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  62        case ERROR_INVALID_FLAGS: error = EINVAL; break;
  63        case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  64        case ERROR_INVALID_HANDLE: error = EBADF; break;
  65        case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  66        case ERROR_INVALID_NAME: error = EINVAL; break;
  67        case ERROR_INVALID_OWNER: error = EINVAL; break;
  68        case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  69        case ERROR_INVALID_PASSWORD: error = EPERM; break;
  70        case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  71        case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  72        case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  73        case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  74        case ERROR_IO_DEVICE: error = EIO; break;
  75        case ERROR_IO_INCOMPLETE: error = EINTR; break;
  76        case ERROR_LOCKED: error = EBUSY; break;
  77        case ERROR_LOCK_VIOLATION: error = EACCES; break;
  78        case ERROR_LOGON_FAILURE: error = EACCES; break;
  79        case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  80        case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  81        case ERROR_MORE_DATA: error = EPIPE; break;
  82        case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  83        case ERROR_NOACCESS: error = EFAULT; break;
  84        case ERROR_NONE_MAPPED: error = EINVAL; break;
  85        case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  86        case ERROR_NOT_READY: error = EAGAIN; break;
  87        case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  88        case ERROR_NO_DATA: error = EPIPE; break;
  89        case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  90        case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  91        case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  92        case ERROR_OPEN_FAILED: error = EIO; break;
  93        case ERROR_OPEN_FILES: error = EBUSY; break;
  94        case ERROR_OPERATION_ABORTED: error = EINTR; break;
  95        case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  96        case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
  97        case ERROR_PATH_BUSY: error = EBUSY; break;
  98        case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
  99        case ERROR_PIPE_BUSY: error = EBUSY; break;
 100        case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 101        case ERROR_PIPE_LISTENING: error = EPIPE; break;
 102        case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 103        case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 104        case ERROR_READ_FAULT: error = EIO; break;
 105        case ERROR_SEEK: error = EIO; break;
 106        case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 107        case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 108        case ERROR_SHARING_VIOLATION: error = EACCES; break;
 109        case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 110        case ERROR_SWAPERROR: error = ENOENT; break;
 111        case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 112        case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 113        case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 114        case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 115        case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 116        case ERROR_WRITE_FAULT: error = EIO; break;
 117        case ERROR_WRITE_PROTECT: error = EROFS; break;
 118        }
 119        return error;
 120}
 121
 122static inline int is_file_in_use_error(DWORD errcode)
 123{
 124        switch (errcode) {
 125        case ERROR_SHARING_VIOLATION:
 126        case ERROR_ACCESS_DENIED:
 127                return 1;
 128        }
 129
 130        return 0;
 131}
 132
 133static int read_yes_no_answer(void)
 134{
 135        char answer[1024];
 136
 137        if (fgets(answer, sizeof(answer), stdin)) {
 138                size_t answer_len = strlen(answer);
 139                int got_full_line = 0, c;
 140
 141                /* remove the newline */
 142                if (answer_len >= 2 && answer[answer_len-2] == '\r') {
 143                        answer[answer_len-2] = '\0';
 144                        got_full_line = 1;
 145                } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
 146                        answer[answer_len-1] = '\0';
 147                        got_full_line = 1;
 148                }
 149                /* flush the buffer in case we did not get the full line */
 150                if (!got_full_line)
 151                        while ((c = getchar()) != EOF && c != '\n')
 152                                ;
 153        } else
 154                /* we could not read, return the
 155                 * default answer which is no */
 156                return 0;
 157
 158        if (tolower(answer[0]) == 'y' && !answer[1])
 159                return 1;
 160        if (!strncasecmp(answer, "yes", sizeof(answer)))
 161                return 1;
 162        if (tolower(answer[0]) == 'n' && !answer[1])
 163                return 0;
 164        if (!strncasecmp(answer, "no", sizeof(answer)))
 165                return 0;
 166
 167        /* did not find an answer we understand */
 168        return -1;
 169}
 170
 171static int ask_yes_no_if_possible(const char *format, ...)
 172{
 173        char question[4096];
 174        const char *retry_hook[] = { NULL, NULL, NULL };
 175        va_list args;
 176
 177        va_start(args, format);
 178        vsnprintf(question, sizeof(question), format, args);
 179        va_end(args);
 180
 181        if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) {
 182                retry_hook[1] = question;
 183                return !run_command_v_opt(retry_hook, 0);
 184        }
 185
 186        if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
 187                return 0;
 188
 189        while (1) {
 190                int answer;
 191                fprintf(stderr, "%s (y/n) ", question);
 192
 193                if ((answer = read_yes_no_answer()) >= 0)
 194                        return answer;
 195
 196                fprintf(stderr, "Sorry, I did not understand your answer. "
 197                                "Please type 'y' or 'n'\n");
 198        }
 199}
 200
 201#undef unlink
 202int mingw_unlink(const char *pathname)
 203{
 204        int ret, tries = 0;
 205
 206        /* read-only files cannot be removed */
 207        chmod(pathname, 0666);
 208        while ((ret = unlink(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 209                if (!is_file_in_use_error(GetLastError()))
 210                        break;
 211                /*
 212                 * We assume that some other process had the source or
 213                 * destination file open at the wrong moment and retry.
 214                 * In order to give the other process a higher chance to
 215                 * complete its operation, we give up our time slice now.
 216                 * If we have to retry again, we do sleep a bit.
 217                 */
 218                Sleep(delay[tries]);
 219                tries++;
 220        }
 221        while (ret == -1 && is_file_in_use_error(GetLastError()) &&
 222               ask_yes_no_if_possible("Unlink of file '%s' failed. "
 223                        "Should I try again?", pathname))
 224               ret = unlink(pathname);
 225        return ret;
 226}
 227
 228static int is_dir_empty(const char *path)
 229{
 230        struct strbuf buf = STRBUF_INIT;
 231        WIN32_FIND_DATAA findbuf;
 232        HANDLE handle;
 233
 234        strbuf_addf(&buf, "%s\\*", path);
 235        handle = FindFirstFileA(buf.buf, &findbuf);
 236        if (handle == INVALID_HANDLE_VALUE) {
 237                strbuf_release(&buf);
 238                return GetLastError() == ERROR_NO_MORE_FILES;
 239        }
 240
 241        while (!strcmp(findbuf.cFileName, ".") ||
 242                        !strcmp(findbuf.cFileName, ".."))
 243                if (!FindNextFile(handle, &findbuf)) {
 244                        strbuf_release(&buf);
 245                        return GetLastError() == ERROR_NO_MORE_FILES;
 246                }
 247        FindClose(handle);
 248        strbuf_release(&buf);
 249        return 0;
 250}
 251
 252#undef rmdir
 253int mingw_rmdir(const char *pathname)
 254{
 255        int ret, tries = 0;
 256
 257        while ((ret = rmdir(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 258                if (!is_file_in_use_error(GetLastError()))
 259                        break;
 260                if (!is_dir_empty(pathname)) {
 261                        errno = ENOTEMPTY;
 262                        break;
 263                }
 264                /*
 265                 * We assume that some other process had the source or
 266                 * destination file open at the wrong moment and retry.
 267                 * In order to give the other process a higher chance to
 268                 * complete its operation, we give up our time slice now.
 269                 * If we have to retry again, we do sleep a bit.
 270                 */
 271                Sleep(delay[tries]);
 272                tries++;
 273        }
 274        while (ret == -1 && is_file_in_use_error(GetLastError()) &&
 275               ask_yes_no_if_possible("Deletion of directory '%s' failed. "
 276                        "Should I try again?", pathname))
 277               ret = rmdir(pathname);
 278        return ret;
 279}
 280
 281#undef open
 282int mingw_open (const char *filename, int oflags, ...)
 283{
 284        va_list args;
 285        unsigned mode;
 286        int fd;
 287
 288        va_start(args, oflags);
 289        mode = va_arg(args, int);
 290        va_end(args);
 291
 292        if (filename && !strcmp(filename, "/dev/null"))
 293                filename = "nul";
 294
 295        fd = open(filename, oflags, mode);
 296
 297        if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 298                DWORD attrs = GetFileAttributes(filename);
 299                if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 300                        errno = EISDIR;
 301        }
 302        return fd;
 303}
 304
 305#undef write
 306ssize_t mingw_write(int fd, const void *buf, size_t count)
 307{
 308        /*
 309         * While write() calls to a file on a local disk are translated
 310         * into WriteFile() calls with a maximum size of 64KB on Windows
 311         * XP and 256KB on Vista, no such cap is placed on writes to
 312         * files over the network on Windows XP.  Unfortunately, there
 313         * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 314         * bigger writes fail on Windows XP.
 315         * So we cap to a nice 31MB here to avoid write failures over
 316         * the net without changing the number of WriteFile() calls in
 317         * the local case.
 318         */
 319        return write(fd, buf, min(count, 31 * 1024 * 1024));
 320}
 321
 322static BOOL WINAPI ctrl_ignore(DWORD type)
 323{
 324        return TRUE;
 325}
 326
 327#undef fgetc
 328int mingw_fgetc(FILE *stream)
 329{
 330        int ch;
 331        if (!isatty(_fileno(stream)))
 332                return fgetc(stream);
 333
 334        SetConsoleCtrlHandler(ctrl_ignore, TRUE);
 335        while (1) {
 336                ch = fgetc(stream);
 337                if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
 338                        break;
 339
 340                /* Ctrl+C was pressed, simulate SIGINT and retry */
 341                mingw_raise(SIGINT);
 342        }
 343        SetConsoleCtrlHandler(ctrl_ignore, FALSE);
 344        return ch;
 345}
 346
 347#undef fopen
 348FILE *mingw_fopen (const char *filename, const char *otype)
 349{
 350        if (filename && !strcmp(filename, "/dev/null"))
 351                filename = "nul";
 352        return fopen(filename, otype);
 353}
 354
 355#undef freopen
 356FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 357{
 358        if (filename && !strcmp(filename, "/dev/null"))
 359                filename = "nul";
 360        return freopen(filename, otype, stream);
 361}
 362
 363#undef fflush
 364int mingw_fflush(FILE *stream)
 365{
 366        int ret = fflush(stream);
 367
 368        /*
 369         * write() is used behind the scenes of stdio output functions.
 370         * Since git code does not check for errors after each stdio write
 371         * operation, it can happen that write() is called by a later
 372         * stdio function even if an earlier write() call failed. In the
 373         * case of a pipe whose readable end was closed, only the first
 374         * call to write() reports EPIPE on Windows. Subsequent write()
 375         * calls report EINVAL. It is impossible to notice whether this
 376         * fflush invocation triggered such a case, therefore, we have to
 377         * catch all EINVAL errors whole-sale.
 378         */
 379        if (ret && errno == EINVAL)
 380                errno = EPIPE;
 381
 382        return ret;
 383}
 384
 385/*
 386 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 387 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 388 */
 389static inline long long filetime_to_hnsec(const FILETIME *ft)
 390{
 391        long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 392        /* Windows to Unix Epoch conversion */
 393        return winTime - 116444736000000000LL;
 394}
 395
 396static inline time_t filetime_to_time_t(const FILETIME *ft)
 397{
 398        return (time_t)(filetime_to_hnsec(ft) / 10000000);
 399}
 400
 401/* We keep the do_lstat code in a separate function to avoid recursion.
 402 * When a path ends with a slash, the stat will fail with ENOENT. In
 403 * this case, we strip the trailing slashes and stat again.
 404 *
 405 * If follow is true then act like stat() and report on the link
 406 * target. Otherwise report on the link itself.
 407 */
 408static int do_lstat(int follow, const char *file_name, struct stat *buf)
 409{
 410        int err;
 411        WIN32_FILE_ATTRIBUTE_DATA fdata;
 412
 413        if (!(err = get_file_attr(file_name, &fdata))) {
 414                buf->st_ino = 0;
 415                buf->st_gid = 0;
 416                buf->st_uid = 0;
 417                buf->st_nlink = 1;
 418                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 419                buf->st_size = fdata.nFileSizeLow |
 420                        (((off_t)fdata.nFileSizeHigh)<<32);
 421                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 422                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 423                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 424                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 425                if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 426                        WIN32_FIND_DATAA findbuf;
 427                        HANDLE handle = FindFirstFileA(file_name, &findbuf);
 428                        if (handle != INVALID_HANDLE_VALUE) {
 429                                if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 430                                                (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 431                                        if (follow) {
 432                                                char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 433                                                buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 434                                        } else {
 435                                                buf->st_mode = S_IFLNK;
 436                                        }
 437                                        buf->st_mode |= S_IREAD;
 438                                        if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 439                                                buf->st_mode |= S_IWRITE;
 440                                }
 441                                FindClose(handle);
 442                        }
 443                }
 444                return 0;
 445        }
 446        errno = err;
 447        return -1;
 448}
 449
 450/* We provide our own lstat/fstat functions, since the provided
 451 * lstat/fstat functions are so slow. These stat functions are
 452 * tailored for Git's usage (read: fast), and are not meant to be
 453 * complete. Note that Git stat()s are redirected to mingw_lstat()
 454 * too, since Windows doesn't really handle symlinks that well.
 455 */
 456static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 457{
 458        int namelen;
 459        static char alt_name[PATH_MAX];
 460
 461        if (!do_lstat(follow, file_name, buf))
 462                return 0;
 463
 464        /* if file_name ended in a '/', Windows returned ENOENT;
 465         * try again without trailing slashes
 466         */
 467        if (errno != ENOENT)
 468                return -1;
 469
 470        namelen = strlen(file_name);
 471        if (namelen && file_name[namelen-1] != '/')
 472                return -1;
 473        while (namelen && file_name[namelen-1] == '/')
 474                --namelen;
 475        if (!namelen || namelen >= PATH_MAX)
 476                return -1;
 477
 478        memcpy(alt_name, file_name, namelen);
 479        alt_name[namelen] = 0;
 480        return do_lstat(follow, alt_name, buf);
 481}
 482
 483int mingw_lstat(const char *file_name, struct stat *buf)
 484{
 485        return do_stat_internal(0, file_name, buf);
 486}
 487int mingw_stat(const char *file_name, struct stat *buf)
 488{
 489        return do_stat_internal(1, file_name, buf);
 490}
 491
 492#undef fstat
 493int mingw_fstat(int fd, struct stat *buf)
 494{
 495        HANDLE fh = (HANDLE)_get_osfhandle(fd);
 496        BY_HANDLE_FILE_INFORMATION fdata;
 497
 498        if (fh == INVALID_HANDLE_VALUE) {
 499                errno = EBADF;
 500                return -1;
 501        }
 502        /* direct non-file handles to MS's fstat() */
 503        if (GetFileType(fh) != FILE_TYPE_DISK)
 504                return _fstati64(fd, buf);
 505
 506        if (GetFileInformationByHandle(fh, &fdata)) {
 507                buf->st_ino = 0;
 508                buf->st_gid = 0;
 509                buf->st_uid = 0;
 510                buf->st_nlink = 1;
 511                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 512                buf->st_size = fdata.nFileSizeLow |
 513                        (((off_t)fdata.nFileSizeHigh)<<32);
 514                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 515                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 516                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 517                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 518                return 0;
 519        }
 520        errno = EBADF;
 521        return -1;
 522}
 523
 524static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 525{
 526        long long winTime = t * 10000000LL + 116444736000000000LL;
 527        ft->dwLowDateTime = winTime;
 528        ft->dwHighDateTime = winTime >> 32;
 529}
 530
 531int mingw_utime (const char *file_name, const struct utimbuf *times)
 532{
 533        FILETIME mft, aft;
 534        int fh, rc;
 535
 536        /* must have write permission */
 537        DWORD attrs = GetFileAttributes(file_name);
 538        if (attrs != INVALID_FILE_ATTRIBUTES &&
 539            (attrs & FILE_ATTRIBUTE_READONLY)) {
 540                /* ignore errors here; open() will report them */
 541                SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 542        }
 543
 544        if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 545                rc = -1;
 546                goto revert_attrs;
 547        }
 548
 549        if (times) {
 550                time_t_to_filetime(times->modtime, &mft);
 551                time_t_to_filetime(times->actime, &aft);
 552        } else {
 553                GetSystemTimeAsFileTime(&mft);
 554                aft = mft;
 555        }
 556        if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 557                errno = EINVAL;
 558                rc = -1;
 559        } else
 560                rc = 0;
 561        close(fh);
 562
 563revert_attrs:
 564        if (attrs != INVALID_FILE_ATTRIBUTES &&
 565            (attrs & FILE_ATTRIBUTE_READONLY)) {
 566                /* ignore errors again */
 567                SetFileAttributes(file_name, attrs);
 568        }
 569        return rc;
 570}
 571
 572unsigned int sleep (unsigned int seconds)
 573{
 574        Sleep(seconds*1000);
 575        return 0;
 576}
 577
 578int mkstemp(char *template)
 579{
 580        char *filename = mktemp(template);
 581        if (filename == NULL)
 582                return -1;
 583        return open(filename, O_RDWR | O_CREAT, 0600);
 584}
 585
 586int gettimeofday(struct timeval *tv, void *tz)
 587{
 588        FILETIME ft;
 589        long long hnsec;
 590
 591        GetSystemTimeAsFileTime(&ft);
 592        hnsec = filetime_to_hnsec(&ft);
 593        tv->tv_sec = hnsec / 10000000;
 594        tv->tv_usec = (hnsec % 10000000) / 10;
 595        return 0;
 596}
 597
 598int pipe(int filedes[2])
 599{
 600        HANDLE h[2];
 601
 602        /* this creates non-inheritable handles */
 603        if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 604                errno = err_win_to_posix(GetLastError());
 605                return -1;
 606        }
 607        filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 608        if (filedes[0] < 0) {
 609                CloseHandle(h[0]);
 610                CloseHandle(h[1]);
 611                return -1;
 612        }
 613        filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 614        if (filedes[0] < 0) {
 615                close(filedes[0]);
 616                CloseHandle(h[1]);
 617                return -1;
 618        }
 619        return 0;
 620}
 621
 622struct tm *gmtime_r(const time_t *timep, struct tm *result)
 623{
 624        /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 625        memcpy(result, gmtime(timep), sizeof(struct tm));
 626        return result;
 627}
 628
 629struct tm *localtime_r(const time_t *timep, struct tm *result)
 630{
 631        /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 632        memcpy(result, localtime(timep), sizeof(struct tm));
 633        return result;
 634}
 635
 636#undef getcwd
 637char *mingw_getcwd(char *pointer, int len)
 638{
 639        int i;
 640        char *ret = getcwd(pointer, len);
 641        if (!ret)
 642                return ret;
 643        for (i = 0; pointer[i]; i++)
 644                if (pointer[i] == '\\')
 645                        pointer[i] = '/';
 646        return ret;
 647}
 648
 649/*
 650 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 651 * (Parsing C++ Command-Line Arguments)
 652 */
 653static const char *quote_arg(const char *arg)
 654{
 655        /* count chars to quote */
 656        int len = 0, n = 0;
 657        int force_quotes = 0;
 658        char *q, *d;
 659        const char *p = arg;
 660        if (!*p) force_quotes = 1;
 661        while (*p) {
 662                if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 663                        force_quotes = 1;
 664                else if (*p == '"')
 665                        n++;
 666                else if (*p == '\\') {
 667                        int count = 0;
 668                        while (*p == '\\') {
 669                                count++;
 670                                p++;
 671                                len++;
 672                        }
 673                        if (*p == '"')
 674                                n += count*2 + 1;
 675                        continue;
 676                }
 677                len++;
 678                p++;
 679        }
 680        if (!force_quotes && n == 0)
 681                return arg;
 682
 683        /* insert \ where necessary */
 684        d = q = xmalloc(len+n+3);
 685        *d++ = '"';
 686        while (*arg) {
 687                if (*arg == '"')
 688                        *d++ = '\\';
 689                else if (*arg == '\\') {
 690                        int count = 0;
 691                        while (*arg == '\\') {
 692                                count++;
 693                                *d++ = *arg++;
 694                        }
 695                        if (*arg == '"') {
 696                                while (count-- > 0)
 697                                        *d++ = '\\';
 698                                *d++ = '\\';
 699                        }
 700                }
 701                *d++ = *arg++;
 702        }
 703        *d++ = '"';
 704        *d++ = 0;
 705        return q;
 706}
 707
 708static const char *parse_interpreter(const char *cmd)
 709{
 710        static char buf[100];
 711        char *p, *opt;
 712        int n, fd;
 713
 714        /* don't even try a .exe */
 715        n = strlen(cmd);
 716        if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 717                return NULL;
 718
 719        fd = open(cmd, O_RDONLY);
 720        if (fd < 0)
 721                return NULL;
 722        n = read(fd, buf, sizeof(buf)-1);
 723        close(fd);
 724        if (n < 4)      /* at least '#!/x' and not error */
 725                return NULL;
 726
 727        if (buf[0] != '#' || buf[1] != '!')
 728                return NULL;
 729        buf[n] = '\0';
 730        p = buf + strcspn(buf, "\r\n");
 731        if (!*p)
 732                return NULL;
 733
 734        *p = '\0';
 735        if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 736                return NULL;
 737        /* strip options */
 738        if ((opt = strchr(p+1, ' ')))
 739                *opt = '\0';
 740        return p+1;
 741}
 742
 743/*
 744 * Splits the PATH into parts.
 745 */
 746static char **get_path_split(void)
 747{
 748        char *p, **path, *envpath = mingw_getenv("PATH");
 749        int i, n = 0;
 750
 751        if (!envpath || !*envpath)
 752                return NULL;
 753
 754        envpath = xstrdup(envpath);
 755        p = envpath;
 756        while (p) {
 757                char *dir = p;
 758                p = strchr(p, ';');
 759                if (p) *p++ = '\0';
 760                if (*dir) {     /* not earlier, catches series of ; */
 761                        ++n;
 762                }
 763        }
 764        if (!n)
 765                return NULL;
 766
 767        path = xmalloc((n+1)*sizeof(char *));
 768        p = envpath;
 769        i = 0;
 770        do {
 771                if (*p)
 772                        path[i++] = xstrdup(p);
 773                p = p+strlen(p)+1;
 774        } while (i < n);
 775        path[i] = NULL;
 776
 777        free(envpath);
 778
 779        return path;
 780}
 781
 782static void free_path_split(char **path)
 783{
 784        char **p = path;
 785
 786        if (!path)
 787                return;
 788
 789        while (*p)
 790                free(*p++);
 791        free(path);
 792}
 793
 794/*
 795 * exe_only means that we only want to detect .exe files, but not scripts
 796 * (which do not have an extension)
 797 */
 798static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 799{
 800        char path[MAX_PATH];
 801        snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 802
 803        if (!isexe && access(path, F_OK) == 0)
 804                return xstrdup(path);
 805        path[strlen(path)-4] = '\0';
 806        if ((!exe_only || isexe) && access(path, F_OK) == 0)
 807                if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 808                        return xstrdup(path);
 809        return NULL;
 810}
 811
 812/*
 813 * Determines the absolute path of cmd using the split path in path.
 814 * If cmd contains a slash or backslash, no lookup is performed.
 815 */
 816static char *path_lookup(const char *cmd, char **path, int exe_only)
 817{
 818        char *prog = NULL;
 819        int len = strlen(cmd);
 820        int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 821
 822        if (strchr(cmd, '/') || strchr(cmd, '\\'))
 823                prog = xstrdup(cmd);
 824
 825        while (!prog && *path)
 826                prog = lookup_prog(*path++, cmd, isexe, exe_only);
 827
 828        return prog;
 829}
 830
 831static int env_compare(const void *a, const void *b)
 832{
 833        char *const *ea = a;
 834        char *const *eb = b;
 835        return strcasecmp(*ea, *eb);
 836}
 837
 838struct pinfo_t {
 839        struct pinfo_t *next;
 840        pid_t pid;
 841        HANDLE proc;
 842} pinfo_t;
 843struct pinfo_t *pinfo = NULL;
 844CRITICAL_SECTION pinfo_cs;
 845
 846static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 847                              const char *dir,
 848                              int prepend_cmd, int fhin, int fhout, int fherr)
 849{
 850        STARTUPINFO si;
 851        PROCESS_INFORMATION pi;
 852        struct strbuf envblk, args;
 853        unsigned flags;
 854        BOOL ret;
 855
 856        /* Determine whether or not we are associated to a console */
 857        HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 858                        FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 859                        FILE_ATTRIBUTE_NORMAL, NULL);
 860        if (cons == INVALID_HANDLE_VALUE) {
 861                /* There is no console associated with this process.
 862                 * Since the child is a console process, Windows
 863                 * would normally create a console window. But
 864                 * since we'll be redirecting std streams, we do
 865                 * not need the console.
 866                 * It is necessary to use DETACHED_PROCESS
 867                 * instead of CREATE_NO_WINDOW to make ssh
 868                 * recognize that it has no console.
 869                 */
 870                flags = DETACHED_PROCESS;
 871        } else {
 872                /* There is already a console. If we specified
 873                 * DETACHED_PROCESS here, too, Windows would
 874                 * disassociate the child from the console.
 875                 * The same is true for CREATE_NO_WINDOW.
 876                 * Go figure!
 877                 */
 878                flags = 0;
 879                CloseHandle(cons);
 880        }
 881        memset(&si, 0, sizeof(si));
 882        si.cb = sizeof(si);
 883        si.dwFlags = STARTF_USESTDHANDLES;
 884        si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 885        si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 886        si.hStdError = (HANDLE) _get_osfhandle(fherr);
 887
 888        /* concatenate argv, quoting args as we go */
 889        strbuf_init(&args, 0);
 890        if (prepend_cmd) {
 891                char *quoted = (char *)quote_arg(cmd);
 892                strbuf_addstr(&args, quoted);
 893                if (quoted != cmd)
 894                        free(quoted);
 895        }
 896        for (; *argv; argv++) {
 897                char *quoted = (char *)quote_arg(*argv);
 898                if (*args.buf)
 899                        strbuf_addch(&args, ' ');
 900                strbuf_addstr(&args, quoted);
 901                if (quoted != *argv)
 902                        free(quoted);
 903        }
 904
 905        if (env) {
 906                int count = 0;
 907                char **e, **sorted_env;
 908
 909                for (e = env; *e; e++)
 910                        count++;
 911
 912                /* environment must be sorted */
 913                sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 914                memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 915                qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 916
 917                strbuf_init(&envblk, 0);
 918                for (e = sorted_env; *e; e++) {
 919                        strbuf_addstr(&envblk, *e);
 920                        strbuf_addch(&envblk, '\0');
 921                }
 922                free(sorted_env);
 923        }
 924
 925        memset(&pi, 0, sizeof(pi));
 926        ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 927                env ? envblk.buf : NULL, dir, &si, &pi);
 928
 929        if (env)
 930                strbuf_release(&envblk);
 931        strbuf_release(&args);
 932
 933        if (!ret) {
 934                errno = ENOENT;
 935                return -1;
 936        }
 937        CloseHandle(pi.hThread);
 938
 939        /*
 940         * The process ID is the human-readable identifier of the process
 941         * that we want to present in log and error messages. The handle
 942         * is not useful for this purpose. But we cannot close it, either,
 943         * because it is not possible to turn a process ID into a process
 944         * handle after the process terminated.
 945         * Keep the handle in a list for waitpid.
 946         */
 947        EnterCriticalSection(&pinfo_cs);
 948        {
 949                struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
 950                info->pid = pi.dwProcessId;
 951                info->proc = pi.hProcess;
 952                info->next = pinfo;
 953                pinfo = info;
 954        }
 955        LeaveCriticalSection(&pinfo_cs);
 956
 957        return (pid_t)pi.dwProcessId;
 958}
 959
 960static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 961                           int prepend_cmd)
 962{
 963        return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 964}
 965
 966pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 967                     const char *dir,
 968                     int fhin, int fhout, int fherr)
 969{
 970        pid_t pid;
 971        char **path = get_path_split();
 972        char *prog = path_lookup(cmd, path, 0);
 973
 974        if (!prog) {
 975                errno = ENOENT;
 976                pid = -1;
 977        }
 978        else {
 979                const char *interpr = parse_interpreter(prog);
 980
 981                if (interpr) {
 982                        const char *argv0 = argv[0];
 983                        char *iprog = path_lookup(interpr, path, 1);
 984                        argv[0] = prog;
 985                        if (!iprog) {
 986                                errno = ENOENT;
 987                                pid = -1;
 988                        }
 989                        else {
 990                                pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 991                                                       fhin, fhout, fherr);
 992                                free(iprog);
 993                        }
 994                        argv[0] = argv0;
 995                }
 996                else
 997                        pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
 998                                               fhin, fhout, fherr);
 999                free(prog);
1000        }
1001        free_path_split(path);
1002        return pid;
1003}
1004
1005static int try_shell_exec(const char *cmd, char *const *argv, char **env)
1006{
1007        const char *interpr = parse_interpreter(cmd);
1008        char **path;
1009        char *prog;
1010        int pid = 0;
1011
1012        if (!interpr)
1013                return 0;
1014        path = get_path_split();
1015        prog = path_lookup(interpr, path, 1);
1016        if (prog) {
1017                int argc = 0;
1018                const char **argv2;
1019                while (argv[argc]) argc++;
1020                argv2 = xmalloc(sizeof(*argv) * (argc+1));
1021                argv2[0] = (char *)cmd; /* full path to the script file */
1022                memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1023                pid = mingw_spawnve(prog, argv2, env, 1);
1024                if (pid >= 0) {
1025                        int status;
1026                        if (waitpid(pid, &status, 0) < 0)
1027                                status = 255;
1028                        exit(status);
1029                }
1030                pid = 1;        /* indicate that we tried but failed */
1031                free(prog);
1032                free(argv2);
1033        }
1034        free_path_split(path);
1035        return pid;
1036}
1037
1038static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
1039{
1040        /* check if git_command is a shell script */
1041        if (!try_shell_exec(cmd, argv, (char **)env)) {
1042                int pid, status;
1043
1044                pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
1045                if (pid < 0)
1046                        return;
1047                if (waitpid(pid, &status, 0) < 0)
1048                        status = 255;
1049                exit(status);
1050        }
1051}
1052
1053int mingw_execvp(const char *cmd, char *const *argv)
1054{
1055        char **path = get_path_split();
1056        char *prog = path_lookup(cmd, path, 0);
1057
1058        if (prog) {
1059                mingw_execve(prog, argv, environ);
1060                free(prog);
1061        } else
1062                errno = ENOENT;
1063
1064        free_path_split(path);
1065        return -1;
1066}
1067
1068int mingw_execv(const char *cmd, char *const *argv)
1069{
1070        mingw_execve(cmd, argv, environ);
1071        return -1;
1072}
1073
1074int mingw_kill(pid_t pid, int sig)
1075{
1076        if (pid > 0 && sig == SIGTERM) {
1077                HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1078
1079                if (TerminateProcess(h, -1)) {
1080                        CloseHandle(h);
1081                        return 0;
1082                }
1083
1084                errno = err_win_to_posix(GetLastError());
1085                CloseHandle(h);
1086                return -1;
1087        }
1088
1089        errno = EINVAL;
1090        return -1;
1091}
1092
1093static char **copy_environ(void)
1094{
1095        char **env;
1096        int i = 0;
1097        while (environ[i])
1098                i++;
1099        env = xmalloc((i+1)*sizeof(*env));
1100        for (i = 0; environ[i]; i++)
1101                env[i] = xstrdup(environ[i]);
1102        env[i] = NULL;
1103        return env;
1104}
1105
1106void free_environ(char **env)
1107{
1108        int i;
1109        for (i = 0; env[i]; i++)
1110                free(env[i]);
1111        free(env);
1112}
1113
1114static int lookup_env(char **env, const char *name, size_t nmln)
1115{
1116        int i;
1117
1118        for (i = 0; env[i]; i++) {
1119                if (0 == strncmp(env[i], name, nmln)
1120                    && '=' == env[i][nmln])
1121                        /* matches */
1122                        return i;
1123        }
1124        return -1;
1125}
1126
1127/*
1128 * If name contains '=', then sets the variable, otherwise it unsets it
1129 */
1130static char **env_setenv(char **env, const char *name)
1131{
1132        char *eq = strchrnul(name, '=');
1133        int i = lookup_env(env, name, eq-name);
1134
1135        if (i < 0) {
1136                if (*eq) {
1137                        for (i = 0; env[i]; i++)
1138                                ;
1139                        env = xrealloc(env, (i+2)*sizeof(*env));
1140                        env[i] = xstrdup(name);
1141                        env[i+1] = NULL;
1142                }
1143        }
1144        else {
1145                free(env[i]);
1146                if (*eq)
1147                        env[i] = xstrdup(name);
1148                else
1149                        for (; env[i]; i++)
1150                                env[i] = env[i+1];
1151        }
1152        return env;
1153}
1154
1155/*
1156 * Copies global environ and adjusts variables as specified by vars.
1157 */
1158char **make_augmented_environ(const char *const *vars)
1159{
1160        char **env = copy_environ();
1161
1162        while (*vars)
1163                env = env_setenv(env, *vars++);
1164        return env;
1165}
1166
1167#undef getenv
1168
1169/*
1170 * The system's getenv looks up the name in a case-insensitive manner.
1171 * This version tries a case-sensitive lookup and falls back to
1172 * case-insensitive if nothing was found.  This is necessary because,
1173 * as a prominent example, CMD sets 'Path', but not 'PATH'.
1174 * Warning: not thread-safe.
1175 */
1176static char *getenv_cs(const char *name)
1177{
1178        size_t len = strlen(name);
1179        int i = lookup_env(environ, name, len);
1180        if (i >= 0)
1181                return environ[i] + len + 1;    /* skip past name and '=' */
1182        return getenv(name);
1183}
1184
1185char *mingw_getenv(const char *name)
1186{
1187        char *result = getenv_cs(name);
1188        if (!result && !strcmp(name, "TMPDIR")) {
1189                /* on Windows it is TMP and TEMP */
1190                result = getenv_cs("TMP");
1191                if (!result)
1192                        result = getenv_cs("TEMP");
1193        }
1194        return result;
1195}
1196
1197/*
1198 * Note, this isn't a complete replacement for getaddrinfo. It assumes
1199 * that service contains a numerical port, or that it is null. It
1200 * does a simple search using gethostbyname, and returns one IPv4 host
1201 * if one was found.
1202 */
1203static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1204                                   const struct addrinfo *hints,
1205                                   struct addrinfo **res)
1206{
1207        struct hostent *h = NULL;
1208        struct addrinfo *ai;
1209        struct sockaddr_in *sin;
1210
1211        if (node) {
1212                h = gethostbyname(node);
1213                if (!h)
1214                        return WSAGetLastError();
1215        }
1216
1217        ai = xmalloc(sizeof(struct addrinfo));
1218        *res = ai;
1219        ai->ai_flags = 0;
1220        ai->ai_family = AF_INET;
1221        ai->ai_socktype = hints ? hints->ai_socktype : 0;
1222        switch (ai->ai_socktype) {
1223        case SOCK_STREAM:
1224                ai->ai_protocol = IPPROTO_TCP;
1225                break;
1226        case SOCK_DGRAM:
1227                ai->ai_protocol = IPPROTO_UDP;
1228                break;
1229        default:
1230                ai->ai_protocol = 0;
1231                break;
1232        }
1233        ai->ai_addrlen = sizeof(struct sockaddr_in);
1234        if (hints && (hints->ai_flags & AI_CANONNAME))
1235                ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1236        else
1237                ai->ai_canonname = NULL;
1238
1239        sin = xmalloc(ai->ai_addrlen);
1240        memset(sin, 0, ai->ai_addrlen);
1241        sin->sin_family = AF_INET;
1242        /* Note: getaddrinfo is supposed to allow service to be a string,
1243         * which should be looked up using getservbyname. This is
1244         * currently not implemented */
1245        if (service)
1246                sin->sin_port = htons(atoi(service));
1247        if (h)
1248                sin->sin_addr = *(struct in_addr *)h->h_addr;
1249        else if (hints && (hints->ai_flags & AI_PASSIVE))
1250                sin->sin_addr.s_addr = INADDR_ANY;
1251        else
1252                sin->sin_addr.s_addr = INADDR_LOOPBACK;
1253        ai->ai_addr = (struct sockaddr *)sin;
1254        ai->ai_next = 0;
1255        return 0;
1256}
1257
1258static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1259{
1260        free(res->ai_canonname);
1261        free(res->ai_addr);
1262        free(res);
1263}
1264
1265static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1266                                   char *host, DWORD hostlen,
1267                                   char *serv, DWORD servlen, int flags)
1268{
1269        const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1270        if (sa->sa_family != AF_INET)
1271                return EAI_FAMILY;
1272        if (!host && !serv)
1273                return EAI_NONAME;
1274
1275        if (host && hostlen > 0) {
1276                struct hostent *ent = NULL;
1277                if (!(flags & NI_NUMERICHOST))
1278                        ent = gethostbyaddr((const char *)&sin->sin_addr,
1279                                            sizeof(sin->sin_addr), AF_INET);
1280
1281                if (ent)
1282                        snprintf(host, hostlen, "%s", ent->h_name);
1283                else if (flags & NI_NAMEREQD)
1284                        return EAI_NONAME;
1285                else
1286                        snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1287        }
1288
1289        if (serv && servlen > 0) {
1290                struct servent *ent = NULL;
1291                if (!(flags & NI_NUMERICSERV))
1292                        ent = getservbyport(sin->sin_port,
1293                                            flags & NI_DGRAM ? "udp" : "tcp");
1294
1295                if (ent)
1296                        snprintf(serv, servlen, "%s", ent->s_name);
1297                else
1298                        snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1299        }
1300
1301        return 0;
1302}
1303
1304static HMODULE ipv6_dll = NULL;
1305static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1306static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1307                                      const struct addrinfo *hints,
1308                                      struct addrinfo **res);
1309static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1310                                      char *host, DWORD hostlen,
1311                                      char *serv, DWORD servlen, int flags);
1312/*
1313 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1314 * don't need to try to load that one dynamically.
1315 */
1316
1317static void socket_cleanup(void)
1318{
1319        WSACleanup();
1320        if (ipv6_dll)
1321                FreeLibrary(ipv6_dll);
1322        ipv6_dll = NULL;
1323        ipv6_freeaddrinfo = freeaddrinfo_stub;
1324        ipv6_getaddrinfo = getaddrinfo_stub;
1325        ipv6_getnameinfo = getnameinfo_stub;
1326}
1327
1328static void ensure_socket_initialization(void)
1329{
1330        WSADATA wsa;
1331        static int initialized = 0;
1332        const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1333        const char **name;
1334
1335        if (initialized)
1336                return;
1337
1338        if (WSAStartup(MAKEWORD(2,2), &wsa))
1339                die("unable to initialize winsock subsystem, error %d",
1340                        WSAGetLastError());
1341
1342        for (name = libraries; *name; name++) {
1343                ipv6_dll = LoadLibrary(*name);
1344                if (!ipv6_dll)
1345                        continue;
1346
1347                ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1348                        GetProcAddress(ipv6_dll, "freeaddrinfo");
1349                ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1350                                                   const struct addrinfo *,
1351                                                   struct addrinfo **))
1352                        GetProcAddress(ipv6_dll, "getaddrinfo");
1353                ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1354                                                   socklen_t, char *, DWORD,
1355                                                   char *, DWORD, int))
1356                        GetProcAddress(ipv6_dll, "getnameinfo");
1357                if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1358                        FreeLibrary(ipv6_dll);
1359                        ipv6_dll = NULL;
1360                } else
1361                        break;
1362        }
1363        if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1364                ipv6_freeaddrinfo = freeaddrinfo_stub;
1365                ipv6_getaddrinfo = getaddrinfo_stub;
1366                ipv6_getnameinfo = getnameinfo_stub;
1367        }
1368
1369        atexit(socket_cleanup);
1370        initialized = 1;
1371}
1372
1373#undef gethostname
1374int mingw_gethostname(char *name, int namelen)
1375{
1376    ensure_socket_initialization();
1377    return gethostname(name, namelen);
1378}
1379
1380#undef gethostbyname
1381struct hostent *mingw_gethostbyname(const char *host)
1382{
1383        ensure_socket_initialization();
1384        return gethostbyname(host);
1385}
1386
1387void mingw_freeaddrinfo(struct addrinfo *res)
1388{
1389        ipv6_freeaddrinfo(res);
1390}
1391
1392int mingw_getaddrinfo(const char *node, const char *service,
1393                      const struct addrinfo *hints, struct addrinfo **res)
1394{
1395        ensure_socket_initialization();
1396        return ipv6_getaddrinfo(node, service, hints, res);
1397}
1398
1399int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1400                      char *host, DWORD hostlen, char *serv, DWORD servlen,
1401                      int flags)
1402{
1403        ensure_socket_initialization();
1404        return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1405}
1406
1407int mingw_socket(int domain, int type, int protocol)
1408{
1409        int sockfd;
1410        SOCKET s;
1411
1412        ensure_socket_initialization();
1413        s = WSASocket(domain, type, protocol, NULL, 0, 0);
1414        if (s == INVALID_SOCKET) {
1415                /*
1416                 * WSAGetLastError() values are regular BSD error codes
1417                 * biased by WSABASEERR.
1418                 * However, strerror() does not know about networking
1419                 * specific errors, which are values beginning at 38 or so.
1420                 * Therefore, we choose to leave the biased error code
1421                 * in errno so that _if_ someone looks up the code somewhere,
1422                 * then it is at least the number that are usually listed.
1423                 */
1424                errno = WSAGetLastError();
1425                return -1;
1426        }
1427        /* convert into a file descriptor */
1428        if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1429                closesocket(s);
1430                return error("unable to make a socket file descriptor: %s",
1431                        strerror(errno));
1432        }
1433        return sockfd;
1434}
1435
1436#undef connect
1437int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1438{
1439        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1440        return connect(s, sa, sz);
1441}
1442
1443#undef bind
1444int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1445{
1446        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1447        return bind(s, sa, sz);
1448}
1449
1450#undef setsockopt
1451int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1452{
1453        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1454        return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1455}
1456
1457#undef shutdown
1458int mingw_shutdown(int sockfd, int how)
1459{
1460        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1461        return shutdown(s, how);
1462}
1463
1464#undef listen
1465int mingw_listen(int sockfd, int backlog)
1466{
1467        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1468        return listen(s, backlog);
1469}
1470
1471#undef accept
1472int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1473{
1474        int sockfd2;
1475
1476        SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1477        SOCKET s2 = accept(s1, sa, sz);
1478
1479        /* convert into a file descriptor */
1480        if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1481                int err = errno;
1482                closesocket(s2);
1483                return error("unable to make a socket file descriptor: %s",
1484                        strerror(err));
1485        }
1486        return sockfd2;
1487}
1488
1489#undef rename
1490int mingw_rename(const char *pold, const char *pnew)
1491{
1492        DWORD attrs, gle;
1493        int tries = 0;
1494
1495        /*
1496         * Try native rename() first to get errno right.
1497         * It is based on MoveFile(), which cannot overwrite existing files.
1498         */
1499        if (!rename(pold, pnew))
1500                return 0;
1501        if (errno != EEXIST)
1502                return -1;
1503repeat:
1504        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1505                return 0;
1506        /* TODO: translate more errors */
1507        gle = GetLastError();
1508        if (gle == ERROR_ACCESS_DENIED &&
1509            (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1510                if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1511                        errno = EISDIR;
1512                        return -1;
1513                }
1514                if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1515                    SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1516                        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1517                                return 0;
1518                        gle = GetLastError();
1519                        /* revert file attributes on failure */
1520                        SetFileAttributes(pnew, attrs);
1521                }
1522        }
1523        if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1524                /*
1525                 * We assume that some other process had the source or
1526                 * destination file open at the wrong moment and retry.
1527                 * In order to give the other process a higher chance to
1528                 * complete its operation, we give up our time slice now.
1529                 * If we have to retry again, we do sleep a bit.
1530                 */
1531                Sleep(delay[tries]);
1532                tries++;
1533                goto repeat;
1534        }
1535        if (gle == ERROR_ACCESS_DENIED &&
1536               ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1537                       "Should I try again?", pold, pnew))
1538                goto repeat;
1539
1540        errno = EACCES;
1541        return -1;
1542}
1543
1544/*
1545 * Note that this doesn't return the actual pagesize, but
1546 * the allocation granularity. If future Windows specific git code
1547 * needs the real getpagesize function, we need to find another solution.
1548 */
1549int mingw_getpagesize(void)
1550{
1551        SYSTEM_INFO si;
1552        GetSystemInfo(&si);
1553        return si.dwAllocationGranularity;
1554}
1555
1556struct passwd *getpwuid(int uid)
1557{
1558        static char user_name[100];
1559        static struct passwd p;
1560
1561        DWORD len = sizeof(user_name);
1562        if (!GetUserName(user_name, &len))
1563                return NULL;
1564        p.pw_name = user_name;
1565        p.pw_gecos = "unknown";
1566        p.pw_dir = NULL;
1567        return &p;
1568}
1569
1570static HANDLE timer_event;
1571static HANDLE timer_thread;
1572static int timer_interval;
1573static int one_shot;
1574static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1575
1576/* The timer works like this:
1577 * The thread, ticktack(), is a trivial routine that most of the time
1578 * only waits to receive the signal to terminate. The main thread tells
1579 * the thread to terminate by setting the timer_event to the signalled
1580 * state.
1581 * But ticktack() interrupts the wait state after the timer's interval
1582 * length to call the signal handler.
1583 */
1584
1585static unsigned __stdcall ticktack(void *dummy)
1586{
1587        while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1588                mingw_raise(SIGALRM);
1589                if (one_shot)
1590                        break;
1591        }
1592        return 0;
1593}
1594
1595static int start_timer_thread(void)
1596{
1597        timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1598        if (timer_event) {
1599                timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1600                if (!timer_thread )
1601                        return errno = ENOMEM,
1602                                error("cannot start timer thread");
1603        } else
1604                return errno = ENOMEM,
1605                        error("cannot allocate resources for timer");
1606        return 0;
1607}
1608
1609static void stop_timer_thread(void)
1610{
1611        if (timer_event)
1612                SetEvent(timer_event);  /* tell thread to terminate */
1613        if (timer_thread) {
1614                int rc = WaitForSingleObject(timer_thread, 1000);
1615                if (rc == WAIT_TIMEOUT)
1616                        error("timer thread did not terminate timely");
1617                else if (rc != WAIT_OBJECT_0)
1618                        error("waiting for timer thread failed: %lu",
1619                              GetLastError());
1620                CloseHandle(timer_thread);
1621        }
1622        if (timer_event)
1623                CloseHandle(timer_event);
1624        timer_event = NULL;
1625        timer_thread = NULL;
1626}
1627
1628static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1629{
1630        return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1631}
1632
1633int setitimer(int type, struct itimerval *in, struct itimerval *out)
1634{
1635        static const struct timeval zero;
1636        static int atexit_done;
1637
1638        if (out != NULL)
1639                return errno = EINVAL,
1640                        error("setitimer param 3 != NULL not implemented");
1641        if (!is_timeval_eq(&in->it_interval, &zero) &&
1642            !is_timeval_eq(&in->it_interval, &in->it_value))
1643                return errno = EINVAL,
1644                        error("setitimer: it_interval must be zero or eq it_value");
1645
1646        if (timer_thread)
1647                stop_timer_thread();
1648
1649        if (is_timeval_eq(&in->it_value, &zero) &&
1650            is_timeval_eq(&in->it_interval, &zero))
1651                return 0;
1652
1653        timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1654        one_shot = is_timeval_eq(&in->it_interval, &zero);
1655        if (!atexit_done) {
1656                atexit(stop_timer_thread);
1657                atexit_done = 1;
1658        }
1659        return start_timer_thread();
1660}
1661
1662int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1663{
1664        if (sig != SIGALRM)
1665                return errno = EINVAL,
1666                        error("sigaction only implemented for SIGALRM");
1667        if (out != NULL)
1668                return errno = EINVAL,
1669                        error("sigaction: param 3 != NULL not implemented");
1670
1671        timer_fn = in->sa_handler;
1672        return 0;
1673}
1674
1675#undef signal
1676sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1677{
1678        sig_handler_t old = timer_fn;
1679
1680        switch (sig) {
1681        case SIGALRM:
1682                timer_fn = handler;
1683                break;
1684
1685        case SIGINT:
1686                sigint_fn = handler;
1687                break;
1688
1689        default:
1690                return signal(sig, handler);
1691        }
1692
1693        return old;
1694}
1695
1696#undef raise
1697int mingw_raise(int sig)
1698{
1699        switch (sig) {
1700        case SIGALRM:
1701                if (timer_fn == SIG_DFL) {
1702                        if (isatty(STDERR_FILENO))
1703                                fputs("Alarm clock\n", stderr);
1704                        exit(128 + SIGALRM);
1705                } else if (timer_fn != SIG_IGN)
1706                        timer_fn(SIGALRM);
1707                return 0;
1708
1709        case SIGINT:
1710                if (sigint_fn == SIG_DFL)
1711                        exit(128 + SIGINT);
1712                else if (sigint_fn != SIG_IGN)
1713                        sigint_fn(SIGINT);
1714                return 0;
1715
1716        default:
1717                return raise(sig);
1718        }
1719}
1720
1721
1722static const char *make_backslash_path(const char *path)
1723{
1724        static char buf[PATH_MAX + 1];
1725        char *c;
1726
1727        if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1728                die("Too long path: %.*s", 60, path);
1729
1730        for (c = buf; *c; c++) {
1731                if (*c == '/')
1732                        *c = '\\';
1733        }
1734        return buf;
1735}
1736
1737void mingw_open_html(const char *unixpath)
1738{
1739        const char *htmlpath = make_backslash_path(unixpath);
1740        typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1741                        const char *, const char *, const char *, INT);
1742        T ShellExecute;
1743        HMODULE shell32;
1744        int r;
1745
1746        shell32 = LoadLibrary("shell32.dll");
1747        if (!shell32)
1748                die("cannot load shell32.dll");
1749        ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1750        if (!ShellExecute)
1751                die("cannot run browser");
1752
1753        printf("Launching default browser to display HTML ...\n");
1754        r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1755        FreeLibrary(shell32);
1756        /* see the MSDN documentation referring to the result codes here */
1757        if (r <= 32) {
1758                die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1759        }
1760}
1761
1762int link(const char *oldpath, const char *newpath)
1763{
1764        typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1765        static T create_hard_link = NULL;
1766        if (!create_hard_link) {
1767                create_hard_link = (T) GetProcAddress(
1768                        GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1769                if (!create_hard_link)
1770                        create_hard_link = (T)-1;
1771        }
1772        if (create_hard_link == (T)-1) {
1773                errno = ENOSYS;
1774                return -1;
1775        }
1776        if (!create_hard_link(newpath, oldpath, NULL)) {
1777                errno = err_win_to_posix(GetLastError());
1778                return -1;
1779        }
1780        return 0;
1781}
1782
1783char *getpass(const char *prompt)
1784{
1785        struct strbuf buf = STRBUF_INIT;
1786
1787        fputs(prompt, stderr);
1788        for (;;) {
1789                char c = _getch();
1790                if (c == '\r' || c == '\n')
1791                        break;
1792                strbuf_addch(&buf, c);
1793        }
1794        fputs("\n", stderr);
1795        return strbuf_detach(&buf, NULL);
1796}
1797
1798pid_t waitpid(pid_t pid, int *status, int options)
1799{
1800        HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1801            FALSE, pid);
1802        if (!h) {
1803                errno = ECHILD;
1804                return -1;
1805        }
1806
1807        if (pid > 0 && options & WNOHANG) {
1808                if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1809                        CloseHandle(h);
1810                        return 0;
1811                }
1812                options &= ~WNOHANG;
1813        }
1814
1815        if (options == 0) {
1816                struct pinfo_t **ppinfo;
1817                if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1818                        CloseHandle(h);
1819                        return 0;
1820                }
1821
1822                if (status)
1823                        GetExitCodeProcess(h, (LPDWORD)status);
1824
1825                EnterCriticalSection(&pinfo_cs);
1826
1827                ppinfo = &pinfo;
1828                while (*ppinfo) {
1829                        struct pinfo_t *info = *ppinfo;
1830                        if (info->pid == pid) {
1831                                CloseHandle(info->proc);
1832                                *ppinfo = info->next;
1833                                free(info);
1834                                break;
1835                        }
1836                        ppinfo = &info->next;
1837                }
1838
1839                LeaveCriticalSection(&pinfo_cs);
1840
1841                CloseHandle(h);
1842                return pid;
1843        }
1844        CloseHandle(h);
1845
1846        errno = EINVAL;
1847        return -1;
1848}