compat/mingw.c

   1 #include "../git-compat-util.h"
   2 #include "win32.h"
   3 #include <conio.h>
   4 #include "../strbuf.h"
   5 #include "../cache.h"
   6
   7 unsigned int _CRT_fmode = _O_BINARY;
   8
   9 int 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
 122 static int make_hidden(const char *path)
 123 {
 124         DWORD attribs = GetFileAttributes(path);
 125         if (SetFileAttributes(path, FILE_ATTRIBUTE_HIDDEN | attribs))
 126                 return 0;
 127         errno = err_win_to_posix(GetLastError());
 128         return -1;
 129 }
 130
 131 void mingw_mark_as_git_dir(const char *dir)
 132 {
 133         if (hide_dotfiles != HIDE_DOTFILES_FALSE && make_hidden(dir))
 134                 warning("Failed to make '%s' hidden", dir);
 135 }
 136
 137 #undef mkdir
 138 int mingw_mkdir(const char *path, int mode)
 139 {
 140         int ret = mkdir(path);
 141         if (!ret && hide_dotfiles == HIDE_DOTFILES_TRUE) {
 142                 /*
 143                  * In Windows a file or dir starting with a dot is not
 144                  * automatically hidden. So lets mark it as hidden when
 145                  * such a directory is created.
 146                  */
 147                 const char *start = basename((char*)path);
 148                 if (*start == '.')
 149                         return make_hidden(path);
 150         }
 151         return ret;
 152 }
 153
 154 #undef open
 155 int mingw_open (const char *filename, int oflags, ...)
 156 {
 157         va_list args;
 158         unsigned mode;
 159         int fd;
 160
 161         va_start(args, oflags);
 162         mode = va_arg(args, int);
 163         va_end(args);
 164
 165         if (filename && !strcmp(filename, "/dev/null"))
 166                 filename = "nul";
 167
 168         fd = open(filename, oflags, mode);
 169
 170         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 171                 DWORD attrs = GetFileAttributes(filename);
 172                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 173                         errno = EISDIR;
 174         }
 175         if ((oflags & O_CREAT) && fd >= 0 &&
 176             hide_dotfiles == HIDE_DOTFILES_TRUE) {
 177                 /*
 178                  * In Windows a file or dir starting with a dot is not
 179                  * automatically hidden. So lets mark it as hidden when
 180                  * such a file is created.
 181                  */
 182                 const char *start = basename((char*)filename);
 183                 if (*start == '.' && make_hidden(filename))
 184                         warning("Could not mark '%s' as hidden.", filename);
 185         }
 186         return fd;
 187 }
 188
 189 #undef write
 190 ssize_t mingw_write(int fd, const void *buf, size_t count)
 191 {
 192         /*
 193          * While write() calls to a file on a local disk are translated
 194          * into WriteFile() calls with a maximum size of 64KB on Windows
 195          * XP and 256KB on Vista, no such cap is placed on writes to
 196          * files over the network on Windows XP.  Unfortunately, there
 197          * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 198          * bigger writes fail on Windows XP.
 199          * So we cap to a nice 31MB here to avoid write failures over
 200          * the net without changing the number of WriteFile() calls in
 201          * the local case.
 202          */
 203         return write(fd, buf, min(count, 31 * 1024 * 1024));
 204 }
 205
 206 #undef fopen
 207 FILE *mingw_fopen (const char *filename, const char *otype)
 208 {
 209         int hide = 0;
 210         FILE *file;
 211         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 212             basename((char*)filename)[0] == '.')
 213                 hide = access(filename, F_OK);
 214         if (filename && !strcmp(filename, "/dev/null"))
 215                 filename = "nul";
 216         file = fopen(filename, otype);
 217         if (file && hide && make_hidden(filename))
 218                 warning("Could not mark '%s' as hidden.", filename);
 219         return file;
 220 }
 221
 222 #undef freopen
 223 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 224 {
 225         int hide = 0;
 226         FILE *file;
 227         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 228             basename((char*)filename)[0] == '.')
 229                 hide = access(filename, F_OK);
 230         if (filename && !strcmp(filename, "/dev/null"))
 231                 filename = "nul";
 232         file = freopen(filename, otype, stream);
 233         if (file && hide && make_hidden(filename))
 234                 warning("Could not mark '%s' as hidden.", filename);
 235         return file;
 236 }
 237
 238 /*
 239  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 240  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 241  */
 242 static inline long long filetime_to_hnsec(const FILETIME *ft)
 243 {
 244         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 245         /* Windows to Unix Epoch conversion */
 246         return winTime - 116444736000000000LL;
 247 }
 248
 249 static inline time_t filetime_to_time_t(const FILETIME *ft)
 250 {
 251         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 252 }
 253
 254 /* We keep the do_lstat code in a separate function to avoid recursion.
 255  * When a path ends with a slash, the stat will fail with ENOENT. In
 256  * this case, we strip the trailing slashes and stat again.
 257  *
 258  * If follow is true then act like stat() and report on the link
 259  * target. Otherwise report on the link itself.
 260  */
 261 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 262 {
 263         WIN32_FILE_ATTRIBUTE_DATA fdata;
 264
 265         if (!(errno = get_file_attr(file_name, &fdata))) {
 266                 buf->st_ino = 0;
 267                 buf->st_gid = 0;
 268                 buf->st_uid = 0;
 269                 buf->st_nlink = 1;
 270                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 271                 buf->st_size = fdata.nFileSizeLow |
 272                         (((off_t)fdata.nFileSizeHigh)<<32);
 273                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 274                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 275                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 276                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 277                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 278                         WIN32_FIND_DATAA findbuf;
 279                         HANDLE handle = FindFirstFileA(file_name, &findbuf);
 280                         if (handle != INVALID_HANDLE_VALUE) {
 281                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 282                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 283                                         if (follow) {
 284                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 285                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 286                                         } else {
 287                                                 buf->st_mode = S_IFLNK;
 288                                         }
 289                                         buf->st_mode |= S_IREAD;
 290                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 291                                                 buf->st_mode |= S_IWRITE;
 292                                 }
 293                                 FindClose(handle);
 294                         }
 295                 }
 296                 return 0;
 297         }
 298         return -1;
 299 }
 300
 301 /* We provide our own lstat/fstat functions, since the provided
 302  * lstat/fstat functions are so slow. These stat functions are
 303  * tailored for Git's usage (read: fast), and are not meant to be
 304  * complete. Note that Git stat()s are redirected to mingw_lstat()
 305  * too, since Windows doesn't really handle symlinks that well.
 306  */
 307 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 308 {
 309         int namelen;
 310         static char alt_name[PATH_MAX];
 311
 312         if (!do_lstat(follow, file_name, buf))
 313                 return 0;
 314
 315         /* if file_name ended in a '/', Windows returned ENOENT;
 316          * try again without trailing slashes
 317          */
 318         if (errno != ENOENT)
 319                 return -1;
 320
 321         namelen = strlen(file_name);
 322         if (namelen && file_name[namelen-1] != '/')
 323                 return -1;
 324         while (namelen && file_name[namelen-1] == '/')
 325                 --namelen;
 326         if (!namelen || namelen >= PATH_MAX)
 327                 return -1;
 328
 329         memcpy(alt_name, file_name, namelen);
 330         alt_name[namelen] = 0;
 331         return do_lstat(follow, alt_name, buf);
 332 }
 333
 334 int mingw_lstat(const char *file_name, struct stat *buf)
 335 {
 336         return do_stat_internal(0, file_name, buf);
 337 }
 338 int mingw_stat(const char *file_name, struct stat *buf)
 339 {
 340         return do_stat_internal(1, file_name, buf);
 341 }
 342
 343 #undef fstat
 344 int mingw_fstat(int fd, struct stat *buf)
 345 {
 346         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 347         BY_HANDLE_FILE_INFORMATION fdata;
 348
 349         if (fh == INVALID_HANDLE_VALUE) {
 350                 errno = EBADF;
 351                 return -1;
 352         }
 353         /* direct non-file handles to MS's fstat() */
 354         if (GetFileType(fh) != FILE_TYPE_DISK)
 355                 return _fstati64(fd, buf);
 356
 357         if (GetFileInformationByHandle(fh, &fdata)) {
 358                 buf->st_ino = 0;
 359                 buf->st_gid = 0;
 360                 buf->st_uid = 0;
 361                 buf->st_nlink = 1;
 362                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 363                 buf->st_size = fdata.nFileSizeLow |
 364                         (((off_t)fdata.nFileSizeHigh)<<32);
 365                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 366                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 367                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 368                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 369                 return 0;
 370         }
 371         errno = EBADF;
 372         return -1;
 373 }
 374
 375 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 376 {
 377         long long winTime = t * 10000000LL + 116444736000000000LL;
 378         ft->dwLowDateTime = winTime;
 379         ft->dwHighDateTime = winTime >> 32;
 380 }
 381
 382 int mingw_utime (const char *file_name, const struct utimbuf *times)
 383 {
 384         FILETIME mft, aft;
 385         int fh, rc;
 386
 387         /* must have write permission */
 388         DWORD attrs = GetFileAttributes(file_name);
 389         if (attrs != INVALID_FILE_ATTRIBUTES &&
 390             (attrs & FILE_ATTRIBUTE_READONLY)) {
 391                 /* ignore errors here; open() will report them */
 392                 SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 393         }
 394
 395         if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 396                 rc = -1;
 397                 goto revert_attrs;
 398         }
 399
 400         if (times) {
 401                 time_t_to_filetime(times->modtime, &mft);
 402                 time_t_to_filetime(times->actime, &aft);
 403         } else {
 404                 GetSystemTimeAsFileTime(&mft);
 405                 aft = mft;
 406         }
 407         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 408                 errno = EINVAL;
 409                 rc = -1;
 410         } else
 411                 rc = 0;
 412         close(fh);
 413
 414 revert_attrs:
 415         if (attrs != INVALID_FILE_ATTRIBUTES &&
 416             (attrs & FILE_ATTRIBUTE_READONLY)) {
 417                 /* ignore errors again */
 418                 SetFileAttributes(file_name, attrs);
 419         }
 420         return rc;
 421 }
 422
 423 unsigned int sleep (unsigned int seconds)
 424 {
 425         Sleep(seconds*1000);
 426         return 0;
 427 }
 428
 429 int mkstemp(char *template)
 430 {
 431         char *filename = mktemp(template);
 432         if (filename == NULL)
 433                 return -1;
 434         return open(filename, O_RDWR | O_CREAT, 0600);
 435 }
 436
 437 int gettimeofday(struct timeval *tv, void *tz)
 438 {
 439         FILETIME ft;
 440         long long hnsec;
 441
 442         GetSystemTimeAsFileTime(&ft);
 443         hnsec = filetime_to_hnsec(&ft);
 444         tv->tv_sec = hnsec / 10000000;
 445         tv->tv_usec = (hnsec % 10000000) / 10;
 446         return 0;
 447 }
 448
 449 int pipe(int filedes[2])
 450 {
 451         HANDLE h[2];
 452
 453         /* this creates non-inheritable handles */
 454         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 455                 errno = err_win_to_posix(GetLastError());
 456                 return -1;
 457         }
 458         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 459         if (filedes[0] < 0) {
 460                 CloseHandle(h[0]);
 461                 CloseHandle(h[1]);
 462                 return -1;
 463         }
 464         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 465         if (filedes[0] < 0) {
 466                 close(filedes[0]);
 467                 CloseHandle(h[1]);
 468                 return -1;
 469         }
 470         return 0;
 471 }
 472
 473 int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 474 {
 475         int i, pending;
 476
 477         if (timeout >= 0) {
 478                 if (nfds == 0) {
 479                         Sleep(timeout);
 480                         return 0;
 481                 }
 482                 return errno = EINVAL, error("poll timeout not supported");
 483         }
 484
 485         /* When there is only one fd to wait for, then we pretend that
 486          * input is available and let the actual wait happen when the
 487          * caller invokes read().
 488          */
 489         if (nfds == 1) {
 490                 if (!(ufds[0].events & POLLIN))
 491                         return errno = EINVAL, error("POLLIN not set");
 492                 ufds[0].revents = POLLIN;
 493                 return 0;
 494         }
 495
 496 repeat:
 497         pending = 0;
 498         for (i = 0; i < nfds; i++) {
 499                 DWORD avail = 0;
 500                 HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 501                 if (h == INVALID_HANDLE_VALUE)
 502                         return -1;      /* errno was set */
 503
 504                 if (!(ufds[i].events & POLLIN))
 505                         return errno = EINVAL, error("POLLIN not set");
 506
 507                 /* this emulation works only for pipes */
 508                 if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 509                         int err = GetLastError();
 510                         if (err == ERROR_BROKEN_PIPE) {
 511                                 ufds[i].revents = POLLHUP;
 512                                 pending++;
 513                         } else {
 514                                 errno = EINVAL;
 515                                 return error("PeekNamedPipe failed,"
 516                                         " GetLastError: %u", err);
 517                         }
 518                 } else if (avail) {
 519                         ufds[i].revents = POLLIN;
 520                         pending++;
 521                 } else
 522                         ufds[i].revents = 0;
 523         }
 524         if (!pending) {
 525                 /* The only times that we spin here is when the process
 526                  * that is connected through the pipes is waiting for
 527                  * its own input data to become available. But since
 528                  * the process (pack-objects) is itself CPU intensive,
 529                  * it will happily pick up the time slice that we are
 530                  * relinquishing here.
 531                  */
 532                 Sleep(0);
 533                 goto repeat;
 534         }
 535         return 0;
 536 }
 537
 538 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 539 {
 540         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 541         memcpy(result, gmtime(timep), sizeof(struct tm));
 542         return result;
 543 }
 544
 545 struct tm *localtime_r(const time_t *timep, struct tm *result)
 546 {
 547         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 548         memcpy(result, localtime(timep), sizeof(struct tm));
 549         return result;
 550 }
 551
 552 #undef getcwd
 553 char *mingw_getcwd(char *pointer, int len)
 554 {
 555         int i;
 556         char *ret = getcwd(pointer, len);
 557         if (!ret)
 558                 return ret;
 559         for (i = 0; pointer[i]; i++)
 560                 if (pointer[i] == '\\')
 561                         pointer[i] = '/';
 562         return ret;
 563 }
 564
 565 #undef getenv
 566 char *mingw_getenv(const char *name)
 567 {
 568         char *result = getenv(name);
 569         if (!result && !strcmp(name, "TMPDIR")) {
 570                 /* on Windows it is TMP and TEMP */
 571                 result = getenv("TMP");
 572                 if (!result)
 573                         result = getenv("TEMP");
 574         }
 575         return result;
 576 }
 577
 578 /*
 579  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 580  * (Parsing C++ Command-Line Arguments)
 581  */
 582 static const char *quote_arg(const char *arg)
 583 {
 584         /* count chars to quote */
 585         int len = 0, n = 0;
 586         int force_quotes = 0;
 587         char *q, *d;
 588         const char *p = arg;
 589         if (!*p) force_quotes = 1;
 590         while (*p) {
 591                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 592                         force_quotes = 1;
 593                 else if (*p == '"')
 594                         n++;
 595                 else if (*p == '\\') {
 596                         int count = 0;
 597                         while (*p == '\\') {
 598                                 count++;
 599                                 p++;
 600                                 len++;
 601                         }
 602                         if (*p == '"')
 603                                 n += count*2 + 1;
 604                         continue;
 605                 }
 606                 len++;
 607                 p++;
 608         }
 609         if (!force_quotes && n == 0)
 610                 return arg;
 611
 612         /* insert \ where necessary */
 613         d = q = xmalloc(len+n+3);
 614         *d++ = '"';
 615         while (*arg) {
 616                 if (*arg == '"')
 617                         *d++ = '\\';
 618                 else if (*arg == '\\') {
 619                         int count = 0;
 620                         while (*arg == '\\') {
 621                                 count++;
 622                                 *d++ = *arg++;
 623                         }
 624                         if (*arg == '"') {
 625                                 while (count-- > 0)
 626                                         *d++ = '\\';
 627                                 *d++ = '\\';
 628                         }
 629                 }
 630                 *d++ = *arg++;
 631         }
 632         *d++ = '"';
 633         *d++ = 0;
 634         return q;
 635 }
 636
 637 static const char *parse_interpreter(const char *cmd)
 638 {
 639         static char buf[100];
 640         char *p, *opt;
 641         int n, fd;
 642
 643         /* don't even try a .exe */
 644         n = strlen(cmd);
 645         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 646                 return NULL;
 647
 648         fd = open(cmd, O_RDONLY);
 649         if (fd < 0)
 650                 return NULL;
 651         n = read(fd, buf, sizeof(buf)-1);
 652         close(fd);
 653         if (n < 4)      /* at least '#!/x' and not error */
 654                 return NULL;
 655
 656         if (buf[0] != '#' || buf[1] != '!')
 657                 return NULL;
 658         buf[n] = '\0';
 659         p = buf + strcspn(buf, "\r\n");
 660         if (!*p)
 661                 return NULL;
 662
 663         *p = '\0';
 664         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 665                 return NULL;
 666         /* strip options */
 667         if ((opt = strchr(p+1, ' ')))
 668                 *opt = '\0';
 669         return p+1;
 670 }
 671
 672 /*
 673  * Splits the PATH into parts.
 674  */
 675 static char **get_path_split(void)
 676 {
 677         char *p, **path, *envpath = getenv("PATH");
 678         int i, n = 0;
 679
 680         if (!envpath || !*envpath)
 681                 return NULL;
 682
 683         envpath = xstrdup(envpath);
 684         p = envpath;
 685         while (p) {
 686                 char *dir = p;
 687                 p = strchr(p, ';');
 688                 if (p) *p++ = '\0';
 689                 if (*dir) {     /* not earlier, catches series of ; */
 690                         ++n;
 691                 }
 692         }
 693         if (!n)
 694                 return NULL;
 695
 696         path = xmalloc((n+1)*sizeof(char *));
 697         p = envpath;
 698         i = 0;
 699         do {
 700                 if (*p)
 701                         path[i++] = xstrdup(p);
 702                 p = p+strlen(p)+1;
 703         } while (i < n);
 704         path[i] = NULL;
 705
 706         free(envpath);
 707
 708         return path;
 709 }
 710
 711 static void free_path_split(char **path)
 712 {
 713         char **p = path;
 714
 715         if (!path)
 716                 return;
 717
 718         while (*p)
 719                 free(*p++);
 720         free(path);
 721 }
 722
 723 /*
 724  * exe_only means that we only want to detect .exe files, but not scripts
 725  * (which do not have an extension)
 726  */
 727 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 728 {
 729         char path[MAX_PATH];
 730         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 731
 732         if (!isexe && access(path, F_OK) == 0)
 733                 return xstrdup(path);
 734         path[strlen(path)-4] = '\0';
 735         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 736                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 737                         return xstrdup(path);
 738         return NULL;
 739 }
 740
 741 /*
 742  * Determines the absolute path of cmd using the split path in path.
 743  * If cmd contains a slash or backslash, no lookup is performed.
 744  */
 745 static char *path_lookup(const char *cmd, char **path, int exe_only)
 746 {
 747         char *prog = NULL;
 748         int len = strlen(cmd);
 749         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 750
 751         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 752                 prog = xstrdup(cmd);
 753
 754         while (!prog && *path)
 755                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 756
 757         return prog;
 758 }
 759
 760 static int env_compare(const void *a, const void *b)
 761 {
 762         char *const *ea = a;
 763         char *const *eb = b;
 764         return strcasecmp(*ea, *eb);
 765 }
 766
 767 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 768                               const char *dir,
 769                               int prepend_cmd, int fhin, int fhout, int fherr)
 770 {
 771         STARTUPINFO si;
 772         PROCESS_INFORMATION pi;
 773         struct strbuf envblk, args;
 774         unsigned flags;
 775         BOOL ret;
 776
 777         /* Determine whether or not we are associated to a console */
 778         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 779                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 780                         FILE_ATTRIBUTE_NORMAL, NULL);
 781         if (cons == INVALID_HANDLE_VALUE) {
 782                 /* There is no console associated with this process.
 783                  * Since the child is a console process, Windows
 784                  * would normally create a console window. But
 785                  * since we'll be redirecting std streams, we do
 786                  * not need the console.
 787                  * It is necessary to use DETACHED_PROCESS
 788                  * instead of CREATE_NO_WINDOW to make ssh
 789                  * recognize that it has no console.
 790                  */
 791                 flags = DETACHED_PROCESS;
 792         } else {
 793                 /* There is already a console. If we specified
 794                  * DETACHED_PROCESS here, too, Windows would
 795                  * disassociate the child from the console.
 796                  * The same is true for CREATE_NO_WINDOW.
 797                  * Go figure!
 798                  */
 799                 flags = 0;
 800                 CloseHandle(cons);
 801         }
 802         memset(&si, 0, sizeof(si));
 803         si.cb = sizeof(si);
 804         si.dwFlags = STARTF_USESTDHANDLES;
 805         si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 806         si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 807         si.hStdError = (HANDLE) _get_osfhandle(fherr);
 808
 809         /* concatenate argv, quoting args as we go */
 810         strbuf_init(&args, 0);
 811         if (prepend_cmd) {
 812                 char *quoted = (char *)quote_arg(cmd);
 813                 strbuf_addstr(&args, quoted);
 814                 if (quoted != cmd)
 815                         free(quoted);
 816         }
 817         for (; *argv; argv++) {
 818                 char *quoted = (char *)quote_arg(*argv);
 819                 if (*args.buf)
 820                         strbuf_addch(&args, ' ');
 821                 strbuf_addstr(&args, quoted);
 822                 if (quoted != *argv)
 823                         free(quoted);
 824         }
 825
 826         if (env) {
 827                 int count = 0;
 828                 char **e, **sorted_env;
 829
 830                 for (e = env; *e; e++)
 831                         count++;
 832
 833                 /* environment must be sorted */
 834                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 835                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 836                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 837
 838                 strbuf_init(&envblk, 0);
 839                 for (e = sorted_env; *e; e++) {
 840                         strbuf_addstr(&envblk, *e);
 841                         strbuf_addch(&envblk, '\0');
 842                 }
 843                 free(sorted_env);
 844         }
 845
 846         memset(&pi, 0, sizeof(pi));
 847         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 848                 env ? envblk.buf : NULL, dir, &si, &pi);
 849
 850         if (env)
 851                 strbuf_release(&envblk);
 852         strbuf_release(&args);
 853
 854         if (!ret) {
 855                 errno = ENOENT;
 856                 return -1;
 857         }
 858         CloseHandle(pi.hThread);
 859         return (pid_t)pi.hProcess;
 860 }
 861
 862 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 863                            int prepend_cmd)
 864 {
 865         return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 866 }
 867
 868 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 869                      const char *dir,
 870                      int fhin, int fhout, int fherr)
 871 {
 872         pid_t pid;
 873         char **path = get_path_split();
 874         char *prog = path_lookup(cmd, path, 0);
 875
 876         if (!prog) {
 877                 errno = ENOENT;
 878                 pid = -1;
 879         }
 880         else {
 881                 const char *interpr = parse_interpreter(prog);
 882
 883                 if (interpr) {
 884                         const char *argv0 = argv[0];
 885                         char *iprog = path_lookup(interpr, path, 1);
 886                         argv[0] = prog;
 887                         if (!iprog) {
 888                                 errno = ENOENT;
 889                                 pid = -1;
 890                         }
 891                         else {
 892                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 893                                                        fhin, fhout, fherr);
 894                                 free(iprog);
 895                         }
 896                         argv[0] = argv0;
 897                 }
 898                 else
 899                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
 900                                                fhin, fhout, fherr);
 901                 free(prog);
 902         }
 903         free_path_split(path);
 904         return pid;
 905 }
 906
 907 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 908 {
 909         const char *interpr = parse_interpreter(cmd);
 910         char **path;
 911         char *prog;
 912         int pid = 0;
 913
 914         if (!interpr)
 915                 return 0;
 916         path = get_path_split();
 917         prog = path_lookup(interpr, path, 1);
 918         if (prog) {
 919                 int argc = 0;
 920                 const char **argv2;
 921                 while (argv[argc]) argc++;
 922                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
 923                 argv2[0] = (char *)cmd; /* full path to the script file */
 924                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 925                 pid = mingw_spawnve(prog, argv2, env, 1);
 926                 if (pid >= 0) {
 927                         int status;
 928                         if (waitpid(pid, &status, 0) < 0)
 929                                 status = 255;
 930                         exit(status);
 931                 }
 932                 pid = 1;        /* indicate that we tried but failed */
 933                 free(prog);
 934                 free(argv2);
 935         }
 936         free_path_split(path);
 937         return pid;
 938 }
 939
 940 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 941 {
 942         /* check if git_command is a shell script */
 943         if (!try_shell_exec(cmd, argv, (char **)env)) {
 944                 int pid, status;
 945
 946                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 947                 if (pid < 0)
 948                         return;
 949                 if (waitpid(pid, &status, 0) < 0)
 950                         status = 255;
 951                 exit(status);
 952         }
 953 }
 954
 955 void mingw_execvp(const char *cmd, char *const *argv)
 956 {
 957         char **path = get_path_split();
 958         char *prog = path_lookup(cmd, path, 0);
 959
 960         if (prog) {
 961                 mingw_execve(prog, argv, environ);
 962                 free(prog);
 963         } else
 964                 errno = ENOENT;
 965
 966         free_path_split(path);
 967 }
 968
 969 static char **copy_environ(void)
 970 {
 971         char **env;
 972         int i = 0;
 973         while (environ[i])
 974                 i++;
 975         env = xmalloc((i+1)*sizeof(*env));
 976         for (i = 0; environ[i]; i++)
 977                 env[i] = xstrdup(environ[i]);
 978         env[i] = NULL;
 979         return env;
 980 }
 981
 982 void free_environ(char **env)
 983 {
 984         int i;
 985         for (i = 0; env[i]; i++)
 986                 free(env[i]);
 987         free(env);
 988 }
 989
 990 static int lookup_env(char **env, const char *name, size_t nmln)
 991 {
 992         int i;
 993
 994         for (i = 0; env[i]; i++) {
 995                 if (0 == strncmp(env[i], name, nmln)
 996                     && '=' == env[i][nmln])
 997                         /* matches */
 998                         return i;
 999         }
1000         return -1;
1001 }
1002
1003 /*
1004  * If name contains '=', then sets the variable, otherwise it unsets it
1005  */
1006 static char **env_setenv(char **env, const char *name)
1007 {
1008         char *eq = strchrnul(name, '=');
1009         int i = lookup_env(env, name, eq-name);
1010
1011         if (i < 0) {
1012                 if (*eq) {
1013                         for (i = 0; env[i]; i++)
1014                                 ;
1015                         env = xrealloc(env, (i+2)*sizeof(*env));
1016                         env[i] = xstrdup(name);
1017                         env[i+1] = NULL;
1018                 }
1019         }
1020         else {
1021                 free(env[i]);
1022                 if (*eq)
1023                         env[i] = xstrdup(name);
1024                 else
1025                         for (; env[i]; i++)
1026                                 env[i] = env[i+1];
1027         }
1028         return env;
1029 }
1030
1031 /*
1032  * Copies global environ and adjusts variables as specified by vars.
1033  */
1034 char **make_augmented_environ(const char *const *vars)
1035 {
1036         char **env = copy_environ();
1037
1038         while (*vars)
1039                 env = env_setenv(env, *vars++);
1040         return env;
1041 }
1042
1043 /*
1044  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1045  * that service contains a numerical port, or that it it is null. It
1046  * does a simple search using gethostbyname, and returns one IPv4 host
1047  * if one was found.
1048  */
1049 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1050                                    const struct addrinfo *hints,
1051                                    struct addrinfo **res)
1052 {
1053         struct hostent *h = gethostbyname(node);
1054         struct addrinfo *ai;
1055         struct sockaddr_in *sin;
1056
1057         if (!h)
1058                 return WSAGetLastError();
1059
1060         ai = xmalloc(sizeof(struct addrinfo));
1061         *res = ai;
1062         ai->ai_flags = 0;
1063         ai->ai_family = AF_INET;
1064         ai->ai_socktype = hints->ai_socktype;
1065         switch (hints->ai_socktype) {
1066         case SOCK_STREAM:
1067                 ai->ai_protocol = IPPROTO_TCP;
1068                 break;
1069         case SOCK_DGRAM:
1070                 ai->ai_protocol = IPPROTO_UDP;
1071                 break;
1072         default:
1073                 ai->ai_protocol = 0;
1074                 break;
1075         }
1076         ai->ai_addrlen = sizeof(struct sockaddr_in);
1077         ai->ai_canonname = strdup(h->h_name);
1078
1079         sin = xmalloc(ai->ai_addrlen);
1080         memset(sin, 0, ai->ai_addrlen);
1081         sin->sin_family = AF_INET;
1082         if (service)
1083                 sin->sin_port = htons(atoi(service));
1084         sin->sin_addr = *(struct in_addr *)h->h_addr;
1085         ai->ai_addr = (struct sockaddr *)sin;
1086         ai->ai_next = 0;
1087         return 0;
1088 }
1089
1090 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1091 {
1092         free(res->ai_canonname);
1093         free(res->ai_addr);
1094         free(res);
1095 }
1096
1097 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1098                                    char *host, DWORD hostlen,
1099                                    char *serv, DWORD servlen, int flags)
1100 {
1101         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1102         if (sa->sa_family != AF_INET)
1103                 return EAI_FAMILY;
1104         if (!host && !serv)
1105                 return EAI_NONAME;
1106
1107         if (host && hostlen > 0) {
1108                 struct hostent *ent = NULL;
1109                 if (!(flags & NI_NUMERICHOST))
1110                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1111                                             sizeof(sin->sin_addr), AF_INET);
1112
1113                 if (ent)
1114                         snprintf(host, hostlen, "%s", ent->h_name);
1115                 else if (flags & NI_NAMEREQD)
1116                         return EAI_NONAME;
1117                 else
1118                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1119         }
1120
1121         if (serv && servlen > 0) {
1122                 struct servent *ent = NULL;
1123                 if (!(flags & NI_NUMERICSERV))
1124                         ent = getservbyport(sin->sin_port,
1125                                             flags & NI_DGRAM ? "udp" : "tcp");
1126
1127                 if (ent)
1128                         snprintf(serv, servlen, "%s", ent->s_name);
1129                 else
1130                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1131         }
1132
1133         return 0;
1134 }
1135
1136 static HMODULE ipv6_dll = NULL;
1137 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1138 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1139                                       const struct addrinfo *hints,
1140                                       struct addrinfo **res);
1141 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1142                                       char *host, DWORD hostlen,
1143                                       char *serv, DWORD servlen, int flags);
1144 /*
1145  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1146  * don't need to try to load that one dynamically.
1147  */
1148
1149 static void socket_cleanup(void)
1150 {
1151         WSACleanup();
1152         if (ipv6_dll)
1153                 FreeLibrary(ipv6_dll);
1154         ipv6_dll = NULL;
1155         ipv6_freeaddrinfo = freeaddrinfo_stub;
1156         ipv6_getaddrinfo = getaddrinfo_stub;
1157         ipv6_getnameinfo = getnameinfo_stub;
1158 }
1159
1160 static void ensure_socket_initialization(void)
1161 {
1162         WSADATA wsa;
1163         static int initialized = 0;
1164         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1165         const char **name;
1166
1167         if (initialized)
1168                 return;
1169
1170         if (WSAStartup(MAKEWORD(2,2), &wsa))
1171                 die("unable to initialize winsock subsystem, error %d",
1172                         WSAGetLastError());
1173
1174         for (name = libraries; *name; name++) {
1175                 ipv6_dll = LoadLibrary(*name);
1176                 if (!ipv6_dll)
1177                         continue;
1178
1179                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1180                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1181                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1182                                                    const struct addrinfo *,
1183                                                    struct addrinfo **))
1184                         GetProcAddress(ipv6_dll, "getaddrinfo");
1185                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1186                                                    socklen_t, char *, DWORD,
1187                                                    char *, DWORD, int))
1188                         GetProcAddress(ipv6_dll, "getnameinfo");
1189                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1190                         FreeLibrary(ipv6_dll);
1191                         ipv6_dll = NULL;
1192                 } else
1193                         break;
1194         }
1195         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1196                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1197                 ipv6_getaddrinfo = getaddrinfo_stub;
1198                 ipv6_getnameinfo = getnameinfo_stub;
1199         }
1200
1201         atexit(socket_cleanup);
1202         initialized = 1;
1203 }
1204
1205 #undef gethostbyname
1206 struct hostent *mingw_gethostbyname(const char *host)
1207 {
1208         ensure_socket_initialization();
1209         return gethostbyname(host);
1210 }
1211
1212 void mingw_freeaddrinfo(struct addrinfo *res)
1213 {
1214         ipv6_freeaddrinfo(res);
1215 }
1216
1217 int mingw_getaddrinfo(const char *node, const char *service,
1218                       const struct addrinfo *hints, struct addrinfo **res)
1219 {
1220         ensure_socket_initialization();
1221         return ipv6_getaddrinfo(node, service, hints, res);
1222 }
1223
1224 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1225                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1226                       int flags)
1227 {
1228         ensure_socket_initialization();
1229         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1230 }
1231
1232 int mingw_socket(int domain, int type, int protocol)
1233 {
1234         int sockfd;
1235         SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
1236         if (s == INVALID_SOCKET) {
1237                 /*
1238                  * WSAGetLastError() values are regular BSD error codes
1239                  * biased by WSABASEERR.
1240                  * However, strerror() does not know about networking
1241                  * specific errors, which are values beginning at 38 or so.
1242                  * Therefore, we choose to leave the biased error code
1243                  * in errno so that _if_ someone looks up the code somewhere,
1244                  * then it is at least the number that are usually listed.
1245                  */
1246                 errno = WSAGetLastError();
1247                 return -1;
1248         }
1249         /* convert into a file descriptor */
1250         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1251                 closesocket(s);
1252                 return error("unable to make a socket file descriptor: %s",
1253                         strerror(errno));
1254         }
1255         return sockfd;
1256 }
1257
1258 #undef connect
1259 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1260 {
1261         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1262         return connect(s, sa, sz);
1263 }
1264
1265 #undef rename
1266 int mingw_rename(const char *pold, const char *pnew)
1267 {
1268         DWORD attrs, gle;
1269         int tries = 0;
1270         static const int delay[] = { 0, 1, 10, 20, 40 };
1271
1272         /*
1273          * Try native rename() first to get errno right.
1274          * It is based on MoveFile(), which cannot overwrite existing files.
1275          */
1276         if (!rename(pold, pnew))
1277                 return 0;
1278         if (errno != EEXIST)
1279                 return -1;
1280 repeat:
1281         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1282                 return 0;
1283         /* TODO: translate more errors */
1284         gle = GetLastError();
1285         if (gle == ERROR_ACCESS_DENIED &&
1286             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1287                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1288                         errno = EISDIR;
1289                         return -1;
1290                 }
1291                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1292                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1293                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1294                                 return 0;
1295                         gle = GetLastError();
1296                         /* revert file attributes on failure */
1297                         SetFileAttributes(pnew, attrs);
1298                 }
1299         }
1300         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1301                 /*
1302                  * We assume that some other process had the source or
1303                  * destination file open at the wrong moment and retry.
1304                  * In order to give the other process a higher chance to
1305                  * complete its operation, we give up our time slice now.
1306                  * If we have to retry again, we do sleep a bit.
1307                  */
1308                 Sleep(delay[tries]);
1309                 tries++;
1310                 goto repeat;
1311         }
1312         errno = EACCES;
1313         return -1;
1314 }
1315
1316 /*
1317  * Note that this doesn't return the actual pagesize, but
1318  * the allocation granularity. If future Windows specific git code
1319  * needs the real getpagesize function, we need to find another solution.
1320  */
1321 int mingw_getpagesize(void)
1322 {
1323         SYSTEM_INFO si;
1324         GetSystemInfo(&si);
1325         return si.dwAllocationGranularity;
1326 }
1327
1328 struct passwd *getpwuid(int uid)
1329 {
1330         static char user_name[100];
1331         static struct passwd p;
1332
1333         DWORD len = sizeof(user_name);
1334         if (!GetUserName(user_name, &len))
1335                 return NULL;
1336         p.pw_name = user_name;
1337         p.pw_gecos = "unknown";
1338         p.pw_dir = NULL;
1339         return &p;
1340 }
1341
1342 static HANDLE timer_event;
1343 static HANDLE timer_thread;
1344 static int timer_interval;
1345 static int one_shot;
1346 static sig_handler_t timer_fn = SIG_DFL;
1347
1348 /* The timer works like this:
1349  * The thread, ticktack(), is a trivial routine that most of the time
1350  * only waits to receive the signal to terminate. The main thread tells
1351  * the thread to terminate by setting the timer_event to the signalled
1352  * state.
1353  * But ticktack() interrupts the wait state after the timer's interval
1354  * length to call the signal handler.
1355  */
1356
1357 static unsigned __stdcall ticktack(void *dummy)
1358 {
1359         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1360                 if (timer_fn == SIG_DFL)
1361                         die("Alarm");
1362                 if (timer_fn != SIG_IGN)
1363                         timer_fn(SIGALRM);
1364                 if (one_shot)
1365                         break;
1366         }
1367         return 0;
1368 }
1369
1370 static int start_timer_thread(void)
1371 {
1372         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1373         if (timer_event) {
1374                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1375                 if (!timer_thread )
1376                         return errno = ENOMEM,
1377                                 error("cannot start timer thread");
1378         } else
1379                 return errno = ENOMEM,
1380                         error("cannot allocate resources for timer");
1381         return 0;
1382 }
1383
1384 static void stop_timer_thread(void)
1385 {
1386         if (timer_event)
1387                 SetEvent(timer_event);  /* tell thread to terminate */
1388         if (timer_thread) {
1389                 int rc = WaitForSingleObject(timer_thread, 1000);
1390                 if (rc == WAIT_TIMEOUT)
1391                         error("timer thread did not terminate timely");
1392                 else if (rc != WAIT_OBJECT_0)
1393                         error("waiting for timer thread failed: %lu",
1394                               GetLastError());
1395                 CloseHandle(timer_thread);
1396         }
1397         if (timer_event)
1398                 CloseHandle(timer_event);
1399         timer_event = NULL;
1400         timer_thread = NULL;
1401 }
1402
1403 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1404 {
1405         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1406 }
1407
1408 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1409 {
1410         static const struct timeval zero;
1411         static int atexit_done;
1412
1413         if (out != NULL)
1414                 return errno = EINVAL,
1415                         error("setitimer param 3 != NULL not implemented");
1416         if (!is_timeval_eq(&in->it_interval, &zero) &&
1417             !is_timeval_eq(&in->it_interval, &in->it_value))
1418                 return errno = EINVAL,
1419                         error("setitimer: it_interval must be zero or eq it_value");
1420
1421         if (timer_thread)
1422                 stop_timer_thread();
1423
1424         if (is_timeval_eq(&in->it_value, &zero) &&
1425             is_timeval_eq(&in->it_interval, &zero))
1426                 return 0;
1427
1428         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1429         one_shot = is_timeval_eq(&in->it_interval, &zero);
1430         if (!atexit_done) {
1431                 atexit(stop_timer_thread);
1432                 atexit_done = 1;
1433         }
1434         return start_timer_thread();
1435 }
1436
1437 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1438 {
1439         if (sig != SIGALRM)
1440                 return errno = EINVAL,
1441                         error("sigaction only implemented for SIGALRM");
1442         if (out != NULL)
1443                 return errno = EINVAL,
1444                         error("sigaction: param 3 != NULL not implemented");
1445
1446         timer_fn = in->sa_handler;
1447         return 0;
1448 }
1449
1450 #undef signal
1451 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1452 {
1453         sig_handler_t old = timer_fn;
1454         if (sig != SIGALRM)
1455                 return signal(sig, handler);
1456         timer_fn = handler;
1457         return old;
1458 }
1459
1460 static const char *make_backslash_path(const char *path)
1461 {
1462         static char buf[PATH_MAX + 1];
1463         char *c;
1464
1465         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1466                 die("Too long path: %.*s", 60, path);
1467
1468         for (c = buf; *c; c++) {
1469                 if (*c == '/')
1470                         *c = '\\';
1471         }
1472         return buf;
1473 }
1474
1475 void mingw_open_html(const char *unixpath)
1476 {
1477         const char *htmlpath = make_backslash_path(unixpath);
1478         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1479                         const char *, const char *, const char *, INT);
1480         T ShellExecute;
1481         HMODULE shell32;
1482         int r;
1483
1484         shell32 = LoadLibrary("shell32.dll");
1485         if (!shell32)
1486                 die("cannot load shell32.dll");
1487         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1488         if (!ShellExecute)
1489                 die("cannot run browser");
1490
1491         printf("Launching default browser to display HTML ...\n");
1492         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1493         FreeLibrary(shell32);
1494         /* see the MSDN documentation referring to the result codes here */
1495         if (r <= 32) {
1496                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1497         }
1498 }
1499
1500 int link(const char *oldpath, const char *newpath)
1501 {
1502         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1503         static T create_hard_link = NULL;
1504         if (!create_hard_link) {
1505                 create_hard_link = (T) GetProcAddress(
1506                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1507                 if (!create_hard_link)
1508                         create_hard_link = (T)-1;
1509         }
1510         if (create_hard_link == (T)-1) {
1511                 errno = ENOSYS;
1512                 return -1;
1513         }
1514         if (!create_hard_link(newpath, oldpath, NULL)) {
1515                 errno = err_win_to_posix(GetLastError());
1516                 return -1;
1517         }
1518         return 0;
1519 }
1520
1521 char *getpass(const char *prompt)
1522 {
1523         struct strbuf buf = STRBUF_INIT;
1524
1525         fputs(prompt, stderr);
1526         for (;;) {
1527                 char c = _getch();
1528                 if (c == '\r' || c == '\n')
1529                         break;
1530                 strbuf_addch(&buf, c);
1531         }
1532         fputs("\n", stderr);
1533         return strbuf_detach(&buf, NULL);
1534 }
1535
1536 #ifndef NO_MINGW_REPLACE_READDIR
1537 /* MinGW readdir implementation to avoid extra lstats for Git */
1538 struct mingw_DIR
1539 {
1540         struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1541         struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1542         long                    dd_handle;      /* _findnext handle */
1543         int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1544         char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1545 };
1546
1547 struct dirent *mingw_readdir(DIR *dir)
1548 {
1549         WIN32_FIND_DATAA buf;
1550         HANDLE handle;
1551         struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1552
1553         if (!dir->dd_handle) {
1554                 errno = EBADF; /* No set_errno for mingw */
1555                 return NULL;
1556         }
1557
1558         if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1559         {
1560                 DWORD lasterr;
1561                 handle = FindFirstFileA(dir->dd_name, &buf);
1562                 lasterr = GetLastError();
1563                 dir->dd_handle = (long)handle;
1564                 if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1565                         errno = err_win_to_posix(lasterr);
1566                         return NULL;
1567                 }
1568         } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1569                 return NULL;
1570         } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1571                 DWORD lasterr = GetLastError();
1572                 FindClose((HANDLE)dir->dd_handle);
1573                 dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1574                 /* POSIX says you shouldn't set errno when readdir can't
1575                    find any more files; so, if another error we leave it set. */
1576                 if (lasterr != ERROR_NO_MORE_FILES)
1577                         errno = err_win_to_posix(lasterr);
1578                 return NULL;
1579         }
1580
1581         /* We get here if `buf' contains valid data.  */
1582         strcpy(dir->dd_dir.d_name, buf.cFileName);
1583         ++dir->dd_stat;
1584
1585         /* Set file type, based on WIN32_FIND_DATA */
1586         mdir->dd_dir.d_type = 0;
1587         if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1588                 mdir->dd_dir.d_type |= DT_DIR;
1589         else
1590                 mdir->dd_dir.d_type |= DT_REG;
1591
1592         return (struct dirent*)&dir->dd_dir;
1593 }
1594 #endif // !NO_MINGW_REPLACE_READDIR