compat/mingw.c

   1 #include "../git-compat-util.h"
   2 #include "win32.h"
   3 #include <conio.h>
   4 #include "../strbuf.h"
   5
   6 int err_win_to_posix(DWORD winerr)
   7 {
   8         int error = ENOSYS;
   9         switch(winerr) {
  10         case ERROR_ACCESS_DENIED: error = EACCES; break;
  11         case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  12         case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  13         case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  14         case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  15         case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  16         case ERROR_BAD_COMMAND: error = EIO; break;
  17         case ERROR_BAD_DEVICE: error = ENODEV; break;
  18         case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  19         case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  20         case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  21         case ERROR_BAD_LENGTH: error = EINVAL; break;
  22         case ERROR_BAD_PATHNAME: error = ENOENT; break;
  23         case ERROR_BAD_PIPE: error = EPIPE; break;
  24         case ERROR_BAD_UNIT: error = ENODEV; break;
  25         case ERROR_BAD_USERNAME: error = EINVAL; break;
  26         case ERROR_BROKEN_PIPE: error = EPIPE; break;
  27         case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  28         case ERROR_BUSY: error = EBUSY; break;
  29         case ERROR_BUSY_DRIVE: error = EBUSY; break;
  30         case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  31         case ERROR_CANNOT_MAKE: error = EACCES; break;
  32         case ERROR_CANTOPEN: error = EIO; break;
  33         case ERROR_CANTREAD: error = EIO; break;
  34         case ERROR_CANTWRITE: error = EIO; break;
  35         case ERROR_CRC: error = EIO; break;
  36         case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  37         case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  38         case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  39         case ERROR_DIRECTORY: error = EINVAL; break;
  40         case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  41         case ERROR_DISK_CHANGE: error = EIO; break;
  42         case ERROR_DISK_FULL: error = ENOSPC; break;
  43         case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  44         case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  45         case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  46         case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  47         case ERROR_FILE_EXISTS: error = EEXIST; break;
  48         case ERROR_FILE_INVALID: error = ENODEV; break;
  49         case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  50         case ERROR_GEN_FAILURE: error = EIO; break;
  51         case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  52         case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  53         case ERROR_INVALID_ACCESS: error = EACCES; break;
  54         case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  55         case ERROR_INVALID_BLOCK: error = EFAULT; break;
  56         case ERROR_INVALID_DATA: error = EINVAL; break;
  57         case ERROR_INVALID_DRIVE: error = ENODEV; break;
  58         case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  59         case ERROR_INVALID_FLAGS: error = EINVAL; break;
  60         case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  61         case ERROR_INVALID_HANDLE: error = EBADF; break;
  62         case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  63         case ERROR_INVALID_NAME: error = EINVAL; break;
  64         case ERROR_INVALID_OWNER: error = EINVAL; break;
  65         case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  66         case ERROR_INVALID_PASSWORD: error = EPERM; break;
  67         case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  68         case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  69         case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  70         case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  71         case ERROR_IO_DEVICE: error = EIO; break;
  72         case ERROR_IO_INCOMPLETE: error = EINTR; break;
  73         case ERROR_LOCKED: error = EBUSY; break;
  74         case ERROR_LOCK_VIOLATION: error = EACCES; break;
  75         case ERROR_LOGON_FAILURE: error = EACCES; break;
  76         case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  77         case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  78         case ERROR_MORE_DATA: error = EPIPE; break;
  79         case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  80         case ERROR_NOACCESS: error = EFAULT; break;
  81         case ERROR_NONE_MAPPED: error = EINVAL; break;
  82         case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  83         case ERROR_NOT_READY: error = EAGAIN; break;
  84         case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  85         case ERROR_NO_DATA: error = EPIPE; break;
  86         case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  87         case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  88         case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  89         case ERROR_OPEN_FAILED: error = EIO; break;
  90         case ERROR_OPEN_FILES: error = EBUSY; break;
  91         case ERROR_OPERATION_ABORTED: error = EINTR; break;
  92         case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  93         case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
  94         case ERROR_PATH_BUSY: error = EBUSY; break;
  95         case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
  96         case ERROR_PIPE_BUSY: error = EBUSY; break;
  97         case ERROR_PIPE_CONNECTED: error = EPIPE; break;
  98         case ERROR_PIPE_LISTENING: error = EPIPE; break;
  99         case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 100         case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 101         case ERROR_READ_FAULT: error = EIO; break;
 102         case ERROR_SEEK: error = EIO; break;
 103         case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 104         case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 105         case ERROR_SHARING_VIOLATION: error = EACCES; break;
 106         case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 107         case ERROR_SWAPERROR: error = ENOENT; break;
 108         case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 109         case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 110         case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 111         case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 112         case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 113         case ERROR_WRITE_FAULT: error = EIO; break;
 114         case ERROR_WRITE_PROTECT: error = EROFS; break;
 115         }
 116         return error;
 117 }
 118
 119 #undef open
 120 int mingw_open (const char *filename, int oflags, ...)
 121 {
 122         va_list args;
 123         unsigned mode;
 124         int fd;
 125
 126         va_start(args, oflags);
 127         mode = va_arg(args, int);
 128         va_end(args);
 129
 130         if (!strcmp(filename, "/dev/null"))
 131                 filename = "nul";
 132
 133         fd = open(filename, oflags, mode);
 134
 135         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 136                 DWORD attrs = GetFileAttributes(filename);
 137                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 138                         errno = EISDIR;
 139         }
 140         return fd;
 141 }
 142
 143 #undef write
 144 ssize_t mingw_write(int fd, const void *buf, size_t count)
 145 {
 146         /*
 147          * While write() calls to a file on a local disk are translated
 148          * into WriteFile() calls with a maximum size of 64KB on Windows
 149          * XP and 256KB on Vista, no such cap is placed on writes to
 150          * files over the network on Windows XP.  Unfortunately, there
 151          * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 152          * bigger writes fail on Windows XP.
 153          * So we cap to a nice 31MB here to avoid write failures over
 154          * the net without changing the number of WriteFile() calls in
 155          * the local case.
 156          */
 157         return write(fd, buf, min(count, 31 * 1024 * 1024));
 158 }
 159
 160 #undef fopen
 161 FILE *mingw_fopen (const char *filename, const char *otype)
 162 {
 163         if (!strcmp(filename, "/dev/null"))
 164                 filename = "nul";
 165         return fopen(filename, otype);
 166 }
 167
 168 #undef freopen
 169 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 170 {
 171         if (filename && !strcmp(filename, "/dev/null"))
 172                 filename = "nul";
 173         return freopen(filename, otype, stream);
 174 }
 175
 176 /*
 177  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 178  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 179  */
 180 static inline long long filetime_to_hnsec(const FILETIME *ft)
 181 {
 182         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 183         /* Windows to Unix Epoch conversion */
 184         return winTime - 116444736000000000LL;
 185 }
 186
 187 static inline time_t filetime_to_time_t(const FILETIME *ft)
 188 {
 189         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 190 }
 191
 192 /* We keep the do_lstat code in a separate function to avoid recursion.
 193  * When a path ends with a slash, the stat will fail with ENOENT. In
 194  * this case, we strip the trailing slashes and stat again.
 195  */
 196 static int do_lstat(const char *file_name, struct stat *buf)
 197 {
 198         WIN32_FILE_ATTRIBUTE_DATA fdata;
 199
 200         if (!(errno = get_file_attr(file_name, &fdata))) {
 201                 buf->st_ino = 0;
 202                 buf->st_gid = 0;
 203                 buf->st_uid = 0;
 204                 buf->st_nlink = 1;
 205                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 206                 buf->st_size = fdata.nFileSizeLow |
 207                         (((off_t)fdata.nFileSizeHigh)<<32);
 208                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 209                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 210                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 211                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 212                 return 0;
 213         }
 214         return -1;
 215 }
 216
 217 /* We provide our own lstat/fstat functions, since the provided
 218  * lstat/fstat functions are so slow. These stat functions are
 219  * tailored for Git's usage (read: fast), and are not meant to be
 220  * complete. Note that Git stat()s are redirected to mingw_lstat()
 221  * too, since Windows doesn't really handle symlinks that well.
 222  */
 223 int mingw_lstat(const char *file_name, struct stat *buf)
 224 {
 225         int namelen;
 226         static char alt_name[PATH_MAX];
 227
 228         if (!do_lstat(file_name, buf))
 229                 return 0;
 230
 231         /* if file_name ended in a '/', Windows returned ENOENT;
 232          * try again without trailing slashes
 233          */
 234         if (errno != ENOENT)
 235                 return -1;
 236
 237         namelen = strlen(file_name);
 238         if (namelen && file_name[namelen-1] != '/')
 239                 return -1;
 240         while (namelen && file_name[namelen-1] == '/')
 241                 --namelen;
 242         if (!namelen || namelen >= PATH_MAX)
 243                 return -1;
 244
 245         memcpy(alt_name, file_name, namelen);
 246         alt_name[namelen] = 0;
 247         return do_lstat(alt_name, buf);
 248 }
 249
 250 #undef fstat
 251 int mingw_fstat(int fd, struct stat *buf)
 252 {
 253         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 254         BY_HANDLE_FILE_INFORMATION fdata;
 255
 256         if (fh == INVALID_HANDLE_VALUE) {
 257                 errno = EBADF;
 258                 return -1;
 259         }
 260         /* direct non-file handles to MS's fstat() */
 261         if (GetFileType(fh) != FILE_TYPE_DISK)
 262                 return _fstati64(fd, buf);
 263
 264         if (GetFileInformationByHandle(fh, &fdata)) {
 265                 buf->st_ino = 0;
 266                 buf->st_gid = 0;
 267                 buf->st_uid = 0;
 268                 buf->st_nlink = 1;
 269                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 270                 buf->st_size = fdata.nFileSizeLow |
 271                         (((off_t)fdata.nFileSizeHigh)<<32);
 272                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 273                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 274                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 275                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 276                 return 0;
 277         }
 278         errno = EBADF;
 279         return -1;
 280 }
 281
 282 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 283 {
 284         long long winTime = t * 10000000LL + 116444736000000000LL;
 285         ft->dwLowDateTime = winTime;
 286         ft->dwHighDateTime = winTime >> 32;
 287 }
 288
 289 int mingw_utime (const char *file_name, const struct utimbuf *times)
 290 {
 291         FILETIME mft, aft;
 292         int fh, rc;
 293
 294         /* must have write permission */
 295         DWORD attrs = GetFileAttributes(file_name);
 296         if (attrs != INVALID_FILE_ATTRIBUTES &&
 297             (attrs & FILE_ATTRIBUTE_READONLY)) {
 298                 /* ignore errors here; open() will report them */
 299                 SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 300         }
 301
 302         if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 303                 rc = -1;
 304                 goto revert_attrs;
 305         }
 306
 307         if (times) {
 308                 time_t_to_filetime(times->modtime, &mft);
 309                 time_t_to_filetime(times->actime, &aft);
 310         } else {
 311                 GetSystemTimeAsFileTime(&mft);
 312                 aft = mft;
 313         }
 314         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 315                 errno = EINVAL;
 316                 rc = -1;
 317         } else
 318                 rc = 0;
 319         close(fh);
 320
 321 revert_attrs:
 322         if (attrs != INVALID_FILE_ATTRIBUTES &&
 323             (attrs & FILE_ATTRIBUTE_READONLY)) {
 324                 /* ignore errors again */
 325                 SetFileAttributes(file_name, attrs);
 326         }
 327         return rc;
 328 }
 329
 330 unsigned int sleep (unsigned int seconds)
 331 {
 332         Sleep(seconds*1000);
 333         return 0;
 334 }
 335
 336 int mkstemp(char *template)
 337 {
 338         char *filename = mktemp(template);
 339         if (filename == NULL)
 340                 return -1;
 341         return open(filename, O_RDWR | O_CREAT, 0600);
 342 }
 343
 344 int gettimeofday(struct timeval *tv, void *tz)
 345 {
 346         FILETIME ft;
 347         long long hnsec;
 348
 349         GetSystemTimeAsFileTime(&ft);
 350         hnsec = filetime_to_hnsec(&ft);
 351         tv->tv_sec = hnsec / 10000000;
 352         tv->tv_usec = (hnsec % 10000000) / 10;
 353         return 0;
 354 }
 355
 356 int pipe(int filedes[2])
 357 {
 358         HANDLE h[2];
 359
 360         /* this creates non-inheritable handles */
 361         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 362                 errno = err_win_to_posix(GetLastError());
 363                 return -1;
 364         }
 365         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 366         if (filedes[0] < 0) {
 367                 CloseHandle(h[0]);
 368                 CloseHandle(h[1]);
 369                 return -1;
 370         }
 371         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 372         if (filedes[0] < 0) {
 373                 close(filedes[0]);
 374                 CloseHandle(h[1]);
 375                 return -1;
 376         }
 377         return 0;
 378 }
 379
 380 int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 381 {
 382         int i, pending;
 383
 384         if (timeout >= 0) {
 385                 if (nfds == 0) {
 386                         Sleep(timeout);
 387                         return 0;
 388                 }
 389                 return errno = EINVAL, error("poll timeout not supported");
 390         }
 391
 392         /* When there is only one fd to wait for, then we pretend that
 393          * input is available and let the actual wait happen when the
 394          * caller invokes read().
 395          */
 396         if (nfds == 1) {
 397                 if (!(ufds[0].events & POLLIN))
 398                         return errno = EINVAL, error("POLLIN not set");
 399                 ufds[0].revents = POLLIN;
 400                 return 0;
 401         }
 402
 403 repeat:
 404         pending = 0;
 405         for (i = 0; i < nfds; i++) {
 406                 DWORD avail = 0;
 407                 HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 408                 if (h == INVALID_HANDLE_VALUE)
 409                         return -1;      /* errno was set */
 410
 411                 if (!(ufds[i].events & POLLIN))
 412                         return errno = EINVAL, error("POLLIN not set");
 413
 414                 /* this emulation works only for pipes */
 415                 if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 416                         int err = GetLastError();
 417                         if (err == ERROR_BROKEN_PIPE) {
 418                                 ufds[i].revents = POLLHUP;
 419                                 pending++;
 420                         } else {
 421                                 errno = EINVAL;
 422                                 return error("PeekNamedPipe failed,"
 423                                         " GetLastError: %u", err);
 424                         }
 425                 } else if (avail) {
 426                         ufds[i].revents = POLLIN;
 427                         pending++;
 428                 } else
 429                         ufds[i].revents = 0;
 430         }
 431         if (!pending) {
 432                 /* The only times that we spin here is when the process
 433                  * that is connected through the pipes is waiting for
 434                  * its own input data to become available. But since
 435                  * the process (pack-objects) is itself CPU intensive,
 436                  * it will happily pick up the time slice that we are
 437                  * relinquishing here.
 438                  */
 439                 Sleep(0);
 440                 goto repeat;
 441         }
 442         return 0;
 443 }
 444
 445 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 446 {
 447         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 448         memcpy(result, gmtime(timep), sizeof(struct tm));
 449         return result;
 450 }
 451
 452 struct tm *localtime_r(const time_t *timep, struct tm *result)
 453 {
 454         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 455         memcpy(result, localtime(timep), sizeof(struct tm));
 456         return result;
 457 }
 458
 459 #undef getcwd
 460 char *mingw_getcwd(char *pointer, int len)
 461 {
 462         int i;
 463         char *ret = getcwd(pointer, len);
 464         if (!ret)
 465                 return ret;
 466         for (i = 0; pointer[i]; i++)
 467                 if (pointer[i] == '\\')
 468                         pointer[i] = '/';
 469         return ret;
 470 }
 471
 472 #undef getenv
 473 char *mingw_getenv(const char *name)
 474 {
 475         char *result = getenv(name);
 476         if (!result && !strcmp(name, "TMPDIR")) {
 477                 /* on Windows it is TMP and TEMP */
 478                 result = getenv("TMP");
 479                 if (!result)
 480                         result = getenv("TEMP");
 481         }
 482         return result;
 483 }
 484
 485 /*
 486  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 487  * (Parsing C++ Command-Line Arguments)
 488  */
 489 static const char *quote_arg(const char *arg)
 490 {
 491         /* count chars to quote */
 492         int len = 0, n = 0;
 493         int force_quotes = 0;
 494         char *q, *d;
 495         const char *p = arg;
 496         if (!*p) force_quotes = 1;
 497         while (*p) {
 498                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 499                         force_quotes = 1;
 500                 else if (*p == '"')
 501                         n++;
 502                 else if (*p == '\\') {
 503                         int count = 0;
 504                         while (*p == '\\') {
 505                                 count++;
 506                                 p++;
 507                                 len++;
 508                         }
 509                         if (*p == '"')
 510                                 n += count*2 + 1;
 511                         continue;
 512                 }
 513                 len++;
 514                 p++;
 515         }
 516         if (!force_quotes && n == 0)
 517                 return arg;
 518
 519         /* insert \ where necessary */
 520         d = q = xmalloc(len+n+3);
 521         *d++ = '"';
 522         while (*arg) {
 523                 if (*arg == '"')
 524                         *d++ = '\\';
 525                 else if (*arg == '\\') {
 526                         int count = 0;
 527                         while (*arg == '\\') {
 528                                 count++;
 529                                 *d++ = *arg++;
 530                         }
 531                         if (*arg == '"') {
 532                                 while (count-- > 0)
 533                                         *d++ = '\\';
 534                                 *d++ = '\\';
 535                         }
 536                 }
 537                 *d++ = *arg++;
 538         }
 539         *d++ = '"';
 540         *d++ = 0;
 541         return q;
 542 }
 543
 544 static const char *parse_interpreter(const char *cmd)
 545 {
 546         static char buf[100];
 547         char *p, *opt;
 548         int n, fd;
 549
 550         /* don't even try a .exe */
 551         n = strlen(cmd);
 552         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 553                 return NULL;
 554
 555         fd = open(cmd, O_RDONLY);
 556         if (fd < 0)
 557                 return NULL;
 558         n = read(fd, buf, sizeof(buf)-1);
 559         close(fd);
 560         if (n < 4)      /* at least '#!/x' and not error */
 561                 return NULL;
 562
 563         if (buf[0] != '#' || buf[1] != '!')
 564                 return NULL;
 565         buf[n] = '\0';
 566         p = buf + strcspn(buf, "\r\n");
 567         if (!*p)
 568                 return NULL;
 569
 570         *p = '\0';
 571         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 572                 return NULL;
 573         /* strip options */
 574         if ((opt = strchr(p+1, ' ')))
 575                 *opt = '\0';
 576         return p+1;
 577 }
 578
 579 /*
 580  * Splits the PATH into parts.
 581  */
 582 static char **get_path_split(void)
 583 {
 584         char *p, **path, *envpath = getenv("PATH");
 585         int i, n = 0;
 586
 587         if (!envpath || !*envpath)
 588                 return NULL;
 589
 590         envpath = xstrdup(envpath);
 591         p = envpath;
 592         while (p) {
 593                 char *dir = p;
 594                 p = strchr(p, ';');
 595                 if (p) *p++ = '\0';
 596                 if (*dir) {     /* not earlier, catches series of ; */
 597                         ++n;
 598                 }
 599         }
 600         if (!n)
 601                 return NULL;
 602
 603         path = xmalloc((n+1)*sizeof(char *));
 604         p = envpath;
 605         i = 0;
 606         do {
 607                 if (*p)
 608                         path[i++] = xstrdup(p);
 609                 p = p+strlen(p)+1;
 610         } while (i < n);
 611         path[i] = NULL;
 612
 613         free(envpath);
 614
 615         return path;
 616 }
 617
 618 static void free_path_split(char **path)
 619 {
 620         char **p = path;
 621
 622         if (!path)
 623                 return;
 624
 625         while (*p)
 626                 free(*p++);
 627         free(path);
 628 }
 629
 630 /*
 631  * exe_only means that we only want to detect .exe files, but not scripts
 632  * (which do not have an extension)
 633  */
 634 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 635 {
 636         char path[MAX_PATH];
 637         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 638
 639         if (!isexe && access(path, F_OK) == 0)
 640                 return xstrdup(path);
 641         path[strlen(path)-4] = '\0';
 642         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 643                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 644                         return xstrdup(path);
 645         return NULL;
 646 }
 647
 648 /*
 649  * Determines the absolute path of cmd using the split path in path.
 650  * If cmd contains a slash or backslash, no lookup is performed.
 651  */
 652 static char *path_lookup(const char *cmd, char **path, int exe_only)
 653 {
 654         char *prog = NULL;
 655         int len = strlen(cmd);
 656         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 657
 658         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 659                 prog = xstrdup(cmd);
 660
 661         while (!prog && *path)
 662                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 663
 664         return prog;
 665 }
 666
 667 static int env_compare(const void *a, const void *b)
 668 {
 669         char *const *ea = a;
 670         char *const *eb = b;
 671         return strcasecmp(*ea, *eb);
 672 }
 673
 674 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 675                               const char *dir,
 676                               int prepend_cmd, int fhin, int fhout, int fherr)
 677 {
 678         STARTUPINFO si;
 679         PROCESS_INFORMATION pi;
 680         struct strbuf envblk, args;
 681         unsigned flags;
 682         BOOL ret;
 683
 684         /* Determine whether or not we are associated to a console */
 685         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 686                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 687                         FILE_ATTRIBUTE_NORMAL, NULL);
 688         if (cons == INVALID_HANDLE_VALUE) {
 689                 /* There is no console associated with this process.
 690                  * Since the child is a console process, Windows
 691                  * would normally create a console window. But
 692                  * since we'll be redirecting std streams, we do
 693                  * not need the console.
 694                  * It is necessary to use DETACHED_PROCESS
 695                  * instead of CREATE_NO_WINDOW to make ssh
 696                  * recognize that it has no console.
 697                  */
 698                 flags = DETACHED_PROCESS;
 699         } else {
 700                 /* There is already a console. If we specified
 701                  * DETACHED_PROCESS here, too, Windows would
 702                  * disassociate the child from the console.
 703                  * The same is true for CREATE_NO_WINDOW.
 704                  * Go figure!
 705                  */
 706                 flags = 0;
 707                 CloseHandle(cons);
 708         }
 709         memset(&si, 0, sizeof(si));
 710         si.cb = sizeof(si);
 711         si.dwFlags = STARTF_USESTDHANDLES;
 712         si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 713         si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 714         si.hStdError = (HANDLE) _get_osfhandle(fherr);
 715
 716         /* concatenate argv, quoting args as we go */
 717         strbuf_init(&args, 0);
 718         if (prepend_cmd) {
 719                 char *quoted = (char *)quote_arg(cmd);
 720                 strbuf_addstr(&args, quoted);
 721                 if (quoted != cmd)
 722                         free(quoted);
 723         }
 724         for (; *argv; argv++) {
 725                 char *quoted = (char *)quote_arg(*argv);
 726                 if (*args.buf)
 727                         strbuf_addch(&args, ' ');
 728                 strbuf_addstr(&args, quoted);
 729                 if (quoted != *argv)
 730                         free(quoted);
 731         }
 732
 733         if (env) {
 734                 int count = 0;
 735                 char **e, **sorted_env;
 736
 737                 for (e = env; *e; e++)
 738                         count++;
 739
 740                 /* environment must be sorted */
 741                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 742                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 743                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 744
 745                 strbuf_init(&envblk, 0);
 746                 for (e = sorted_env; *e; e++) {
 747                         strbuf_addstr(&envblk, *e);
 748                         strbuf_addch(&envblk, '\0');
 749                 }
 750                 free(sorted_env);
 751         }
 752
 753         memset(&pi, 0, sizeof(pi));
 754         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 755                 env ? envblk.buf : NULL, dir, &si, &pi);
 756
 757         if (env)
 758                 strbuf_release(&envblk);
 759         strbuf_release(&args);
 760
 761         if (!ret) {
 762                 errno = ENOENT;
 763                 return -1;
 764         }
 765         CloseHandle(pi.hThread);
 766         return (pid_t)pi.hProcess;
 767 }
 768
 769 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 770                            int prepend_cmd)
 771 {
 772         return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 773 }
 774
 775 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 776                      const char *dir,
 777                      int fhin, int fhout, int fherr)
 778 {
 779         pid_t pid;
 780         char **path = get_path_split();
 781         char *prog = path_lookup(cmd, path, 0);
 782
 783         if (!prog) {
 784                 errno = ENOENT;
 785                 pid = -1;
 786         }
 787         else {
 788                 const char *interpr = parse_interpreter(prog);
 789
 790                 if (interpr) {
 791                         const char *argv0 = argv[0];
 792                         char *iprog = path_lookup(interpr, path, 1);
 793                         argv[0] = prog;
 794                         if (!iprog) {
 795                                 errno = ENOENT;
 796                                 pid = -1;
 797                         }
 798                         else {
 799                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 800                                                        fhin, fhout, fherr);
 801                                 free(iprog);
 802                         }
 803                         argv[0] = argv0;
 804                 }
 805                 else
 806                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
 807                                                fhin, fhout, fherr);
 808                 free(prog);
 809         }
 810         free_path_split(path);
 811         return pid;
 812 }
 813
 814 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 815 {
 816         const char *interpr = parse_interpreter(cmd);
 817         char **path;
 818         char *prog;
 819         int pid = 0;
 820
 821         if (!interpr)
 822                 return 0;
 823         path = get_path_split();
 824         prog = path_lookup(interpr, path, 1);
 825         if (prog) {
 826                 int argc = 0;
 827                 const char **argv2;
 828                 while (argv[argc]) argc++;
 829                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
 830                 argv2[0] = (char *)cmd; /* full path to the script file */
 831                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 832                 pid = mingw_spawnve(prog, argv2, env, 1);
 833                 if (pid >= 0) {
 834                         int status;
 835                         if (waitpid(pid, &status, 0) < 0)
 836                                 status = 255;
 837                         exit(status);
 838                 }
 839                 pid = 1;        /* indicate that we tried but failed */
 840                 free(prog);
 841                 free(argv2);
 842         }
 843         free_path_split(path);
 844         return pid;
 845 }
 846
 847 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 848 {
 849         /* check if git_command is a shell script */
 850         if (!try_shell_exec(cmd, argv, (char **)env)) {
 851                 int pid, status;
 852
 853                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 854                 if (pid < 0)
 855                         return;
 856                 if (waitpid(pid, &status, 0) < 0)
 857                         status = 255;
 858                 exit(status);
 859         }
 860 }
 861
 862 void mingw_execvp(const char *cmd, char *const *argv)
 863 {
 864         char **path = get_path_split();
 865         char *prog = path_lookup(cmd, path, 0);
 866
 867         if (prog) {
 868                 mingw_execve(prog, argv, environ);
 869                 free(prog);
 870         } else
 871                 errno = ENOENT;
 872
 873         free_path_split(path);
 874 }
 875
 876 static char **copy_environ(void)
 877 {
 878         char **env;
 879         int i = 0;
 880         while (environ[i])
 881                 i++;
 882         env = xmalloc((i+1)*sizeof(*env));
 883         for (i = 0; environ[i]; i++)
 884                 env[i] = xstrdup(environ[i]);
 885         env[i] = NULL;
 886         return env;
 887 }
 888
 889 void free_environ(char **env)
 890 {
 891         int i;
 892         for (i = 0; env[i]; i++)
 893                 free(env[i]);
 894         free(env);
 895 }
 896
 897 static int lookup_env(char **env, const char *name, size_t nmln)
 898 {
 899         int i;
 900
 901         for (i = 0; env[i]; i++) {
 902                 if (0 == strncmp(env[i], name, nmln)
 903                     && '=' == env[i][nmln])
 904                         /* matches */
 905                         return i;
 906         }
 907         return -1;
 908 }
 909
 910 /*
 911  * If name contains '=', then sets the variable, otherwise it unsets it
 912  */
 913 static char **env_setenv(char **env, const char *name)
 914 {
 915         char *eq = strchrnul(name, '=');
 916         int i = lookup_env(env, name, eq-name);
 917
 918         if (i < 0) {
 919                 if (*eq) {
 920                         for (i = 0; env[i]; i++)
 921                                 ;
 922                         env = xrealloc(env, (i+2)*sizeof(*env));
 923                         env[i] = xstrdup(name);
 924                         env[i+1] = NULL;
 925                 }
 926         }
 927         else {
 928                 free(env[i]);
 929                 if (*eq)
 930                         env[i] = xstrdup(name);
 931                 else
 932                         for (; env[i]; i++)
 933                                 env[i] = env[i+1];
 934         }
 935         return env;
 936 }
 937
 938 /*
 939  * Copies global environ and adjusts variables as specified by vars.
 940  */
 941 char **make_augmented_environ(const char *const *vars)
 942 {
 943         char **env = copy_environ();
 944
 945         while (*vars)
 946                 env = env_setenv(env, *vars++);
 947         return env;
 948 }
 949
 950 /*
 951  * Note, this isn't a complete replacement for getaddrinfo. It assumes
 952  * that service contains a numerical port, or that it it is null. It
 953  * does a simple search using gethostbyname, and returns one IPv4 host
 954  * if one was found.
 955  */
 956 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
 957                                    const struct addrinfo *hints,
 958                                    struct addrinfo **res)
 959 {
 960         struct hostent *h = gethostbyname(node);
 961         struct addrinfo *ai;
 962         struct sockaddr_in *sin;
 963
 964         if (!h)
 965                 return WSAGetLastError();
 966
 967         ai = xmalloc(sizeof(struct addrinfo));
 968         *res = ai;
 969         ai->ai_flags = 0;
 970         ai->ai_family = AF_INET;
 971         ai->ai_socktype = hints->ai_socktype;
 972         switch (hints->ai_socktype) {
 973         case SOCK_STREAM:
 974                 ai->ai_protocol = IPPROTO_TCP;
 975                 break;
 976         case SOCK_DGRAM:
 977                 ai->ai_protocol = IPPROTO_UDP;
 978                 break;
 979         default:
 980                 ai->ai_protocol = 0;
 981                 break;
 982         }
 983         ai->ai_addrlen = sizeof(struct sockaddr_in);
 984         ai->ai_canonname = strdup(h->h_name);
 985
 986         sin = xmalloc(ai->ai_addrlen);
 987         memset(sin, 0, ai->ai_addrlen);
 988         sin->sin_family = AF_INET;
 989         if (service)
 990                 sin->sin_port = htons(atoi(service));
 991         sin->sin_addr = *(struct in_addr *)h->h_addr;
 992         ai->ai_addr = (struct sockaddr *)sin;
 993         ai->ai_next = 0;
 994         return 0;
 995 }
 996
 997 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
 998 {
 999         free(res->ai_canonname);
1000         free(res->ai_addr);
1001         free(res);
1002 }
1003
1004 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1005                                    char *host, DWORD hostlen,
1006                                    char *serv, DWORD servlen, int flags)
1007 {
1008         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1009         if (sa->sa_family != AF_INET)
1010                 return EAI_FAMILY;
1011         if (!host && !serv)
1012                 return EAI_NONAME;
1013
1014         if (host && hostlen > 0) {
1015                 struct hostent *ent = NULL;
1016                 if (!(flags & NI_NUMERICHOST))
1017                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1018                                             sizeof(sin->sin_addr), AF_INET);
1019
1020                 if (ent)
1021                         snprintf(host, hostlen, "%s", ent->h_name);
1022                 else if (flags & NI_NAMEREQD)
1023                         return EAI_NONAME;
1024                 else
1025                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1026         }
1027
1028         if (serv && servlen > 0) {
1029                 struct servent *ent = NULL;
1030                 if (!(flags & NI_NUMERICSERV))
1031                         ent = getservbyport(sin->sin_port,
1032                                             flags & NI_DGRAM ? "udp" : "tcp");
1033
1034                 if (ent)
1035                         snprintf(serv, servlen, "%s", ent->s_name);
1036                 else
1037                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1038         }
1039
1040         return 0;
1041 }
1042
1043 static HMODULE ipv6_dll = NULL;
1044 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1045 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1046                                       const struct addrinfo *hints,
1047                                       struct addrinfo **res);
1048 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1049                                       char *host, DWORD hostlen,
1050                                       char *serv, DWORD servlen, int flags);
1051 /*
1052  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1053  * don't need to try to load that one dynamically.
1054  */
1055
1056 static void socket_cleanup(void)
1057 {
1058         WSACleanup();
1059         if (ipv6_dll)
1060                 FreeLibrary(ipv6_dll);
1061         ipv6_dll = NULL;
1062         ipv6_freeaddrinfo = freeaddrinfo_stub;
1063         ipv6_getaddrinfo = getaddrinfo_stub;
1064         ipv6_getnameinfo = getnameinfo_stub;
1065 }
1066
1067 static void ensure_socket_initialization(void)
1068 {
1069         WSADATA wsa;
1070         static int initialized = 0;
1071         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1072         const char **name;
1073
1074         if (initialized)
1075                 return;
1076
1077         if (WSAStartup(MAKEWORD(2,2), &wsa))
1078                 die("unable to initialize winsock subsystem, error %d",
1079                         WSAGetLastError());
1080
1081         for (name = libraries; *name; name++) {
1082                 ipv6_dll = LoadLibrary(*name);
1083                 if (!ipv6_dll)
1084                         continue;
1085
1086                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1087                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1088                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1089                                                    const struct addrinfo *,
1090                                                    struct addrinfo **))
1091                         GetProcAddress(ipv6_dll, "getaddrinfo");
1092                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1093                                                    socklen_t, char *, DWORD,
1094                                                    char *, DWORD, int))
1095                         GetProcAddress(ipv6_dll, "getnameinfo");
1096                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1097                         FreeLibrary(ipv6_dll);
1098                         ipv6_dll = NULL;
1099                 } else
1100                         break;
1101         }
1102         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1103                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1104                 ipv6_getaddrinfo = getaddrinfo_stub;
1105                 ipv6_getnameinfo = getnameinfo_stub;
1106         }
1107
1108         atexit(socket_cleanup);
1109         initialized = 1;
1110 }
1111
1112 #undef gethostbyname
1113 struct hostent *mingw_gethostbyname(const char *host)
1114 {
1115         ensure_socket_initialization();
1116         return gethostbyname(host);
1117 }
1118
1119 void mingw_freeaddrinfo(struct addrinfo *res)
1120 {
1121         ipv6_freeaddrinfo(res);
1122 }
1123
1124 int mingw_getaddrinfo(const char *node, const char *service,
1125                       const struct addrinfo *hints, struct addrinfo **res)
1126 {
1127         ensure_socket_initialization();
1128         return ipv6_getaddrinfo(node, service, hints, res);
1129 }
1130
1131 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1132                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1133                       int flags)
1134 {
1135         ensure_socket_initialization();
1136         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1137 }
1138
1139 int mingw_socket(int domain, int type, int protocol)
1140 {
1141         int sockfd;
1142         SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
1143         if (s == INVALID_SOCKET) {
1144                 /*
1145                  * WSAGetLastError() values are regular BSD error codes
1146                  * biased by WSABASEERR.
1147                  * However, strerror() does not know about networking
1148                  * specific errors, which are values beginning at 38 or so.
1149                  * Therefore, we choose to leave the biased error code
1150                  * in errno so that _if_ someone looks up the code somewhere,
1151                  * then it is at least the number that are usually listed.
1152                  */
1153                 errno = WSAGetLastError();
1154                 return -1;
1155         }
1156         /* convert into a file descriptor */
1157         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1158                 closesocket(s);
1159                 return error("unable to make a socket file descriptor: %s",
1160                         strerror(errno));
1161         }
1162         return sockfd;
1163 }
1164
1165 #undef connect
1166 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1167 {
1168         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1169         return connect(s, sa, sz);
1170 }
1171
1172 #undef rename
1173 int mingw_rename(const char *pold, const char *pnew)
1174 {
1175         DWORD attrs, gle;
1176         int tries = 0;
1177         static const int delay[] = { 0, 1, 10, 20, 40 };
1178
1179         /*
1180          * Try native rename() first to get errno right.
1181          * It is based on MoveFile(), which cannot overwrite existing files.
1182          */
1183         if (!rename(pold, pnew))
1184                 return 0;
1185         if (errno != EEXIST)
1186                 return -1;
1187 repeat:
1188         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1189                 return 0;
1190         /* TODO: translate more errors */
1191         gle = GetLastError();
1192         if (gle == ERROR_ACCESS_DENIED &&
1193             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1194                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1195                         errno = EISDIR;
1196                         return -1;
1197                 }
1198                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1199                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1200                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1201                                 return 0;
1202                         gle = GetLastError();
1203                         /* revert file attributes on failure */
1204                         SetFileAttributes(pnew, attrs);
1205                 }
1206         }
1207         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1208                 /*
1209                  * We assume that some other process had the source or
1210                  * destination file open at the wrong moment and retry.
1211                  * In order to give the other process a higher chance to
1212                  * complete its operation, we give up our time slice now.
1213                  * If we have to retry again, we do sleep a bit.
1214                  */
1215                 Sleep(delay[tries]);
1216                 tries++;
1217                 goto repeat;
1218         }
1219         errno = EACCES;
1220         return -1;
1221 }
1222
1223 /*
1224  * Note that this doesn't return the actual pagesize, but
1225  * the allocation granularity. If future Windows specific git code
1226  * needs the real getpagesize function, we need to find another solution.
1227  */
1228 int mingw_getpagesize(void)
1229 {
1230         SYSTEM_INFO si;
1231         GetSystemInfo(&si);
1232         return si.dwAllocationGranularity;
1233 }
1234
1235 struct passwd *getpwuid(int uid)
1236 {
1237         static char user_name[100];
1238         static struct passwd p;
1239
1240         DWORD len = sizeof(user_name);
1241         if (!GetUserName(user_name, &len))
1242                 return NULL;
1243         p.pw_name = user_name;
1244         p.pw_gecos = "unknown";
1245         p.pw_dir = NULL;
1246         return &p;
1247 }
1248
1249 static HANDLE timer_event;
1250 static HANDLE timer_thread;
1251 static int timer_interval;
1252 static int one_shot;
1253 static sig_handler_t timer_fn = SIG_DFL;
1254
1255 /* The timer works like this:
1256  * The thread, ticktack(), is a trivial routine that most of the time
1257  * only waits to receive the signal to terminate. The main thread tells
1258  * the thread to terminate by setting the timer_event to the signalled
1259  * state.
1260  * But ticktack() interrupts the wait state after the timer's interval
1261  * length to call the signal handler.
1262  */
1263
1264 static unsigned __stdcall ticktack(void *dummy)
1265 {
1266         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1267                 if (timer_fn == SIG_DFL)
1268                         die("Alarm");
1269                 if (timer_fn != SIG_IGN)
1270                         timer_fn(SIGALRM);
1271                 if (one_shot)
1272                         break;
1273         }
1274         return 0;
1275 }
1276
1277 static int start_timer_thread(void)
1278 {
1279         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1280         if (timer_event) {
1281                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1282                 if (!timer_thread )
1283                         return errno = ENOMEM,
1284                                 error("cannot start timer thread");
1285         } else
1286                 return errno = ENOMEM,
1287                         error("cannot allocate resources for timer");
1288         return 0;
1289 }
1290
1291 static void stop_timer_thread(void)
1292 {
1293         if (timer_event)
1294                 SetEvent(timer_event);  /* tell thread to terminate */
1295         if (timer_thread) {
1296                 int rc = WaitForSingleObject(timer_thread, 1000);
1297                 if (rc == WAIT_TIMEOUT)
1298                         error("timer thread did not terminate timely");
1299                 else if (rc != WAIT_OBJECT_0)
1300                         error("waiting for timer thread failed: %lu",
1301                               GetLastError());
1302                 CloseHandle(timer_thread);
1303         }
1304         if (timer_event)
1305                 CloseHandle(timer_event);
1306         timer_event = NULL;
1307         timer_thread = NULL;
1308 }
1309
1310 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1311 {
1312         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1313 }
1314
1315 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1316 {
1317         static const struct timeval zero;
1318         static int atexit_done;
1319
1320         if (out != NULL)
1321                 return errno = EINVAL,
1322                         error("setitimer param 3 != NULL not implemented");
1323         if (!is_timeval_eq(&in->it_interval, &zero) &&
1324             !is_timeval_eq(&in->it_interval, &in->it_value))
1325                 return errno = EINVAL,
1326                         error("setitimer: it_interval must be zero or eq it_value");
1327
1328         if (timer_thread)
1329                 stop_timer_thread();
1330
1331         if (is_timeval_eq(&in->it_value, &zero) &&
1332             is_timeval_eq(&in->it_interval, &zero))
1333                 return 0;
1334
1335         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1336         one_shot = is_timeval_eq(&in->it_interval, &zero);
1337         if (!atexit_done) {
1338                 atexit(stop_timer_thread);
1339                 atexit_done = 1;
1340         }
1341         return start_timer_thread();
1342 }
1343
1344 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1345 {
1346         if (sig != SIGALRM)
1347                 return errno = EINVAL,
1348                         error("sigaction only implemented for SIGALRM");
1349         if (out != NULL)
1350                 return errno = EINVAL,
1351                         error("sigaction: param 3 != NULL not implemented");
1352
1353         timer_fn = in->sa_handler;
1354         return 0;
1355 }
1356
1357 #undef signal
1358 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1359 {
1360         sig_handler_t old = timer_fn;
1361         if (sig != SIGALRM)
1362                 return signal(sig, handler);
1363         timer_fn = handler;
1364         return old;
1365 }
1366
1367 static const char *make_backslash_path(const char *path)
1368 {
1369         static char buf[PATH_MAX + 1];
1370         char *c;
1371
1372         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1373                 die("Too long path: %.*s", 60, path);
1374
1375         for (c = buf; *c; c++) {
1376                 if (*c == '/')
1377                         *c = '\\';
1378         }
1379         return buf;
1380 }
1381
1382 void mingw_open_html(const char *unixpath)
1383 {
1384         const char *htmlpath = make_backslash_path(unixpath);
1385         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1386                         const char *, const char *, const char *, INT);
1387         T ShellExecute;
1388         HMODULE shell32;
1389
1390         shell32 = LoadLibrary("shell32.dll");
1391         if (!shell32)
1392                 die("cannot load shell32.dll");
1393         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1394         if (!ShellExecute)
1395                 die("cannot run browser");
1396
1397         printf("Launching default browser to display HTML ...\n");
1398         ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1399
1400         FreeLibrary(shell32);
1401 }
1402
1403 int link(const char *oldpath, const char *newpath)
1404 {
1405         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1406         static T create_hard_link = NULL;
1407         if (!create_hard_link) {
1408                 create_hard_link = (T) GetProcAddress(
1409                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1410                 if (!create_hard_link)
1411                         create_hard_link = (T)-1;
1412         }
1413         if (create_hard_link == (T)-1) {
1414                 errno = ENOSYS;
1415                 return -1;
1416         }
1417         if (!create_hard_link(newpath, oldpath, NULL)) {
1418                 errno = err_win_to_posix(GetLastError());
1419                 return -1;
1420         }
1421         return 0;
1422 }
1423
1424 char *getpass(const char *prompt)
1425 {
1426         struct strbuf buf = STRBUF_INIT;
1427
1428         fputs(prompt, stderr);
1429         for (;;) {
1430                 char c = _getch();
1431                 if (c == '\r' || c == '\n')
1432                         break;
1433                 strbuf_addch(&buf, c);
1434         }
1435         fputs("\n", stderr);
1436         return strbuf_detach(&buf, NULL);
1437 }
1438
1439 #ifndef NO_MINGW_REPLACE_READDIR
1440 /* MinGW readdir implementation to avoid extra lstats for Git */
1441 struct mingw_DIR
1442 {
1443         struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1444         struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1445         long                    dd_handle;      /* _findnext handle */
1446         int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1447         char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1448 };
1449
1450 struct dirent *mingw_readdir(DIR *dir)
1451 {
1452         WIN32_FIND_DATAA buf;
1453         HANDLE handle;
1454         struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1455
1456         if (!dir->dd_handle) {
1457                 errno = EBADF; /* No set_errno for mingw */
1458                 return NULL;
1459         }
1460
1461         if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1462         {
1463                 DWORD lasterr;
1464                 handle = FindFirstFileA(dir->dd_name, &buf);
1465                 lasterr = GetLastError();
1466                 dir->dd_handle = (long)handle;
1467                 if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1468                         errno = err_win_to_posix(lasterr);
1469                         return NULL;
1470                 }
1471         } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1472                 return NULL;
1473         } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1474                 DWORD lasterr = GetLastError();
1475                 FindClose((HANDLE)dir->dd_handle);
1476                 dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1477                 /* POSIX says you shouldn't set errno when readdir can't
1478                    find any more files; so, if another error we leave it set. */
1479                 if (lasterr != ERROR_NO_MORE_FILES)
1480                         errno = err_win_to_posix(lasterr);
1481                 return NULL;
1482         }
1483
1484         /* We get here if `buf' contains valid data.  */
1485         strcpy(dir->dd_dir.d_name, buf.cFileName);
1486         ++dir->dd_stat;
1487
1488         /* Set file type, based on WIN32_FIND_DATA */
1489         mdir->dd_dir.d_type = 0;
1490         if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1491                 mdir->dd_dir.d_type |= DT_DIR;
1492         else
1493                 mdir->dd_dir.d_type |= DT_REG;
1494
1495         return (struct dirent*)&dir->dd_dir;
1496 }
1497 #endif // !NO_MINGW_REPLACE_READDIR