compat/mingw.c

   1 #include "../git-compat-util.h"
   2 #include "win32.h"
   3 #include <conio.h>
   4 #include "../strbuf.h"
   5
   6 static 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 static inline time_t filetime_to_time_t(const FILETIME *ft)
 144 {
 145         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 146         winTime -= 116444736000000000LL; /* Windows to Unix Epoch conversion */
 147         winTime /= 10000000;             /* Nano to seconds resolution */
 148         return (time_t)winTime;
 149 }
 150
 151 /* We keep the do_lstat code in a separate function to avoid recursion.
 152  * When a path ends with a slash, the stat will fail with ENOENT. In
 153  * this case, we strip the trailing slashes and stat again.
 154  */
 155 static int do_lstat(const char *file_name, struct stat *buf)
 156 {
 157         WIN32_FILE_ATTRIBUTE_DATA fdata;
 158
 159         if (!(errno = get_file_attr(file_name, &fdata))) {
 160                 buf->st_ino = 0;
 161                 buf->st_gid = 0;
 162                 buf->st_uid = 0;
 163                 buf->st_nlink = 1;
 164                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 165                 buf->st_size = fdata.nFileSizeLow |
 166                         (((off_t)fdata.nFileSizeHigh)<<32);
 167                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 168                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 169                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 170                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 171                 return 0;
 172         }
 173         return -1;
 174 }
 175
 176 /* We provide our own lstat/fstat functions, since the provided
 177  * lstat/fstat functions are so slow. These stat functions are
 178  * tailored for Git's usage (read: fast), and are not meant to be
 179  * complete. Note that Git stat()s are redirected to mingw_lstat()
 180  * too, since Windows doesn't really handle symlinks that well.
 181  */
 182 int mingw_lstat(const char *file_name, struct stat *buf)
 183 {
 184         int namelen;
 185         static char alt_name[PATH_MAX];
 186
 187         if (!do_lstat(file_name, buf))
 188                 return 0;
 189
 190         /* if file_name ended in a '/', Windows returned ENOENT;
 191          * try again without trailing slashes
 192          */
 193         if (errno != ENOENT)
 194                 return -1;
 195
 196         namelen = strlen(file_name);
 197         if (namelen && file_name[namelen-1] != '/')
 198                 return -1;
 199         while (namelen && file_name[namelen-1] == '/')
 200                 --namelen;
 201         if (!namelen || namelen >= PATH_MAX)
 202                 return -1;
 203
 204         memcpy(alt_name, file_name, namelen);
 205         alt_name[namelen] = 0;
 206         return do_lstat(alt_name, buf);
 207 }
 208
 209 #undef fstat
 210 int mingw_fstat(int fd, struct stat *buf)
 211 {
 212         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 213         BY_HANDLE_FILE_INFORMATION fdata;
 214
 215         if (fh == INVALID_HANDLE_VALUE) {
 216                 errno = EBADF;
 217                 return -1;
 218         }
 219         /* direct non-file handles to MS's fstat() */
 220         if (GetFileType(fh) != FILE_TYPE_DISK)
 221                 return _fstati64(fd, buf);
 222
 223         if (GetFileInformationByHandle(fh, &fdata)) {
 224                 buf->st_ino = 0;
 225                 buf->st_gid = 0;
 226                 buf->st_uid = 0;
 227                 buf->st_nlink = 1;
 228                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 229                 buf->st_size = fdata.nFileSizeLow |
 230                         (((off_t)fdata.nFileSizeHigh)<<32);
 231                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 232                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 233                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 234                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 235                 return 0;
 236         }
 237         errno = EBADF;
 238         return -1;
 239 }
 240
 241 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 242 {
 243         long long winTime = t * 10000000LL + 116444736000000000LL;
 244         ft->dwLowDateTime = winTime;
 245         ft->dwHighDateTime = winTime >> 32;
 246 }
 247
 248 int mingw_utime (const char *file_name, const struct utimbuf *times)
 249 {
 250         FILETIME mft, aft;
 251         int fh, rc;
 252
 253         /* must have write permission */
 254         if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0)
 255                 return -1;
 256
 257         time_t_to_filetime(times->modtime, &mft);
 258         time_t_to_filetime(times->actime, &aft);
 259         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 260                 errno = EINVAL;
 261                 rc = -1;
 262         } else
 263                 rc = 0;
 264         close(fh);
 265         return rc;
 266 }
 267
 268 unsigned int sleep (unsigned int seconds)
 269 {
 270         Sleep(seconds*1000);
 271         return 0;
 272 }
 273
 274 int mkstemp(char *template)
 275 {
 276         char *filename = mktemp(template);
 277         if (filename == NULL)
 278                 return -1;
 279         return open(filename, O_RDWR | O_CREAT, 0600);
 280 }
 281
 282 int gettimeofday(struct timeval *tv, void *tz)
 283 {
 284         SYSTEMTIME st;
 285         struct tm tm;
 286         GetSystemTime(&st);
 287         tm.tm_year = st.wYear-1900;
 288         tm.tm_mon = st.wMonth-1;
 289         tm.tm_mday = st.wDay;
 290         tm.tm_hour = st.wHour;
 291         tm.tm_min = st.wMinute;
 292         tm.tm_sec = st.wSecond;
 293         tv->tv_sec = tm_to_time_t(&tm);
 294         if (tv->tv_sec < 0)
 295                 return -1;
 296         tv->tv_usec = st.wMilliseconds*1000;
 297         return 0;
 298 }
 299
 300 int pipe(int filedes[2])
 301 {
 302         HANDLE h[2];
 303
 304         /* this creates non-inheritable handles */
 305         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 306                 errno = err_win_to_posix(GetLastError());
 307                 return -1;
 308         }
 309         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 310         if (filedes[0] < 0) {
 311                 CloseHandle(h[0]);
 312                 CloseHandle(h[1]);
 313                 return -1;
 314         }
 315         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 316         if (filedes[0] < 0) {
 317                 close(filedes[0]);
 318                 CloseHandle(h[1]);
 319                 return -1;
 320         }
 321         return 0;
 322 }
 323
 324 int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 325 {
 326         int i, pending;
 327
 328         if (timeout >= 0) {
 329                 if (nfds == 0) {
 330                         Sleep(timeout);
 331                         return 0;
 332                 }
 333                 return errno = EINVAL, error("poll timeout not supported");
 334         }
 335
 336         /* When there is only one fd to wait for, then we pretend that
 337          * input is available and let the actual wait happen when the
 338          * caller invokes read().
 339          */
 340         if (nfds == 1) {
 341                 if (!(ufds[0].events & POLLIN))
 342                         return errno = EINVAL, error("POLLIN not set");
 343                 ufds[0].revents = POLLIN;
 344                 return 0;
 345         }
 346
 347 repeat:
 348         pending = 0;
 349         for (i = 0; i < nfds; i++) {
 350                 DWORD avail = 0;
 351                 HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 352                 if (h == INVALID_HANDLE_VALUE)
 353                         return -1;      /* errno was set */
 354
 355                 if (!(ufds[i].events & POLLIN))
 356                         return errno = EINVAL, error("POLLIN not set");
 357
 358                 /* this emulation works only for pipes */
 359                 if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 360                         int err = GetLastError();
 361                         if (err == ERROR_BROKEN_PIPE) {
 362                                 ufds[i].revents = POLLHUP;
 363                                 pending++;
 364                         } else {
 365                                 errno = EINVAL;
 366                                 return error("PeekNamedPipe failed,"
 367                                         " GetLastError: %u", err);
 368                         }
 369                 } else if (avail) {
 370                         ufds[i].revents = POLLIN;
 371                         pending++;
 372                 } else
 373                         ufds[i].revents = 0;
 374         }
 375         if (!pending) {
 376                 /* The only times that we spin here is when the process
 377                  * that is connected through the pipes is waiting for
 378                  * its own input data to become available. But since
 379                  * the process (pack-objects) is itself CPU intensive,
 380                  * it will happily pick up the time slice that we are
 381                  * relinquishing here.
 382                  */
 383                 Sleep(0);
 384                 goto repeat;
 385         }
 386         return 0;
 387 }
 388
 389 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 390 {
 391         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 392         memcpy(result, gmtime(timep), sizeof(struct tm));
 393         return result;
 394 }
 395
 396 struct tm *localtime_r(const time_t *timep, struct tm *result)
 397 {
 398         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 399         memcpy(result, localtime(timep), sizeof(struct tm));
 400         return result;
 401 }
 402
 403 #undef getcwd
 404 char *mingw_getcwd(char *pointer, int len)
 405 {
 406         int i;
 407         char *ret = getcwd(pointer, len);
 408         if (!ret)
 409                 return ret;
 410         for (i = 0; pointer[i]; i++)
 411                 if (pointer[i] == '\\')
 412                         pointer[i] = '/';
 413         return ret;
 414 }
 415
 416 #undef getenv
 417 char *mingw_getenv(const char *name)
 418 {
 419         char *result = getenv(name);
 420         if (!result && !strcmp(name, "TMPDIR")) {
 421                 /* on Windows it is TMP and TEMP */
 422                 result = getenv("TMP");
 423                 if (!result)
 424                         result = getenv("TEMP");
 425         }
 426         return result;
 427 }
 428
 429 /*
 430  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 431  * (Parsing C++ Command-Line Arguments)
 432  */
 433 static const char *quote_arg(const char *arg)
 434 {
 435         /* count chars to quote */
 436         int len = 0, n = 0;
 437         int force_quotes = 0;
 438         char *q, *d;
 439         const char *p = arg;
 440         if (!*p) force_quotes = 1;
 441         while (*p) {
 442                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 443                         force_quotes = 1;
 444                 else if (*p == '"')
 445                         n++;
 446                 else if (*p == '\\') {
 447                         int count = 0;
 448                         while (*p == '\\') {
 449                                 count++;
 450                                 p++;
 451                                 len++;
 452                         }
 453                         if (*p == '"')
 454                                 n += count*2 + 1;
 455                         continue;
 456                 }
 457                 len++;
 458                 p++;
 459         }
 460         if (!force_quotes && n == 0)
 461                 return arg;
 462
 463         /* insert \ where necessary */
 464         d = q = xmalloc(len+n+3);
 465         *d++ = '"';
 466         while (*arg) {
 467                 if (*arg == '"')
 468                         *d++ = '\\';
 469                 else if (*arg == '\\') {
 470                         int count = 0;
 471                         while (*arg == '\\') {
 472                                 count++;
 473                                 *d++ = *arg++;
 474                         }
 475                         if (*arg == '"') {
 476                                 while (count-- > 0)
 477                                         *d++ = '\\';
 478                                 *d++ = '\\';
 479                         }
 480                 }
 481                 *d++ = *arg++;
 482         }
 483         *d++ = '"';
 484         *d++ = 0;
 485         return q;
 486 }
 487
 488 static const char *parse_interpreter(const char *cmd)
 489 {
 490         static char buf[100];
 491         char *p, *opt;
 492         int n, fd;
 493
 494         /* don't even try a .exe */
 495         n = strlen(cmd);
 496         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 497                 return NULL;
 498
 499         fd = open(cmd, O_RDONLY);
 500         if (fd < 0)
 501                 return NULL;
 502         n = read(fd, buf, sizeof(buf)-1);
 503         close(fd);
 504         if (n < 4)      /* at least '#!/x' and not error */
 505                 return NULL;
 506
 507         if (buf[0] != '#' || buf[1] != '!')
 508                 return NULL;
 509         buf[n] = '\0';
 510         p = buf + strcspn(buf, "\r\n");
 511         if (!*p)
 512                 return NULL;
 513
 514         *p = '\0';
 515         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 516                 return NULL;
 517         /* strip options */
 518         if ((opt = strchr(p+1, ' ')))
 519                 *opt = '\0';
 520         return p+1;
 521 }
 522
 523 /*
 524  * Splits the PATH into parts.
 525  */
 526 static char **get_path_split(void)
 527 {
 528         char *p, **path, *envpath = getenv("PATH");
 529         int i, n = 0;
 530
 531         if (!envpath || !*envpath)
 532                 return NULL;
 533
 534         envpath = xstrdup(envpath);
 535         p = envpath;
 536         while (p) {
 537                 char *dir = p;
 538                 p = strchr(p, ';');
 539                 if (p) *p++ = '\0';
 540                 if (*dir) {     /* not earlier, catches series of ; */
 541                         ++n;
 542                 }
 543         }
 544         if (!n)
 545                 return NULL;
 546
 547         path = xmalloc((n+1)*sizeof(char *));
 548         p = envpath;
 549         i = 0;
 550         do {
 551                 if (*p)
 552                         path[i++] = xstrdup(p);
 553                 p = p+strlen(p)+1;
 554         } while (i < n);
 555         path[i] = NULL;
 556
 557         free(envpath);
 558
 559         return path;
 560 }
 561
 562 static void free_path_split(char **path)
 563 {
 564         char **p = path;
 565
 566         if (!path)
 567                 return;
 568
 569         while (*p)
 570                 free(*p++);
 571         free(path);
 572 }
 573
 574 /*
 575  * exe_only means that we only want to detect .exe files, but not scripts
 576  * (which do not have an extension)
 577  */
 578 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 579 {
 580         char path[MAX_PATH];
 581         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 582
 583         if (!isexe && access(path, F_OK) == 0)
 584                 return xstrdup(path);
 585         path[strlen(path)-4] = '\0';
 586         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 587                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 588                         return xstrdup(path);
 589         return NULL;
 590 }
 591
 592 /*
 593  * Determines the absolute path of cmd using the the split path in path.
 594  * If cmd contains a slash or backslash, no lookup is performed.
 595  */
 596 static char *path_lookup(const char *cmd, char **path, int exe_only)
 597 {
 598         char *prog = NULL;
 599         int len = strlen(cmd);
 600         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 601
 602         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 603                 prog = xstrdup(cmd);
 604
 605         while (!prog && *path)
 606                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 607
 608         return prog;
 609 }
 610
 611 static int env_compare(const void *a, const void *b)
 612 {
 613         char *const *ea = a;
 614         char *const *eb = b;
 615         return strcasecmp(*ea, *eb);
 616 }
 617
 618 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 619                            int prepend_cmd)
 620 {
 621         STARTUPINFO si;
 622         PROCESS_INFORMATION pi;
 623         struct strbuf envblk, args;
 624         unsigned flags;
 625         BOOL ret;
 626
 627         /* Determine whether or not we are associated to a console */
 628         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 629                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 630                         FILE_ATTRIBUTE_NORMAL, NULL);
 631         if (cons == INVALID_HANDLE_VALUE) {
 632                 /* There is no console associated with this process.
 633                  * Since the child is a console process, Windows
 634                  * would normally create a console window. But
 635                  * since we'll be redirecting std streams, we do
 636                  * not need the console.
 637                  * It is necessary to use DETACHED_PROCESS
 638                  * instead of CREATE_NO_WINDOW to make ssh
 639                  * recognize that it has no console.
 640                  */
 641                 flags = DETACHED_PROCESS;
 642         } else {
 643                 /* There is already a console. If we specified
 644                  * DETACHED_PROCESS here, too, Windows would
 645                  * disassociate the child from the console.
 646                  * The same is true for CREATE_NO_WINDOW.
 647                  * Go figure!
 648                  */
 649                 flags = 0;
 650                 CloseHandle(cons);
 651         }
 652         memset(&si, 0, sizeof(si));
 653         si.cb = sizeof(si);
 654         si.dwFlags = STARTF_USESTDHANDLES;
 655         si.hStdInput = (HANDLE) _get_osfhandle(0);
 656         si.hStdOutput = (HANDLE) _get_osfhandle(1);
 657         si.hStdError = (HANDLE) _get_osfhandle(2);
 658
 659         /* concatenate argv, quoting args as we go */
 660         strbuf_init(&args, 0);
 661         if (prepend_cmd) {
 662                 char *quoted = (char *)quote_arg(cmd);
 663                 strbuf_addstr(&args, quoted);
 664                 if (quoted != cmd)
 665                         free(quoted);
 666         }
 667         for (; *argv; argv++) {
 668                 char *quoted = (char *)quote_arg(*argv);
 669                 if (*args.buf)
 670                         strbuf_addch(&args, ' ');
 671                 strbuf_addstr(&args, quoted);
 672                 if (quoted != *argv)
 673                         free(quoted);
 674         }
 675
 676         if (env) {
 677                 int count = 0;
 678                 char **e, **sorted_env;
 679
 680                 for (e = env; *e; e++)
 681                         count++;
 682
 683                 /* environment must be sorted */
 684                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 685                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 686                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 687
 688                 strbuf_init(&envblk, 0);
 689                 for (e = sorted_env; *e; e++) {
 690                         strbuf_addstr(&envblk, *e);
 691                         strbuf_addch(&envblk, '\0');
 692                 }
 693                 free(sorted_env);
 694         }
 695
 696         memset(&pi, 0, sizeof(pi));
 697         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 698                 env ? envblk.buf : NULL, NULL, &si, &pi);
 699
 700         if (env)
 701                 strbuf_release(&envblk);
 702         strbuf_release(&args);
 703
 704         if (!ret) {
 705                 errno = ENOENT;
 706                 return -1;
 707         }
 708         CloseHandle(pi.hThread);
 709         return (pid_t)pi.hProcess;
 710 }
 711
 712 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env)
 713 {
 714         pid_t pid;
 715         char **path = get_path_split();
 716         char *prog = path_lookup(cmd, path, 0);
 717
 718         if (!prog) {
 719                 errno = ENOENT;
 720                 pid = -1;
 721         }
 722         else {
 723                 const char *interpr = parse_interpreter(prog);
 724
 725                 if (interpr) {
 726                         const char *argv0 = argv[0];
 727                         char *iprog = path_lookup(interpr, path, 1);
 728                         argv[0] = prog;
 729                         if (!iprog) {
 730                                 errno = ENOENT;
 731                                 pid = -1;
 732                         }
 733                         else {
 734                                 pid = mingw_spawnve(iprog, argv, env, 1);
 735                                 free(iprog);
 736                         }
 737                         argv[0] = argv0;
 738                 }
 739                 else
 740                         pid = mingw_spawnve(prog, argv, env, 0);
 741                 free(prog);
 742         }
 743         free_path_split(path);
 744         return pid;
 745 }
 746
 747 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 748 {
 749         const char *interpr = parse_interpreter(cmd);
 750         char **path;
 751         char *prog;
 752         int pid = 0;
 753
 754         if (!interpr)
 755                 return 0;
 756         path = get_path_split();
 757         prog = path_lookup(interpr, path, 1);
 758         if (prog) {
 759                 int argc = 0;
 760                 const char **argv2;
 761                 while (argv[argc]) argc++;
 762                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
 763                 argv2[0] = (char *)cmd; /* full path to the script file */
 764                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 765                 pid = mingw_spawnve(prog, argv2, env, 1);
 766                 if (pid >= 0) {
 767                         int status;
 768                         if (waitpid(pid, &status, 0) < 0)
 769                                 status = 255;
 770                         exit(status);
 771                 }
 772                 pid = 1;        /* indicate that we tried but failed */
 773                 free(prog);
 774                 free(argv2);
 775         }
 776         free_path_split(path);
 777         return pid;
 778 }
 779
 780 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 781 {
 782         /* check if git_command is a shell script */
 783         if (!try_shell_exec(cmd, argv, (char **)env)) {
 784                 int pid, status;
 785
 786                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 787                 if (pid < 0)
 788                         return;
 789                 if (waitpid(pid, &status, 0) < 0)
 790                         status = 255;
 791                 exit(status);
 792         }
 793 }
 794
 795 void mingw_execvp(const char *cmd, char *const *argv)
 796 {
 797         char **path = get_path_split();
 798         char *prog = path_lookup(cmd, path, 0);
 799
 800         if (prog) {
 801                 mingw_execve(prog, argv, environ);
 802                 free(prog);
 803         } else
 804                 errno = ENOENT;
 805
 806         free_path_split(path);
 807 }
 808
 809 static char **copy_environ(void)
 810 {
 811         char **env;
 812         int i = 0;
 813         while (environ[i])
 814                 i++;
 815         env = xmalloc((i+1)*sizeof(*env));
 816         for (i = 0; environ[i]; i++)
 817                 env[i] = xstrdup(environ[i]);
 818         env[i] = NULL;
 819         return env;
 820 }
 821
 822 void free_environ(char **env)
 823 {
 824         int i;
 825         for (i = 0; env[i]; i++)
 826                 free(env[i]);
 827         free(env);
 828 }
 829
 830 static int lookup_env(char **env, const char *name, size_t nmln)
 831 {
 832         int i;
 833
 834         for (i = 0; env[i]; i++) {
 835                 if (0 == strncmp(env[i], name, nmln)
 836                     && '=' == env[i][nmln])
 837                         /* matches */
 838                         return i;
 839         }
 840         return -1;
 841 }
 842
 843 /*
 844  * If name contains '=', then sets the variable, otherwise it unsets it
 845  */
 846 static char **env_setenv(char **env, const char *name)
 847 {
 848         char *eq = strchrnul(name, '=');
 849         int i = lookup_env(env, name, eq-name);
 850
 851         if (i < 0) {
 852                 if (*eq) {
 853                         for (i = 0; env[i]; i++)
 854                                 ;
 855                         env = xrealloc(env, (i+2)*sizeof(*env));
 856                         env[i] = xstrdup(name);
 857                         env[i+1] = NULL;
 858                 }
 859         }
 860         else {
 861                 free(env[i]);
 862                 if (*eq)
 863                         env[i] = xstrdup(name);
 864                 else
 865                         for (; env[i]; i++)
 866                                 env[i] = env[i+1];
 867         }
 868         return env;
 869 }
 870
 871 /*
 872  * Copies global environ and adjusts variables as specified by vars.
 873  */
 874 char **make_augmented_environ(const char *const *vars)
 875 {
 876         char **env = copy_environ();
 877
 878         while (*vars)
 879                 env = env_setenv(env, *vars++);
 880         return env;
 881 }
 882
 883 /*
 884  * Note, this isn't a complete replacement for getaddrinfo. It assumes
 885  * that service contains a numerical port, or that it it is null. It
 886  * does a simple search using gethostbyname, and returns one IPv4 host
 887  * if one was found.
 888  */
 889 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
 890                                    const struct addrinfo *hints,
 891                                    struct addrinfo **res)
 892 {
 893         struct hostent *h = gethostbyname(node);
 894         struct addrinfo *ai;
 895         struct sockaddr_in *sin;
 896
 897         if (!h)
 898                 return WSAGetLastError();
 899
 900         ai = xmalloc(sizeof(struct addrinfo));
 901         *res = ai;
 902         ai->ai_flags = 0;
 903         ai->ai_family = AF_INET;
 904         ai->ai_socktype = hints->ai_socktype;
 905         switch (hints->ai_socktype) {
 906         case SOCK_STREAM:
 907                 ai->ai_protocol = IPPROTO_TCP;
 908                 break;
 909         case SOCK_DGRAM:
 910                 ai->ai_protocol = IPPROTO_UDP;
 911                 break;
 912         default:
 913                 ai->ai_protocol = 0;
 914                 break;
 915         }
 916         ai->ai_addrlen = sizeof(struct sockaddr_in);
 917         ai->ai_canonname = strdup(h->h_name);
 918
 919         sin = xmalloc(ai->ai_addrlen);
 920         memset(sin, 0, ai->ai_addrlen);
 921         sin->sin_family = AF_INET;
 922         if (service)
 923                 sin->sin_port = htons(atoi(service));
 924         sin->sin_addr = *(struct in_addr *)h->h_addr;
 925         ai->ai_addr = (struct sockaddr *)sin;
 926         ai->ai_next = 0;
 927         return 0;
 928 }
 929
 930 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
 931 {
 932         free(res->ai_canonname);
 933         free(res->ai_addr);
 934         free(res);
 935 }
 936
 937 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
 938                                    char *host, DWORD hostlen,
 939                                    char *serv, DWORD servlen, int flags)
 940 {
 941         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
 942         if (sa->sa_family != AF_INET)
 943                 return EAI_FAMILY;
 944         if (!host && !serv)
 945                 return EAI_NONAME;
 946
 947         if (host && hostlen > 0) {
 948                 struct hostent *ent = NULL;
 949                 if (!(flags & NI_NUMERICHOST))
 950                         ent = gethostbyaddr((const char *)&sin->sin_addr,
 951                                             sizeof(sin->sin_addr), AF_INET);
 952
 953                 if (ent)
 954                         snprintf(host, hostlen, "%s", ent->h_name);
 955                 else if (flags & NI_NAMEREQD)
 956                         return EAI_NONAME;
 957                 else
 958                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
 959         }
 960
 961         if (serv && servlen > 0) {
 962                 struct servent *ent = NULL;
 963                 if (!(flags & NI_NUMERICSERV))
 964                         ent = getservbyport(sin->sin_port,
 965                                             flags & NI_DGRAM ? "udp" : "tcp");
 966
 967                 if (ent)
 968                         snprintf(serv, servlen, "%s", ent->s_name);
 969                 else
 970                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
 971         }
 972
 973         return 0;
 974 }
 975
 976 static HMODULE ipv6_dll = NULL;
 977 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
 978 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
 979                                       const struct addrinfo *hints,
 980                                       struct addrinfo **res);
 981 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
 982                                       char *host, DWORD hostlen,
 983                                       char *serv, DWORD servlen, int flags);
 984 /*
 985  * gai_strerror is an inline function in the ws2tcpip.h header, so we
 986  * don't need to try to load that one dynamically.
 987  */
 988
 989 static void socket_cleanup(void)
 990 {
 991         WSACleanup();
 992         if (ipv6_dll)
 993                 FreeLibrary(ipv6_dll);
 994         ipv6_dll = NULL;
 995         ipv6_freeaddrinfo = freeaddrinfo_stub;
 996         ipv6_getaddrinfo = getaddrinfo_stub;
 997         ipv6_getnameinfo = getnameinfo_stub;
 998 }
 999
1000 static void ensure_socket_initialization(void)
1001 {
1002         WSADATA wsa;
1003         static int initialized = 0;
1004         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1005         const char **name;
1006
1007         if (initialized)
1008                 return;
1009
1010         if (WSAStartup(MAKEWORD(2,2), &wsa))
1011                 die("unable to initialize winsock subsystem, error %d",
1012                         WSAGetLastError());
1013
1014         for (name = libraries; *name; name++) {
1015                 ipv6_dll = LoadLibrary(*name);
1016                 if (!ipv6_dll)
1017                         continue;
1018
1019                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1020                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1021                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1022                                                    const struct addrinfo *,
1023                                                    struct addrinfo **))
1024                         GetProcAddress(ipv6_dll, "getaddrinfo");
1025                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1026                                                    socklen_t, char *, DWORD,
1027                                                    char *, DWORD, int))
1028                         GetProcAddress(ipv6_dll, "getnameinfo");
1029                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1030                         FreeLibrary(ipv6_dll);
1031                         ipv6_dll = NULL;
1032                 } else
1033                         break;
1034         }
1035         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1036                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1037                 ipv6_getaddrinfo = getaddrinfo_stub;
1038                 ipv6_getnameinfo = getnameinfo_stub;
1039         }
1040
1041         atexit(socket_cleanup);
1042         initialized = 1;
1043 }
1044
1045 #undef gethostbyname
1046 struct hostent *mingw_gethostbyname(const char *host)
1047 {
1048         ensure_socket_initialization();
1049         return gethostbyname(host);
1050 }
1051
1052 void mingw_freeaddrinfo(struct addrinfo *res)
1053 {
1054         ipv6_freeaddrinfo(res);
1055 }
1056
1057 int mingw_getaddrinfo(const char *node, const char *service,
1058                       const struct addrinfo *hints, struct addrinfo **res)
1059 {
1060         ensure_socket_initialization();
1061         return ipv6_getaddrinfo(node, service, hints, res);
1062 }
1063
1064 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1065                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1066                       int flags)
1067 {
1068         ensure_socket_initialization();
1069         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1070 }
1071
1072 int mingw_socket(int domain, int type, int protocol)
1073 {
1074         int sockfd;
1075         SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
1076         if (s == INVALID_SOCKET) {
1077                 /*
1078                  * WSAGetLastError() values are regular BSD error codes
1079                  * biased by WSABASEERR.
1080                  * However, strerror() does not know about networking
1081                  * specific errors, which are values beginning at 38 or so.
1082                  * Therefore, we choose to leave the biased error code
1083                  * in errno so that _if_ someone looks up the code somewhere,
1084                  * then it is at least the number that are usually listed.
1085                  */
1086                 errno = WSAGetLastError();
1087                 return -1;
1088         }
1089         /* convert into a file descriptor */
1090         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1091                 closesocket(s);
1092                 return error("unable to make a socket file descriptor: %s",
1093                         strerror(errno));
1094         }
1095         return sockfd;
1096 }
1097
1098 #undef connect
1099 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1100 {
1101         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1102         return connect(s, sa, sz);
1103 }
1104
1105 #undef rename
1106 int mingw_rename(const char *pold, const char *pnew)
1107 {
1108         DWORD attrs, gle;
1109         int tries = 0;
1110         static const int delay[] = { 0, 1, 10, 20, 40 };
1111
1112         /*
1113          * Try native rename() first to get errno right.
1114          * It is based on MoveFile(), which cannot overwrite existing files.
1115          */
1116         if (!rename(pold, pnew))
1117                 return 0;
1118         if (errno != EEXIST)
1119                 return -1;
1120 repeat:
1121         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1122                 return 0;
1123         /* TODO: translate more errors */
1124         gle = GetLastError();
1125         if (gle == ERROR_ACCESS_DENIED &&
1126             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1127                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1128                         errno = EISDIR;
1129                         return -1;
1130                 }
1131                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1132                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1133                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1134                                 return 0;
1135                         gle = GetLastError();
1136                         /* revert file attributes on failure */
1137                         SetFileAttributes(pnew, attrs);
1138                 }
1139         }
1140         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1141                 /*
1142                  * We assume that some other process had the source or
1143                  * destination file open at the wrong moment and retry.
1144                  * In order to give the other process a higher chance to
1145                  * complete its operation, we give up our time slice now.
1146                  * If we have to retry again, we do sleep a bit.
1147                  */
1148                 Sleep(delay[tries]);
1149                 tries++;
1150                 goto repeat;
1151         }
1152         errno = EACCES;
1153         return -1;
1154 }
1155
1156 /*
1157  * Note that this doesn't return the actual pagesize, but
1158  * the allocation granularity. If future Windows specific git code
1159  * needs the real getpagesize function, we need to find another solution.
1160  */
1161 int mingw_getpagesize(void)
1162 {
1163         SYSTEM_INFO si;
1164         GetSystemInfo(&si);
1165         return si.dwAllocationGranularity;
1166 }
1167
1168 struct passwd *getpwuid(int uid)
1169 {
1170         static char user_name[100];
1171         static struct passwd p;
1172
1173         DWORD len = sizeof(user_name);
1174         if (!GetUserName(user_name, &len))
1175                 return NULL;
1176         p.pw_name = user_name;
1177         p.pw_gecos = "unknown";
1178         p.pw_dir = NULL;
1179         return &p;
1180 }
1181
1182 static HANDLE timer_event;
1183 static HANDLE timer_thread;
1184 static int timer_interval;
1185 static int one_shot;
1186 static sig_handler_t timer_fn = SIG_DFL;
1187
1188 /* The timer works like this:
1189  * The thread, ticktack(), is a trivial routine that most of the time
1190  * only waits to receive the signal to terminate. The main thread tells
1191  * the thread to terminate by setting the timer_event to the signalled
1192  * state.
1193  * But ticktack() interrupts the wait state after the timer's interval
1194  * length to call the signal handler.
1195  */
1196
1197 static unsigned __stdcall ticktack(void *dummy)
1198 {
1199         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1200                 if (timer_fn == SIG_DFL)
1201                         die("Alarm");
1202                 if (timer_fn != SIG_IGN)
1203                         timer_fn(SIGALRM);
1204                 if (one_shot)
1205                         break;
1206         }
1207         return 0;
1208 }
1209
1210 static int start_timer_thread(void)
1211 {
1212         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1213         if (timer_event) {
1214                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1215                 if (!timer_thread )
1216                         return errno = ENOMEM,
1217                                 error("cannot start timer thread");
1218         } else
1219                 return errno = ENOMEM,
1220                         error("cannot allocate resources for timer");
1221         return 0;
1222 }
1223
1224 static void stop_timer_thread(void)
1225 {
1226         if (timer_event)
1227                 SetEvent(timer_event);  /* tell thread to terminate */
1228         if (timer_thread) {
1229                 int rc = WaitForSingleObject(timer_thread, 1000);
1230                 if (rc == WAIT_TIMEOUT)
1231                         error("timer thread did not terminate timely");
1232                 else if (rc != WAIT_OBJECT_0)
1233                         error("waiting for timer thread failed: %lu",
1234                               GetLastError());
1235                 CloseHandle(timer_thread);
1236         }
1237         if (timer_event)
1238                 CloseHandle(timer_event);
1239         timer_event = NULL;
1240         timer_thread = NULL;
1241 }
1242
1243 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1244 {
1245         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1246 }
1247
1248 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1249 {
1250         static const struct timeval zero;
1251         static int atexit_done;
1252
1253         if (out != NULL)
1254                 return errno = EINVAL,
1255                         error("setitimer param 3 != NULL not implemented");
1256         if (!is_timeval_eq(&in->it_interval, &zero) &&
1257             !is_timeval_eq(&in->it_interval, &in->it_value))
1258                 return errno = EINVAL,
1259                         error("setitimer: it_interval must be zero or eq it_value");
1260
1261         if (timer_thread)
1262                 stop_timer_thread();
1263
1264         if (is_timeval_eq(&in->it_value, &zero) &&
1265             is_timeval_eq(&in->it_interval, &zero))
1266                 return 0;
1267
1268         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1269         one_shot = is_timeval_eq(&in->it_interval, &zero);
1270         if (!atexit_done) {
1271                 atexit(stop_timer_thread);
1272                 atexit_done = 1;
1273         }
1274         return start_timer_thread();
1275 }
1276
1277 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1278 {
1279         if (sig != SIGALRM)
1280                 return errno = EINVAL,
1281                         error("sigaction only implemented for SIGALRM");
1282         if (out != NULL)
1283                 return errno = EINVAL,
1284                         error("sigaction: param 3 != NULL not implemented");
1285
1286         timer_fn = in->sa_handler;
1287         return 0;
1288 }
1289
1290 #undef signal
1291 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1292 {
1293         sig_handler_t old = timer_fn;
1294         if (sig != SIGALRM)
1295                 return signal(sig, handler);
1296         timer_fn = handler;
1297         return old;
1298 }
1299
1300 static const char *make_backslash_path(const char *path)
1301 {
1302         static char buf[PATH_MAX + 1];
1303         char *c;
1304
1305         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1306                 die("Too long path: %.*s", 60, path);
1307
1308         for (c = buf; *c; c++) {
1309                 if (*c == '/')
1310                         *c = '\\';
1311         }
1312         return buf;
1313 }
1314
1315 void mingw_open_html(const char *unixpath)
1316 {
1317         const char *htmlpath = make_backslash_path(unixpath);
1318         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1319                         const char *, const char *, const char *, INT);
1320         T ShellExecute;
1321         HMODULE shell32;
1322
1323         shell32 = LoadLibrary("shell32.dll");
1324         if (!shell32)
1325                 die("cannot load shell32.dll");
1326         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1327         if (!ShellExecute)
1328                 die("cannot run browser");
1329
1330         printf("Launching default browser to display HTML ...\n");
1331         ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1332
1333         FreeLibrary(shell32);
1334 }
1335
1336 int link(const char *oldpath, const char *newpath)
1337 {
1338         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1339         static T create_hard_link = NULL;
1340         if (!create_hard_link) {
1341                 create_hard_link = (T) GetProcAddress(
1342                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1343                 if (!create_hard_link)
1344                         create_hard_link = (T)-1;
1345         }
1346         if (create_hard_link == (T)-1) {
1347                 errno = ENOSYS;
1348                 return -1;
1349         }
1350         if (!create_hard_link(newpath, oldpath, NULL)) {
1351                 errno = err_win_to_posix(GetLastError());
1352                 return -1;
1353         }
1354         return 0;
1355 }
1356
1357 char *getpass(const char *prompt)
1358 {
1359         struct strbuf buf = STRBUF_INIT;
1360
1361         fputs(prompt, stderr);
1362         for (;;) {
1363                 char c = _getch();
1364                 if (c == '\r' || c == '\n')
1365                         break;
1366                 strbuf_addch(&buf, c);
1367         }
1368         fputs("\n", stderr);
1369         return strbuf_detach(&buf, NULL);
1370 }
1371
1372 #ifndef NO_MINGW_REPLACE_READDIR
1373 /* MinGW readdir implementation to avoid extra lstats for Git */
1374 struct mingw_DIR
1375 {
1376         struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1377         struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1378         long                    dd_handle;      /* _findnext handle */
1379         int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1380         char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1381 };
1382
1383 struct dirent *mingw_readdir(DIR *dir)
1384 {
1385         WIN32_FIND_DATAA buf;
1386         HANDLE handle;
1387         struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1388
1389         if (!dir->dd_handle) {
1390                 errno = EBADF; /* No set_errno for mingw */
1391                 return NULL;
1392         }
1393
1394         if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1395         {
1396                 DWORD lasterr;
1397                 handle = FindFirstFileA(dir->dd_name, &buf);
1398                 lasterr = GetLastError();
1399                 dir->dd_handle = (long)handle;
1400                 if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1401                         errno = err_win_to_posix(lasterr);
1402                         return NULL;
1403                 }
1404         } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1405                 return NULL;
1406         } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1407                 DWORD lasterr = GetLastError();
1408                 FindClose((HANDLE)dir->dd_handle);
1409                 dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1410                 /* POSIX says you shouldn't set errno when readdir can't
1411                    find any more files; so, if another error we leave it set. */
1412                 if (lasterr != ERROR_NO_MORE_FILES)
1413                         errno = err_win_to_posix(lasterr);
1414                 return NULL;
1415         }
1416
1417         /* We get here if `buf' contains valid data.  */
1418         strcpy(dir->dd_dir.d_name, buf.cFileName);
1419         ++dir->dd_stat;
1420
1421         /* Set file type, based on WIN32_FIND_DATA */
1422         mdir->dd_dir.d_type = 0;
1423         if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1424                 mdir->dd_dir.d_type |= DT_DIR;
1425         else
1426                 mdir->dd_dir.d_type |= DT_REG;
1427
1428         return (struct dirent*)&dir->dd_dir;
1429 }
1430 #endif // !NO_MINGW_REPLACE_READDIR