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