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