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 (filename && !strcmp(filename, "/dev/null"))
 131                 filename = "nul";
 132
 133         fd = open(filename, oflags, mode);
 134
 135         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 136                 DWORD attrs = GetFileAttributes(filename);
 137                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 138                         errno = EISDIR;
 139         }
 140         return fd;
 141 }
 142
 143 #undef write
 144 ssize_t mingw_write(int fd, const void *buf, size_t count)
 145 {
 146         /*
 147          * While write() calls to a file on a local disk are translated
 148          * into WriteFile() calls with a maximum size of 64KB on Windows
 149          * XP and 256KB on Vista, no such cap is placed on writes to
 150          * files over the network on Windows XP.  Unfortunately, there
 151          * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 152          * bigger writes fail on Windows XP.
 153          * So we cap to a nice 31MB here to avoid write failures over
 154          * the net without changing the number of WriteFile() calls in
 155          * the local case.
 156          */
 157         return write(fd, buf, min(count, 31 * 1024 * 1024));
 158 }
 159
 160 #undef fopen
 161 FILE *mingw_fopen (const char *filename, const char *otype)
 162 {
 163         if (filename && !strcmp(filename, "/dev/null"))
 164                 filename = "nul";
 165         return fopen(filename, otype);
 166 }
 167
 168 #undef freopen
 169 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 170 {
 171         if (filename && !strcmp(filename, "/dev/null"))
 172                 filename = "nul";
 173         return freopen(filename, otype, stream);
 174 }
 175
 176 /*
 177  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 178  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 179  */
 180 static inline long long filetime_to_hnsec(const FILETIME *ft)
 181 {
 182         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 183         /* Windows to Unix Epoch conversion */
 184         return winTime - 116444736000000000LL;
 185 }
 186
 187 static inline time_t filetime_to_time_t(const FILETIME *ft)
 188 {
 189         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 190 }
 191
 192 /* We keep the do_lstat code in a separate function to avoid recursion.
 193  * When a path ends with a slash, the stat will fail with ENOENT. In
 194  * this case, we strip the trailing slashes and stat again.
 195  *
 196  * If follow is true then act like stat() and report on the link
 197  * target. Otherwise report on the link itself.
 198  */
 199 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 200 {
 201         int err;
 202         WIN32_FILE_ATTRIBUTE_DATA fdata;
 203
 204         if (!(err = get_file_attr(file_name, &fdata))) {
 205                 buf->st_ino = 0;
 206                 buf->st_gid = 0;
 207                 buf->st_uid = 0;
 208                 buf->st_nlink = 1;
 209                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 210                 buf->st_size = fdata.nFileSizeLow |
 211                         (((off_t)fdata.nFileSizeHigh)<<32);
 212                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 213                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 214                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 215                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 216                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 217                         WIN32_FIND_DATAA findbuf;
 218                         HANDLE handle = FindFirstFileA(file_name, &findbuf);
 219                         if (handle != INVALID_HANDLE_VALUE) {
 220                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 221                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 222                                         if (follow) {
 223                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 224                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 225                                         } else {
 226                                                 buf->st_mode = S_IFLNK;
 227                                         }
 228                                         buf->st_mode |= S_IREAD;
 229                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 230                                                 buf->st_mode |= S_IWRITE;
 231                                 }
 232                                 FindClose(handle);
 233                         }
 234                 }
 235                 return 0;
 236         }
 237         errno = err;
 238         return -1;
 239 }
 240
 241 /* We provide our own lstat/fstat functions, since the provided
 242  * lstat/fstat functions are so slow. These stat functions are
 243  * tailored for Git's usage (read: fast), and are not meant to be
 244  * complete. Note that Git stat()s are redirected to mingw_lstat()
 245  * too, since Windows doesn't really handle symlinks that well.
 246  */
 247 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 248 {
 249         int namelen;
 250         static char alt_name[PATH_MAX];
 251
 252         if (!do_lstat(follow, file_name, buf))
 253                 return 0;
 254
 255         /* if file_name ended in a '/', Windows returned ENOENT;
 256          * try again without trailing slashes
 257          */
 258         if (errno != ENOENT)
 259                 return -1;
 260
 261         namelen = strlen(file_name);
 262         if (namelen && file_name[namelen-1] != '/')
 263                 return -1;
 264         while (namelen && file_name[namelen-1] == '/')
 265                 --namelen;
 266         if (!namelen || namelen >= PATH_MAX)
 267                 return -1;
 268
 269         memcpy(alt_name, file_name, namelen);
 270         alt_name[namelen] = 0;
 271         return do_lstat(follow, alt_name, buf);
 272 }
 273
 274 int mingw_lstat(const char *file_name, struct stat *buf)
 275 {
 276         return do_stat_internal(0, file_name, buf);
 277 }
 278 int mingw_stat(const char *file_name, struct stat *buf)
 279 {
 280         return do_stat_internal(1, file_name, buf);
 281 }
 282
 283 #undef fstat
 284 int mingw_fstat(int fd, struct stat *buf)
 285 {
 286         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 287         BY_HANDLE_FILE_INFORMATION fdata;
 288
 289         if (fh == INVALID_HANDLE_VALUE) {
 290                 errno = EBADF;
 291                 return -1;
 292         }
 293         /* direct non-file handles to MS's fstat() */
 294         if (GetFileType(fh) != FILE_TYPE_DISK)
 295                 return _fstati64(fd, buf);
 296
 297         if (GetFileInformationByHandle(fh, &fdata)) {
 298                 buf->st_ino = 0;
 299                 buf->st_gid = 0;
 300                 buf->st_uid = 0;
 301                 buf->st_nlink = 1;
 302                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 303                 buf->st_size = fdata.nFileSizeLow |
 304                         (((off_t)fdata.nFileSizeHigh)<<32);
 305                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 306                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 307                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 308                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 309                 return 0;
 310         }
 311         errno = EBADF;
 312         return -1;
 313 }
 314
 315 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 316 {
 317         long long winTime = t * 10000000LL + 116444736000000000LL;
 318         ft->dwLowDateTime = winTime;
 319         ft->dwHighDateTime = winTime >> 32;
 320 }
 321
 322 int mingw_utime (const char *file_name, const struct utimbuf *times)
 323 {
 324         FILETIME mft, aft;
 325         int fh, rc;
 326
 327         /* must have write permission */
 328         DWORD attrs = GetFileAttributes(file_name);
 329         if (attrs != INVALID_FILE_ATTRIBUTES &&
 330             (attrs & FILE_ATTRIBUTE_READONLY)) {
 331                 /* ignore errors here; open() will report them */
 332                 SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 333         }
 334
 335         if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 336                 rc = -1;
 337                 goto revert_attrs;
 338         }
 339
 340         if (times) {
 341                 time_t_to_filetime(times->modtime, &mft);
 342                 time_t_to_filetime(times->actime, &aft);
 343         } else {
 344                 GetSystemTimeAsFileTime(&mft);
 345                 aft = mft;
 346         }
 347         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 348                 errno = EINVAL;
 349                 rc = -1;
 350         } else
 351                 rc = 0;
 352         close(fh);
 353
 354 revert_attrs:
 355         if (attrs != INVALID_FILE_ATTRIBUTES &&
 356             (attrs & FILE_ATTRIBUTE_READONLY)) {
 357                 /* ignore errors again */
 358                 SetFileAttributes(file_name, attrs);
 359         }
 360         return rc;
 361 }
 362
 363 unsigned int sleep (unsigned int seconds)
 364 {
 365         Sleep(seconds*1000);
 366         return 0;
 367 }
 368
 369 int mkstemp(char *template)
 370 {
 371         char *filename = mktemp(template);
 372         if (filename == NULL)
 373                 return -1;
 374         return open(filename, O_RDWR | O_CREAT, 0600);
 375 }
 376
 377 int gettimeofday(struct timeval *tv, void *tz)
 378 {
 379         FILETIME ft;
 380         long long hnsec;
 381
 382         GetSystemTimeAsFileTime(&ft);
 383         hnsec = filetime_to_hnsec(&ft);
 384         tv->tv_sec = hnsec / 10000000;
 385         tv->tv_usec = (hnsec % 10000000) / 10;
 386         return 0;
 387 }
 388
 389 int pipe(int filedes[2])
 390 {
 391         HANDLE h[2];
 392
 393         /* this creates non-inheritable handles */
 394         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 395                 errno = err_win_to_posix(GetLastError());
 396                 return -1;
 397         }
 398         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 399         if (filedes[0] < 0) {
 400                 CloseHandle(h[0]);
 401                 CloseHandle(h[1]);
 402                 return -1;
 403         }
 404         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 405         if (filedes[0] < 0) {
 406                 close(filedes[0]);
 407                 CloseHandle(h[1]);
 408                 return -1;
 409         }
 410         return 0;
 411 }
 412
 413 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 414 {
 415         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 416         memcpy(result, gmtime(timep), sizeof(struct tm));
 417         return result;
 418 }
 419
 420 struct tm *localtime_r(const time_t *timep, struct tm *result)
 421 {
 422         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 423         memcpy(result, localtime(timep), sizeof(struct tm));
 424         return result;
 425 }
 426
 427 #undef getcwd
 428 char *mingw_getcwd(char *pointer, int len)
 429 {
 430         int i;
 431         char *ret = getcwd(pointer, len);
 432         if (!ret)
 433                 return ret;
 434         for (i = 0; pointer[i]; i++)
 435                 if (pointer[i] == '\\')
 436                         pointer[i] = '/';
 437         return ret;
 438 }
 439
 440 #undef getenv
 441 char *mingw_getenv(const char *name)
 442 {
 443         char *result = getenv(name);
 444         if (!result && !strcmp(name, "TMPDIR")) {
 445                 /* on Windows it is TMP and TEMP */
 446                 result = getenv("TMP");
 447                 if (!result)
 448                         result = getenv("TEMP");
 449         }
 450         return result;
 451 }
 452
 453 /*
 454  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 455  * (Parsing C++ Command-Line Arguments)
 456  */
 457 static const char *quote_arg(const char *arg)
 458 {
 459         /* count chars to quote */
 460         int len = 0, n = 0;
 461         int force_quotes = 0;
 462         char *q, *d;
 463         const char *p = arg;
 464         if (!*p) force_quotes = 1;
 465         while (*p) {
 466                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 467                         force_quotes = 1;
 468                 else if (*p == '"')
 469                         n++;
 470                 else if (*p == '\\') {
 471                         int count = 0;
 472                         while (*p == '\\') {
 473                                 count++;
 474                                 p++;
 475                                 len++;
 476                         }
 477                         if (*p == '"')
 478                                 n += count*2 + 1;
 479                         continue;
 480                 }
 481                 len++;
 482                 p++;
 483         }
 484         if (!force_quotes && n == 0)
 485                 return arg;
 486
 487         /* insert \ where necessary */
 488         d = q = xmalloc(len+n+3);
 489         *d++ = '"';
 490         while (*arg) {
 491                 if (*arg == '"')
 492                         *d++ = '\\';
 493                 else if (*arg == '\\') {
 494                         int count = 0;
 495                         while (*arg == '\\') {
 496                                 count++;
 497                                 *d++ = *arg++;
 498                         }
 499                         if (*arg == '"') {
 500                                 while (count-- > 0)
 501                                         *d++ = '\\';
 502                                 *d++ = '\\';
 503                         }
 504                 }
 505                 *d++ = *arg++;
 506         }
 507         *d++ = '"';
 508         *d++ = 0;
 509         return q;
 510 }
 511
 512 static const char *parse_interpreter(const char *cmd)
 513 {
 514         static char buf[100];
 515         char *p, *opt;
 516         int n, fd;
 517
 518         /* don't even try a .exe */
 519         n = strlen(cmd);
 520         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 521                 return NULL;
 522
 523         fd = open(cmd, O_RDONLY);
 524         if (fd < 0)
 525                 return NULL;
 526         n = read(fd, buf, sizeof(buf)-1);
 527         close(fd);
 528         if (n < 4)      /* at least '#!/x' and not error */
 529                 return NULL;
 530
 531         if (buf[0] != '#' || buf[1] != '!')
 532                 return NULL;
 533         buf[n] = '\0';
 534         p = buf + strcspn(buf, "\r\n");
 535         if (!*p)
 536                 return NULL;
 537
 538         *p = '\0';
 539         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 540                 return NULL;
 541         /* strip options */
 542         if ((opt = strchr(p+1, ' ')))
 543                 *opt = '\0';
 544         return p+1;
 545 }
 546
 547 /*
 548  * Splits the PATH into parts.
 549  */
 550 static char **get_path_split(void)
 551 {
 552         char *p, **path, *envpath = getenv("PATH");
 553         int i, n = 0;
 554
 555         if (!envpath || !*envpath)
 556                 return NULL;
 557
 558         envpath = xstrdup(envpath);
 559         p = envpath;
 560         while (p) {
 561                 char *dir = p;
 562                 p = strchr(p, ';');
 563                 if (p) *p++ = '\0';
 564                 if (*dir) {     /* not earlier, catches series of ; */
 565                         ++n;
 566                 }
 567         }
 568         if (!n)
 569                 return NULL;
 570
 571         path = xmalloc((n+1)*sizeof(char *));
 572         p = envpath;
 573         i = 0;
 574         do {
 575                 if (*p)
 576                         path[i++] = xstrdup(p);
 577                 p = p+strlen(p)+1;
 578         } while (i < n);
 579         path[i] = NULL;
 580
 581         free(envpath);
 582
 583         return path;
 584 }
 585
 586 static void free_path_split(char **path)
 587 {
 588         char **p = path;
 589
 590         if (!path)
 591                 return;
 592
 593         while (*p)
 594                 free(*p++);
 595         free(path);
 596 }
 597
 598 /*
 599  * exe_only means that we only want to detect .exe files, but not scripts
 600  * (which do not have an extension)
 601  */
 602 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 603 {
 604         char path[MAX_PATH];
 605         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 606
 607         if (!isexe && access(path, F_OK) == 0)
 608                 return xstrdup(path);
 609         path[strlen(path)-4] = '\0';
 610         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 611                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 612                         return xstrdup(path);
 613         return NULL;
 614 }
 615
 616 /*
 617  * Determines the absolute path of cmd using the split path in path.
 618  * If cmd contains a slash or backslash, no lookup is performed.
 619  */
 620 static char *path_lookup(const char *cmd, char **path, int exe_only)
 621 {
 622         char *prog = NULL;
 623         int len = strlen(cmd);
 624         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 625
 626         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 627                 prog = xstrdup(cmd);
 628
 629         while (!prog && *path)
 630                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 631
 632         return prog;
 633 }
 634
 635 static int env_compare(const void *a, const void *b)
 636 {
 637         char *const *ea = a;
 638         char *const *eb = b;
 639         return strcasecmp(*ea, *eb);
 640 }
 641
 642 struct pinfo_t {
 643         struct pinfo_t *next;
 644         pid_t pid;
 645         HANDLE proc;
 646 } pinfo_t;
 647 struct pinfo_t *pinfo = NULL;
 648 CRITICAL_SECTION pinfo_cs;
 649
 650 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 651                               const char *dir,
 652                               int prepend_cmd, int fhin, int fhout, int fherr)
 653 {
 654         STARTUPINFO si;
 655         PROCESS_INFORMATION pi;
 656         struct strbuf envblk, args;
 657         unsigned flags;
 658         BOOL ret;
 659
 660         /* Determine whether or not we are associated to a console */
 661         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 662                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 663                         FILE_ATTRIBUTE_NORMAL, NULL);
 664         if (cons == INVALID_HANDLE_VALUE) {
 665                 /* There is no console associated with this process.
 666                  * Since the child is a console process, Windows
 667                  * would normally create a console window. But
 668                  * since we'll be redirecting std streams, we do
 669                  * not need the console.
 670                  * It is necessary to use DETACHED_PROCESS
 671                  * instead of CREATE_NO_WINDOW to make ssh
 672                  * recognize that it has no console.
 673                  */
 674                 flags = DETACHED_PROCESS;
 675         } else {
 676                 /* There is already a console. If we specified
 677                  * DETACHED_PROCESS here, too, Windows would
 678                  * disassociate the child from the console.
 679                  * The same is true for CREATE_NO_WINDOW.
 680                  * Go figure!
 681                  */
 682                 flags = 0;
 683                 CloseHandle(cons);
 684         }
 685         memset(&si, 0, sizeof(si));
 686         si.cb = sizeof(si);
 687         si.dwFlags = STARTF_USESTDHANDLES;
 688         si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 689         si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 690         si.hStdError = (HANDLE) _get_osfhandle(fherr);
 691
 692         /* concatenate argv, quoting args as we go */
 693         strbuf_init(&args, 0);
 694         if (prepend_cmd) {
 695                 char *quoted = (char *)quote_arg(cmd);
 696                 strbuf_addstr(&args, quoted);
 697                 if (quoted != cmd)
 698                         free(quoted);
 699         }
 700         for (; *argv; argv++) {
 701                 char *quoted = (char *)quote_arg(*argv);
 702                 if (*args.buf)
 703                         strbuf_addch(&args, ' ');
 704                 strbuf_addstr(&args, quoted);
 705                 if (quoted != *argv)
 706                         free(quoted);
 707         }
 708
 709         if (env) {
 710                 int count = 0;
 711                 char **e, **sorted_env;
 712
 713                 for (e = env; *e; e++)
 714                         count++;
 715
 716                 /* environment must be sorted */
 717                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 718                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 719                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 720
 721                 strbuf_init(&envblk, 0);
 722                 for (e = sorted_env; *e; e++) {
 723                         strbuf_addstr(&envblk, *e);
 724                         strbuf_addch(&envblk, '\0');
 725                 }
 726                 free(sorted_env);
 727         }
 728
 729         memset(&pi, 0, sizeof(pi));
 730         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 731                 env ? envblk.buf : NULL, dir, &si, &pi);
 732
 733         if (env)
 734                 strbuf_release(&envblk);
 735         strbuf_release(&args);
 736
 737         if (!ret) {
 738                 errno = ENOENT;
 739                 return -1;
 740         }
 741         CloseHandle(pi.hThread);
 742
 743         /*
 744          * The process ID is the human-readable identifier of the process
 745          * that we want to present in log and error messages. The handle
 746          * is not useful for this purpose. But we cannot close it, either,
 747          * because it is not possible to turn a process ID into a process
 748          * handle after the process terminated.
 749          * Keep the handle in a list for waitpid.
 750          */
 751         EnterCriticalSection(&pinfo_cs);
 752         {
 753                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
 754                 info->pid = pi.dwProcessId;
 755                 info->proc = pi.hProcess;
 756                 info->next = pinfo;
 757                 pinfo = info;
 758         }
 759         LeaveCriticalSection(&pinfo_cs);
 760
 761         return (pid_t)pi.dwProcessId;
 762 }
 763
 764 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 765                            int prepend_cmd)
 766 {
 767         return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 768 }
 769
 770 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 771                      const char *dir,
 772                      int fhin, int fhout, int fherr)
 773 {
 774         pid_t pid;
 775         char **path = get_path_split();
 776         char *prog = path_lookup(cmd, path, 0);
 777
 778         if (!prog) {
 779                 errno = ENOENT;
 780                 pid = -1;
 781         }
 782         else {
 783                 const char *interpr = parse_interpreter(prog);
 784
 785                 if (interpr) {
 786                         const char *argv0 = argv[0];
 787                         char *iprog = path_lookup(interpr, path, 1);
 788                         argv[0] = prog;
 789                         if (!iprog) {
 790                                 errno = ENOENT;
 791                                 pid = -1;
 792                         }
 793                         else {
 794                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 795                                                        fhin, fhout, fherr);
 796                                 free(iprog);
 797                         }
 798                         argv[0] = argv0;
 799                 }
 800                 else
 801                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
 802                                                fhin, fhout, fherr);
 803                 free(prog);
 804         }
 805         free_path_split(path);
 806         return pid;
 807 }
 808
 809 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 810 {
 811         const char *interpr = parse_interpreter(cmd);
 812         char **path;
 813         char *prog;
 814         int pid = 0;
 815
 816         if (!interpr)
 817                 return 0;
 818         path = get_path_split();
 819         prog = path_lookup(interpr, path, 1);
 820         if (prog) {
 821                 int argc = 0;
 822                 const char **argv2;
 823                 while (argv[argc]) argc++;
 824                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
 825                 argv2[0] = (char *)cmd; /* full path to the script file */
 826                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 827                 pid = mingw_spawnve(prog, argv2, env, 1);
 828                 if (pid >= 0) {
 829                         int status;
 830                         if (waitpid(pid, &status, 0) < 0)
 831                                 status = 255;
 832                         exit(status);
 833                 }
 834                 pid = 1;        /* indicate that we tried but failed */
 835                 free(prog);
 836                 free(argv2);
 837         }
 838         free_path_split(path);
 839         return pid;
 840 }
 841
 842 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 843 {
 844         /* check if git_command is a shell script */
 845         if (!try_shell_exec(cmd, argv, (char **)env)) {
 846                 int pid, status;
 847
 848                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 849                 if (pid < 0)
 850                         return;
 851                 if (waitpid(pid, &status, 0) < 0)
 852                         status = 255;
 853                 exit(status);
 854         }
 855 }
 856
 857 void mingw_execvp(const char *cmd, char *const *argv)
 858 {
 859         char **path = get_path_split();
 860         char *prog = path_lookup(cmd, path, 0);
 861
 862         if (prog) {
 863                 mingw_execve(prog, argv, environ);
 864                 free(prog);
 865         } else
 866                 errno = ENOENT;
 867
 868         free_path_split(path);
 869 }
 870
 871 void mingw_execv(const char *cmd, char *const *argv)
 872 {
 873         mingw_execve(cmd, argv, environ);
 874 }
 875
 876 int mingw_kill(pid_t pid, int sig)
 877 {
 878         if (pid > 0 && sig == SIGTERM) {
 879                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
 880
 881                 if (TerminateProcess(h, -1)) {
 882                         CloseHandle(h);
 883                         return 0;
 884                 }
 885
 886                 errno = err_win_to_posix(GetLastError());
 887                 CloseHandle(h);
 888                 return -1;
 889         }
 890
 891         errno = EINVAL;
 892         return -1;
 893 }
 894
 895 static char **copy_environ(void)
 896 {
 897         char **env;
 898         int i = 0;
 899         while (environ[i])
 900                 i++;
 901         env = xmalloc((i+1)*sizeof(*env));
 902         for (i = 0; environ[i]; i++)
 903                 env[i] = xstrdup(environ[i]);
 904         env[i] = NULL;
 905         return env;
 906 }
 907
 908 void free_environ(char **env)
 909 {
 910         int i;
 911         for (i = 0; env[i]; i++)
 912                 free(env[i]);
 913         free(env);
 914 }
 915
 916 static int lookup_env(char **env, const char *name, size_t nmln)
 917 {
 918         int i;
 919
 920         for (i = 0; env[i]; i++) {
 921                 if (0 == strncmp(env[i], name, nmln)
 922                     && '=' == env[i][nmln])
 923                         /* matches */
 924                         return i;
 925         }
 926         return -1;
 927 }
 928
 929 /*
 930  * If name contains '=', then sets the variable, otherwise it unsets it
 931  */
 932 static char **env_setenv(char **env, const char *name)
 933 {
 934         char *eq = strchrnul(name, '=');
 935         int i = lookup_env(env, name, eq-name);
 936
 937         if (i < 0) {
 938                 if (*eq) {
 939                         for (i = 0; env[i]; i++)
 940                                 ;
 941                         env = xrealloc(env, (i+2)*sizeof(*env));
 942                         env[i] = xstrdup(name);
 943                         env[i+1] = NULL;
 944                 }
 945         }
 946         else {
 947                 free(env[i]);
 948                 if (*eq)
 949                         env[i] = xstrdup(name);
 950                 else
 951                         for (; env[i]; i++)
 952                                 env[i] = env[i+1];
 953         }
 954         return env;
 955 }
 956
 957 /*
 958  * Copies global environ and adjusts variables as specified by vars.
 959  */
 960 char **make_augmented_environ(const char *const *vars)
 961 {
 962         char **env = copy_environ();
 963
 964         while (*vars)
 965                 env = env_setenv(env, *vars++);
 966         return env;
 967 }
 968
 969 /*
 970  * Note, this isn't a complete replacement for getaddrinfo. It assumes
 971  * that service contains a numerical port, or that it it is null. It
 972  * does a simple search using gethostbyname, and returns one IPv4 host
 973  * if one was found.
 974  */
 975 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
 976                                    const struct addrinfo *hints,
 977                                    struct addrinfo **res)
 978 {
 979         struct hostent *h = NULL;
 980         struct addrinfo *ai;
 981         struct sockaddr_in *sin;
 982
 983         if (node) {
 984                 h = gethostbyname(node);
 985                 if (!h)
 986                         return WSAGetLastError();
 987         }
 988
 989         ai = xmalloc(sizeof(struct addrinfo));
 990         *res = ai;
 991         ai->ai_flags = 0;
 992         ai->ai_family = AF_INET;
 993         ai->ai_socktype = hints ? hints->ai_socktype : 0;
 994         switch (ai->ai_socktype) {
 995         case SOCK_STREAM:
 996                 ai->ai_protocol = IPPROTO_TCP;
 997                 break;
 998         case SOCK_DGRAM:
 999                 ai->ai_protocol = IPPROTO_UDP;
1000                 break;
1001         default:
1002                 ai->ai_protocol = 0;
1003                 break;
1004         }
1005         ai->ai_addrlen = sizeof(struct sockaddr_in);
1006         if (hints && (hints->ai_flags & AI_CANONNAME))
1007                 ai->ai_canonname = h ? strdup(h->h_name) : NULL;
1008         else
1009                 ai->ai_canonname = NULL;
1010
1011         sin = xmalloc(ai->ai_addrlen);
1012         memset(sin, 0, ai->ai_addrlen);
1013         sin->sin_family = AF_INET;
1014         /* Note: getaddrinfo is supposed to allow service to be a string,
1015          * which should be looked up using getservbyname. This is
1016          * currently not implemented */
1017         if (service)
1018                 sin->sin_port = htons(atoi(service));
1019         if (h)
1020                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1021         else if (hints && (hints->ai_flags & AI_PASSIVE))
1022                 sin->sin_addr.s_addr = INADDR_ANY;
1023         else
1024                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1025         ai->ai_addr = (struct sockaddr *)sin;
1026         ai->ai_next = 0;
1027         return 0;
1028 }
1029
1030 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1031 {
1032         free(res->ai_canonname);
1033         free(res->ai_addr);
1034         free(res);
1035 }
1036
1037 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1038                                    char *host, DWORD hostlen,
1039                                    char *serv, DWORD servlen, int flags)
1040 {
1041         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1042         if (sa->sa_family != AF_INET)
1043                 return EAI_FAMILY;
1044         if (!host && !serv)
1045                 return EAI_NONAME;
1046
1047         if (host && hostlen > 0) {
1048                 struct hostent *ent = NULL;
1049                 if (!(flags & NI_NUMERICHOST))
1050                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1051                                             sizeof(sin->sin_addr), AF_INET);
1052
1053                 if (ent)
1054                         snprintf(host, hostlen, "%s", ent->h_name);
1055                 else if (flags & NI_NAMEREQD)
1056                         return EAI_NONAME;
1057                 else
1058                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1059         }
1060
1061         if (serv && servlen > 0) {
1062                 struct servent *ent = NULL;
1063                 if (!(flags & NI_NUMERICSERV))
1064                         ent = getservbyport(sin->sin_port,
1065                                             flags & NI_DGRAM ? "udp" : "tcp");
1066
1067                 if (ent)
1068                         snprintf(serv, servlen, "%s", ent->s_name);
1069                 else
1070                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1071         }
1072
1073         return 0;
1074 }
1075
1076 static HMODULE ipv6_dll = NULL;
1077 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1078 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1079                                       const struct addrinfo *hints,
1080                                       struct addrinfo **res);
1081 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1082                                       char *host, DWORD hostlen,
1083                                       char *serv, DWORD servlen, int flags);
1084 /*
1085  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1086  * don't need to try to load that one dynamically.
1087  */
1088
1089 static void socket_cleanup(void)
1090 {
1091         WSACleanup();
1092         if (ipv6_dll)
1093                 FreeLibrary(ipv6_dll);
1094         ipv6_dll = NULL;
1095         ipv6_freeaddrinfo = freeaddrinfo_stub;
1096         ipv6_getaddrinfo = getaddrinfo_stub;
1097         ipv6_getnameinfo = getnameinfo_stub;
1098 }
1099
1100 static void ensure_socket_initialization(void)
1101 {
1102         WSADATA wsa;
1103         static int initialized = 0;
1104         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1105         const char **name;
1106
1107         if (initialized)
1108                 return;
1109
1110         if (WSAStartup(MAKEWORD(2,2), &wsa))
1111                 die("unable to initialize winsock subsystem, error %d",
1112                         WSAGetLastError());
1113
1114         for (name = libraries; *name; name++) {
1115                 ipv6_dll = LoadLibrary(*name);
1116                 if (!ipv6_dll)
1117                         continue;
1118
1119                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1120                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1121                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1122                                                    const struct addrinfo *,
1123                                                    struct addrinfo **))
1124                         GetProcAddress(ipv6_dll, "getaddrinfo");
1125                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1126                                                    socklen_t, char *, DWORD,
1127                                                    char *, DWORD, int))
1128                         GetProcAddress(ipv6_dll, "getnameinfo");
1129                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1130                         FreeLibrary(ipv6_dll);
1131                         ipv6_dll = NULL;
1132                 } else
1133                         break;
1134         }
1135         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1136                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1137                 ipv6_getaddrinfo = getaddrinfo_stub;
1138                 ipv6_getnameinfo = getnameinfo_stub;
1139         }
1140
1141         atexit(socket_cleanup);
1142         initialized = 1;
1143 }
1144
1145 #undef gethostbyname
1146 struct hostent *mingw_gethostbyname(const char *host)
1147 {
1148         ensure_socket_initialization();
1149         return gethostbyname(host);
1150 }
1151
1152 void mingw_freeaddrinfo(struct addrinfo *res)
1153 {
1154         ipv6_freeaddrinfo(res);
1155 }
1156
1157 int mingw_getaddrinfo(const char *node, const char *service,
1158                       const struct addrinfo *hints, struct addrinfo **res)
1159 {
1160         ensure_socket_initialization();
1161         return ipv6_getaddrinfo(node, service, hints, res);
1162 }
1163
1164 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1165                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1166                       int flags)
1167 {
1168         ensure_socket_initialization();
1169         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1170 }
1171
1172 int mingw_socket(int domain, int type, int protocol)
1173 {
1174         int sockfd;
1175         SOCKET s;
1176
1177         ensure_socket_initialization();
1178         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1179         if (s == INVALID_SOCKET) {
1180                 /*
1181                  * WSAGetLastError() values are regular BSD error codes
1182                  * biased by WSABASEERR.
1183                  * However, strerror() does not know about networking
1184                  * specific errors, which are values beginning at 38 or so.
1185                  * Therefore, we choose to leave the biased error code
1186                  * in errno so that _if_ someone looks up the code somewhere,
1187                  * then it is at least the number that are usually listed.
1188                  */
1189                 errno = WSAGetLastError();
1190                 return -1;
1191         }
1192         /* convert into a file descriptor */
1193         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1194                 closesocket(s);
1195                 return error("unable to make a socket file descriptor: %s",
1196                         strerror(errno));
1197         }
1198         return sockfd;
1199 }
1200
1201 #undef connect
1202 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1203 {
1204         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1205         return connect(s, sa, sz);
1206 }
1207
1208 #undef bind
1209 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1210 {
1211         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1212         return bind(s, sa, sz);
1213 }
1214
1215 #undef setsockopt
1216 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1217 {
1218         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1219         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1220 }
1221
1222 #undef listen
1223 int mingw_listen(int sockfd, int backlog)
1224 {
1225         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1226         return listen(s, backlog);
1227 }
1228
1229 #undef accept
1230 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1231 {
1232         int sockfd2;
1233
1234         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1235         SOCKET s2 = accept(s1, sa, sz);
1236
1237         /* convert into a file descriptor */
1238         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1239                 int err = errno;
1240                 closesocket(s2);
1241                 return error("unable to make a socket file descriptor: %s",
1242                         strerror(err));
1243         }
1244         return sockfd2;
1245 }
1246
1247 #undef rename
1248 int mingw_rename(const char *pold, const char *pnew)
1249 {
1250         DWORD attrs, gle;
1251         int tries = 0;
1252         static const int delay[] = { 0, 1, 10, 20, 40 };
1253
1254         /*
1255          * Try native rename() first to get errno right.
1256          * It is based on MoveFile(), which cannot overwrite existing files.
1257          */
1258         if (!rename(pold, pnew))
1259                 return 0;
1260         if (errno != EEXIST)
1261                 return -1;
1262 repeat:
1263         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1264                 return 0;
1265         /* TODO: translate more errors */
1266         gle = GetLastError();
1267         if (gle == ERROR_ACCESS_DENIED &&
1268             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1269                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1270                         errno = EISDIR;
1271                         return -1;
1272                 }
1273                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1274                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1275                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1276                                 return 0;
1277                         gle = GetLastError();
1278                         /* revert file attributes on failure */
1279                         SetFileAttributes(pnew, attrs);
1280                 }
1281         }
1282         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1283                 /*
1284                  * We assume that some other process had the source or
1285                  * destination file open at the wrong moment and retry.
1286                  * In order to give the other process a higher chance to
1287                  * complete its operation, we give up our time slice now.
1288                  * If we have to retry again, we do sleep a bit.
1289                  */
1290                 Sleep(delay[tries]);
1291                 tries++;
1292                 goto repeat;
1293         }
1294         errno = EACCES;
1295         return -1;
1296 }
1297
1298 /*
1299  * Note that this doesn't return the actual pagesize, but
1300  * the allocation granularity. If future Windows specific git code
1301  * needs the real getpagesize function, we need to find another solution.
1302  */
1303 int mingw_getpagesize(void)
1304 {
1305         SYSTEM_INFO si;
1306         GetSystemInfo(&si);
1307         return si.dwAllocationGranularity;
1308 }
1309
1310 struct passwd *getpwuid(int uid)
1311 {
1312         static char user_name[100];
1313         static struct passwd p;
1314
1315         DWORD len = sizeof(user_name);
1316         if (!GetUserName(user_name, &len))
1317                 return NULL;
1318         p.pw_name = user_name;
1319         p.pw_gecos = "unknown";
1320         p.pw_dir = NULL;
1321         return &p;
1322 }
1323
1324 static HANDLE timer_event;
1325 static HANDLE timer_thread;
1326 static int timer_interval;
1327 static int one_shot;
1328 static sig_handler_t timer_fn = SIG_DFL;
1329
1330 /* The timer works like this:
1331  * The thread, ticktack(), is a trivial routine that most of the time
1332  * only waits to receive the signal to terminate. The main thread tells
1333  * the thread to terminate by setting the timer_event to the signalled
1334  * state.
1335  * But ticktack() interrupts the wait state after the timer's interval
1336  * length to call the signal handler.
1337  */
1338
1339 static unsigned __stdcall ticktack(void *dummy)
1340 {
1341         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1342                 if (timer_fn == SIG_DFL)
1343                         die("Alarm");
1344                 if (timer_fn != SIG_IGN)
1345                         timer_fn(SIGALRM);
1346                 if (one_shot)
1347                         break;
1348         }
1349         return 0;
1350 }
1351
1352 static int start_timer_thread(void)
1353 {
1354         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1355         if (timer_event) {
1356                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1357                 if (!timer_thread )
1358                         return errno = ENOMEM,
1359                                 error("cannot start timer thread");
1360         } else
1361                 return errno = ENOMEM,
1362                         error("cannot allocate resources for timer");
1363         return 0;
1364 }
1365
1366 static void stop_timer_thread(void)
1367 {
1368         if (timer_event)
1369                 SetEvent(timer_event);  /* tell thread to terminate */
1370         if (timer_thread) {
1371                 int rc = WaitForSingleObject(timer_thread, 1000);
1372                 if (rc == WAIT_TIMEOUT)
1373                         error("timer thread did not terminate timely");
1374                 else if (rc != WAIT_OBJECT_0)
1375                         error("waiting for timer thread failed: %lu",
1376                               GetLastError());
1377                 CloseHandle(timer_thread);
1378         }
1379         if (timer_event)
1380                 CloseHandle(timer_event);
1381         timer_event = NULL;
1382         timer_thread = NULL;
1383 }
1384
1385 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1386 {
1387         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1388 }
1389
1390 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1391 {
1392         static const struct timeval zero;
1393         static int atexit_done;
1394
1395         if (out != NULL)
1396                 return errno = EINVAL,
1397                         error("setitimer param 3 != NULL not implemented");
1398         if (!is_timeval_eq(&in->it_interval, &zero) &&
1399             !is_timeval_eq(&in->it_interval, &in->it_value))
1400                 return errno = EINVAL,
1401                         error("setitimer: it_interval must be zero or eq it_value");
1402
1403         if (timer_thread)
1404                 stop_timer_thread();
1405
1406         if (is_timeval_eq(&in->it_value, &zero) &&
1407             is_timeval_eq(&in->it_interval, &zero))
1408                 return 0;
1409
1410         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1411         one_shot = is_timeval_eq(&in->it_interval, &zero);
1412         if (!atexit_done) {
1413                 atexit(stop_timer_thread);
1414                 atexit_done = 1;
1415         }
1416         return start_timer_thread();
1417 }
1418
1419 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1420 {
1421         if (sig != SIGALRM)
1422                 return errno = EINVAL,
1423                         error("sigaction only implemented for SIGALRM");
1424         if (out != NULL)
1425                 return errno = EINVAL,
1426                         error("sigaction: param 3 != NULL not implemented");
1427
1428         timer_fn = in->sa_handler;
1429         return 0;
1430 }
1431
1432 #undef signal
1433 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1434 {
1435         sig_handler_t old = timer_fn;
1436         if (sig != SIGALRM)
1437                 return signal(sig, handler);
1438         timer_fn = handler;
1439         return old;
1440 }
1441
1442 static const char *make_backslash_path(const char *path)
1443 {
1444         static char buf[PATH_MAX + 1];
1445         char *c;
1446
1447         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1448                 die("Too long path: %.*s", 60, path);
1449
1450         for (c = buf; *c; c++) {
1451                 if (*c == '/')
1452                         *c = '\\';
1453         }
1454         return buf;
1455 }
1456
1457 void mingw_open_html(const char *unixpath)
1458 {
1459         const char *htmlpath = make_backslash_path(unixpath);
1460         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1461                         const char *, const char *, const char *, INT);
1462         T ShellExecute;
1463         HMODULE shell32;
1464         int r;
1465
1466         shell32 = LoadLibrary("shell32.dll");
1467         if (!shell32)
1468                 die("cannot load shell32.dll");
1469         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1470         if (!ShellExecute)
1471                 die("cannot run browser");
1472
1473         printf("Launching default browser to display HTML ...\n");
1474         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1475         FreeLibrary(shell32);
1476         /* see the MSDN documentation referring to the result codes here */
1477         if (r <= 32) {
1478                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1479         }
1480 }
1481
1482 int link(const char *oldpath, const char *newpath)
1483 {
1484         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1485         static T create_hard_link = NULL;
1486         if (!create_hard_link) {
1487                 create_hard_link = (T) GetProcAddress(
1488                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1489                 if (!create_hard_link)
1490                         create_hard_link = (T)-1;
1491         }
1492         if (create_hard_link == (T)-1) {
1493                 errno = ENOSYS;
1494                 return -1;
1495         }
1496         if (!create_hard_link(newpath, oldpath, NULL)) {
1497                 errno = err_win_to_posix(GetLastError());
1498                 return -1;
1499         }
1500         return 0;
1501 }
1502
1503 char *getpass(const char *prompt)
1504 {
1505         struct strbuf buf = STRBUF_INIT;
1506
1507         fputs(prompt, stderr);
1508         for (;;) {
1509                 char c = _getch();
1510                 if (c == '\r' || c == '\n')
1511                         break;
1512                 strbuf_addch(&buf, c);
1513         }
1514         fputs("\n", stderr);
1515         return strbuf_detach(&buf, NULL);
1516 }
1517
1518 pid_t waitpid(pid_t pid, int *status, unsigned options)
1519 {
1520         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1521             FALSE, pid);
1522         if (!h) {
1523                 errno = ECHILD;
1524                 return -1;
1525         }
1526
1527         if (pid > 0 && options & WNOHANG) {
1528                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1529                         CloseHandle(h);
1530                         return 0;
1531                 }
1532                 options &= ~WNOHANG;
1533         }
1534
1535         if (options == 0) {
1536                 struct pinfo_t **ppinfo;
1537                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1538                         CloseHandle(h);
1539                         return 0;
1540                 }
1541
1542                 if (status)
1543                         GetExitCodeProcess(h, (LPDWORD)status);
1544
1545                 EnterCriticalSection(&pinfo_cs);
1546
1547                 ppinfo = &pinfo;
1548                 while (*ppinfo) {
1549                         struct pinfo_t *info = *ppinfo;
1550                         if (info->pid == pid) {
1551                                 CloseHandle(info->proc);
1552                                 *ppinfo = info->next;
1553                                 free(info);
1554                                 break;
1555                         }
1556                         ppinfo = &info->next;
1557                 }
1558
1559                 LeaveCriticalSection(&pinfo_cs);
1560
1561                 CloseHandle(h);
1562                 return pid;
1563         }
1564         CloseHandle(h);
1565
1566         errno = EINVAL;
1567         return -1;
1568 }