compat/mingw.c

   1 #include "../git-compat-util.h"
   2 #include "win32.h"
   3 #include <conio.h>
   4 #include "../strbuf.h"
   5
   6 int err_win_to_posix(DWORD winerr)
   7 {
   8         int error = ENOSYS;
   9         switch(winerr) {
  10         case ERROR_ACCESS_DENIED: error = EACCES; break;
  11         case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  12         case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  13         case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  14         case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  15         case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  16         case ERROR_BAD_COMMAND: error = EIO; break;
  17         case ERROR_BAD_DEVICE: error = ENODEV; break;
  18         case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  19         case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  20         case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  21         case ERROR_BAD_LENGTH: error = EINVAL; break;
  22         case ERROR_BAD_PATHNAME: error = ENOENT; break;
  23         case ERROR_BAD_PIPE: error = EPIPE; break;
  24         case ERROR_BAD_UNIT: error = ENODEV; break;
  25         case ERROR_BAD_USERNAME: error = EINVAL; break;
  26         case ERROR_BROKEN_PIPE: error = EPIPE; break;
  27         case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  28         case ERROR_BUSY: error = EBUSY; break;
  29         case ERROR_BUSY_DRIVE: error = EBUSY; break;
  30         case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  31         case ERROR_CANNOT_MAKE: error = EACCES; break;
  32         case ERROR_CANTOPEN: error = EIO; break;
  33         case ERROR_CANTREAD: error = EIO; break;
  34         case ERROR_CANTWRITE: error = EIO; break;
  35         case ERROR_CRC: error = EIO; break;
  36         case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  37         case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  38         case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  39         case ERROR_DIRECTORY: error = EINVAL; break;
  40         case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  41         case ERROR_DISK_CHANGE: error = EIO; break;
  42         case ERROR_DISK_FULL: error = ENOSPC; break;
  43         case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  44         case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  45         case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  46         case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  47         case ERROR_FILE_EXISTS: error = EEXIST; break;
  48         case ERROR_FILE_INVALID: error = ENODEV; break;
  49         case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  50         case ERROR_GEN_FAILURE: error = EIO; break;
  51         case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  52         case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  53         case ERROR_INVALID_ACCESS: error = EACCES; break;
  54         case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  55         case ERROR_INVALID_BLOCK: error = EFAULT; break;
  56         case ERROR_INVALID_DATA: error = EINVAL; break;
  57         case ERROR_INVALID_DRIVE: error = ENODEV; break;
  58         case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  59         case ERROR_INVALID_FLAGS: error = EINVAL; break;
  60         case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  61         case ERROR_INVALID_HANDLE: error = EBADF; break;
  62         case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  63         case ERROR_INVALID_NAME: error = EINVAL; break;
  64         case ERROR_INVALID_OWNER: error = EINVAL; break;
  65         case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  66         case ERROR_INVALID_PASSWORD: error = EPERM; break;
  67         case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  68         case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  69         case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  70         case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  71         case ERROR_IO_DEVICE: error = EIO; break;
  72         case ERROR_IO_INCOMPLETE: error = EINTR; break;
  73         case ERROR_LOCKED: error = EBUSY; break;
  74         case ERROR_LOCK_VIOLATION: error = EACCES; break;
  75         case ERROR_LOGON_FAILURE: error = EACCES; break;
  76         case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  77         case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  78         case ERROR_MORE_DATA: error = EPIPE; break;
  79         case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  80         case ERROR_NOACCESS: error = EFAULT; break;
  81         case ERROR_NONE_MAPPED: error = EINVAL; break;
  82         case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  83         case ERROR_NOT_READY: error = EAGAIN; break;
  84         case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  85         case ERROR_NO_DATA: error = EPIPE; break;
  86         case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  87         case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  88         case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  89         case ERROR_OPEN_FAILED: error = EIO; break;
  90         case ERROR_OPEN_FILES: error = EBUSY; break;
  91         case ERROR_OPERATION_ABORTED: error = EINTR; break;
  92         case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  93         case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
  94         case ERROR_PATH_BUSY: error = EBUSY; break;
  95         case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
  96         case ERROR_PIPE_BUSY: error = EBUSY; break;
  97         case ERROR_PIPE_CONNECTED: error = EPIPE; break;
  98         case ERROR_PIPE_LISTENING: error = EPIPE; break;
  99         case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 100         case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 101         case ERROR_READ_FAULT: error = EIO; break;
 102         case ERROR_SEEK: error = EIO; break;
 103         case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 104         case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 105         case ERROR_SHARING_VIOLATION: error = EACCES; break;
 106         case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 107         case ERROR_SWAPERROR: error = ENOENT; break;
 108         case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 109         case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 110         case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 111         case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 112         case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 113         case ERROR_WRITE_FAULT: error = EIO; break;
 114         case ERROR_WRITE_PROTECT: error = EROFS; break;
 115         }
 116         return error;
 117 }
 118
 119 #undef open
 120 int mingw_open (const char *filename, int oflags, ...)
 121 {
 122         va_list args;
 123         unsigned mode;
 124         int fd;
 125
 126         va_start(args, oflags);
 127         mode = va_arg(args, int);
 128         va_end(args);
 129
 130         if (!strcmp(filename, "/dev/null"))
 131                 filename = "nul";
 132
 133         fd = open(filename, oflags, mode);
 134
 135         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 136                 DWORD attrs = GetFileAttributes(filename);
 137                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 138                         errno = EISDIR;
 139         }
 140         return fd;
 141 }
 142
 143 #undef write
 144 ssize_t mingw_write(int fd, const void *buf, size_t count)
 145 {
 146         /*
 147          * While write() calls to a file on a local disk are translated
 148          * into WriteFile() calls with a maximum size of 64KB on Windows
 149          * XP and 256KB on Vista, no such cap is placed on writes to
 150          * files over the network on Windows XP.  Unfortunately, there
 151          * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 152          * bigger writes fail on Windows XP.
 153          * So we cap to a nice 31MB here to avoid write failures over
 154          * the net without changing the number of WriteFile() calls in
 155          * the local case.
 156          */
 157         return write(fd, buf, min(count, 31 * 1024 * 1024));
 158 }
 159
 160 #undef fopen
 161 FILE *mingw_fopen (const char *filename, const char *otype)
 162 {
 163         if (!strcmp(filename, "/dev/null"))
 164                 filename = "nul";
 165         return fopen(filename, otype);
 166 }
 167
 168 #undef freopen
 169 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 170 {
 171         if (filename && !strcmp(filename, "/dev/null"))
 172                 filename = "nul";
 173         return freopen(filename, otype, stream);
 174 }
 175
 176 /*
 177  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 178  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 179  */
 180 static inline long long filetime_to_hnsec(const FILETIME *ft)
 181 {
 182         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 183         /* Windows to Unix Epoch conversion */
 184         return winTime - 116444736000000000LL;
 185 }
 186
 187 static inline time_t filetime_to_time_t(const FILETIME *ft)
 188 {
 189         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 190 }
 191
 192 /* We keep the do_lstat code in a separate function to avoid recursion.
 193  * When a path ends with a slash, the stat will fail with ENOENT. In
 194  * this case, we strip the trailing slashes and stat again.
 195  */
 196 static int do_lstat(const char *file_name, struct stat *buf)
 197 {
 198         int err;
 199         WIN32_FILE_ATTRIBUTE_DATA fdata;
 200
 201         if (!(err = get_file_attr(file_name, &fdata))) {
 202                 buf->st_ino = 0;
 203                 buf->st_gid = 0;
 204                 buf->st_uid = 0;
 205                 buf->st_nlink = 1;
 206                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 207                 buf->st_size = fdata.nFileSizeLow |
 208                         (((off_t)fdata.nFileSizeHigh)<<32);
 209                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 210                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 211                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 212                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 213                 return 0;
 214         }
 215         errno = err;
 216         return -1;
 217 }
 218
 219 /* We provide our own lstat/fstat functions, since the provided
 220  * lstat/fstat functions are so slow. These stat functions are
 221  * tailored for Git's usage (read: fast), and are not meant to be
 222  * complete. Note that Git stat()s are redirected to mingw_lstat()
 223  * too, since Windows doesn't really handle symlinks that well.
 224  */
 225 int mingw_lstat(const char *file_name, struct stat *buf)
 226 {
 227         int namelen;
 228         static char alt_name[PATH_MAX];
 229
 230         if (!do_lstat(file_name, buf))
 231                 return 0;
 232
 233         /* if file_name ended in a '/', Windows returned ENOENT;
 234          * try again without trailing slashes
 235          */
 236         if (errno != ENOENT)
 237                 return -1;
 238
 239         namelen = strlen(file_name);
 240         if (namelen && file_name[namelen-1] != '/')
 241                 return -1;
 242         while (namelen && file_name[namelen-1] == '/')
 243                 --namelen;
 244         if (!namelen || namelen >= PATH_MAX)
 245                 return -1;
 246
 247         memcpy(alt_name, file_name, namelen);
 248         alt_name[namelen] = 0;
 249         return do_lstat(alt_name, buf);
 250 }
 251
 252 #undef fstat
 253 int mingw_fstat(int fd, struct stat *buf)
 254 {
 255         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 256         BY_HANDLE_FILE_INFORMATION fdata;
 257
 258         if (fh == INVALID_HANDLE_VALUE) {
 259                 errno = EBADF;
 260                 return -1;
 261         }
 262         /* direct non-file handles to MS's fstat() */
 263         if (GetFileType(fh) != FILE_TYPE_DISK)
 264                 return _fstati64(fd, buf);
 265
 266         if (GetFileInformationByHandle(fh, &fdata)) {
 267                 buf->st_ino = 0;
 268                 buf->st_gid = 0;
 269                 buf->st_uid = 0;
 270                 buf->st_nlink = 1;
 271                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 272                 buf->st_size = fdata.nFileSizeLow |
 273                         (((off_t)fdata.nFileSizeHigh)<<32);
 274                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 275                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 276                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 277                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 278                 return 0;
 279         }
 280         errno = EBADF;
 281         return -1;
 282 }
 283
 284 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 285 {
 286         long long winTime = t * 10000000LL + 116444736000000000LL;
 287         ft->dwLowDateTime = winTime;
 288         ft->dwHighDateTime = winTime >> 32;
 289 }
 290
 291 int mingw_utime (const char *file_name, const struct utimbuf *times)
 292 {
 293         FILETIME mft, aft;
 294         int fh, rc;
 295
 296         /* must have write permission */
 297         DWORD attrs = GetFileAttributes(file_name);
 298         if (attrs != INVALID_FILE_ATTRIBUTES &&
 299             (attrs & FILE_ATTRIBUTE_READONLY)) {
 300                 /* ignore errors here; open() will report them */
 301                 SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 302         }
 303
 304         if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 305                 rc = -1;
 306                 goto revert_attrs;
 307         }
 308
 309         if (times) {
 310                 time_t_to_filetime(times->modtime, &mft);
 311                 time_t_to_filetime(times->actime, &aft);
 312         } else {
 313                 GetSystemTimeAsFileTime(&mft);
 314                 aft = mft;
 315         }
 316         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 317                 errno = EINVAL;
 318                 rc = -1;
 319         } else
 320                 rc = 0;
 321         close(fh);
 322
 323 revert_attrs:
 324         if (attrs != INVALID_FILE_ATTRIBUTES &&
 325             (attrs & FILE_ATTRIBUTE_READONLY)) {
 326                 /* ignore errors again */
 327                 SetFileAttributes(file_name, attrs);
 328         }
 329         return rc;
 330 }
 331
 332 unsigned int sleep (unsigned int seconds)
 333 {
 334         Sleep(seconds*1000);
 335         return 0;
 336 }
 337
 338 int mkstemp(char *template)
 339 {
 340         char *filename = mktemp(template);
 341         if (filename == NULL)
 342                 return -1;
 343         return open(filename, O_RDWR | O_CREAT, 0600);
 344 }
 345
 346 int gettimeofday(struct timeval *tv, void *tz)
 347 {
 348         FILETIME ft;
 349         long long hnsec;
 350
 351         GetSystemTimeAsFileTime(&ft);
 352         hnsec = filetime_to_hnsec(&ft);
 353         tv->tv_sec = hnsec / 10000000;
 354         tv->tv_usec = (hnsec % 10000000) / 10;
 355         return 0;
 356 }
 357
 358 int pipe(int filedes[2])
 359 {
 360         HANDLE h[2];
 361
 362         /* this creates non-inheritable handles */
 363         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 364                 errno = err_win_to_posix(GetLastError());
 365                 return -1;
 366         }
 367         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 368         if (filedes[0] < 0) {
 369                 CloseHandle(h[0]);
 370                 CloseHandle(h[1]);
 371                 return -1;
 372         }
 373         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 374         if (filedes[0] < 0) {
 375                 close(filedes[0]);
 376                 CloseHandle(h[1]);
 377                 return -1;
 378         }
 379         return 0;
 380 }
 381
 382 int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 383 {
 384         int i, pending;
 385
 386         if (timeout >= 0) {
 387                 if (nfds == 0) {
 388                         Sleep(timeout);
 389                         return 0;
 390                 }
 391                 return errno = EINVAL, error("poll timeout not supported");
 392         }
 393
 394         /* When there is only one fd to wait for, then we pretend that
 395          * input is available and let the actual wait happen when the
 396          * caller invokes read().
 397          */
 398         if (nfds == 1) {
 399                 if (!(ufds[0].events & POLLIN))
 400                         return errno = EINVAL, error("POLLIN not set");
 401                 ufds[0].revents = POLLIN;
 402                 return 0;
 403         }
 404
 405 repeat:
 406         pending = 0;
 407         for (i = 0; i < nfds; i++) {
 408                 DWORD avail = 0;
 409                 HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 410                 if (h == INVALID_HANDLE_VALUE)
 411                         return -1;      /* errno was set */
 412
 413                 if (!(ufds[i].events & POLLIN))
 414                         return errno = EINVAL, error("POLLIN not set");
 415
 416                 /* this emulation works only for pipes */
 417                 if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 418                         int err = GetLastError();
 419                         if (err == ERROR_BROKEN_PIPE) {
 420                                 ufds[i].revents = POLLHUP;
 421                                 pending++;
 422                         } else {
 423                                 errno = EINVAL;
 424                                 return error("PeekNamedPipe failed,"
 425                                         " GetLastError: %u", err);
 426                         }
 427                 } else if (avail) {
 428                         ufds[i].revents = POLLIN;
 429                         pending++;
 430                 } else
 431                         ufds[i].revents = 0;
 432         }
 433         if (!pending) {
 434                 /* The only times that we spin here is when the process
 435                  * that is connected through the pipes is waiting for
 436                  * its own input data to become available. But since
 437                  * the process (pack-objects) is itself CPU intensive,
 438                  * it will happily pick up the time slice that we are
 439                  * relinquishing here.
 440                  */
 441                 Sleep(0);
 442                 goto repeat;
 443         }
 444         return 0;
 445 }
 446
 447 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 448 {
 449         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 450         memcpy(result, gmtime(timep), sizeof(struct tm));
 451         return result;
 452 }
 453
 454 struct tm *localtime_r(const time_t *timep, struct tm *result)
 455 {
 456         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 457         memcpy(result, localtime(timep), sizeof(struct tm));
 458         return result;
 459 }
 460
 461 #undef getcwd
 462 char *mingw_getcwd(char *pointer, int len)
 463 {
 464         int i;
 465         char *ret = getcwd(pointer, len);
 466         if (!ret)
 467                 return ret;
 468         for (i = 0; pointer[i]; i++)
 469                 if (pointer[i] == '\\')
 470                         pointer[i] = '/';
 471         return ret;
 472 }
 473
 474 #undef getenv
 475 char *mingw_getenv(const char *name)
 476 {
 477         char *result = getenv(name);
 478         if (!result && !strcmp(name, "TMPDIR")) {
 479                 /* on Windows it is TMP and TEMP */
 480                 result = getenv("TMP");
 481                 if (!result)
 482                         result = getenv("TEMP");
 483         }
 484         return result;
 485 }
 486
 487 /*
 488  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 489  * (Parsing C++ Command-Line Arguments)
 490  */
 491 static const char *quote_arg(const char *arg)
 492 {
 493         /* count chars to quote */
 494         int len = 0, n = 0;
 495         int force_quotes = 0;
 496         char *q, *d;
 497         const char *p = arg;
 498         if (!*p) force_quotes = 1;
 499         while (*p) {
 500                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 501                         force_quotes = 1;
 502                 else if (*p == '"')
 503                         n++;
 504                 else if (*p == '\\') {
 505                         int count = 0;
 506                         while (*p == '\\') {
 507                                 count++;
 508                                 p++;
 509                                 len++;
 510                         }
 511                         if (*p == '"')
 512                                 n += count*2 + 1;
 513                         continue;
 514                 }
 515                 len++;
 516                 p++;
 517         }
 518         if (!force_quotes && n == 0)
 519                 return arg;
 520
 521         /* insert \ where necessary */
 522         d = q = xmalloc(len+n+3);
 523         *d++ = '"';
 524         while (*arg) {
 525                 if (*arg == '"')
 526                         *d++ = '\\';
 527                 else if (*arg == '\\') {
 528                         int count = 0;
 529                         while (*arg == '\\') {
 530                                 count++;
 531                                 *d++ = *arg++;
 532                         }
 533                         if (*arg == '"') {
 534                                 while (count-- > 0)
 535                                         *d++ = '\\';
 536                                 *d++ = '\\';
 537                         }
 538                 }
 539                 *d++ = *arg++;
 540         }
 541         *d++ = '"';
 542         *d++ = 0;
 543         return q;
 544 }
 545
 546 static const char *parse_interpreter(const char *cmd)
 547 {
 548         static char buf[100];
 549         char *p, *opt;
 550         int n, fd;
 551
 552         /* don't even try a .exe */
 553         n = strlen(cmd);
 554         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 555                 return NULL;
 556
 557         fd = open(cmd, O_RDONLY);
 558         if (fd < 0)
 559                 return NULL;
 560         n = read(fd, buf, sizeof(buf)-1);
 561         close(fd);
 562         if (n < 4)      /* at least '#!/x' and not error */
 563                 return NULL;
 564
 565         if (buf[0] != '#' || buf[1] != '!')
 566                 return NULL;
 567         buf[n] = '\0';
 568         p = buf + strcspn(buf, "\r\n");
 569         if (!*p)
 570                 return NULL;
 571
 572         *p = '\0';
 573         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 574                 return NULL;
 575         /* strip options */
 576         if ((opt = strchr(p+1, ' ')))
 577                 *opt = '\0';
 578         return p+1;
 579 }
 580
 581 /*
 582  * Splits the PATH into parts.
 583  */
 584 static char **get_path_split(void)
 585 {
 586         char *p, **path, *envpath = getenv("PATH");
 587         int i, n = 0;
 588
 589         if (!envpath || !*envpath)
 590                 return NULL;
 591
 592         envpath = xstrdup(envpath);
 593         p = envpath;
 594         while (p) {
 595                 char *dir = p;
 596                 p = strchr(p, ';');
 597                 if (p) *p++ = '\0';
 598                 if (*dir) {     /* not earlier, catches series of ; */
 599                         ++n;
 600                 }
 601         }
 602         if (!n)
 603                 return NULL;
 604
 605         path = xmalloc((n+1)*sizeof(char *));
 606         p = envpath;
 607         i = 0;
 608         do {
 609                 if (*p)
 610                         path[i++] = xstrdup(p);
 611                 p = p+strlen(p)+1;
 612         } while (i < n);
 613         path[i] = NULL;
 614
 615         free(envpath);
 616
 617         return path;
 618 }
 619
 620 static void free_path_split(char **path)
 621 {
 622         char **p = path;
 623
 624         if (!path)
 625                 return;
 626
 627         while (*p)
 628                 free(*p++);
 629         free(path);
 630 }
 631
 632 /*
 633  * exe_only means that we only want to detect .exe files, but not scripts
 634  * (which do not have an extension)
 635  */
 636 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 637 {
 638         char path[MAX_PATH];
 639         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 640
 641         if (!isexe && access(path, F_OK) == 0)
 642                 return xstrdup(path);
 643         path[strlen(path)-4] = '\0';
 644         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 645                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 646                         return xstrdup(path);
 647         return NULL;
 648 }
 649
 650 /*
 651  * Determines the absolute path of cmd using the split path in path.
 652  * If cmd contains a slash or backslash, no lookup is performed.
 653  */
 654 static char *path_lookup(const char *cmd, char **path, int exe_only)
 655 {
 656         char *prog = NULL;
 657         int len = strlen(cmd);
 658         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 659
 660         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 661                 prog = xstrdup(cmd);
 662
 663         while (!prog && *path)
 664                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 665
 666         return prog;
 667 }
 668
 669 static int env_compare(const void *a, const void *b)
 670 {
 671         char *const *ea = a;
 672         char *const *eb = b;
 673         return strcasecmp(*ea, *eb);
 674 }
 675
 676 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 677                               const char *dir,
 678                               int prepend_cmd, int fhin, int fhout, int fherr)
 679 {
 680         STARTUPINFO si;
 681         PROCESS_INFORMATION pi;
 682         struct strbuf envblk, args;
 683         unsigned flags;
 684         BOOL ret;
 685
 686         /* Determine whether or not we are associated to a console */
 687         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 688                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 689                         FILE_ATTRIBUTE_NORMAL, NULL);
 690         if (cons == INVALID_HANDLE_VALUE) {
 691                 /* There is no console associated with this process.
 692                  * Since the child is a console process, Windows
 693                  * would normally create a console window. But
 694                  * since we'll be redirecting std streams, we do
 695                  * not need the console.
 696                  * It is necessary to use DETACHED_PROCESS
 697                  * instead of CREATE_NO_WINDOW to make ssh
 698                  * recognize that it has no console.
 699                  */
 700                 flags = DETACHED_PROCESS;
 701         } else {
 702                 /* There is already a console. If we specified
 703                  * DETACHED_PROCESS here, too, Windows would
 704                  * disassociate the child from the console.
 705                  * The same is true for CREATE_NO_WINDOW.
 706                  * Go figure!
 707                  */
 708                 flags = 0;
 709                 CloseHandle(cons);
 710         }
 711         memset(&si, 0, sizeof(si));
 712         si.cb = sizeof(si);
 713         si.dwFlags = STARTF_USESTDHANDLES;
 714         si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 715         si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 716         si.hStdError = (HANDLE) _get_osfhandle(fherr);
 717
 718         /* concatenate argv, quoting args as we go */
 719         strbuf_init(&args, 0);
 720         if (prepend_cmd) {
 721                 char *quoted = (char *)quote_arg(cmd);
 722                 strbuf_addstr(&args, quoted);
 723                 if (quoted != cmd)
 724                         free(quoted);
 725         }
 726         for (; *argv; argv++) {
 727                 char *quoted = (char *)quote_arg(*argv);
 728                 if (*args.buf)
 729                         strbuf_addch(&args, ' ');
 730                 strbuf_addstr(&args, quoted);
 731                 if (quoted != *argv)
 732                         free(quoted);
 733         }
 734
 735         if (env) {
 736                 int count = 0;
 737                 char **e, **sorted_env;
 738
 739                 for (e = env; *e; e++)
 740                         count++;
 741
 742                 /* environment must be sorted */
 743                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 744                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 745                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 746
 747                 strbuf_init(&envblk, 0);
 748                 for (e = sorted_env; *e; e++) {
 749                         strbuf_addstr(&envblk, *e);
 750                         strbuf_addch(&envblk, '\0');
 751                 }
 752                 free(sorted_env);
 753         }
 754
 755         memset(&pi, 0, sizeof(pi));
 756         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 757                 env ? envblk.buf : NULL, dir, &si, &pi);
 758
 759         if (env)
 760                 strbuf_release(&envblk);
 761         strbuf_release(&args);
 762
 763         if (!ret) {
 764                 errno = ENOENT;
 765                 return -1;
 766         }
 767         CloseHandle(pi.hThread);
 768         return (pid_t)pi.hProcess;
 769 }
 770
 771 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 772                            int prepend_cmd)
 773 {
 774         return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 775 }
 776
 777 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 778                      const char *dir,
 779                      int fhin, int fhout, int fherr)
 780 {
 781         pid_t pid;
 782         char **path = get_path_split();
 783         char *prog = path_lookup(cmd, path, 0);
 784
 785         if (!prog) {
 786                 errno = ENOENT;
 787                 pid = -1;
 788         }
 789         else {
 790                 const char *interpr = parse_interpreter(prog);
 791
 792                 if (interpr) {
 793                         const char *argv0 = argv[0];
 794                         char *iprog = path_lookup(interpr, path, 1);
 795                         argv[0] = prog;
 796                         if (!iprog) {
 797                                 errno = ENOENT;
 798                                 pid = -1;
 799                         }
 800                         else {
 801                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 802                                                        fhin, fhout, fherr);
 803                                 free(iprog);
 804                         }
 805                         argv[0] = argv0;
 806                 }
 807                 else
 808                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
 809                                                fhin, fhout, fherr);
 810                 free(prog);
 811         }
 812         free_path_split(path);
 813         return pid;
 814 }
 815
 816 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 817 {
 818         const char *interpr = parse_interpreter(cmd);
 819         char **path;
 820         char *prog;
 821         int pid = 0;
 822
 823         if (!interpr)
 824                 return 0;
 825         path = get_path_split();
 826         prog = path_lookup(interpr, path, 1);
 827         if (prog) {
 828                 int argc = 0;
 829                 const char **argv2;
 830                 while (argv[argc]) argc++;
 831                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
 832                 argv2[0] = (char *)cmd; /* full path to the script file */
 833                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 834                 pid = mingw_spawnve(prog, argv2, env, 1);
 835                 if (pid >= 0) {
 836                         int status;
 837                         if (waitpid(pid, &status, 0) < 0)
 838                                 status = 255;
 839                         exit(status);
 840                 }
 841                 pid = 1;        /* indicate that we tried but failed */
 842                 free(prog);
 843                 free(argv2);
 844         }
 845         free_path_split(path);
 846         return pid;
 847 }
 848
 849 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 850 {
 851         /* check if git_command is a shell script */
 852         if (!try_shell_exec(cmd, argv, (char **)env)) {
 853                 int pid, status;
 854
 855                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 856                 if (pid < 0)
 857                         return;
 858                 if (waitpid(pid, &status, 0) < 0)
 859                         status = 255;
 860                 exit(status);
 861         }
 862 }
 863
 864 void mingw_execvp(const char *cmd, char *const *argv)
 865 {
 866         char **path = get_path_split();
 867         char *prog = path_lookup(cmd, path, 0);
 868
 869         if (prog) {
 870                 mingw_execve(prog, argv, environ);
 871                 free(prog);
 872         } else
 873                 errno = ENOENT;
 874
 875         free_path_split(path);
 876 }
 877
 878 static char **copy_environ(void)
 879 {
 880         char **env;
 881         int i = 0;
 882         while (environ[i])
 883                 i++;
 884         env = xmalloc((i+1)*sizeof(*env));
 885         for (i = 0; environ[i]; i++)
 886                 env[i] = xstrdup(environ[i]);
 887         env[i] = NULL;
 888         return env;
 889 }
 890
 891 void free_environ(char **env)
 892 {
 893         int i;
 894         for (i = 0; env[i]; i++)
 895                 free(env[i]);
 896         free(env);
 897 }
 898
 899 static int lookup_env(char **env, const char *name, size_t nmln)
 900 {
 901         int i;
 902
 903         for (i = 0; env[i]; i++) {
 904                 if (0 == strncmp(env[i], name, nmln)
 905                     && '=' == env[i][nmln])
 906                         /* matches */
 907                         return i;
 908         }
 909         return -1;
 910 }
 911
 912 /*
 913  * If name contains '=', then sets the variable, otherwise it unsets it
 914  */
 915 static char **env_setenv(char **env, const char *name)
 916 {
 917         char *eq = strchrnul(name, '=');
 918         int i = lookup_env(env, name, eq-name);
 919
 920         if (i < 0) {
 921                 if (*eq) {
 922                         for (i = 0; env[i]; i++)
 923                                 ;
 924                         env = xrealloc(env, (i+2)*sizeof(*env));
 925                         env[i] = xstrdup(name);
 926                         env[i+1] = NULL;
 927                 }
 928         }
 929         else {
 930                 free(env[i]);
 931                 if (*eq)
 932                         env[i] = xstrdup(name);
 933                 else
 934                         for (; env[i]; i++)
 935                                 env[i] = env[i+1];
 936         }
 937         return env;
 938 }
 939
 940 /*
 941  * Copies global environ and adjusts variables as specified by vars.
 942  */
 943 char **make_augmented_environ(const char *const *vars)
 944 {
 945         char **env = copy_environ();
 946
 947         while (*vars)
 948                 env = env_setenv(env, *vars++);
 949         return env;
 950 }
 951
 952 /*
 953  * Note, this isn't a complete replacement for getaddrinfo. It assumes
 954  * that service contains a numerical port, or that it it is null. It
 955  * does a simple search using gethostbyname, and returns one IPv4 host
 956  * if one was found.
 957  */
 958 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
 959                                    const struct addrinfo *hints,
 960                                    struct addrinfo **res)
 961 {
 962         struct hostent *h = gethostbyname(node);
 963         struct addrinfo *ai;
 964         struct sockaddr_in *sin;
 965
 966         if (!h)
 967                 return WSAGetLastError();
 968
 969         ai = xmalloc(sizeof(struct addrinfo));
 970         *res = ai;
 971         ai->ai_flags = 0;
 972         ai->ai_family = AF_INET;
 973         ai->ai_socktype = hints->ai_socktype;
 974         switch (hints->ai_socktype) {
 975         case SOCK_STREAM:
 976                 ai->ai_protocol = IPPROTO_TCP;
 977                 break;
 978         case SOCK_DGRAM:
 979                 ai->ai_protocol = IPPROTO_UDP;
 980                 break;
 981         default:
 982                 ai->ai_protocol = 0;
 983                 break;
 984         }
 985         ai->ai_addrlen = sizeof(struct sockaddr_in);
 986         ai->ai_canonname = strdup(h->h_name);
 987
 988         sin = xmalloc(ai->ai_addrlen);
 989         memset(sin, 0, ai->ai_addrlen);
 990         sin->sin_family = AF_INET;
 991         if (service)
 992                 sin->sin_port = htons(atoi(service));
 993         sin->sin_addr = *(struct in_addr *)h->h_addr;
 994         ai->ai_addr = (struct sockaddr *)sin;
 995         ai->ai_next = 0;
 996         return 0;
 997 }
 998
 999 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1000 {
1001         free(res->ai_canonname);
1002         free(res->ai_addr);
1003         free(res);
1004 }
1005
1006 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1007                                    char *host, DWORD hostlen,
1008                                    char *serv, DWORD servlen, int flags)
1009 {
1010         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1011         if (sa->sa_family != AF_INET)
1012                 return EAI_FAMILY;
1013         if (!host && !serv)
1014                 return EAI_NONAME;
1015
1016         if (host && hostlen > 0) {
1017                 struct hostent *ent = NULL;
1018                 if (!(flags & NI_NUMERICHOST))
1019                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1020                                             sizeof(sin->sin_addr), AF_INET);
1021
1022                 if (ent)
1023                         snprintf(host, hostlen, "%s", ent->h_name);
1024                 else if (flags & NI_NAMEREQD)
1025                         return EAI_NONAME;
1026                 else
1027                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1028         }
1029
1030         if (serv && servlen > 0) {
1031                 struct servent *ent = NULL;
1032                 if (!(flags & NI_NUMERICSERV))
1033                         ent = getservbyport(sin->sin_port,
1034                                             flags & NI_DGRAM ? "udp" : "tcp");
1035
1036                 if (ent)
1037                         snprintf(serv, servlen, "%s", ent->s_name);
1038                 else
1039                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1040         }
1041
1042         return 0;
1043 }
1044
1045 static HMODULE ipv6_dll = NULL;
1046 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1047 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1048                                       const struct addrinfo *hints,
1049                                       struct addrinfo **res);
1050 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1051                                       char *host, DWORD hostlen,
1052                                       char *serv, DWORD servlen, int flags);
1053 /*
1054  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1055  * don't need to try to load that one dynamically.
1056  */
1057
1058 static void socket_cleanup(void)
1059 {
1060         WSACleanup();
1061         if (ipv6_dll)
1062                 FreeLibrary(ipv6_dll);
1063         ipv6_dll = NULL;
1064         ipv6_freeaddrinfo = freeaddrinfo_stub;
1065         ipv6_getaddrinfo = getaddrinfo_stub;
1066         ipv6_getnameinfo = getnameinfo_stub;
1067 }
1068
1069 static void ensure_socket_initialization(void)
1070 {
1071         WSADATA wsa;
1072         static int initialized = 0;
1073         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1074         const char **name;
1075
1076         if (initialized)
1077                 return;
1078
1079         if (WSAStartup(MAKEWORD(2,2), &wsa))
1080                 die("unable to initialize winsock subsystem, error %d",
1081                         WSAGetLastError());
1082
1083         for (name = libraries; *name; name++) {
1084                 ipv6_dll = LoadLibrary(*name);
1085                 if (!ipv6_dll)
1086                         continue;
1087
1088                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1089                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1090                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1091                                                    const struct addrinfo *,
1092                                                    struct addrinfo **))
1093                         GetProcAddress(ipv6_dll, "getaddrinfo");
1094                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1095                                                    socklen_t, char *, DWORD,
1096                                                    char *, DWORD, int))
1097                         GetProcAddress(ipv6_dll, "getnameinfo");
1098                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1099                         FreeLibrary(ipv6_dll);
1100                         ipv6_dll = NULL;
1101                 } else
1102                         break;
1103         }
1104         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1105                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1106                 ipv6_getaddrinfo = getaddrinfo_stub;
1107                 ipv6_getnameinfo = getnameinfo_stub;
1108         }
1109
1110         atexit(socket_cleanup);
1111         initialized = 1;
1112 }
1113
1114 #undef gethostbyname
1115 struct hostent *mingw_gethostbyname(const char *host)
1116 {
1117         ensure_socket_initialization();
1118         return gethostbyname(host);
1119 }
1120
1121 void mingw_freeaddrinfo(struct addrinfo *res)
1122 {
1123         ipv6_freeaddrinfo(res);
1124 }
1125
1126 int mingw_getaddrinfo(const char *node, const char *service,
1127                       const struct addrinfo *hints, struct addrinfo **res)
1128 {
1129         ensure_socket_initialization();
1130         return ipv6_getaddrinfo(node, service, hints, res);
1131 }
1132
1133 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1134                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1135                       int flags)
1136 {
1137         ensure_socket_initialization();
1138         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1139 }
1140
1141 int mingw_socket(int domain, int type, int protocol)
1142 {
1143         int sockfd;
1144         SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
1145         if (s == INVALID_SOCKET) {
1146                 /*
1147                  * WSAGetLastError() values are regular BSD error codes
1148                  * biased by WSABASEERR.
1149                  * However, strerror() does not know about networking
1150                  * specific errors, which are values beginning at 38 or so.
1151                  * Therefore, we choose to leave the biased error code
1152                  * in errno so that _if_ someone looks up the code somewhere,
1153                  * then it is at least the number that are usually listed.
1154                  */
1155                 errno = WSAGetLastError();
1156                 return -1;
1157         }
1158         /* convert into a file descriptor */
1159         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1160                 closesocket(s);
1161                 return error("unable to make a socket file descriptor: %s",
1162                         strerror(errno));
1163         }
1164         return sockfd;
1165 }
1166
1167 #undef connect
1168 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1169 {
1170         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1171         return connect(s, sa, sz);
1172 }
1173
1174 #undef rename
1175 int mingw_rename(const char *pold, const char *pnew)
1176 {
1177         DWORD attrs, gle;
1178         int tries = 0;
1179         static const int delay[] = { 0, 1, 10, 20, 40 };
1180
1181         /*
1182          * Try native rename() first to get errno right.
1183          * It is based on MoveFile(), which cannot overwrite existing files.
1184          */
1185         if (!rename(pold, pnew))
1186                 return 0;
1187         if (errno != EEXIST)
1188                 return -1;
1189 repeat:
1190         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1191                 return 0;
1192         /* TODO: translate more errors */
1193         gle = GetLastError();
1194         if (gle == ERROR_ACCESS_DENIED &&
1195             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1196                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1197                         errno = EISDIR;
1198                         return -1;
1199                 }
1200                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1201                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1202                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1203                                 return 0;
1204                         gle = GetLastError();
1205                         /* revert file attributes on failure */
1206                         SetFileAttributes(pnew, attrs);
1207                 }
1208         }
1209         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1210                 /*
1211                  * We assume that some other process had the source or
1212                  * destination file open at the wrong moment and retry.
1213                  * In order to give the other process a higher chance to
1214                  * complete its operation, we give up our time slice now.
1215                  * If we have to retry again, we do sleep a bit.
1216                  */
1217                 Sleep(delay[tries]);
1218                 tries++;
1219                 goto repeat;
1220         }
1221         errno = EACCES;
1222         return -1;
1223 }
1224
1225 /*
1226  * Note that this doesn't return the actual pagesize, but
1227  * the allocation granularity. If future Windows specific git code
1228  * needs the real getpagesize function, we need to find another solution.
1229  */
1230 int mingw_getpagesize(void)
1231 {
1232         SYSTEM_INFO si;
1233         GetSystemInfo(&si);
1234         return si.dwAllocationGranularity;
1235 }
1236
1237 struct passwd *getpwuid(int uid)
1238 {
1239         static char user_name[100];
1240         static struct passwd p;
1241
1242         DWORD len = sizeof(user_name);
1243         if (!GetUserName(user_name, &len))
1244                 return NULL;
1245         p.pw_name = user_name;
1246         p.pw_gecos = "unknown";
1247         p.pw_dir = NULL;
1248         return &p;
1249 }
1250
1251 static HANDLE timer_event;
1252 static HANDLE timer_thread;
1253 static int timer_interval;
1254 static int one_shot;
1255 static sig_handler_t timer_fn = SIG_DFL;
1256
1257 /* The timer works like this:
1258  * The thread, ticktack(), is a trivial routine that most of the time
1259  * only waits to receive the signal to terminate. The main thread tells
1260  * the thread to terminate by setting the timer_event to the signalled
1261  * state.
1262  * But ticktack() interrupts the wait state after the timer's interval
1263  * length to call the signal handler.
1264  */
1265
1266 static unsigned __stdcall ticktack(void *dummy)
1267 {
1268         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1269                 if (timer_fn == SIG_DFL)
1270                         die("Alarm");
1271                 if (timer_fn != SIG_IGN)
1272                         timer_fn(SIGALRM);
1273                 if (one_shot)
1274                         break;
1275         }
1276         return 0;
1277 }
1278
1279 static int start_timer_thread(void)
1280 {
1281         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1282         if (timer_event) {
1283                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1284                 if (!timer_thread )
1285                         return errno = ENOMEM,
1286                                 error("cannot start timer thread");
1287         } else
1288                 return errno = ENOMEM,
1289                         error("cannot allocate resources for timer");
1290         return 0;
1291 }
1292
1293 static void stop_timer_thread(void)
1294 {
1295         if (timer_event)
1296                 SetEvent(timer_event);  /* tell thread to terminate */
1297         if (timer_thread) {
1298                 int rc = WaitForSingleObject(timer_thread, 1000);
1299                 if (rc == WAIT_TIMEOUT)
1300                         error("timer thread did not terminate timely");
1301                 else if (rc != WAIT_OBJECT_0)
1302                         error("waiting for timer thread failed: %lu",
1303                               GetLastError());
1304                 CloseHandle(timer_thread);
1305         }
1306         if (timer_event)
1307                 CloseHandle(timer_event);
1308         timer_event = NULL;
1309         timer_thread = NULL;
1310 }
1311
1312 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1313 {
1314         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1315 }
1316
1317 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1318 {
1319         static const struct timeval zero;
1320         static int atexit_done;
1321
1322         if (out != NULL)
1323                 return errno = EINVAL,
1324                         error("setitimer param 3 != NULL not implemented");
1325         if (!is_timeval_eq(&in->it_interval, &zero) &&
1326             !is_timeval_eq(&in->it_interval, &in->it_value))
1327                 return errno = EINVAL,
1328                         error("setitimer: it_interval must be zero or eq it_value");
1329
1330         if (timer_thread)
1331                 stop_timer_thread();
1332
1333         if (is_timeval_eq(&in->it_value, &zero) &&
1334             is_timeval_eq(&in->it_interval, &zero))
1335                 return 0;
1336
1337         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1338         one_shot = is_timeval_eq(&in->it_interval, &zero);
1339         if (!atexit_done) {
1340                 atexit(stop_timer_thread);
1341                 atexit_done = 1;
1342         }
1343         return start_timer_thread();
1344 }
1345
1346 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1347 {
1348         if (sig != SIGALRM)
1349                 return errno = EINVAL,
1350                         error("sigaction only implemented for SIGALRM");
1351         if (out != NULL)
1352                 return errno = EINVAL,
1353                         error("sigaction: param 3 != NULL not implemented");
1354
1355         timer_fn = in->sa_handler;
1356         return 0;
1357 }
1358
1359 #undef signal
1360 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1361 {
1362         sig_handler_t old = timer_fn;
1363         if (sig != SIGALRM)
1364                 return signal(sig, handler);
1365         timer_fn = handler;
1366         return old;
1367 }
1368
1369 static const char *make_backslash_path(const char *path)
1370 {
1371         static char buf[PATH_MAX + 1];
1372         char *c;
1373
1374         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1375                 die("Too long path: %.*s", 60, path);
1376
1377         for (c = buf; *c; c++) {
1378                 if (*c == '/')
1379                         *c = '\\';
1380         }
1381         return buf;
1382 }
1383
1384 void mingw_open_html(const char *unixpath)
1385 {
1386         const char *htmlpath = make_backslash_path(unixpath);
1387         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1388                         const char *, const char *, const char *, INT);
1389         T ShellExecute;
1390         HMODULE shell32;
1391
1392         shell32 = LoadLibrary("shell32.dll");
1393         if (!shell32)
1394                 die("cannot load shell32.dll");
1395         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1396         if (!ShellExecute)
1397                 die("cannot run browser");
1398
1399         printf("Launching default browser to display HTML ...\n");
1400         ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1401
1402         FreeLibrary(shell32);
1403 }
1404
1405 int link(const char *oldpath, const char *newpath)
1406 {
1407         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1408         static T create_hard_link = NULL;
1409         if (!create_hard_link) {
1410                 create_hard_link = (T) GetProcAddress(
1411                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1412                 if (!create_hard_link)
1413                         create_hard_link = (T)-1;
1414         }
1415         if (create_hard_link == (T)-1) {
1416                 errno = ENOSYS;
1417                 return -1;
1418         }
1419         if (!create_hard_link(newpath, oldpath, NULL)) {
1420                 errno = err_win_to_posix(GetLastError());
1421                 return -1;
1422         }
1423         return 0;
1424 }
1425
1426 char *getpass(const char *prompt)
1427 {
1428         struct strbuf buf = STRBUF_INIT;
1429
1430         fputs(prompt, stderr);
1431         for (;;) {
1432                 char c = _getch();
1433                 if (c == '\r' || c == '\n')
1434                         break;
1435                 strbuf_addch(&buf, c);
1436         }
1437         fputs("\n", stderr);
1438         return strbuf_detach(&buf, NULL);
1439 }
1440
1441 #ifndef NO_MINGW_REPLACE_READDIR
1442 /* MinGW readdir implementation to avoid extra lstats for Git */
1443 struct mingw_DIR
1444 {
1445         struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1446         struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1447         long                    dd_handle;      /* _findnext handle */
1448         int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1449         char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1450 };
1451
1452 struct dirent *mingw_readdir(DIR *dir)
1453 {
1454         WIN32_FIND_DATAA buf;
1455         HANDLE handle;
1456         struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1457
1458         if (!dir->dd_handle) {
1459                 errno = EBADF; /* No set_errno for mingw */
1460                 return NULL;
1461         }
1462
1463         if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1464         {
1465                 DWORD lasterr;
1466                 handle = FindFirstFileA(dir->dd_name, &buf);
1467                 lasterr = GetLastError();
1468                 dir->dd_handle = (long)handle;
1469                 if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1470                         errno = err_win_to_posix(lasterr);
1471                         return NULL;
1472                 }
1473         } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1474                 return NULL;
1475         } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1476                 DWORD lasterr = GetLastError();
1477                 FindClose((HANDLE)dir->dd_handle);
1478                 dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1479                 /* POSIX says you shouldn't set errno when readdir can't
1480                    find any more files; so, if another error we leave it set. */
1481                 if (lasterr != ERROR_NO_MORE_FILES)
1482                         errno = err_win_to_posix(lasterr);
1483                 return NULL;
1484         }
1485
1486         /* We get here if `buf' contains valid data.  */
1487         strcpy(dir->dd_dir.d_name, buf.cFileName);
1488         ++dir->dd_stat;
1489
1490         /* Set file type, based on WIN32_FIND_DATA */
1491         mdir->dd_dir.d_type = 0;
1492         if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1493                 mdir->dd_dir.d_type |= DT_DIR;
1494         else
1495                 mdir->dd_dir.d_type |= DT_REG;
1496
1497         return (struct dirent*)&dir->dd_dir;
1498 }
1499 #endif // !NO_MINGW_REPLACE_READDIR