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