compat/mingw.c

   1 #include "../git-compat-util.h"
   2 #include "win32.h"
   3 #include <conio.h>
   4 #include "../strbuf.h"
   5 #include "../cache.h"
   6
   7 unsigned int _CRT_fmode = _O_BINARY;
   8 static const int delay[] = { 0, 1, 10, 20, 40 };
   9
  10 int err_win_to_posix(DWORD winerr)
  11 {
  12         int error = ENOSYS;
  13         switch(winerr) {
  14         case ERROR_ACCESS_DENIED: error = EACCES; break;
  15         case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  16         case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  17         case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  18         case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  19         case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  20         case ERROR_BAD_COMMAND: error = EIO; break;
  21         case ERROR_BAD_DEVICE: error = ENODEV; break;
  22         case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  23         case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  24         case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  25         case ERROR_BAD_LENGTH: error = EINVAL; break;
  26         case ERROR_BAD_PATHNAME: error = ENOENT; break;
  27         case ERROR_BAD_PIPE: error = EPIPE; break;
  28         case ERROR_BAD_UNIT: error = ENODEV; break;
  29         case ERROR_BAD_USERNAME: error = EINVAL; break;
  30         case ERROR_BROKEN_PIPE: error = EPIPE; break;
  31         case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  32         case ERROR_BUSY: error = EBUSY; break;
  33         case ERROR_BUSY_DRIVE: error = EBUSY; break;
  34         case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  35         case ERROR_CANNOT_MAKE: error = EACCES; break;
  36         case ERROR_CANTOPEN: error = EIO; break;
  37         case ERROR_CANTREAD: error = EIO; break;
  38         case ERROR_CANTWRITE: error = EIO; break;
  39         case ERROR_CRC: error = EIO; break;
  40         case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  41         case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  42         case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  43         case ERROR_DIRECTORY: error = EINVAL; break;
  44         case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  45         case ERROR_DISK_CHANGE: error = EIO; break;
  46         case ERROR_DISK_FULL: error = ENOSPC; break;
  47         case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  48         case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  49         case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  50         case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  51         case ERROR_FILE_EXISTS: error = EEXIST; break;
  52         case ERROR_FILE_INVALID: error = ENODEV; break;
  53         case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  54         case ERROR_GEN_FAILURE: error = EIO; break;
  55         case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  56         case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  57         case ERROR_INVALID_ACCESS: error = EACCES; break;
  58         case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  59         case ERROR_INVALID_BLOCK: error = EFAULT; break;
  60         case ERROR_INVALID_DATA: error = EINVAL; break;
  61         case ERROR_INVALID_DRIVE: error = ENODEV; break;
  62         case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  63         case ERROR_INVALID_FLAGS: error = EINVAL; break;
  64         case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  65         case ERROR_INVALID_HANDLE: error = EBADF; break;
  66         case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  67         case ERROR_INVALID_NAME: error = EINVAL; break;
  68         case ERROR_INVALID_OWNER: error = EINVAL; break;
  69         case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  70         case ERROR_INVALID_PASSWORD: error = EPERM; break;
  71         case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  72         case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  73         case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  74         case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  75         case ERROR_IO_DEVICE: error = EIO; break;
  76         case ERROR_IO_INCOMPLETE: error = EINTR; break;
  77         case ERROR_LOCKED: error = EBUSY; break;
  78         case ERROR_LOCK_VIOLATION: error = EACCES; break;
  79         case ERROR_LOGON_FAILURE: error = EACCES; break;
  80         case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  81         case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  82         case ERROR_MORE_DATA: error = EPIPE; break;
  83         case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  84         case ERROR_NOACCESS: error = EFAULT; break;
  85         case ERROR_NONE_MAPPED: error = EINVAL; break;
  86         case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  87         case ERROR_NOT_READY: error = EAGAIN; break;
  88         case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  89         case ERROR_NO_DATA: error = EPIPE; break;
  90         case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  91         case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  92         case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  93         case ERROR_OPEN_FAILED: error = EIO; break;
  94         case ERROR_OPEN_FILES: error = EBUSY; break;
  95         case ERROR_OPERATION_ABORTED: error = EINTR; break;
  96         case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  97         case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
  98         case ERROR_PATH_BUSY: error = EBUSY; break;
  99         case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
 100         case ERROR_PIPE_BUSY: error = EBUSY; break;
 101         case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 102         case ERROR_PIPE_LISTENING: error = EPIPE; break;
 103         case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 104         case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 105         case ERROR_READ_FAULT: error = EIO; break;
 106         case ERROR_SEEK: error = EIO; break;
 107         case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 108         case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 109         case ERROR_SHARING_VIOLATION: error = EACCES; break;
 110         case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 111         case ERROR_SWAPERROR: error = ENOENT; break;
 112         case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 113         case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 114         case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 115         case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 116         case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 117         case ERROR_WRITE_FAULT: error = EIO; break;
 118         case ERROR_WRITE_PROTECT: error = EROFS; break;
 119         }
 120         return error;
 121 }
 122
 123 static int make_hidden(const char *path)
 124 {
 125         DWORD attribs = GetFileAttributes(path);
 126         if (SetFileAttributes(path, FILE_ATTRIBUTE_HIDDEN | attribs))
 127                 return 0;
 128         errno = err_win_to_posix(GetLastError());
 129         return -1;
 130 }
 131
 132 void mingw_mark_as_git_dir(const char *dir)
 133 {
 134         if (hide_dotfiles != HIDE_DOTFILES_FALSE && make_hidden(dir))
 135                 warning("Failed to make '%s' hidden", dir);
 136         git_config_set("core.hideDotFiles",
 137                 hide_dotfiles == HIDE_DOTFILES_FALSE ? "false" :
 138                 (hide_dotfiles == HIDE_DOTFILES_DOTGITONLY ?
 139                  "dotGitOnly" : "true"));
 140 }
 141
 142 #undef mkdir
 143 int mingw_mkdir(const char *path, int mode)
 144 {
 145         int ret = mkdir(path);
 146         if (!ret && hide_dotfiles == HIDE_DOTFILES_TRUE) {
 147                 /*
 148                  * In Windows a file or dir starting with a dot is not
 149                  * automatically hidden. So lets mark it as hidden when
 150                  * such a directory is created.
 151                  */
 152                 const char *start = basename((char*)path);
 153                 if (*start == '.')
 154                         return make_hidden(path);
 155         }
 156         return ret;
 157 }
 158
 159 #undef unlink
 160 int mingw_unlink(const char *pathname)
 161 {
 162         int ret, tries = 0;
 163
 164         /* read-only files cannot be removed */
 165         chmod(pathname, 0666);
 166         while ((ret = unlink(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 167                 if (errno != EACCES)
 168                         break;
 169                 /*
 170                  * We assume that some other process had the source or
 171                  * destination file open at the wrong moment and retry.
 172                  * In order to give the other process a higher chance to
 173                  * complete its operation, we give up our time slice now.
 174                  * If we have to retry again, we do sleep a bit.
 175                  */
 176                 Sleep(delay[tries]);
 177                 tries++;
 178         }
 179         return ret;
 180 }
 181
 182 #undef open
 183 int mingw_open (const char *filename, int oflags, ...)
 184 {
 185         va_list args;
 186         unsigned mode;
 187         int fd;
 188
 189         va_start(args, oflags);
 190         mode = va_arg(args, int);
 191         va_end(args);
 192
 193         if (!strcmp(filename, "/dev/null"))
 194                 filename = "nul";
 195
 196         fd = open(filename, oflags, mode);
 197
 198         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 199                 DWORD attrs = GetFileAttributes(filename);
 200                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 201                         errno = EISDIR;
 202         }
 203         if ((oflags & O_CREAT) && fd >= 0 &&
 204             hide_dotfiles == HIDE_DOTFILES_TRUE) {
 205                 /*
 206                  * In Windows a file or dir starting with a dot is not
 207                  * automatically hidden. So lets mark it as hidden when
 208                  * such a file is created.
 209                  */
 210                 const char *start = basename((char*)filename);
 211                 if (*start == '.' && make_hidden(filename))
 212                         warning("Could not mark '%s' as hidden.", filename);
 213         }
 214         return fd;
 215 }
 216
 217 #undef write
 218 ssize_t mingw_write(int fd, const void *buf, size_t count)
 219 {
 220         /*
 221          * While write() calls to a file on a local disk are translated
 222          * into WriteFile() calls with a maximum size of 64KB on Windows
 223          * XP and 256KB on Vista, no such cap is placed on writes to
 224          * files over the network on Windows XP.  Unfortunately, there
 225          * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 226          * bigger writes fail on Windows XP.
 227          * So we cap to a nice 31MB here to avoid write failures over
 228          * the net without changing the number of WriteFile() calls in
 229          * the local case.
 230          */
 231         return write(fd, buf, min(count, 31 * 1024 * 1024));
 232 }
 233
 234 #undef fopen
 235 FILE *mingw_fopen (const char *filename, const char *otype)
 236 {
 237         int hide = 0;
 238         FILE *file;
 239         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 240             basename((char*)filename)[0] == '.')
 241                 hide = access(filename, F_OK);
 242         if (!strcmp(filename, "/dev/null"))
 243                 filename = "nul";
 244         file = fopen(filename, otype);
 245         if (file && hide && make_hidden(filename))
 246                 warning("Could not mark '%s' as hidden.", filename);
 247         return file;
 248 }
 249
 250 #undef freopen
 251 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 252 {
 253         int hide = 0;
 254         FILE *file;
 255         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 256             basename((char*)filename)[0] == '.')
 257                 hide = access(filename, F_OK);
 258         if (filename && !strcmp(filename, "/dev/null"))
 259                 filename = "nul";
 260         file = freopen(filename, otype, stream);
 261         if (file && hide && make_hidden(filename))
 262                 warning("Could not mark '%s' as hidden.", filename);
 263         return file;
 264 }
 265
 266 /*
 267  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 268  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 269  */
 270 static inline long long filetime_to_hnsec(const FILETIME *ft)
 271 {
 272         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 273         /* Windows to Unix Epoch conversion */
 274         return winTime - 116444736000000000LL;
 275 }
 276
 277 static inline time_t filetime_to_time_t(const FILETIME *ft)
 278 {
 279         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 280 }
 281
 282 /* We keep the do_lstat code in a separate function to avoid recursion.
 283  * When a path ends with a slash, the stat will fail with ENOENT. In
 284  * this case, we strip the trailing slashes and stat again.
 285  */
 286 static int do_lstat(const char *file_name, struct stat *buf)
 287 {
 288         WIN32_FILE_ATTRIBUTE_DATA fdata;
 289
 290         if (!(errno = get_file_attr(file_name, &fdata))) {
 291                 buf->st_ino = 0;
 292                 buf->st_gid = 0;
 293                 buf->st_uid = 0;
 294                 buf->st_nlink = 1;
 295                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 296                 buf->st_size = fdata.nFileSizeLow |
 297                         (((off_t)fdata.nFileSizeHigh)<<32);
 298                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 299                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 300                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 301                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 302                 return 0;
 303         }
 304         return -1;
 305 }
 306
 307 /* We provide our own lstat/fstat functions, since the provided
 308  * lstat/fstat functions are so slow. These stat functions are
 309  * tailored for Git's usage (read: fast), and are not meant to be
 310  * complete. Note that Git stat()s are redirected to mingw_lstat()
 311  * too, since Windows doesn't really handle symlinks that well.
 312  */
 313 int mingw_lstat(const char *file_name, struct stat *buf)
 314 {
 315         int namelen;
 316         static char alt_name[PATH_MAX];
 317
 318         if (!do_lstat(file_name, buf))
 319                 return 0;
 320
 321         /* if file_name ended in a '/', Windows returned ENOENT;
 322          * try again without trailing slashes
 323          */
 324         if (errno != ENOENT)
 325                 return -1;
 326
 327         namelen = strlen(file_name);
 328         if (namelen && file_name[namelen-1] != '/')
 329                 return -1;
 330         while (namelen && file_name[namelen-1] == '/')
 331                 --namelen;
 332         if (!namelen || namelen >= PATH_MAX)
 333                 return -1;
 334
 335         memcpy(alt_name, file_name, namelen);
 336         alt_name[namelen] = 0;
 337         return do_lstat(alt_name, buf);
 338 }
 339
 340 #undef fstat
 341 int mingw_fstat(int fd, struct stat *buf)
 342 {
 343         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 344         BY_HANDLE_FILE_INFORMATION fdata;
 345
 346         if (fh == INVALID_HANDLE_VALUE) {
 347                 errno = EBADF;
 348                 return -1;
 349         }
 350         /* direct non-file handles to MS's fstat() */
 351         if (GetFileType(fh) != FILE_TYPE_DISK)
 352                 return _fstati64(fd, buf);
 353
 354         if (GetFileInformationByHandle(fh, &fdata)) {
 355                 buf->st_ino = 0;
 356                 buf->st_gid = 0;
 357                 buf->st_uid = 0;
 358                 buf->st_nlink = 1;
 359                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 360                 buf->st_size = fdata.nFileSizeLow |
 361                         (((off_t)fdata.nFileSizeHigh)<<32);
 362                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 363                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 364                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 365                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 366                 return 0;
 367         }
 368         errno = EBADF;
 369         return -1;
 370 }
 371
 372 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 373 {
 374         long long winTime = t * 10000000LL + 116444736000000000LL;
 375         ft->dwLowDateTime = winTime;
 376         ft->dwHighDateTime = winTime >> 32;
 377 }
 378
 379 int mingw_utime (const char *file_name, const struct utimbuf *times)
 380 {
 381         FILETIME mft, aft;
 382         int fh, rc;
 383
 384         /* must have write permission */
 385         DWORD attrs = GetFileAttributes(file_name);
 386         if (attrs != INVALID_FILE_ATTRIBUTES &&
 387             (attrs & FILE_ATTRIBUTE_READONLY)) {
 388                 /* ignore errors here; open() will report them */
 389                 SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 390         }
 391
 392         if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 393                 rc = -1;
 394                 goto revert_attrs;
 395         }
 396
 397         if (times) {
 398                 time_t_to_filetime(times->modtime, &mft);
 399                 time_t_to_filetime(times->actime, &aft);
 400         } else {
 401                 GetSystemTimeAsFileTime(&mft);
 402                 aft = mft;
 403         }
 404         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 405                 errno = EINVAL;
 406                 rc = -1;
 407         } else
 408                 rc = 0;
 409         close(fh);
 410
 411 revert_attrs:
 412         if (attrs != INVALID_FILE_ATTRIBUTES &&
 413             (attrs & FILE_ATTRIBUTE_READONLY)) {
 414                 /* ignore errors again */
 415                 SetFileAttributes(file_name, attrs);
 416         }
 417         return rc;
 418 }
 419
 420 unsigned int sleep (unsigned int seconds)
 421 {
 422         Sleep(seconds*1000);
 423         return 0;
 424 }
 425
 426 int mkstemp(char *template)
 427 {
 428         char *filename = mktemp(template);
 429         if (filename == NULL)
 430                 return -1;
 431         return open(filename, O_RDWR | O_CREAT, 0600);
 432 }
 433
 434 int gettimeofday(struct timeval *tv, void *tz)
 435 {
 436         FILETIME ft;
 437         long long hnsec;
 438
 439         GetSystemTimeAsFileTime(&ft);
 440         hnsec = filetime_to_hnsec(&ft);
 441         tv->tv_sec = hnsec / 10000000;
 442         tv->tv_usec = (hnsec % 10000000) / 10;
 443         return 0;
 444 }
 445
 446 int pipe(int filedes[2])
 447 {
 448         HANDLE h[2];
 449
 450         /* this creates non-inheritable handles */
 451         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 452                 errno = err_win_to_posix(GetLastError());
 453                 return -1;
 454         }
 455         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 456         if (filedes[0] < 0) {
 457                 CloseHandle(h[0]);
 458                 CloseHandle(h[1]);
 459                 return -1;
 460         }
 461         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 462         if (filedes[0] < 0) {
 463                 close(filedes[0]);
 464                 CloseHandle(h[1]);
 465                 return -1;
 466         }
 467         return 0;
 468 }
 469
 470 int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 471 {
 472         int i, pending;
 473
 474         if (timeout >= 0) {
 475                 if (nfds == 0) {
 476                         Sleep(timeout);
 477                         return 0;
 478                 }
 479                 return errno = EINVAL, error("poll timeout not supported");
 480         }
 481
 482         /* When there is only one fd to wait for, then we pretend that
 483          * input is available and let the actual wait happen when the
 484          * caller invokes read().
 485          */
 486         if (nfds == 1) {
 487                 if (!(ufds[0].events & POLLIN))
 488                         return errno = EINVAL, error("POLLIN not set");
 489                 ufds[0].revents = POLLIN;
 490                 return 0;
 491         }
 492
 493 repeat:
 494         pending = 0;
 495         for (i = 0; i < nfds; i++) {
 496                 DWORD avail = 0;
 497                 HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 498                 if (h == INVALID_HANDLE_VALUE)
 499                         return -1;      /* errno was set */
 500
 501                 if (!(ufds[i].events & POLLIN))
 502                         return errno = EINVAL, error("POLLIN not set");
 503
 504                 /* this emulation works only for pipes */
 505                 if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 506                         int err = GetLastError();
 507                         if (err == ERROR_BROKEN_PIPE) {
 508                                 ufds[i].revents = POLLHUP;
 509                                 pending++;
 510                         } else {
 511                                 errno = EINVAL;
 512                                 return error("PeekNamedPipe failed,"
 513                                         " GetLastError: %u", err);
 514                         }
 515                 } else if (avail) {
 516                         ufds[i].revents = POLLIN;
 517                         pending++;
 518                 } else
 519                         ufds[i].revents = 0;
 520         }
 521         if (!pending) {
 522                 /* The only times that we spin here is when the process
 523                  * that is connected through the pipes is waiting for
 524                  * its own input data to become available. But since
 525                  * the process (pack-objects) is itself CPU intensive,
 526                  * it will happily pick up the time slice that we are
 527                  * relinquishing here.
 528                  */
 529                 Sleep(0);
 530                 goto repeat;
 531         }
 532         return 0;
 533 }
 534
 535 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 536 {
 537         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 538         memcpy(result, gmtime(timep), sizeof(struct tm));
 539         return result;
 540 }
 541
 542 struct tm *localtime_r(const time_t *timep, struct tm *result)
 543 {
 544         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 545         memcpy(result, localtime(timep), sizeof(struct tm));
 546         return result;
 547 }
 548
 549 #undef getcwd
 550 char *mingw_getcwd(char *pointer, int len)
 551 {
 552         int i;
 553         char *ret = getcwd(pointer, len);
 554         if (!ret)
 555                 return ret;
 556         for (i = 0; pointer[i]; i++)
 557                 if (pointer[i] == '\\')
 558                         pointer[i] = '/';
 559         return ret;
 560 }
 561
 562 #undef getenv
 563 char *mingw_getenv(const char *name)
 564 {
 565         char *result = getenv(name);
 566         if (!result && !strcmp(name, "TMPDIR")) {
 567                 /* on Windows it is TMP and TEMP */
 568                 result = getenv("TMP");
 569                 if (!result)
 570                         result = getenv("TEMP");
 571         }
 572         return result;
 573 }
 574
 575 /*
 576  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 577  * (Parsing C++ Command-Line Arguments)
 578  */
 579 static const char *quote_arg(const char *arg)
 580 {
 581         /* count chars to quote */
 582         int len = 0, n = 0;
 583         int force_quotes = 0;
 584         char *q, *d;
 585         const char *p = arg;
 586         if (!*p) force_quotes = 1;
 587         while (*p) {
 588                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 589                         force_quotes = 1;
 590                 else if (*p == '"')
 591                         n++;
 592                 else if (*p == '\\') {
 593                         int count = 0;
 594                         while (*p == '\\') {
 595                                 count++;
 596                                 p++;
 597                                 len++;
 598                         }
 599                         if (*p == '"')
 600                                 n += count*2 + 1;
 601                         continue;
 602                 }
 603                 len++;
 604                 p++;
 605         }
 606         if (!force_quotes && n == 0)
 607                 return arg;
 608
 609         /* insert \ where necessary */
 610         d = q = xmalloc(len+n+3);
 611         *d++ = '"';
 612         while (*arg) {
 613                 if (*arg == '"')
 614                         *d++ = '\\';
 615                 else if (*arg == '\\') {
 616                         int count = 0;
 617                         while (*arg == '\\') {
 618                                 count++;
 619                                 *d++ = *arg++;
 620                         }
 621                         if (*arg == '"') {
 622                                 while (count-- > 0)
 623                                         *d++ = '\\';
 624                                 *d++ = '\\';
 625                         }
 626                 }
 627                 *d++ = *arg++;
 628         }
 629         *d++ = '"';
 630         *d++ = 0;
 631         return q;
 632 }
 633
 634 static const char *parse_interpreter(const char *cmd)
 635 {
 636         static char buf[100];
 637         char *p, *opt;
 638         int n, fd;
 639
 640         /* don't even try a .exe */
 641         n = strlen(cmd);
 642         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 643                 return NULL;
 644
 645         fd = open(cmd, O_RDONLY);
 646         if (fd < 0)
 647                 return NULL;
 648         n = read(fd, buf, sizeof(buf)-1);
 649         close(fd);
 650         if (n < 4)      /* at least '#!/x' and not error */
 651                 return NULL;
 652
 653         if (buf[0] != '#' || buf[1] != '!')
 654                 return NULL;
 655         buf[n] = '\0';
 656         p = buf + strcspn(buf, "\r\n");
 657         if (!*p)
 658                 return NULL;
 659
 660         *p = '\0';
 661         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 662                 return NULL;
 663         /* strip options */
 664         if ((opt = strchr(p+1, ' ')))
 665                 *opt = '\0';
 666         return p+1;
 667 }
 668
 669 /*
 670  * Splits the PATH into parts.
 671  */
 672 static char **get_path_split(void)
 673 {
 674         char *p, **path, *envpath = getenv("PATH");
 675         int i, n = 0;
 676
 677         if (!envpath || !*envpath)
 678                 return NULL;
 679
 680         envpath = xstrdup(envpath);
 681         p = envpath;
 682         while (p) {
 683                 char *dir = p;
 684                 p = strchr(p, ';');
 685                 if (p) *p++ = '\0';
 686                 if (*dir) {     /* not earlier, catches series of ; */
 687                         ++n;
 688                 }
 689         }
 690         if (!n)
 691                 return NULL;
 692
 693         path = xmalloc((n+1)*sizeof(char *));
 694         p = envpath;
 695         i = 0;
 696         do {
 697                 if (*p)
 698                         path[i++] = xstrdup(p);
 699                 p = p+strlen(p)+1;
 700         } while (i < n);
 701         path[i] = NULL;
 702
 703         free(envpath);
 704
 705         return path;
 706 }
 707
 708 static void free_path_split(char **path)
 709 {
 710         char **p = path;
 711
 712         if (!path)
 713                 return;
 714
 715         while (*p)
 716                 free(*p++);
 717         free(path);
 718 }
 719
 720 /*
 721  * exe_only means that we only want to detect .exe files, but not scripts
 722  * (which do not have an extension)
 723  */
 724 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 725 {
 726         char path[MAX_PATH];
 727         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 728
 729         if (!isexe && access(path, F_OK) == 0)
 730                 return xstrdup(path);
 731         path[strlen(path)-4] = '\0';
 732         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 733                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 734                         return xstrdup(path);
 735         return NULL;
 736 }
 737
 738 /*
 739  * Determines the absolute path of cmd using the split path in path.
 740  * If cmd contains a slash or backslash, no lookup is performed.
 741  */
 742 static char *path_lookup(const char *cmd, char **path, int exe_only)
 743 {
 744         char *prog = NULL;
 745         int len = strlen(cmd);
 746         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 747
 748         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 749                 prog = xstrdup(cmd);
 750
 751         while (!prog && *path)
 752                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 753
 754         return prog;
 755 }
 756
 757 static int env_compare(const void *a, const void *b)
 758 {
 759         char *const *ea = a;
 760         char *const *eb = b;
 761         return strcasecmp(*ea, *eb);
 762 }
 763
 764 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 765                               const char *dir,
 766                               int prepend_cmd, int fhin, int fhout, int fherr)
 767 {
 768         STARTUPINFO si;
 769         PROCESS_INFORMATION pi;
 770         struct strbuf envblk, args;
 771         unsigned flags;
 772         BOOL ret;
 773
 774         /* Determine whether or not we are associated to a console */
 775         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 776                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 777                         FILE_ATTRIBUTE_NORMAL, NULL);
 778         if (cons == INVALID_HANDLE_VALUE) {
 779                 /* There is no console associated with this process.
 780                  * Since the child is a console process, Windows
 781                  * would normally create a console window. But
 782                  * since we'll be redirecting std streams, we do
 783                  * not need the console.
 784                  * It is necessary to use DETACHED_PROCESS
 785                  * instead of CREATE_NO_WINDOW to make ssh
 786                  * recognize that it has no console.
 787                  */
 788                 flags = DETACHED_PROCESS;
 789         } else {
 790                 /* There is already a console. If we specified
 791                  * DETACHED_PROCESS here, too, Windows would
 792                  * disassociate the child from the console.
 793                  * The same is true for CREATE_NO_WINDOW.
 794                  * Go figure!
 795                  */
 796                 flags = 0;
 797                 CloseHandle(cons);
 798         }
 799         memset(&si, 0, sizeof(si));
 800         si.cb = sizeof(si);
 801         si.dwFlags = STARTF_USESTDHANDLES;
 802         si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 803         si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 804         si.hStdError = (HANDLE) _get_osfhandle(fherr);
 805
 806         /* concatenate argv, quoting args as we go */
 807         strbuf_init(&args, 0);
 808         if (prepend_cmd) {
 809                 char *quoted = (char *)quote_arg(cmd);
 810                 strbuf_addstr(&args, quoted);
 811                 if (quoted != cmd)
 812                         free(quoted);
 813         }
 814         for (; *argv; argv++) {
 815                 char *quoted = (char *)quote_arg(*argv);
 816                 if (*args.buf)
 817                         strbuf_addch(&args, ' ');
 818                 strbuf_addstr(&args, quoted);
 819                 if (quoted != *argv)
 820                         free(quoted);
 821         }
 822
 823         if (env) {
 824                 int count = 0;
 825                 char **e, **sorted_env;
 826
 827                 for (e = env; *e; e++)
 828                         count++;
 829
 830                 /* environment must be sorted */
 831                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 832                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 833                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 834
 835                 strbuf_init(&envblk, 0);
 836                 for (e = sorted_env; *e; e++) {
 837                         strbuf_addstr(&envblk, *e);
 838                         strbuf_addch(&envblk, '\0');
 839                 }
 840                 free(sorted_env);
 841         }
 842
 843         memset(&pi, 0, sizeof(pi));
 844         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 845                 env ? envblk.buf : NULL, dir, &si, &pi);
 846
 847         if (env)
 848                 strbuf_release(&envblk);
 849         strbuf_release(&args);
 850
 851         if (!ret) {
 852                 errno = ENOENT;
 853                 return -1;
 854         }
 855         CloseHandle(pi.hThread);
 856         return (pid_t)pi.hProcess;
 857 }
 858
 859 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 860                            int prepend_cmd)
 861 {
 862         return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 863 }
 864
 865 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 866                      const char *dir,
 867                      int fhin, int fhout, int fherr)
 868 {
 869         pid_t pid;
 870         char **path = get_path_split();
 871         char *prog = path_lookup(cmd, path, 0);
 872
 873         if (!prog) {
 874                 errno = ENOENT;
 875                 pid = -1;
 876         }
 877         else {
 878                 const char *interpr = parse_interpreter(prog);
 879
 880                 if (interpr) {
 881                         const char *argv0 = argv[0];
 882                         char *iprog = path_lookup(interpr, path, 1);
 883                         argv[0] = prog;
 884                         if (!iprog) {
 885                                 errno = ENOENT;
 886                                 pid = -1;
 887                         }
 888                         else {
 889                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 890                                                        fhin, fhout, fherr);
 891                                 free(iprog);
 892                         }
 893                         argv[0] = argv0;
 894                 }
 895                 else
 896                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
 897                                                fhin, fhout, fherr);
 898                 free(prog);
 899         }
 900         free_path_split(path);
 901         return pid;
 902 }
 903
 904 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 905 {
 906         const char *interpr = parse_interpreter(cmd);
 907         char **path;
 908         char *prog;
 909         int pid = 0;
 910
 911         if (!interpr)
 912                 return 0;
 913         path = get_path_split();
 914         prog = path_lookup(interpr, path, 1);
 915         if (prog) {
 916                 int argc = 0;
 917                 const char **argv2;
 918                 while (argv[argc]) argc++;
 919                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
 920                 argv2[0] = (char *)cmd; /* full path to the script file */
 921                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 922                 pid = mingw_spawnve(prog, argv2, env, 1);
 923                 if (pid >= 0) {
 924                         int status;
 925                         if (waitpid(pid, &status, 0) < 0)
 926                                 status = 255;
 927                         exit(status);
 928                 }
 929                 pid = 1;        /* indicate that we tried but failed */
 930                 free(prog);
 931                 free(argv2);
 932         }
 933         free_path_split(path);
 934         return pid;
 935 }
 936
 937 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 938 {
 939         /* check if git_command is a shell script */
 940         if (!try_shell_exec(cmd, argv, (char **)env)) {
 941                 int pid, status;
 942
 943                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 944                 if (pid < 0)
 945                         return;
 946                 if (waitpid(pid, &status, 0) < 0)
 947                         status = 255;
 948                 exit(status);
 949         }
 950 }
 951
 952 void mingw_execvp(const char *cmd, char *const *argv)
 953 {
 954         char **path = get_path_split();
 955         char *prog = path_lookup(cmd, path, 0);
 956
 957         if (prog) {
 958                 mingw_execve(prog, argv, environ);
 959                 free(prog);
 960         } else
 961                 errno = ENOENT;
 962
 963         free_path_split(path);
 964 }
 965
 966 static char **copy_environ(void)
 967 {
 968         char **env;
 969         int i = 0;
 970         while (environ[i])
 971                 i++;
 972         env = xmalloc((i+1)*sizeof(*env));
 973         for (i = 0; environ[i]; i++)
 974                 env[i] = xstrdup(environ[i]);
 975         env[i] = NULL;
 976         return env;
 977 }
 978
 979 void free_environ(char **env)
 980 {
 981         int i;
 982         for (i = 0; env[i]; i++)
 983                 free(env[i]);
 984         free(env);
 985 }
 986
 987 static int lookup_env(char **env, const char *name, size_t nmln)
 988 {
 989         int i;
 990
 991         for (i = 0; env[i]; i++) {
 992                 if (0 == strncmp(env[i], name, nmln)
 993                     && '=' == env[i][nmln])
 994                         /* matches */
 995                         return i;
 996         }
 997         return -1;
 998 }
 999
1000 /*
1001  * If name contains '=', then sets the variable, otherwise it unsets it
1002  */
1003 static char **env_setenv(char **env, const char *name)
1004 {
1005         char *eq = strchrnul(name, '=');
1006         int i = lookup_env(env, name, eq-name);
1007
1008         if (i < 0) {
1009                 if (*eq) {
1010                         for (i = 0; env[i]; i++)
1011                                 ;
1012                         env = xrealloc(env, (i+2)*sizeof(*env));
1013                         env[i] = xstrdup(name);
1014                         env[i+1] = NULL;
1015                 }
1016         }
1017         else {
1018                 free(env[i]);
1019                 if (*eq)
1020                         env[i] = xstrdup(name);
1021                 else
1022                         for (; env[i]; i++)
1023                                 env[i] = env[i+1];
1024         }
1025         return env;
1026 }
1027
1028 /*
1029  * Copies global environ and adjusts variables as specified by vars.
1030  */
1031 char **make_augmented_environ(const char *const *vars)
1032 {
1033         char **env = copy_environ();
1034
1035         while (*vars)
1036                 env = env_setenv(env, *vars++);
1037         return env;
1038 }
1039
1040 /*
1041  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1042  * that service contains a numerical port, or that it it is null. It
1043  * does a simple search using gethostbyname, and returns one IPv4 host
1044  * if one was found.
1045  */
1046 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1047                                    const struct addrinfo *hints,
1048                                    struct addrinfo **res)
1049 {
1050         struct hostent *h = gethostbyname(node);
1051         struct addrinfo *ai;
1052         struct sockaddr_in *sin;
1053
1054         if (!h)
1055                 return WSAGetLastError();
1056
1057         ai = xmalloc(sizeof(struct addrinfo));
1058         *res = ai;
1059         ai->ai_flags = 0;
1060         ai->ai_family = AF_INET;
1061         ai->ai_socktype = hints->ai_socktype;
1062         switch (hints->ai_socktype) {
1063         case SOCK_STREAM:
1064                 ai->ai_protocol = IPPROTO_TCP;
1065                 break;
1066         case SOCK_DGRAM:
1067                 ai->ai_protocol = IPPROTO_UDP;
1068                 break;
1069         default:
1070                 ai->ai_protocol = 0;
1071                 break;
1072         }
1073         ai->ai_addrlen = sizeof(struct sockaddr_in);
1074         ai->ai_canonname = strdup(h->h_name);
1075
1076         sin = xmalloc(ai->ai_addrlen);
1077         memset(sin, 0, ai->ai_addrlen);
1078         sin->sin_family = AF_INET;
1079         if (service)
1080                 sin->sin_port = htons(atoi(service));
1081         sin->sin_addr = *(struct in_addr *)h->h_addr;
1082         ai->ai_addr = (struct sockaddr *)sin;
1083         ai->ai_next = 0;
1084         return 0;
1085 }
1086
1087 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1088 {
1089         free(res->ai_canonname);
1090         free(res->ai_addr);
1091         free(res);
1092 }
1093
1094 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1095                                    char *host, DWORD hostlen,
1096                                    char *serv, DWORD servlen, int flags)
1097 {
1098         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1099         if (sa->sa_family != AF_INET)
1100                 return EAI_FAMILY;
1101         if (!host && !serv)
1102                 return EAI_NONAME;
1103
1104         if (host && hostlen > 0) {
1105                 struct hostent *ent = NULL;
1106                 if (!(flags & NI_NUMERICHOST))
1107                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1108                                             sizeof(sin->sin_addr), AF_INET);
1109
1110                 if (ent)
1111                         snprintf(host, hostlen, "%s", ent->h_name);
1112                 else if (flags & NI_NAMEREQD)
1113                         return EAI_NONAME;
1114                 else
1115                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1116         }
1117
1118         if (serv && servlen > 0) {
1119                 struct servent *ent = NULL;
1120                 if (!(flags & NI_NUMERICSERV))
1121                         ent = getservbyport(sin->sin_port,
1122                                             flags & NI_DGRAM ? "udp" : "tcp");
1123
1124                 if (ent)
1125                         snprintf(serv, servlen, "%s", ent->s_name);
1126                 else
1127                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1128         }
1129
1130         return 0;
1131 }
1132
1133 static HMODULE ipv6_dll = NULL;
1134 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1135 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1136                                       const struct addrinfo *hints,
1137                                       struct addrinfo **res);
1138 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1139                                       char *host, DWORD hostlen,
1140                                       char *serv, DWORD servlen, int flags);
1141 /*
1142  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1143  * don't need to try to load that one dynamically.
1144  */
1145
1146 static void socket_cleanup(void)
1147 {
1148         WSACleanup();
1149         if (ipv6_dll)
1150                 FreeLibrary(ipv6_dll);
1151         ipv6_dll = NULL;
1152         ipv6_freeaddrinfo = freeaddrinfo_stub;
1153         ipv6_getaddrinfo = getaddrinfo_stub;
1154         ipv6_getnameinfo = getnameinfo_stub;
1155 }
1156
1157 static void ensure_socket_initialization(void)
1158 {
1159         WSADATA wsa;
1160         static int initialized = 0;
1161         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1162         const char **name;
1163
1164         if (initialized)
1165                 return;
1166
1167         if (WSAStartup(MAKEWORD(2,2), &wsa))
1168                 die("unable to initialize winsock subsystem, error %d",
1169                         WSAGetLastError());
1170
1171         for (name = libraries; *name; name++) {
1172                 ipv6_dll = LoadLibrary(*name);
1173                 if (!ipv6_dll)
1174                         continue;
1175
1176                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1177                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1178                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1179                                                    const struct addrinfo *,
1180                                                    struct addrinfo **))
1181                         GetProcAddress(ipv6_dll, "getaddrinfo");
1182                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1183                                                    socklen_t, char *, DWORD,
1184                                                    char *, DWORD, int))
1185                         GetProcAddress(ipv6_dll, "getnameinfo");
1186                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1187                         FreeLibrary(ipv6_dll);
1188                         ipv6_dll = NULL;
1189                 } else
1190                         break;
1191         }
1192         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1193                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1194                 ipv6_getaddrinfo = getaddrinfo_stub;
1195                 ipv6_getnameinfo = getnameinfo_stub;
1196         }
1197
1198         atexit(socket_cleanup);
1199         initialized = 1;
1200 }
1201
1202 #undef gethostbyname
1203 struct hostent *mingw_gethostbyname(const char *host)
1204 {
1205         ensure_socket_initialization();
1206         return gethostbyname(host);
1207 }
1208
1209 void mingw_freeaddrinfo(struct addrinfo *res)
1210 {
1211         ipv6_freeaddrinfo(res);
1212 }
1213
1214 int mingw_getaddrinfo(const char *node, const char *service,
1215                       const struct addrinfo *hints, struct addrinfo **res)
1216 {
1217         ensure_socket_initialization();
1218         return ipv6_getaddrinfo(node, service, hints, res);
1219 }
1220
1221 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1222                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1223                       int flags)
1224 {
1225         ensure_socket_initialization();
1226         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1227 }
1228
1229 int mingw_socket(int domain, int type, int protocol)
1230 {
1231         int sockfd;
1232         SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
1233         if (s == INVALID_SOCKET) {
1234                 /*
1235                  * WSAGetLastError() values are regular BSD error codes
1236                  * biased by WSABASEERR.
1237                  * However, strerror() does not know about networking
1238                  * specific errors, which are values beginning at 38 or so.
1239                  * Therefore, we choose to leave the biased error code
1240                  * in errno so that _if_ someone looks up the code somewhere,
1241                  * then it is at least the number that are usually listed.
1242                  */
1243                 errno = WSAGetLastError();
1244                 return -1;
1245         }
1246         /* convert into a file descriptor */
1247         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1248                 closesocket(s);
1249                 return error("unable to make a socket file descriptor: %s",
1250                         strerror(errno));
1251         }
1252         return sockfd;
1253 }
1254
1255 #undef connect
1256 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1257 {
1258         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1259         return connect(s, sa, sz);
1260 }
1261
1262 #undef rename
1263 int mingw_rename(const char *pold, const char *pnew)
1264 {
1265         DWORD attrs, gle;
1266         int tries = 0;
1267
1268         /*
1269          * Try native rename() first to get errno right.
1270          * It is based on MoveFile(), which cannot overwrite existing files.
1271          */
1272         if (!rename(pold, pnew))
1273                 return 0;
1274         if (errno != EEXIST)
1275                 return -1;
1276 repeat:
1277         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1278                 return 0;
1279         /* TODO: translate more errors */
1280         gle = GetLastError();
1281         if (gle == ERROR_ACCESS_DENIED &&
1282             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1283                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1284                         errno = EISDIR;
1285                         return -1;
1286                 }
1287                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1288                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1289                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1290                                 return 0;
1291                         gle = GetLastError();
1292                         /* revert file attributes on failure */
1293                         SetFileAttributes(pnew, attrs);
1294                 }
1295         }
1296         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1297                 /*
1298                  * We assume that some other process had the source or
1299                  * destination file open at the wrong moment and retry.
1300                  * In order to give the other process a higher chance to
1301                  * complete its operation, we give up our time slice now.
1302                  * If we have to retry again, we do sleep a bit.
1303                  */
1304                 Sleep(delay[tries]);
1305                 tries++;
1306                 goto repeat;
1307         }
1308         errno = EACCES;
1309         return -1;
1310 }
1311
1312 /*
1313  * Note that this doesn't return the actual pagesize, but
1314  * the allocation granularity. If future Windows specific git code
1315  * needs the real getpagesize function, we need to find another solution.
1316  */
1317 int mingw_getpagesize(void)
1318 {
1319         SYSTEM_INFO si;
1320         GetSystemInfo(&si);
1321         return si.dwAllocationGranularity;
1322 }
1323
1324 struct passwd *getpwuid(int uid)
1325 {
1326         static char user_name[100];
1327         static struct passwd p;
1328
1329         DWORD len = sizeof(user_name);
1330         if (!GetUserName(user_name, &len))
1331                 return NULL;
1332         p.pw_name = user_name;
1333         p.pw_gecos = "unknown";
1334         p.pw_dir = NULL;
1335         return &p;
1336 }
1337
1338 static HANDLE timer_event;
1339 static HANDLE timer_thread;
1340 static int timer_interval;
1341 static int one_shot;
1342 static sig_handler_t timer_fn = SIG_DFL;
1343
1344 /* The timer works like this:
1345  * The thread, ticktack(), is a trivial routine that most of the time
1346  * only waits to receive the signal to terminate. The main thread tells
1347  * the thread to terminate by setting the timer_event to the signalled
1348  * state.
1349  * But ticktack() interrupts the wait state after the timer's interval
1350  * length to call the signal handler.
1351  */
1352
1353 static unsigned __stdcall ticktack(void *dummy)
1354 {
1355         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1356                 if (timer_fn == SIG_DFL)
1357                         die("Alarm");
1358                 if (timer_fn != SIG_IGN)
1359                         timer_fn(SIGALRM);
1360                 if (one_shot)
1361                         break;
1362         }
1363         return 0;
1364 }
1365
1366 static int start_timer_thread(void)
1367 {
1368         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1369         if (timer_event) {
1370                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1371                 if (!timer_thread )
1372                         return errno = ENOMEM,
1373                                 error("cannot start timer thread");
1374         } else
1375                 return errno = ENOMEM,
1376                         error("cannot allocate resources for timer");
1377         return 0;
1378 }
1379
1380 static void stop_timer_thread(void)
1381 {
1382         if (timer_event)
1383                 SetEvent(timer_event);  /* tell thread to terminate */
1384         if (timer_thread) {
1385                 int rc = WaitForSingleObject(timer_thread, 1000);
1386                 if (rc == WAIT_TIMEOUT)
1387                         error("timer thread did not terminate timely");
1388                 else if (rc != WAIT_OBJECT_0)
1389                         error("waiting for timer thread failed: %lu",
1390                               GetLastError());
1391                 CloseHandle(timer_thread);
1392         }
1393         if (timer_event)
1394                 CloseHandle(timer_event);
1395         timer_event = NULL;
1396         timer_thread = NULL;
1397 }
1398
1399 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1400 {
1401         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1402 }
1403
1404 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1405 {
1406         static const struct timeval zero;
1407         static int atexit_done;
1408
1409         if (out != NULL)
1410                 return errno = EINVAL,
1411                         error("setitimer param 3 != NULL not implemented");
1412         if (!is_timeval_eq(&in->it_interval, &zero) &&
1413             !is_timeval_eq(&in->it_interval, &in->it_value))
1414                 return errno = EINVAL,
1415                         error("setitimer: it_interval must be zero or eq it_value");
1416
1417         if (timer_thread)
1418                 stop_timer_thread();
1419
1420         if (is_timeval_eq(&in->it_value, &zero) &&
1421             is_timeval_eq(&in->it_interval, &zero))
1422                 return 0;
1423
1424         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1425         one_shot = is_timeval_eq(&in->it_interval, &zero);
1426         if (!atexit_done) {
1427                 atexit(stop_timer_thread);
1428                 atexit_done = 1;
1429         }
1430         return start_timer_thread();
1431 }
1432
1433 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1434 {
1435         if (sig != SIGALRM)
1436                 return errno = EINVAL,
1437                         error("sigaction only implemented for SIGALRM");
1438         if (out != NULL)
1439                 return errno = EINVAL,
1440                         error("sigaction: param 3 != NULL not implemented");
1441
1442         timer_fn = in->sa_handler;
1443         return 0;
1444 }
1445
1446 #undef signal
1447 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1448 {
1449         sig_handler_t old = timer_fn;
1450         if (sig != SIGALRM)
1451                 return signal(sig, handler);
1452         timer_fn = handler;
1453         return old;
1454 }
1455
1456 static const char *make_backslash_path(const char *path)
1457 {
1458         static char buf[PATH_MAX + 1];
1459         char *c;
1460
1461         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1462                 die("Too long path: %.*s", 60, path);
1463
1464         for (c = buf; *c; c++) {
1465                 if (*c == '/')
1466                         *c = '\\';
1467         }
1468         return buf;
1469 }
1470
1471 void mingw_open_html(const char *unixpath)
1472 {
1473         const char *htmlpath = make_backslash_path(unixpath);
1474         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1475                         const char *, const char *, const char *, INT);
1476         T ShellExecute;
1477         HMODULE shell32;
1478
1479         shell32 = LoadLibrary("shell32.dll");
1480         if (!shell32)
1481                 die("cannot load shell32.dll");
1482         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1483         if (!ShellExecute)
1484                 die("cannot run browser");
1485
1486         printf("Launching default browser to display HTML ...\n");
1487         ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1488
1489         FreeLibrary(shell32);
1490 }
1491
1492 int link(const char *oldpath, const char *newpath)
1493 {
1494         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1495         static T create_hard_link = NULL;
1496         if (!create_hard_link) {
1497                 create_hard_link = (T) GetProcAddress(
1498                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1499                 if (!create_hard_link)
1500                         create_hard_link = (T)-1;
1501         }
1502         if (create_hard_link == (T)-1) {
1503                 errno = ENOSYS;
1504                 return -1;
1505         }
1506         if (!create_hard_link(newpath, oldpath, NULL)) {
1507                 errno = err_win_to_posix(GetLastError());
1508                 return -1;
1509         }
1510         return 0;
1511 }
1512
1513 char *getpass(const char *prompt)
1514 {
1515         struct strbuf buf = STRBUF_INIT;
1516
1517         fputs(prompt, stderr);
1518         for (;;) {
1519                 char c = _getch();
1520                 if (c == '\r' || c == '\n')
1521                         break;
1522                 strbuf_addch(&buf, c);
1523         }
1524         fputs("\n", stderr);
1525         return strbuf_detach(&buf, NULL);
1526 }
1527
1528 #ifndef NO_MINGW_REPLACE_READDIR
1529 /* MinGW readdir implementation to avoid extra lstats for Git */
1530 struct mingw_DIR
1531 {
1532         struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1533         struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1534         long                    dd_handle;      /* _findnext handle */
1535         int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1536         char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1537 };
1538
1539 struct dirent *mingw_readdir(DIR *dir)
1540 {
1541         WIN32_FIND_DATAA buf;
1542         HANDLE handle;
1543         struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1544
1545         if (!dir->dd_handle) {
1546                 errno = EBADF; /* No set_errno for mingw */
1547                 return NULL;
1548         }
1549
1550         if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1551         {
1552                 DWORD lasterr;
1553                 handle = FindFirstFileA(dir->dd_name, &buf);
1554                 lasterr = GetLastError();
1555                 dir->dd_handle = (long)handle;
1556                 if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1557                         errno = err_win_to_posix(lasterr);
1558                         return NULL;
1559                 }
1560         } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1561                 return NULL;
1562         } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1563                 DWORD lasterr = GetLastError();
1564                 FindClose((HANDLE)dir->dd_handle);
1565                 dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1566                 /* POSIX says you shouldn't set errno when readdir can't
1567                    find any more files; so, if another error we leave it set. */
1568                 if (lasterr != ERROR_NO_MORE_FILES)
1569                         errno = err_win_to_posix(lasterr);
1570                 return NULL;
1571         }
1572
1573         /* We get here if `buf' contains valid data.  */
1574         strcpy(dir->dd_dir.d_name, buf.cFileName);
1575         ++dir->dd_stat;
1576
1577         /* Set file type, based on WIN32_FIND_DATA */
1578         mdir->dd_dir.d_type = 0;
1579         if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1580                 mdir->dd_dir.d_type |= DT_DIR;
1581         else
1582                 mdir->dd_dir.d_type |= DT_REG;
1583
1584         return (struct dirent*)&dir->dd_dir;
1585 }
1586 #endif // !NO_MINGW_REPLACE_READDIR