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 #include "../run-command.h"
   7
   8 unsigned int _CRT_fmode = _O_BINARY;
   9 static const int delay[] = { 0, 1, 10, 20, 40 };
  10
  11 int err_win_to_posix(DWORD winerr)
  12 {
  13         int error = ENOSYS;
  14         switch(winerr) {
  15         case ERROR_ACCESS_DENIED: error = EACCES; break;
  16         case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  17         case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  18         case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  19         case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  20         case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  21         case ERROR_BAD_COMMAND: error = EIO; break;
  22         case ERROR_BAD_DEVICE: error = ENODEV; break;
  23         case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  24         case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  25         case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  26         case ERROR_BAD_LENGTH: error = EINVAL; break;
  27         case ERROR_BAD_PATHNAME: error = ENOENT; break;
  28         case ERROR_BAD_PIPE: error = EPIPE; break;
  29         case ERROR_BAD_UNIT: error = ENODEV; break;
  30         case ERROR_BAD_USERNAME: error = EINVAL; break;
  31         case ERROR_BROKEN_PIPE: error = EPIPE; break;
  32         case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  33         case ERROR_BUSY: error = EBUSY; break;
  34         case ERROR_BUSY_DRIVE: error = EBUSY; break;
  35         case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  36         case ERROR_CANNOT_MAKE: error = EACCES; break;
  37         case ERROR_CANTOPEN: error = EIO; break;
  38         case ERROR_CANTREAD: error = EIO; break;
  39         case ERROR_CANTWRITE: error = EIO; break;
  40         case ERROR_CRC: error = EIO; break;
  41         case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  42         case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  43         case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  44         case ERROR_DIRECTORY: error = EINVAL; break;
  45         case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  46         case ERROR_DISK_CHANGE: error = EIO; break;
  47         case ERROR_DISK_FULL: error = ENOSPC; break;
  48         case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  49         case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  50         case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  51         case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  52         case ERROR_FILE_EXISTS: error = EEXIST; break;
  53         case ERROR_FILE_INVALID: error = ENODEV; break;
  54         case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  55         case ERROR_GEN_FAILURE: error = EIO; break;
  56         case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  57         case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  58         case ERROR_INVALID_ACCESS: error = EACCES; break;
  59         case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  60         case ERROR_INVALID_BLOCK: error = EFAULT; break;
  61         case ERROR_INVALID_DATA: error = EINVAL; break;
  62         case ERROR_INVALID_DRIVE: error = ENODEV; break;
  63         case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  64         case ERROR_INVALID_FLAGS: error = EINVAL; break;
  65         case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  66         case ERROR_INVALID_HANDLE: error = EBADF; break;
  67         case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  68         case ERROR_INVALID_NAME: error = EINVAL; break;
  69         case ERROR_INVALID_OWNER: error = EINVAL; break;
  70         case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  71         case ERROR_INVALID_PASSWORD: error = EPERM; break;
  72         case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  73         case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  74         case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  75         case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  76         case ERROR_IO_DEVICE: error = EIO; break;
  77         case ERROR_IO_INCOMPLETE: error = EINTR; break;
  78         case ERROR_LOCKED: error = EBUSY; break;
  79         case ERROR_LOCK_VIOLATION: error = EACCES; break;
  80         case ERROR_LOGON_FAILURE: error = EACCES; break;
  81         case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  82         case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  83         case ERROR_MORE_DATA: error = EPIPE; break;
  84         case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  85         case ERROR_NOACCESS: error = EFAULT; break;
  86         case ERROR_NONE_MAPPED: error = EINVAL; break;
  87         case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  88         case ERROR_NOT_READY: error = EAGAIN; break;
  89         case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  90         case ERROR_NO_DATA: error = EPIPE; break;
  91         case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  92         case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  93         case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  94         case ERROR_OPEN_FAILED: error = EIO; break;
  95         case ERROR_OPEN_FILES: error = EBUSY; break;
  96         case ERROR_OPERATION_ABORTED: error = EINTR; break;
  97         case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  98         case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
  99         case ERROR_PATH_BUSY: error = EBUSY; break;
 100         case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
 101         case ERROR_PIPE_BUSY: error = EBUSY; break;
 102         case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 103         case ERROR_PIPE_LISTENING: error = EPIPE; break;
 104         case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 105         case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 106         case ERROR_READ_FAULT: error = EIO; break;
 107         case ERROR_SEEK: error = EIO; break;
 108         case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 109         case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 110         case ERROR_SHARING_VIOLATION: error = EACCES; break;
 111         case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 112         case ERROR_SWAPERROR: error = ENOENT; break;
 113         case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 114         case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 115         case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 116         case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 117         case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 118         case ERROR_WRITE_FAULT: error = EIO; break;
 119         case ERROR_WRITE_PROTECT: error = EROFS; break;
 120         }
 121         return error;
 122 }
 123
 124 static int make_hidden(const char *path)
 125 {
 126         DWORD attribs = GetFileAttributes(path);
 127         if (SetFileAttributes(path, FILE_ATTRIBUTE_HIDDEN | attribs))
 128                 return 0;
 129         errno = err_win_to_posix(GetLastError());
 130         return -1;
 131 }
 132
 133 void mingw_mark_as_git_dir(const char *dir)
 134 {
 135         if (hide_dotfiles != HIDE_DOTFILES_FALSE && make_hidden(dir))
 136                 warning("Failed to make '%s' hidden", dir);
 137         git_config_set("core.hideDotFiles",
 138                 hide_dotfiles == HIDE_DOTFILES_FALSE ? "false" :
 139                 (hide_dotfiles == HIDE_DOTFILES_DOTGITONLY ?
 140                  "dotGitOnly" : "true"));
 141 }
 142
 143 #undef mkdir
 144 int mingw_mkdir(const char *path, int mode)
 145 {
 146         int ret = mkdir(path);
 147         if (!ret && hide_dotfiles == HIDE_DOTFILES_TRUE) {
 148                 /*
 149                  * In Windows a file or dir starting with a dot is not
 150                  * automatically hidden. So lets mark it as hidden when
 151                  * such a directory is created.
 152                  */
 153                 const char *start = basename((char*)path);
 154                 if (*start == '.')
 155                         return make_hidden(path);
 156         }
 157         return ret;
 158 }
 159
 160 static int ask_user_yes_no(const char *format, ...)
 161 {
 162         char answer[5];
 163         char question[4096];
 164         const char *retry_hook[] = { NULL, NULL, NULL };
 165         va_list args;
 166
 167         if ((retry_hook[0] = getenv("GIT_ASK_YESNO"))) {
 168
 169                 va_start(args, format);
 170                 vsnprintf(question, sizeof(question), format, args);
 171                 va_end(args);
 172
 173                 retry_hook[1] = question;
 174                 return !run_command_v_opt(retry_hook, 0);
 175         }
 176
 177         if (!isatty(_fileno(stdin)))
 178                 return 0;
 179
 180         while (1) {
 181                 va_start(args, format);
 182                 vfprintf(stderr, format, args);
 183                 va_end(args);
 184                 fprintf(stderr, " (y/n)? ");
 185
 186                 if (fgets(answer, sizeof(answer), stdin)) {
 187                         /* remove the newline */
 188                         if (answer[strlen(answer)-2] == '\r')
 189                                 answer[strlen(answer)-2] = '\0';
 190                         if (answer[strlen(answer)-1] == '\n')
 191                                 answer[strlen(answer)-1] = '\0';
 192                 } else
 193                         return 0;
 194
 195                 if (answer[0] == 'y' && strlen(answer) == 1)
 196                         return 1;
 197                 if (!strncasecmp(answer, "yes", sizeof(answer)))
 198                         return 1;
 199                 if (answer[0] == 'n' && strlen(answer) == 1)
 200                         return 0;
 201                 if (!strncasecmp(answer, "no", sizeof(answer)))
 202                         return 0;
 203                 fprintf(stderr, "I did not understand your answer: '%s'\n",
 204                                 answer);
 205         }
 206 }
 207
 208 #undef unlink
 209 int mingw_unlink(const char *pathname)
 210 {
 211         int ret, tries = 0;
 212
 213         /* read-only files cannot be removed */
 214         chmod(pathname, 0666);
 215         while ((ret = unlink(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 216                 if (errno != EACCES)
 217                         break;
 218                 /*
 219                  * We assume that some other process had the source or
 220                  * destination file open at the wrong moment and retry.
 221                  * In order to give the other process a higher chance to
 222                  * complete its operation, we give up our time slice now.
 223                  * If we have to retry again, we do sleep a bit.
 224                  */
 225                 Sleep(delay[tries]);
 226                 tries++;
 227         }
 228         while (ret == -1 && errno == EACCES &&
 229                ask_user_yes_no("Unlink of file '%s' failed. "
 230                         "Should I try again?", pathname))
 231                ret = unlink(pathname);
 232         return ret;
 233 }
 234
 235 #undef open
 236 int mingw_open (const char *filename, int oflags, ...)
 237 {
 238         va_list args;
 239         unsigned mode;
 240         int fd;
 241
 242         va_start(args, oflags);
 243         mode = va_arg(args, int);
 244         va_end(args);
 245
 246         if (!strcmp(filename, "/dev/null"))
 247                 filename = "nul";
 248
 249         fd = open(filename, oflags, mode);
 250
 251         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 252                 DWORD attrs = GetFileAttributes(filename);
 253                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 254                         errno = EISDIR;
 255         }
 256         if ((oflags & O_CREAT) && fd >= 0 &&
 257             hide_dotfiles == HIDE_DOTFILES_TRUE) {
 258                 /*
 259                  * In Windows a file or dir starting with a dot is not
 260                  * automatically hidden. So lets mark it as hidden when
 261                  * such a file is created.
 262                  */
 263                 const char *start = basename((char*)filename);
 264                 if (*start == '.' && make_hidden(filename))
 265                         warning("Could not mark '%s' as hidden.", filename);
 266         }
 267         return fd;
 268 }
 269
 270 #undef write
 271 ssize_t mingw_write(int fd, const void *buf, size_t count)
 272 {
 273         /*
 274          * While write() calls to a file on a local disk are translated
 275          * into WriteFile() calls with a maximum size of 64KB on Windows
 276          * XP and 256KB on Vista, no such cap is placed on writes to
 277          * files over the network on Windows XP.  Unfortunately, there
 278          * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 279          * bigger writes fail on Windows XP.
 280          * So we cap to a nice 31MB here to avoid write failures over
 281          * the net without changing the number of WriteFile() calls in
 282          * the local case.
 283          */
 284         return write(fd, buf, min(count, 31 * 1024 * 1024));
 285 }
 286
 287 #undef fopen
 288 FILE *mingw_fopen (const char *filename, const char *otype)
 289 {
 290         int hide = 0;
 291         FILE *file;
 292         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 293             basename((char*)filename)[0] == '.')
 294                 hide = access(filename, F_OK);
 295         if (!strcmp(filename, "/dev/null"))
 296                 filename = "nul";
 297         file = fopen(filename, otype);
 298         if (file && hide && make_hidden(filename))
 299                 warning("Could not mark '%s' as hidden.", filename);
 300         return file;
 301 }
 302
 303 #undef freopen
 304 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 305 {
 306         int hide = 0;
 307         FILE *file;
 308         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 309             basename((char*)filename)[0] == '.')
 310                 hide = access(filename, F_OK);
 311         if (filename && !strcmp(filename, "/dev/null"))
 312                 filename = "nul";
 313         file = freopen(filename, otype, stream);
 314         if (file && hide && make_hidden(filename))
 315                 warning("Could not mark '%s' as hidden.", filename);
 316         return file;
 317 }
 318
 319 /*
 320  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 321  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 322  */
 323 static inline long long filetime_to_hnsec(const FILETIME *ft)
 324 {
 325         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 326         /* Windows to Unix Epoch conversion */
 327         return winTime - 116444736000000000LL;
 328 }
 329
 330 static inline time_t filetime_to_time_t(const FILETIME *ft)
 331 {
 332         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 333 }
 334
 335 /* We keep the do_lstat code in a separate function to avoid recursion.
 336  * When a path ends with a slash, the stat will fail with ENOENT. In
 337  * this case, we strip the trailing slashes and stat again.
 338  */
 339 static int do_lstat(const char *file_name, struct stat *buf)
 340 {
 341         WIN32_FILE_ATTRIBUTE_DATA fdata;
 342
 343         if (!(errno = get_file_attr(file_name, &fdata))) {
 344                 buf->st_ino = 0;
 345                 buf->st_gid = 0;
 346                 buf->st_uid = 0;
 347                 buf->st_nlink = 1;
 348                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 349                 buf->st_size = fdata.nFileSizeLow |
 350                         (((off_t)fdata.nFileSizeHigh)<<32);
 351                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 352                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 353                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 354                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 355                 return 0;
 356         }
 357         return -1;
 358 }
 359
 360 /* We provide our own lstat/fstat functions, since the provided
 361  * lstat/fstat functions are so slow. These stat functions are
 362  * tailored for Git's usage (read: fast), and are not meant to be
 363  * complete. Note that Git stat()s are redirected to mingw_lstat()
 364  * too, since Windows doesn't really handle symlinks that well.
 365  */
 366 int mingw_lstat(const char *file_name, struct stat *buf)
 367 {
 368         int namelen;
 369         static char alt_name[PATH_MAX];
 370
 371         if (!do_lstat(file_name, buf))
 372                 return 0;
 373
 374         /* if file_name ended in a '/', Windows returned ENOENT;
 375          * try again without trailing slashes
 376          */
 377         if (errno != ENOENT)
 378                 return -1;
 379
 380         namelen = strlen(file_name);
 381         if (namelen && file_name[namelen-1] != '/')
 382                 return -1;
 383         while (namelen && file_name[namelen-1] == '/')
 384                 --namelen;
 385         if (!namelen || namelen >= PATH_MAX)
 386                 return -1;
 387
 388         memcpy(alt_name, file_name, namelen);
 389         alt_name[namelen] = 0;
 390         return do_lstat(alt_name, buf);
 391 }
 392
 393 #undef fstat
 394 int mingw_fstat(int fd, struct stat *buf)
 395 {
 396         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 397         BY_HANDLE_FILE_INFORMATION fdata;
 398
 399         if (fh == INVALID_HANDLE_VALUE) {
 400                 errno = EBADF;
 401                 return -1;
 402         }
 403         /* direct non-file handles to MS's fstat() */
 404         if (GetFileType(fh) != FILE_TYPE_DISK)
 405                 return _fstati64(fd, buf);
 406
 407         if (GetFileInformationByHandle(fh, &fdata)) {
 408                 buf->st_ino = 0;
 409                 buf->st_gid = 0;
 410                 buf->st_uid = 0;
 411                 buf->st_nlink = 1;
 412                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 413                 buf->st_size = fdata.nFileSizeLow |
 414                         (((off_t)fdata.nFileSizeHigh)<<32);
 415                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 416                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 417                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 418                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 419                 return 0;
 420         }
 421         errno = EBADF;
 422         return -1;
 423 }
 424
 425 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 426 {
 427         long long winTime = t * 10000000LL + 116444736000000000LL;
 428         ft->dwLowDateTime = winTime;
 429         ft->dwHighDateTime = winTime >> 32;
 430 }
 431
 432 int mingw_utime (const char *file_name, const struct utimbuf *times)
 433 {
 434         FILETIME mft, aft;
 435         int fh, rc;
 436
 437         /* must have write permission */
 438         DWORD attrs = GetFileAttributes(file_name);
 439         if (attrs != INVALID_FILE_ATTRIBUTES &&
 440             (attrs & FILE_ATTRIBUTE_READONLY)) {
 441                 /* ignore errors here; open() will report them */
 442                 SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 443         }
 444
 445         if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 446                 rc = -1;
 447                 goto revert_attrs;
 448         }
 449
 450         if (times) {
 451                 time_t_to_filetime(times->modtime, &mft);
 452                 time_t_to_filetime(times->actime, &aft);
 453         } else {
 454                 GetSystemTimeAsFileTime(&mft);
 455                 aft = mft;
 456         }
 457         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 458                 errno = EINVAL;
 459                 rc = -1;
 460         } else
 461                 rc = 0;
 462         close(fh);
 463
 464 revert_attrs:
 465         if (attrs != INVALID_FILE_ATTRIBUTES &&
 466             (attrs & FILE_ATTRIBUTE_READONLY)) {
 467                 /* ignore errors again */
 468                 SetFileAttributes(file_name, attrs);
 469         }
 470         return rc;
 471 }
 472
 473 unsigned int sleep (unsigned int seconds)
 474 {
 475         Sleep(seconds*1000);
 476         return 0;
 477 }
 478
 479 int mkstemp(char *template)
 480 {
 481         char *filename = mktemp(template);
 482         if (filename == NULL)
 483                 return -1;
 484         return open(filename, O_RDWR | O_CREAT, 0600);
 485 }
 486
 487 int gettimeofday(struct timeval *tv, void *tz)
 488 {
 489         FILETIME ft;
 490         long long hnsec;
 491
 492         GetSystemTimeAsFileTime(&ft);
 493         hnsec = filetime_to_hnsec(&ft);
 494         tv->tv_sec = hnsec / 10000000;
 495         tv->tv_usec = (hnsec % 10000000) / 10;
 496         return 0;
 497 }
 498
 499 int pipe(int filedes[2])
 500 {
 501         HANDLE h[2];
 502
 503         /* this creates non-inheritable handles */
 504         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 505                 errno = err_win_to_posix(GetLastError());
 506                 return -1;
 507         }
 508         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 509         if (filedes[0] < 0) {
 510                 CloseHandle(h[0]);
 511                 CloseHandle(h[1]);
 512                 return -1;
 513         }
 514         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 515         if (filedes[0] < 0) {
 516                 close(filedes[0]);
 517                 CloseHandle(h[1]);
 518                 return -1;
 519         }
 520         return 0;
 521 }
 522
 523 int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 524 {
 525         int i, pending;
 526
 527         if (timeout >= 0) {
 528                 if (nfds == 0) {
 529                         Sleep(timeout);
 530                         return 0;
 531                 }
 532                 return errno = EINVAL, error("poll timeout not supported");
 533         }
 534
 535         /* When there is only one fd to wait for, then we pretend that
 536          * input is available and let the actual wait happen when the
 537          * caller invokes read().
 538          */
 539         if (nfds == 1) {
 540                 if (!(ufds[0].events & POLLIN))
 541                         return errno = EINVAL, error("POLLIN not set");
 542                 ufds[0].revents = POLLIN;
 543                 return 0;
 544         }
 545
 546 repeat:
 547         pending = 0;
 548         for (i = 0; i < nfds; i++) {
 549                 DWORD avail = 0;
 550                 HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 551                 if (h == INVALID_HANDLE_VALUE)
 552                         return -1;      /* errno was set */
 553
 554                 if (!(ufds[i].events & POLLIN))
 555                         return errno = EINVAL, error("POLLIN not set");
 556
 557                 /* this emulation works only for pipes */
 558                 if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 559                         int err = GetLastError();
 560                         if (err == ERROR_BROKEN_PIPE) {
 561                                 ufds[i].revents = POLLHUP;
 562                                 pending++;
 563                         } else {
 564                                 errno = EINVAL;
 565                                 return error("PeekNamedPipe failed,"
 566                                         " GetLastError: %u", err);
 567                         }
 568                 } else if (avail) {
 569                         ufds[i].revents = POLLIN;
 570                         pending++;
 571                 } else
 572                         ufds[i].revents = 0;
 573         }
 574         if (!pending) {
 575                 /* The only times that we spin here is when the process
 576                  * that is connected through the pipes is waiting for
 577                  * its own input data to become available. But since
 578                  * the process (pack-objects) is itself CPU intensive,
 579                  * it will happily pick up the time slice that we are
 580                  * relinquishing here.
 581                  */
 582                 Sleep(0);
 583                 goto repeat;
 584         }
 585         return 0;
 586 }
 587
 588 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 589 {
 590         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 591         memcpy(result, gmtime(timep), sizeof(struct tm));
 592         return result;
 593 }
 594
 595 struct tm *localtime_r(const time_t *timep, struct tm *result)
 596 {
 597         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 598         memcpy(result, localtime(timep), sizeof(struct tm));
 599         return result;
 600 }
 601
 602 #undef getcwd
 603 char *mingw_getcwd(char *pointer, int len)
 604 {
 605         int i;
 606         char *ret = getcwd(pointer, len);
 607         if (!ret)
 608                 return ret;
 609         for (i = 0; pointer[i]; i++)
 610                 if (pointer[i] == '\\')
 611                         pointer[i] = '/';
 612         return ret;
 613 }
 614
 615 #undef getenv
 616 char *mingw_getenv(const char *name)
 617 {
 618         char *result = getenv(name);
 619         if (!result && !strcmp(name, "TMPDIR")) {
 620                 /* on Windows it is TMP and TEMP */
 621                 result = getenv("TMP");
 622                 if (!result)
 623                         result = getenv("TEMP");
 624         }
 625         return result;
 626 }
 627
 628 /*
 629  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 630  * (Parsing C++ Command-Line Arguments)
 631  */
 632 static const char *quote_arg(const char *arg)
 633 {
 634         /* count chars to quote */
 635         int len = 0, n = 0;
 636         int force_quotes = 0;
 637         char *q, *d;
 638         const char *p = arg;
 639         if (!*p) force_quotes = 1;
 640         while (*p) {
 641                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 642                         force_quotes = 1;
 643                 else if (*p == '"')
 644                         n++;
 645                 else if (*p == '\\') {
 646                         int count = 0;
 647                         while (*p == '\\') {
 648                                 count++;
 649                                 p++;
 650                                 len++;
 651                         }
 652                         if (*p == '"')
 653                                 n += count*2 + 1;
 654                         continue;
 655                 }
 656                 len++;
 657                 p++;
 658         }
 659         if (!force_quotes && n == 0)
 660                 return arg;
 661
 662         /* insert \ where necessary */
 663         d = q = xmalloc(len+n+3);
 664         *d++ = '"';
 665         while (*arg) {
 666                 if (*arg == '"')
 667                         *d++ = '\\';
 668                 else if (*arg == '\\') {
 669                         int count = 0;
 670                         while (*arg == '\\') {
 671                                 count++;
 672                                 *d++ = *arg++;
 673                         }
 674                         if (*arg == '"') {
 675                                 while (count-- > 0)
 676                                         *d++ = '\\';
 677                                 *d++ = '\\';
 678                         }
 679                 }
 680                 *d++ = *arg++;
 681         }
 682         *d++ = '"';
 683         *d++ = 0;
 684         return q;
 685 }
 686
 687 static const char *parse_interpreter(const char *cmd)
 688 {
 689         static char buf[100];
 690         char *p, *opt;
 691         int n, fd;
 692
 693         /* don't even try a .exe */
 694         n = strlen(cmd);
 695         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 696                 return NULL;
 697
 698         fd = open(cmd, O_RDONLY);
 699         if (fd < 0)
 700                 return NULL;
 701         n = read(fd, buf, sizeof(buf)-1);
 702         close(fd);
 703         if (n < 4)      /* at least '#!/x' and not error */
 704                 return NULL;
 705
 706         if (buf[0] != '#' || buf[1] != '!')
 707                 return NULL;
 708         buf[n] = '\0';
 709         p = buf + strcspn(buf, "\r\n");
 710         if (!*p)
 711                 return NULL;
 712
 713         *p = '\0';
 714         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 715                 return NULL;
 716         /* strip options */
 717         if ((opt = strchr(p+1, ' ')))
 718                 *opt = '\0';
 719         return p+1;
 720 }
 721
 722 /*
 723  * Splits the PATH into parts.
 724  */
 725 static char **get_path_split(void)
 726 {
 727         char *p, **path, *envpath = getenv("PATH");
 728         int i, n = 0;
 729
 730         if (!envpath || !*envpath)
 731                 return NULL;
 732
 733         envpath = xstrdup(envpath);
 734         p = envpath;
 735         while (p) {
 736                 char *dir = p;
 737                 p = strchr(p, ';');
 738                 if (p) *p++ = '\0';
 739                 if (*dir) {     /* not earlier, catches series of ; */
 740                         ++n;
 741                 }
 742         }
 743         if (!n)
 744                 return NULL;
 745
 746         path = xmalloc((n+1)*sizeof(char *));
 747         p = envpath;
 748         i = 0;
 749         do {
 750                 if (*p)
 751                         path[i++] = xstrdup(p);
 752                 p = p+strlen(p)+1;
 753         } while (i < n);
 754         path[i] = NULL;
 755
 756         free(envpath);
 757
 758         return path;
 759 }
 760
 761 static void free_path_split(char **path)
 762 {
 763         char **p = path;
 764
 765         if (!path)
 766                 return;
 767
 768         while (*p)
 769                 free(*p++);
 770         free(path);
 771 }
 772
 773 /*
 774  * exe_only means that we only want to detect .exe files, but not scripts
 775  * (which do not have an extension)
 776  */
 777 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 778 {
 779         char path[MAX_PATH];
 780         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 781
 782         if (!isexe && access(path, F_OK) == 0)
 783                 return xstrdup(path);
 784         path[strlen(path)-4] = '\0';
 785         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 786                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 787                         return xstrdup(path);
 788         return NULL;
 789 }
 790
 791 /*
 792  * Determines the absolute path of cmd using the split path in path.
 793  * If cmd contains a slash or backslash, no lookup is performed.
 794  */
 795 static char *path_lookup(const char *cmd, char **path, int exe_only)
 796 {
 797         char *prog = NULL;
 798         int len = strlen(cmd);
 799         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 800
 801         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 802                 prog = xstrdup(cmd);
 803
 804         while (!prog && *path)
 805                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 806
 807         return prog;
 808 }
 809
 810 static int env_compare(const void *a, const void *b)
 811 {
 812         char *const *ea = a;
 813         char *const *eb = b;
 814         return strcasecmp(*ea, *eb);
 815 }
 816
 817 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 818                               const char *dir,
 819                               int prepend_cmd, int fhin, int fhout, int fherr)
 820 {
 821         STARTUPINFO si;
 822         PROCESS_INFORMATION pi;
 823         struct strbuf envblk, args;
 824         unsigned flags;
 825         BOOL ret;
 826
 827         /* Determine whether or not we are associated to a console */
 828         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 829                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 830                         FILE_ATTRIBUTE_NORMAL, NULL);
 831         if (cons == INVALID_HANDLE_VALUE) {
 832                 /* There is no console associated with this process.
 833                  * Since the child is a console process, Windows
 834                  * would normally create a console window. But
 835                  * since we'll be redirecting std streams, we do
 836                  * not need the console.
 837                  * It is necessary to use DETACHED_PROCESS
 838                  * instead of CREATE_NO_WINDOW to make ssh
 839                  * recognize that it has no console.
 840                  */
 841                 flags = DETACHED_PROCESS;
 842         } else {
 843                 /* There is already a console. If we specified
 844                  * DETACHED_PROCESS here, too, Windows would
 845                  * disassociate the child from the console.
 846                  * The same is true for CREATE_NO_WINDOW.
 847                  * Go figure!
 848                  */
 849                 flags = 0;
 850                 CloseHandle(cons);
 851         }
 852         memset(&si, 0, sizeof(si));
 853         si.cb = sizeof(si);
 854         si.dwFlags = STARTF_USESTDHANDLES;
 855         si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 856         si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 857         si.hStdError = (HANDLE) _get_osfhandle(fherr);
 858
 859         /* concatenate argv, quoting args as we go */
 860         strbuf_init(&args, 0);
 861         if (prepend_cmd) {
 862                 char *quoted = (char *)quote_arg(cmd);
 863                 strbuf_addstr(&args, quoted);
 864                 if (quoted != cmd)
 865                         free(quoted);
 866         }
 867         for (; *argv; argv++) {
 868                 char *quoted = (char *)quote_arg(*argv);
 869                 if (*args.buf)
 870                         strbuf_addch(&args, ' ');
 871                 strbuf_addstr(&args, quoted);
 872                 if (quoted != *argv)
 873                         free(quoted);
 874         }
 875
 876         if (env) {
 877                 int count = 0;
 878                 char **e, **sorted_env;
 879
 880                 for (e = env; *e; e++)
 881                         count++;
 882
 883                 /* environment must be sorted */
 884                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 885                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 886                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 887
 888                 strbuf_init(&envblk, 0);
 889                 for (e = sorted_env; *e; e++) {
 890                         strbuf_addstr(&envblk, *e);
 891                         strbuf_addch(&envblk, '\0');
 892                 }
 893                 free(sorted_env);
 894         }
 895
 896         memset(&pi, 0, sizeof(pi));
 897         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 898                 env ? envblk.buf : NULL, dir, &si, &pi);
 899
 900         if (env)
 901                 strbuf_release(&envblk);
 902         strbuf_release(&args);
 903
 904         if (!ret) {
 905                 errno = ENOENT;
 906                 return -1;
 907         }
 908         CloseHandle(pi.hThread);
 909         return (pid_t)pi.hProcess;
 910 }
 911
 912 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 913                            int prepend_cmd)
 914 {
 915         return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 916 }
 917
 918 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 919                      const char *dir,
 920                      int fhin, int fhout, int fherr)
 921 {
 922         pid_t pid;
 923         char **path = get_path_split();
 924         char *prog = path_lookup(cmd, path, 0);
 925
 926         if (!prog) {
 927                 errno = ENOENT;
 928                 pid = -1;
 929         }
 930         else {
 931                 const char *interpr = parse_interpreter(prog);
 932
 933                 if (interpr) {
 934                         const char *argv0 = argv[0];
 935                         char *iprog = path_lookup(interpr, path, 1);
 936                         argv[0] = prog;
 937                         if (!iprog) {
 938                                 errno = ENOENT;
 939                                 pid = -1;
 940                         }
 941                         else {
 942                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 943                                                        fhin, fhout, fherr);
 944                                 free(iprog);
 945                         }
 946                         argv[0] = argv0;
 947                 }
 948                 else
 949                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
 950                                                fhin, fhout, fherr);
 951                 free(prog);
 952         }
 953         free_path_split(path);
 954         return pid;
 955 }
 956
 957 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 958 {
 959         const char *interpr = parse_interpreter(cmd);
 960         char **path;
 961         char *prog;
 962         int pid = 0;
 963
 964         if (!interpr)
 965                 return 0;
 966         path = get_path_split();
 967         prog = path_lookup(interpr, path, 1);
 968         if (prog) {
 969                 int argc = 0;
 970                 const char **argv2;
 971                 while (argv[argc]) argc++;
 972                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
 973                 argv2[0] = (char *)cmd; /* full path to the script file */
 974                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 975                 pid = mingw_spawnve(prog, argv2, env, 1);
 976                 if (pid >= 0) {
 977                         int status;
 978                         if (waitpid(pid, &status, 0) < 0)
 979                                 status = 255;
 980                         exit(status);
 981                 }
 982                 pid = 1;        /* indicate that we tried but failed */
 983                 free(prog);
 984                 free(argv2);
 985         }
 986         free_path_split(path);
 987         return pid;
 988 }
 989
 990 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 991 {
 992         /* check if git_command is a shell script */
 993         if (!try_shell_exec(cmd, argv, (char **)env)) {
 994                 int pid, status;
 995
 996                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 997                 if (pid < 0)
 998                         return;
 999                 if (waitpid(pid, &status, 0) < 0)
1000                         status = 255;
1001                 exit(status);
1002         }
1003 }
1004
1005 void mingw_execvp(const char *cmd, char *const *argv)
1006 {
1007         char **path = get_path_split();
1008         char *prog = path_lookup(cmd, path, 0);
1009
1010         if (prog) {
1011                 mingw_execve(prog, argv, environ);
1012                 free(prog);
1013         } else
1014                 errno = ENOENT;
1015
1016         free_path_split(path);
1017 }
1018
1019 static char **copy_environ(void)
1020 {
1021         char **env;
1022         int i = 0;
1023         while (environ[i])
1024                 i++;
1025         env = xmalloc((i+1)*sizeof(*env));
1026         for (i = 0; environ[i]; i++)
1027                 env[i] = xstrdup(environ[i]);
1028         env[i] = NULL;
1029         return env;
1030 }
1031
1032 void free_environ(char **env)
1033 {
1034         int i;
1035         for (i = 0; env[i]; i++)
1036                 free(env[i]);
1037         free(env);
1038 }
1039
1040 static int lookup_env(char **env, const char *name, size_t nmln)
1041 {
1042         int i;
1043
1044         for (i = 0; env[i]; i++) {
1045                 if (0 == strncmp(env[i], name, nmln)
1046                     && '=' == env[i][nmln])
1047                         /* matches */
1048                         return i;
1049         }
1050         return -1;
1051 }
1052
1053 /*
1054  * If name contains '=', then sets the variable, otherwise it unsets it
1055  */
1056 static char **env_setenv(char **env, const char *name)
1057 {
1058         char *eq = strchrnul(name, '=');
1059         int i = lookup_env(env, name, eq-name);
1060
1061         if (i < 0) {
1062                 if (*eq) {
1063                         for (i = 0; env[i]; i++)
1064                                 ;
1065                         env = xrealloc(env, (i+2)*sizeof(*env));
1066                         env[i] = xstrdup(name);
1067                         env[i+1] = NULL;
1068                 }
1069         }
1070         else {
1071                 free(env[i]);
1072                 if (*eq)
1073                         env[i] = xstrdup(name);
1074                 else
1075                         for (; env[i]; i++)
1076                                 env[i] = env[i+1];
1077         }
1078         return env;
1079 }
1080
1081 /*
1082  * Copies global environ and adjusts variables as specified by vars.
1083  */
1084 char **make_augmented_environ(const char *const *vars)
1085 {
1086         char **env = copy_environ();
1087
1088         while (*vars)
1089                 env = env_setenv(env, *vars++);
1090         return env;
1091 }
1092
1093 /*
1094  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1095  * that service contains a numerical port, or that it it is null. It
1096  * does a simple search using gethostbyname, and returns one IPv4 host
1097  * if one was found.
1098  */
1099 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1100                                    const struct addrinfo *hints,
1101                                    struct addrinfo **res)
1102 {
1103         struct hostent *h = gethostbyname(node);
1104         struct addrinfo *ai;
1105         struct sockaddr_in *sin;
1106
1107         if (!h)
1108                 return WSAGetLastError();
1109
1110         ai = xmalloc(sizeof(struct addrinfo));
1111         *res = ai;
1112         ai->ai_flags = 0;
1113         ai->ai_family = AF_INET;
1114         ai->ai_socktype = hints->ai_socktype;
1115         switch (hints->ai_socktype) {
1116         case SOCK_STREAM:
1117                 ai->ai_protocol = IPPROTO_TCP;
1118                 break;
1119         case SOCK_DGRAM:
1120                 ai->ai_protocol = IPPROTO_UDP;
1121                 break;
1122         default:
1123                 ai->ai_protocol = 0;
1124                 break;
1125         }
1126         ai->ai_addrlen = sizeof(struct sockaddr_in);
1127         ai->ai_canonname = strdup(h->h_name);
1128
1129         sin = xmalloc(ai->ai_addrlen);
1130         memset(sin, 0, ai->ai_addrlen);
1131         sin->sin_family = AF_INET;
1132         if (service)
1133                 sin->sin_port = htons(atoi(service));
1134         sin->sin_addr = *(struct in_addr *)h->h_addr;
1135         ai->ai_addr = (struct sockaddr *)sin;
1136         ai->ai_next = 0;
1137         return 0;
1138 }
1139
1140 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1141 {
1142         free(res->ai_canonname);
1143         free(res->ai_addr);
1144         free(res);
1145 }
1146
1147 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1148                                    char *host, DWORD hostlen,
1149                                    char *serv, DWORD servlen, int flags)
1150 {
1151         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1152         if (sa->sa_family != AF_INET)
1153                 return EAI_FAMILY;
1154         if (!host && !serv)
1155                 return EAI_NONAME;
1156
1157         if (host && hostlen > 0) {
1158                 struct hostent *ent = NULL;
1159                 if (!(flags & NI_NUMERICHOST))
1160                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1161                                             sizeof(sin->sin_addr), AF_INET);
1162
1163                 if (ent)
1164                         snprintf(host, hostlen, "%s", ent->h_name);
1165                 else if (flags & NI_NAMEREQD)
1166                         return EAI_NONAME;
1167                 else
1168                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1169         }
1170
1171         if (serv && servlen > 0) {
1172                 struct servent *ent = NULL;
1173                 if (!(flags & NI_NUMERICSERV))
1174                         ent = getservbyport(sin->sin_port,
1175                                             flags & NI_DGRAM ? "udp" : "tcp");
1176
1177                 if (ent)
1178                         snprintf(serv, servlen, "%s", ent->s_name);
1179                 else
1180                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1181         }
1182
1183         return 0;
1184 }
1185
1186 static HMODULE ipv6_dll = NULL;
1187 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1188 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1189                                       const struct addrinfo *hints,
1190                                       struct addrinfo **res);
1191 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1192                                       char *host, DWORD hostlen,
1193                                       char *serv, DWORD servlen, int flags);
1194 /*
1195  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1196  * don't need to try to load that one dynamically.
1197  */
1198
1199 static void socket_cleanup(void)
1200 {
1201         WSACleanup();
1202         if (ipv6_dll)
1203                 FreeLibrary(ipv6_dll);
1204         ipv6_dll = NULL;
1205         ipv6_freeaddrinfo = freeaddrinfo_stub;
1206         ipv6_getaddrinfo = getaddrinfo_stub;
1207         ipv6_getnameinfo = getnameinfo_stub;
1208 }
1209
1210 static void ensure_socket_initialization(void)
1211 {
1212         WSADATA wsa;
1213         static int initialized = 0;
1214         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1215         const char **name;
1216
1217         if (initialized)
1218                 return;
1219
1220         if (WSAStartup(MAKEWORD(2,2), &wsa))
1221                 die("unable to initialize winsock subsystem, error %d",
1222                         WSAGetLastError());
1223
1224         for (name = libraries; *name; name++) {
1225                 ipv6_dll = LoadLibrary(*name);
1226                 if (!ipv6_dll)
1227                         continue;
1228
1229                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1230                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1231                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1232                                                    const struct addrinfo *,
1233                                                    struct addrinfo **))
1234                         GetProcAddress(ipv6_dll, "getaddrinfo");
1235                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1236                                                    socklen_t, char *, DWORD,
1237                                                    char *, DWORD, int))
1238                         GetProcAddress(ipv6_dll, "getnameinfo");
1239                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1240                         FreeLibrary(ipv6_dll);
1241                         ipv6_dll = NULL;
1242                 } else
1243                         break;
1244         }
1245         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1246                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1247                 ipv6_getaddrinfo = getaddrinfo_stub;
1248                 ipv6_getnameinfo = getnameinfo_stub;
1249         }
1250
1251         atexit(socket_cleanup);
1252         initialized = 1;
1253 }
1254
1255 #undef gethostbyname
1256 struct hostent *mingw_gethostbyname(const char *host)
1257 {
1258         ensure_socket_initialization();
1259         return gethostbyname(host);
1260 }
1261
1262 void mingw_freeaddrinfo(struct addrinfo *res)
1263 {
1264         ipv6_freeaddrinfo(res);
1265 }
1266
1267 int mingw_getaddrinfo(const char *node, const char *service,
1268                       const struct addrinfo *hints, struct addrinfo **res)
1269 {
1270         ensure_socket_initialization();
1271         return ipv6_getaddrinfo(node, service, hints, res);
1272 }
1273
1274 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1275                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1276                       int flags)
1277 {
1278         ensure_socket_initialization();
1279         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1280 }
1281
1282 int mingw_socket(int domain, int type, int protocol)
1283 {
1284         int sockfd;
1285         SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
1286         if (s == INVALID_SOCKET) {
1287                 /*
1288                  * WSAGetLastError() values are regular BSD error codes
1289                  * biased by WSABASEERR.
1290                  * However, strerror() does not know about networking
1291                  * specific errors, which are values beginning at 38 or so.
1292                  * Therefore, we choose to leave the biased error code
1293                  * in errno so that _if_ someone looks up the code somewhere,
1294                  * then it is at least the number that are usually listed.
1295                  */
1296                 errno = WSAGetLastError();
1297                 return -1;
1298         }
1299         /* convert into a file descriptor */
1300         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1301                 closesocket(s);
1302                 return error("unable to make a socket file descriptor: %s",
1303                         strerror(errno));
1304         }
1305         return sockfd;
1306 }
1307
1308 #undef connect
1309 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1310 {
1311         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1312         return connect(s, sa, sz);
1313 }
1314
1315 #undef rename
1316 int mingw_rename(const char *pold, const char *pnew)
1317 {
1318         DWORD attrs, gle;
1319         int tries = 0;
1320
1321         /*
1322          * Try native rename() first to get errno right.
1323          * It is based on MoveFile(), which cannot overwrite existing files.
1324          */
1325         if (!rename(pold, pnew))
1326                 return 0;
1327         if (errno != EEXIST)
1328                 return -1;
1329 repeat:
1330         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1331                 return 0;
1332         /* TODO: translate more errors */
1333         gle = GetLastError();
1334         if (gle == ERROR_ACCESS_DENIED &&
1335             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1336                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1337                         errno = EISDIR;
1338                         return -1;
1339                 }
1340                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1341                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1342                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1343                                 return 0;
1344                         gle = GetLastError();
1345                         /* revert file attributes on failure */
1346                         SetFileAttributes(pnew, attrs);
1347                 }
1348         }
1349         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1350                 /*
1351                  * We assume that some other process had the source or
1352                  * destination file open at the wrong moment and retry.
1353                  * In order to give the other process a higher chance to
1354                  * complete its operation, we give up our time slice now.
1355                  * If we have to retry again, we do sleep a bit.
1356                  */
1357                 Sleep(delay[tries]);
1358                 tries++;
1359                 goto repeat;
1360         }
1361         if (gle == ERROR_ACCESS_DENIED &&
1362                ask_user_yes_no("Rename from '%s' to '%s' failed. "
1363                        "Should I try again?", pold, pnew))
1364                 goto repeat;
1365
1366         errno = EACCES;
1367         return -1;
1368 }
1369
1370 /*
1371  * Note that this doesn't return the actual pagesize, but
1372  * the allocation granularity. If future Windows specific git code
1373  * needs the real getpagesize function, we need to find another solution.
1374  */
1375 int mingw_getpagesize(void)
1376 {
1377         SYSTEM_INFO si;
1378         GetSystemInfo(&si);
1379         return si.dwAllocationGranularity;
1380 }
1381
1382 struct passwd *getpwuid(int uid)
1383 {
1384         static char user_name[100];
1385         static struct passwd p;
1386
1387         DWORD len = sizeof(user_name);
1388         if (!GetUserName(user_name, &len))
1389                 return NULL;
1390         p.pw_name = user_name;
1391         p.pw_gecos = "unknown";
1392         p.pw_dir = NULL;
1393         return &p;
1394 }
1395
1396 static HANDLE timer_event;
1397 static HANDLE timer_thread;
1398 static int timer_interval;
1399 static int one_shot;
1400 static sig_handler_t timer_fn = SIG_DFL;
1401
1402 /* The timer works like this:
1403  * The thread, ticktack(), is a trivial routine that most of the time
1404  * only waits to receive the signal to terminate. The main thread tells
1405  * the thread to terminate by setting the timer_event to the signalled
1406  * state.
1407  * But ticktack() interrupts the wait state after the timer's interval
1408  * length to call the signal handler.
1409  */
1410
1411 static unsigned __stdcall ticktack(void *dummy)
1412 {
1413         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1414                 if (timer_fn == SIG_DFL)
1415                         die("Alarm");
1416                 if (timer_fn != SIG_IGN)
1417                         timer_fn(SIGALRM);
1418                 if (one_shot)
1419                         break;
1420         }
1421         return 0;
1422 }
1423
1424 static int start_timer_thread(void)
1425 {
1426         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1427         if (timer_event) {
1428                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1429                 if (!timer_thread )
1430                         return errno = ENOMEM,
1431                                 error("cannot start timer thread");
1432         } else
1433                 return errno = ENOMEM,
1434                         error("cannot allocate resources for timer");
1435         return 0;
1436 }
1437
1438 static void stop_timer_thread(void)
1439 {
1440         if (timer_event)
1441                 SetEvent(timer_event);  /* tell thread to terminate */
1442         if (timer_thread) {
1443                 int rc = WaitForSingleObject(timer_thread, 1000);
1444                 if (rc == WAIT_TIMEOUT)
1445                         error("timer thread did not terminate timely");
1446                 else if (rc != WAIT_OBJECT_0)
1447                         error("waiting for timer thread failed: %lu",
1448                               GetLastError());
1449                 CloseHandle(timer_thread);
1450         }
1451         if (timer_event)
1452                 CloseHandle(timer_event);
1453         timer_event = NULL;
1454         timer_thread = NULL;
1455 }
1456
1457 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1458 {
1459         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1460 }
1461
1462 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1463 {
1464         static const struct timeval zero;
1465         static int atexit_done;
1466
1467         if (out != NULL)
1468                 return errno = EINVAL,
1469                         error("setitimer param 3 != NULL not implemented");
1470         if (!is_timeval_eq(&in->it_interval, &zero) &&
1471             !is_timeval_eq(&in->it_interval, &in->it_value))
1472                 return errno = EINVAL,
1473                         error("setitimer: it_interval must be zero or eq it_value");
1474
1475         if (timer_thread)
1476                 stop_timer_thread();
1477
1478         if (is_timeval_eq(&in->it_value, &zero) &&
1479             is_timeval_eq(&in->it_interval, &zero))
1480                 return 0;
1481
1482         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1483         one_shot = is_timeval_eq(&in->it_interval, &zero);
1484         if (!atexit_done) {
1485                 atexit(stop_timer_thread);
1486                 atexit_done = 1;
1487         }
1488         return start_timer_thread();
1489 }
1490
1491 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1492 {
1493         if (sig != SIGALRM)
1494                 return errno = EINVAL,
1495                         error("sigaction only implemented for SIGALRM");
1496         if (out != NULL)
1497                 return errno = EINVAL,
1498                         error("sigaction: param 3 != NULL not implemented");
1499
1500         timer_fn = in->sa_handler;
1501         return 0;
1502 }
1503
1504 #undef signal
1505 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1506 {
1507         sig_handler_t old = timer_fn;
1508         if (sig != SIGALRM)
1509                 return signal(sig, handler);
1510         timer_fn = handler;
1511         return old;
1512 }
1513
1514 static const char *make_backslash_path(const char *path)
1515 {
1516         static char buf[PATH_MAX + 1];
1517         char *c;
1518
1519         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1520                 die("Too long path: %.*s", 60, path);
1521
1522         for (c = buf; *c; c++) {
1523                 if (*c == '/')
1524                         *c = '\\';
1525         }
1526         return buf;
1527 }
1528
1529 void mingw_open_html(const char *unixpath)
1530 {
1531         const char *htmlpath = make_backslash_path(unixpath);
1532         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1533                         const char *, const char *, const char *, INT);
1534         T ShellExecute;
1535         HMODULE shell32;
1536
1537         shell32 = LoadLibrary("shell32.dll");
1538         if (!shell32)
1539                 die("cannot load shell32.dll");
1540         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1541         if (!ShellExecute)
1542                 die("cannot run browser");
1543
1544         printf("Launching default browser to display HTML ...\n");
1545         ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1546
1547         FreeLibrary(shell32);
1548 }
1549
1550 int link(const char *oldpath, const char *newpath)
1551 {
1552         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1553         static T create_hard_link = NULL;
1554         if (!create_hard_link) {
1555                 create_hard_link = (T) GetProcAddress(
1556                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1557                 if (!create_hard_link)
1558                         create_hard_link = (T)-1;
1559         }
1560         if (create_hard_link == (T)-1) {
1561                 errno = ENOSYS;
1562                 return -1;
1563         }
1564         if (!create_hard_link(newpath, oldpath, NULL)) {
1565                 errno = err_win_to_posix(GetLastError());
1566                 return -1;
1567         }
1568         return 0;
1569 }
1570
1571 char *getpass(const char *prompt)
1572 {
1573         struct strbuf buf = STRBUF_INIT;
1574
1575         fputs(prompt, stderr);
1576         for (;;) {
1577                 char c = _getch();
1578                 if (c == '\r' || c == '\n')
1579                         break;
1580                 strbuf_addch(&buf, c);
1581         }
1582         fputs("\n", stderr);
1583         return strbuf_detach(&buf, NULL);
1584 }
1585
1586 #ifndef NO_MINGW_REPLACE_READDIR
1587 /* MinGW readdir implementation to avoid extra lstats for Git */
1588 struct mingw_DIR
1589 {
1590         struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1591         struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1592         long                    dd_handle;      /* _findnext handle */
1593         int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1594         char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1595 };
1596
1597 struct dirent *mingw_readdir(DIR *dir)
1598 {
1599         WIN32_FIND_DATAA buf;
1600         HANDLE handle;
1601         struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1602
1603         if (!dir->dd_handle) {
1604                 errno = EBADF; /* No set_errno for mingw */
1605                 return NULL;
1606         }
1607
1608         if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1609         {
1610                 DWORD lasterr;
1611                 handle = FindFirstFileA(dir->dd_name, &buf);
1612                 lasterr = GetLastError();
1613                 dir->dd_handle = (long)handle;
1614                 if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1615                         errno = err_win_to_posix(lasterr);
1616                         return NULL;
1617                 }
1618         } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1619                 return NULL;
1620         } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1621                 DWORD lasterr = GetLastError();
1622                 FindClose((HANDLE)dir->dd_handle);
1623                 dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1624                 /* POSIX says you shouldn't set errno when readdir can't
1625                    find any more files; so, if another error we leave it set. */
1626                 if (lasterr != ERROR_NO_MORE_FILES)
1627                         errno = err_win_to_posix(lasterr);
1628                 return NULL;
1629         }
1630
1631         /* We get here if `buf' contains valid data.  */
1632         strcpy(dir->dd_dir.d_name, buf.cFileName);
1633         ++dir->dd_stat;
1634
1635         /* Set file type, based on WIN32_FIND_DATA */
1636         mdir->dd_dir.d_type = 0;
1637         if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1638                 mdir->dd_dir.d_type |= DT_DIR;
1639         else
1640                 mdir->dd_dir.d_type |= DT_REG;
1641
1642         return (struct dirent*)&dir->dd_dir;
1643 }
1644 #endif // !NO_MINGW_REPLACE_READDIR