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         time_t_to_filetime(times->modtime, &mft);
 451         time_t_to_filetime(times->actime, &aft);
 452         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 453                 errno = EINVAL;
 454                 rc = -1;
 455         } else
 456                 rc = 0;
 457         close(fh);
 458
 459 revert_attrs:
 460         if (attrs != INVALID_FILE_ATTRIBUTES &&
 461             (attrs & FILE_ATTRIBUTE_READONLY)) {
 462                 /* ignore errors again */
 463                 SetFileAttributes(file_name, attrs);
 464         }
 465         return rc;
 466 }
 467
 468 unsigned int sleep (unsigned int seconds)
 469 {
 470         Sleep(seconds*1000);
 471         return 0;
 472 }
 473
 474 int mkstemp(char *template)
 475 {
 476         char *filename = mktemp(template);
 477         if (filename == NULL)
 478                 return -1;
 479         return open(filename, O_RDWR | O_CREAT, 0600);
 480 }
 481
 482 int gettimeofday(struct timeval *tv, void *tz)
 483 {
 484         FILETIME ft;
 485         long long hnsec;
 486
 487         GetSystemTimeAsFileTime(&ft);
 488         hnsec = filetime_to_hnsec(&ft);
 489         tv->tv_sec = hnsec / 10000000;
 490         tv->tv_usec = (hnsec % 10000000) / 10;
 491         return 0;
 492 }
 493
 494 int pipe(int filedes[2])
 495 {
 496         HANDLE h[2];
 497
 498         /* this creates non-inheritable handles */
 499         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 500                 errno = err_win_to_posix(GetLastError());
 501                 return -1;
 502         }
 503         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 504         if (filedes[0] < 0) {
 505                 CloseHandle(h[0]);
 506                 CloseHandle(h[1]);
 507                 return -1;
 508         }
 509         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 510         if (filedes[0] < 0) {
 511                 close(filedes[0]);
 512                 CloseHandle(h[1]);
 513                 return -1;
 514         }
 515         return 0;
 516 }
 517
 518 int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 519 {
 520         int i, pending;
 521
 522         if (timeout >= 0) {
 523                 if (nfds == 0) {
 524                         Sleep(timeout);
 525                         return 0;
 526                 }
 527                 return errno = EINVAL, error("poll timeout not supported");
 528         }
 529
 530         /* When there is only one fd to wait for, then we pretend that
 531          * input is available and let the actual wait happen when the
 532          * caller invokes read().
 533          */
 534         if (nfds == 1) {
 535                 if (!(ufds[0].events & POLLIN))
 536                         return errno = EINVAL, error("POLLIN not set");
 537                 ufds[0].revents = POLLIN;
 538                 return 0;
 539         }
 540
 541 repeat:
 542         pending = 0;
 543         for (i = 0; i < nfds; i++) {
 544                 DWORD avail = 0;
 545                 HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 546                 if (h == INVALID_HANDLE_VALUE)
 547                         return -1;      /* errno was set */
 548
 549                 if (!(ufds[i].events & POLLIN))
 550                         return errno = EINVAL, error("POLLIN not set");
 551
 552                 /* this emulation works only for pipes */
 553                 if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 554                         int err = GetLastError();
 555                         if (err == ERROR_BROKEN_PIPE) {
 556                                 ufds[i].revents = POLLHUP;
 557                                 pending++;
 558                         } else {
 559                                 errno = EINVAL;
 560                                 return error("PeekNamedPipe failed,"
 561                                         " GetLastError: %u", err);
 562                         }
 563                 } else if (avail) {
 564                         ufds[i].revents = POLLIN;
 565                         pending++;
 566                 } else
 567                         ufds[i].revents = 0;
 568         }
 569         if (!pending) {
 570                 /* The only times that we spin here is when the process
 571                  * that is connected through the pipes is waiting for
 572                  * its own input data to become available. But since
 573                  * the process (pack-objects) is itself CPU intensive,
 574                  * it will happily pick up the time slice that we are
 575                  * relinquishing here.
 576                  */
 577                 Sleep(0);
 578                 goto repeat;
 579         }
 580         return 0;
 581 }
 582
 583 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 584 {
 585         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 586         memcpy(result, gmtime(timep), sizeof(struct tm));
 587         return result;
 588 }
 589
 590 struct tm *localtime_r(const time_t *timep, struct tm *result)
 591 {
 592         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 593         memcpy(result, localtime(timep), sizeof(struct tm));
 594         return result;
 595 }
 596
 597 #undef getcwd
 598 char *mingw_getcwd(char *pointer, int len)
 599 {
 600         int i;
 601         char *ret = getcwd(pointer, len);
 602         if (!ret)
 603                 return ret;
 604         for (i = 0; pointer[i]; i++)
 605                 if (pointer[i] == '\\')
 606                         pointer[i] = '/';
 607         return ret;
 608 }
 609
 610 #undef getenv
 611 char *mingw_getenv(const char *name)
 612 {
 613         char *result = getenv(name);
 614         if (!result && !strcmp(name, "TMPDIR")) {
 615                 /* on Windows it is TMP and TEMP */
 616                 result = getenv("TMP");
 617                 if (!result)
 618                         result = getenv("TEMP");
 619         }
 620         return result;
 621 }
 622
 623 /*
 624  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 625  * (Parsing C++ Command-Line Arguments)
 626  */
 627 static const char *quote_arg(const char *arg)
 628 {
 629         /* count chars to quote */
 630         int len = 0, n = 0;
 631         int force_quotes = 0;
 632         char *q, *d;
 633         const char *p = arg;
 634         if (!*p) force_quotes = 1;
 635         while (*p) {
 636                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 637                         force_quotes = 1;
 638                 else if (*p == '"')
 639                         n++;
 640                 else if (*p == '\\') {
 641                         int count = 0;
 642                         while (*p == '\\') {
 643                                 count++;
 644                                 p++;
 645                                 len++;
 646                         }
 647                         if (*p == '"')
 648                                 n += count*2 + 1;
 649                         continue;
 650                 }
 651                 len++;
 652                 p++;
 653         }
 654         if (!force_quotes && n == 0)
 655                 return arg;
 656
 657         /* insert \ where necessary */
 658         d = q = xmalloc(len+n+3);
 659         *d++ = '"';
 660         while (*arg) {
 661                 if (*arg == '"')
 662                         *d++ = '\\';
 663                 else if (*arg == '\\') {
 664                         int count = 0;
 665                         while (*arg == '\\') {
 666                                 count++;
 667                                 *d++ = *arg++;
 668                         }
 669                         if (*arg == '"') {
 670                                 while (count-- > 0)
 671                                         *d++ = '\\';
 672                                 *d++ = '\\';
 673                         }
 674                 }
 675                 *d++ = *arg++;
 676         }
 677         *d++ = '"';
 678         *d++ = 0;
 679         return q;
 680 }
 681
 682 static const char *parse_interpreter(const char *cmd)
 683 {
 684         static char buf[100];
 685         char *p, *opt;
 686         int n, fd;
 687
 688         /* don't even try a .exe */
 689         n = strlen(cmd);
 690         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 691                 return NULL;
 692
 693         fd = open(cmd, O_RDONLY);
 694         if (fd < 0)
 695                 return NULL;
 696         n = read(fd, buf, sizeof(buf)-1);
 697         close(fd);
 698         if (n < 4)      /* at least '#!/x' and not error */
 699                 return NULL;
 700
 701         if (buf[0] != '#' || buf[1] != '!')
 702                 return NULL;
 703         buf[n] = '\0';
 704         p = buf + strcspn(buf, "\r\n");
 705         if (!*p)
 706                 return NULL;
 707
 708         *p = '\0';
 709         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 710                 return NULL;
 711         /* strip options */
 712         if ((opt = strchr(p+1, ' ')))
 713                 *opt = '\0';
 714         return p+1;
 715 }
 716
 717 /*
 718  * Splits the PATH into parts.
 719  */
 720 static char **get_path_split(void)
 721 {
 722         char *p, **path, *envpath = getenv("PATH");
 723         int i, n = 0;
 724
 725         if (!envpath || !*envpath)
 726                 return NULL;
 727
 728         envpath = xstrdup(envpath);
 729         p = envpath;
 730         while (p) {
 731                 char *dir = p;
 732                 p = strchr(p, ';');
 733                 if (p) *p++ = '\0';
 734                 if (*dir) {     /* not earlier, catches series of ; */
 735                         ++n;
 736                 }
 737         }
 738         if (!n)
 739                 return NULL;
 740
 741         path = xmalloc((n+1)*sizeof(char *));
 742         p = envpath;
 743         i = 0;
 744         do {
 745                 if (*p)
 746                         path[i++] = xstrdup(p);
 747                 p = p+strlen(p)+1;
 748         } while (i < n);
 749         path[i] = NULL;
 750
 751         free(envpath);
 752
 753         return path;
 754 }
 755
 756 static void free_path_split(char **path)
 757 {
 758         char **p = path;
 759
 760         if (!path)
 761                 return;
 762
 763         while (*p)
 764                 free(*p++);
 765         free(path);
 766 }
 767
 768 /*
 769  * exe_only means that we only want to detect .exe files, but not scripts
 770  * (which do not have an extension)
 771  */
 772 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 773 {
 774         char path[MAX_PATH];
 775         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 776
 777         if (!isexe && access(path, F_OK) == 0)
 778                 return xstrdup(path);
 779         path[strlen(path)-4] = '\0';
 780         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 781                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 782                         return xstrdup(path);
 783         return NULL;
 784 }
 785
 786 /*
 787  * Determines the absolute path of cmd using the the split path in path.
 788  * If cmd contains a slash or backslash, no lookup is performed.
 789  */
 790 static char *path_lookup(const char *cmd, char **path, int exe_only)
 791 {
 792         char *prog = NULL;
 793         int len = strlen(cmd);
 794         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 795
 796         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 797                 prog = xstrdup(cmd);
 798
 799         while (!prog && *path)
 800                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 801
 802         return prog;
 803 }
 804
 805 static int env_compare(const void *a, const void *b)
 806 {
 807         char *const *ea = a;
 808         char *const *eb = b;
 809         return strcasecmp(*ea, *eb);
 810 }
 811
 812 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 813                               const char *dir,
 814                               int prepend_cmd, int fhin, int fhout, int fherr)
 815 {
 816         STARTUPINFO si;
 817         PROCESS_INFORMATION pi;
 818         struct strbuf envblk, args;
 819         unsigned flags;
 820         BOOL ret;
 821
 822         /* Determine whether or not we are associated to a console */
 823         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 824                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 825                         FILE_ATTRIBUTE_NORMAL, NULL);
 826         if (cons == INVALID_HANDLE_VALUE) {
 827                 /* There is no console associated with this process.
 828                  * Since the child is a console process, Windows
 829                  * would normally create a console window. But
 830                  * since we'll be redirecting std streams, we do
 831                  * not need the console.
 832                  * It is necessary to use DETACHED_PROCESS
 833                  * instead of CREATE_NO_WINDOW to make ssh
 834                  * recognize that it has no console.
 835                  */
 836                 flags = DETACHED_PROCESS;
 837         } else {
 838                 /* There is already a console. If we specified
 839                  * DETACHED_PROCESS here, too, Windows would
 840                  * disassociate the child from the console.
 841                  * The same is true for CREATE_NO_WINDOW.
 842                  * Go figure!
 843                  */
 844                 flags = 0;
 845                 CloseHandle(cons);
 846         }
 847         memset(&si, 0, sizeof(si));
 848         si.cb = sizeof(si);
 849         si.dwFlags = STARTF_USESTDHANDLES;
 850         si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 851         si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 852         si.hStdError = (HANDLE) _get_osfhandle(fherr);
 853
 854         /* concatenate argv, quoting args as we go */
 855         strbuf_init(&args, 0);
 856         if (prepend_cmd) {
 857                 char *quoted = (char *)quote_arg(cmd);
 858                 strbuf_addstr(&args, quoted);
 859                 if (quoted != cmd)
 860                         free(quoted);
 861         }
 862         for (; *argv; argv++) {
 863                 char *quoted = (char *)quote_arg(*argv);
 864                 if (*args.buf)
 865                         strbuf_addch(&args, ' ');
 866                 strbuf_addstr(&args, quoted);
 867                 if (quoted != *argv)
 868                         free(quoted);
 869         }
 870
 871         if (env) {
 872                 int count = 0;
 873                 char **e, **sorted_env;
 874
 875                 for (e = env; *e; e++)
 876                         count++;
 877
 878                 /* environment must be sorted */
 879                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 880                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 881                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 882
 883                 strbuf_init(&envblk, 0);
 884                 for (e = sorted_env; *e; e++) {
 885                         strbuf_addstr(&envblk, *e);
 886                         strbuf_addch(&envblk, '\0');
 887                 }
 888                 free(sorted_env);
 889         }
 890
 891         memset(&pi, 0, sizeof(pi));
 892         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 893                 env ? envblk.buf : NULL, dir, &si, &pi);
 894
 895         if (env)
 896                 strbuf_release(&envblk);
 897         strbuf_release(&args);
 898
 899         if (!ret) {
 900                 errno = ENOENT;
 901                 return -1;
 902         }
 903         CloseHandle(pi.hThread);
 904         return (pid_t)pi.hProcess;
 905 }
 906
 907 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 908                            int prepend_cmd)
 909 {
 910         return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 911 }
 912
 913 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 914                      const char *dir,
 915                      int fhin, int fhout, int fherr)
 916 {
 917         pid_t pid;
 918         char **path = get_path_split();
 919         char *prog = path_lookup(cmd, path, 0);
 920
 921         if (!prog) {
 922                 errno = ENOENT;
 923                 pid = -1;
 924         }
 925         else {
 926                 const char *interpr = parse_interpreter(prog);
 927
 928                 if (interpr) {
 929                         const char *argv0 = argv[0];
 930                         char *iprog = path_lookup(interpr, path, 1);
 931                         argv[0] = prog;
 932                         if (!iprog) {
 933                                 errno = ENOENT;
 934                                 pid = -1;
 935                         }
 936                         else {
 937                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 938                                                        fhin, fhout, fherr);
 939                                 free(iprog);
 940                         }
 941                         argv[0] = argv0;
 942                 }
 943                 else
 944                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
 945                                                fhin, fhout, fherr);
 946                 free(prog);
 947         }
 948         free_path_split(path);
 949         return pid;
 950 }
 951
 952 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 953 {
 954         const char *interpr = parse_interpreter(cmd);
 955         char **path;
 956         char *prog;
 957         int pid = 0;
 958
 959         if (!interpr)
 960                 return 0;
 961         path = get_path_split();
 962         prog = path_lookup(interpr, path, 1);
 963         if (prog) {
 964                 int argc = 0;
 965                 const char **argv2;
 966                 while (argv[argc]) argc++;
 967                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
 968                 argv2[0] = (char *)cmd; /* full path to the script file */
 969                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 970                 pid = mingw_spawnve(prog, argv2, env, 1);
 971                 if (pid >= 0) {
 972                         int status;
 973                         if (waitpid(pid, &status, 0) < 0)
 974                                 status = 255;
 975                         exit(status);
 976                 }
 977                 pid = 1;        /* indicate that we tried but failed */
 978                 free(prog);
 979                 free(argv2);
 980         }
 981         free_path_split(path);
 982         return pid;
 983 }
 984
 985 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 986 {
 987         /* check if git_command is a shell script */
 988         if (!try_shell_exec(cmd, argv, (char **)env)) {
 989                 int pid, status;
 990
 991                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 992                 if (pid < 0)
 993                         return;
 994                 if (waitpid(pid, &status, 0) < 0)
 995                         status = 255;
 996                 exit(status);
 997         }
 998 }
 999
1000 void mingw_execvp(const char *cmd, char *const *argv)
1001 {
1002         char **path = get_path_split();
1003         char *prog = path_lookup(cmd, path, 0);
1004
1005         if (prog) {
1006                 mingw_execve(prog, argv, environ);
1007                 free(prog);
1008         } else
1009                 errno = ENOENT;
1010
1011         free_path_split(path);
1012 }
1013
1014 static char **copy_environ(void)
1015 {
1016         char **env;
1017         int i = 0;
1018         while (environ[i])
1019                 i++;
1020         env = xmalloc((i+1)*sizeof(*env));
1021         for (i = 0; environ[i]; i++)
1022                 env[i] = xstrdup(environ[i]);
1023         env[i] = NULL;
1024         return env;
1025 }
1026
1027 void free_environ(char **env)
1028 {
1029         int i;
1030         for (i = 0; env[i]; i++)
1031                 free(env[i]);
1032         free(env);
1033 }
1034
1035 static int lookup_env(char **env, const char *name, size_t nmln)
1036 {
1037         int i;
1038
1039         for (i = 0; env[i]; i++) {
1040                 if (0 == strncmp(env[i], name, nmln)
1041                     && '=' == env[i][nmln])
1042                         /* matches */
1043                         return i;
1044         }
1045         return -1;
1046 }
1047
1048 /*
1049  * If name contains '=', then sets the variable, otherwise it unsets it
1050  */
1051 static char **env_setenv(char **env, const char *name)
1052 {
1053         char *eq = strchrnul(name, '=');
1054         int i = lookup_env(env, name, eq-name);
1055
1056         if (i < 0) {
1057                 if (*eq) {
1058                         for (i = 0; env[i]; i++)
1059                                 ;
1060                         env = xrealloc(env, (i+2)*sizeof(*env));
1061                         env[i] = xstrdup(name);
1062                         env[i+1] = NULL;
1063                 }
1064         }
1065         else {
1066                 free(env[i]);
1067                 if (*eq)
1068                         env[i] = xstrdup(name);
1069                 else
1070                         for (; env[i]; i++)
1071                                 env[i] = env[i+1];
1072         }
1073         return env;
1074 }
1075
1076 /*
1077  * Copies global environ and adjusts variables as specified by vars.
1078  */
1079 char **make_augmented_environ(const char *const *vars)
1080 {
1081         char **env = copy_environ();
1082
1083         while (*vars)
1084                 env = env_setenv(env, *vars++);
1085         return env;
1086 }
1087
1088 /*
1089  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1090  * that service contains a numerical port, or that it it is null. It
1091  * does a simple search using gethostbyname, and returns one IPv4 host
1092  * if one was found.
1093  */
1094 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1095                                    const struct addrinfo *hints,
1096                                    struct addrinfo **res)
1097 {
1098         struct hostent *h = gethostbyname(node);
1099         struct addrinfo *ai;
1100         struct sockaddr_in *sin;
1101
1102         if (!h)
1103                 return WSAGetLastError();
1104
1105         ai = xmalloc(sizeof(struct addrinfo));
1106         *res = ai;
1107         ai->ai_flags = 0;
1108         ai->ai_family = AF_INET;
1109         ai->ai_socktype = hints->ai_socktype;
1110         switch (hints->ai_socktype) {
1111         case SOCK_STREAM:
1112                 ai->ai_protocol = IPPROTO_TCP;
1113                 break;
1114         case SOCK_DGRAM:
1115                 ai->ai_protocol = IPPROTO_UDP;
1116                 break;
1117         default:
1118                 ai->ai_protocol = 0;
1119                 break;
1120         }
1121         ai->ai_addrlen = sizeof(struct sockaddr_in);
1122         ai->ai_canonname = strdup(h->h_name);
1123
1124         sin = xmalloc(ai->ai_addrlen);
1125         memset(sin, 0, ai->ai_addrlen);
1126         sin->sin_family = AF_INET;
1127         if (service)
1128                 sin->sin_port = htons(atoi(service));
1129         sin->sin_addr = *(struct in_addr *)h->h_addr;
1130         ai->ai_addr = (struct sockaddr *)sin;
1131         ai->ai_next = 0;
1132         return 0;
1133 }
1134
1135 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1136 {
1137         free(res->ai_canonname);
1138         free(res->ai_addr);
1139         free(res);
1140 }
1141
1142 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1143                                    char *host, DWORD hostlen,
1144                                    char *serv, DWORD servlen, int flags)
1145 {
1146         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1147         if (sa->sa_family != AF_INET)
1148                 return EAI_FAMILY;
1149         if (!host && !serv)
1150                 return EAI_NONAME;
1151
1152         if (host && hostlen > 0) {
1153                 struct hostent *ent = NULL;
1154                 if (!(flags & NI_NUMERICHOST))
1155                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1156                                             sizeof(sin->sin_addr), AF_INET);
1157
1158                 if (ent)
1159                         snprintf(host, hostlen, "%s", ent->h_name);
1160                 else if (flags & NI_NAMEREQD)
1161                         return EAI_NONAME;
1162                 else
1163                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1164         }
1165
1166         if (serv && servlen > 0) {
1167                 struct servent *ent = NULL;
1168                 if (!(flags & NI_NUMERICSERV))
1169                         ent = getservbyport(sin->sin_port,
1170                                             flags & NI_DGRAM ? "udp" : "tcp");
1171
1172                 if (ent)
1173                         snprintf(serv, servlen, "%s", ent->s_name);
1174                 else
1175                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1176         }
1177
1178         return 0;
1179 }
1180
1181 static HMODULE ipv6_dll = NULL;
1182 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1183 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1184                                       const struct addrinfo *hints,
1185                                       struct addrinfo **res);
1186 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1187                                       char *host, DWORD hostlen,
1188                                       char *serv, DWORD servlen, int flags);
1189 /*
1190  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1191  * don't need to try to load that one dynamically.
1192  */
1193
1194 static void socket_cleanup(void)
1195 {
1196         WSACleanup();
1197         if (ipv6_dll)
1198                 FreeLibrary(ipv6_dll);
1199         ipv6_dll = NULL;
1200         ipv6_freeaddrinfo = freeaddrinfo_stub;
1201         ipv6_getaddrinfo = getaddrinfo_stub;
1202         ipv6_getnameinfo = getnameinfo_stub;
1203 }
1204
1205 static void ensure_socket_initialization(void)
1206 {
1207         WSADATA wsa;
1208         static int initialized = 0;
1209         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1210         const char **name;
1211
1212         if (initialized)
1213                 return;
1214
1215         if (WSAStartup(MAKEWORD(2,2), &wsa))
1216                 die("unable to initialize winsock subsystem, error %d",
1217                         WSAGetLastError());
1218
1219         for (name = libraries; *name; name++) {
1220                 ipv6_dll = LoadLibrary(*name);
1221                 if (!ipv6_dll)
1222                         continue;
1223
1224                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1225                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1226                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1227                                                    const struct addrinfo *,
1228                                                    struct addrinfo **))
1229                         GetProcAddress(ipv6_dll, "getaddrinfo");
1230                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1231                                                    socklen_t, char *, DWORD,
1232                                                    char *, DWORD, int))
1233                         GetProcAddress(ipv6_dll, "getnameinfo");
1234                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1235                         FreeLibrary(ipv6_dll);
1236                         ipv6_dll = NULL;
1237                 } else
1238                         break;
1239         }
1240         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1241                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1242                 ipv6_getaddrinfo = getaddrinfo_stub;
1243                 ipv6_getnameinfo = getnameinfo_stub;
1244         }
1245
1246         atexit(socket_cleanup);
1247         initialized = 1;
1248 }
1249
1250 #undef gethostbyname
1251 struct hostent *mingw_gethostbyname(const char *host)
1252 {
1253         ensure_socket_initialization();
1254         return gethostbyname(host);
1255 }
1256
1257 void mingw_freeaddrinfo(struct addrinfo *res)
1258 {
1259         ipv6_freeaddrinfo(res);
1260 }
1261
1262 int mingw_getaddrinfo(const char *node, const char *service,
1263                       const struct addrinfo *hints, struct addrinfo **res)
1264 {
1265         ensure_socket_initialization();
1266         return ipv6_getaddrinfo(node, service, hints, res);
1267 }
1268
1269 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1270                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1271                       int flags)
1272 {
1273         ensure_socket_initialization();
1274         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1275 }
1276
1277 int mingw_socket(int domain, int type, int protocol)
1278 {
1279         int sockfd;
1280         SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
1281         if (s == INVALID_SOCKET) {
1282                 /*
1283                  * WSAGetLastError() values are regular BSD error codes
1284                  * biased by WSABASEERR.
1285                  * However, strerror() does not know about networking
1286                  * specific errors, which are values beginning at 38 or so.
1287                  * Therefore, we choose to leave the biased error code
1288                  * in errno so that _if_ someone looks up the code somewhere,
1289                  * then it is at least the number that are usually listed.
1290                  */
1291                 errno = WSAGetLastError();
1292                 return -1;
1293         }
1294         /* convert into a file descriptor */
1295         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1296                 closesocket(s);
1297                 return error("unable to make a socket file descriptor: %s",
1298                         strerror(errno));
1299         }
1300         return sockfd;
1301 }
1302
1303 #undef connect
1304 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1305 {
1306         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1307         return connect(s, sa, sz);
1308 }
1309
1310 #undef rename
1311 int mingw_rename(const char *pold, const char *pnew)
1312 {
1313         DWORD attrs, gle;
1314         int tries = 0;
1315
1316         /*
1317          * Try native rename() first to get errno right.
1318          * It is based on MoveFile(), which cannot overwrite existing files.
1319          */
1320         if (!rename(pold, pnew))
1321                 return 0;
1322         if (errno != EEXIST)
1323                 return -1;
1324 repeat:
1325         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1326                 return 0;
1327         /* TODO: translate more errors */
1328         gle = GetLastError();
1329         if (gle == ERROR_ACCESS_DENIED &&
1330             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1331                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1332                         errno = EISDIR;
1333                         return -1;
1334                 }
1335                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1336                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1337                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1338                                 return 0;
1339                         gle = GetLastError();
1340                         /* revert file attributes on failure */
1341                         SetFileAttributes(pnew, attrs);
1342                 }
1343         }
1344         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1345                 /*
1346                  * We assume that some other process had the source or
1347                  * destination file open at the wrong moment and retry.
1348                  * In order to give the other process a higher chance to
1349                  * complete its operation, we give up our time slice now.
1350                  * If we have to retry again, we do sleep a bit.
1351                  */
1352                 Sleep(delay[tries]);
1353                 tries++;
1354                 goto repeat;
1355         }
1356         if (gle == ERROR_ACCESS_DENIED &&
1357                ask_user_yes_no("Rename from '%s' to '%s' failed. "
1358                        "Should I try again?", pold, pnew))
1359                 goto repeat;
1360
1361         errno = EACCES;
1362         return -1;
1363 }
1364
1365 /*
1366  * Note that this doesn't return the actual pagesize, but
1367  * the allocation granularity. If future Windows specific git code
1368  * needs the real getpagesize function, we need to find another solution.
1369  */
1370 int mingw_getpagesize(void)
1371 {
1372         SYSTEM_INFO si;
1373         GetSystemInfo(&si);
1374         return si.dwAllocationGranularity;
1375 }
1376
1377 struct passwd *getpwuid(int uid)
1378 {
1379         static char user_name[100];
1380         static struct passwd p;
1381
1382         DWORD len = sizeof(user_name);
1383         if (!GetUserName(user_name, &len))
1384                 return NULL;
1385         p.pw_name = user_name;
1386         p.pw_gecos = "unknown";
1387         p.pw_dir = NULL;
1388         return &p;
1389 }
1390
1391 static HANDLE timer_event;
1392 static HANDLE timer_thread;
1393 static int timer_interval;
1394 static int one_shot;
1395 static sig_handler_t timer_fn = SIG_DFL;
1396
1397 /* The timer works like this:
1398  * The thread, ticktack(), is a trivial routine that most of the time
1399  * only waits to receive the signal to terminate. The main thread tells
1400  * the thread to terminate by setting the timer_event to the signalled
1401  * state.
1402  * But ticktack() interrupts the wait state after the timer's interval
1403  * length to call the signal handler.
1404  */
1405
1406 static unsigned __stdcall ticktack(void *dummy)
1407 {
1408         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1409                 if (timer_fn == SIG_DFL)
1410                         die("Alarm");
1411                 if (timer_fn != SIG_IGN)
1412                         timer_fn(SIGALRM);
1413                 if (one_shot)
1414                         break;
1415         }
1416         return 0;
1417 }
1418
1419 static int start_timer_thread(void)
1420 {
1421         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1422         if (timer_event) {
1423                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1424                 if (!timer_thread )
1425                         return errno = ENOMEM,
1426                                 error("cannot start timer thread");
1427         } else
1428                 return errno = ENOMEM,
1429                         error("cannot allocate resources for timer");
1430         return 0;
1431 }
1432
1433 static void stop_timer_thread(void)
1434 {
1435         if (timer_event)
1436                 SetEvent(timer_event);  /* tell thread to terminate */
1437         if (timer_thread) {
1438                 int rc = WaitForSingleObject(timer_thread, 1000);
1439                 if (rc == WAIT_TIMEOUT)
1440                         error("timer thread did not terminate timely");
1441                 else if (rc != WAIT_OBJECT_0)
1442                         error("waiting for timer thread failed: %lu",
1443                               GetLastError());
1444                 CloseHandle(timer_thread);
1445         }
1446         if (timer_event)
1447                 CloseHandle(timer_event);
1448         timer_event = NULL;
1449         timer_thread = NULL;
1450 }
1451
1452 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1453 {
1454         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1455 }
1456
1457 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1458 {
1459         static const struct timeval zero;
1460         static int atexit_done;
1461
1462         if (out != NULL)
1463                 return errno = EINVAL,
1464                         error("setitimer param 3 != NULL not implemented");
1465         if (!is_timeval_eq(&in->it_interval, &zero) &&
1466             !is_timeval_eq(&in->it_interval, &in->it_value))
1467                 return errno = EINVAL,
1468                         error("setitimer: it_interval must be zero or eq it_value");
1469
1470         if (timer_thread)
1471                 stop_timer_thread();
1472
1473         if (is_timeval_eq(&in->it_value, &zero) &&
1474             is_timeval_eq(&in->it_interval, &zero))
1475                 return 0;
1476
1477         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1478         one_shot = is_timeval_eq(&in->it_interval, &zero);
1479         if (!atexit_done) {
1480                 atexit(stop_timer_thread);
1481                 atexit_done = 1;
1482         }
1483         return start_timer_thread();
1484 }
1485
1486 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1487 {
1488         if (sig != SIGALRM)
1489                 return errno = EINVAL,
1490                         error("sigaction only implemented for SIGALRM");
1491         if (out != NULL)
1492                 return errno = EINVAL,
1493                         error("sigaction: param 3 != NULL not implemented");
1494
1495         timer_fn = in->sa_handler;
1496         return 0;
1497 }
1498
1499 #undef signal
1500 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1501 {
1502         sig_handler_t old = timer_fn;
1503         if (sig != SIGALRM)
1504                 return signal(sig, handler);
1505         timer_fn = handler;
1506         return old;
1507 }
1508
1509 static const char *make_backslash_path(const char *path)
1510 {
1511         static char buf[PATH_MAX + 1];
1512         char *c;
1513
1514         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1515                 die("Too long path: %.*s", 60, path);
1516
1517         for (c = buf; *c; c++) {
1518                 if (*c == '/')
1519                         *c = '\\';
1520         }
1521         return buf;
1522 }
1523
1524 void mingw_open_html(const char *unixpath)
1525 {
1526         const char *htmlpath = make_backslash_path(unixpath);
1527         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1528                         const char *, const char *, const char *, INT);
1529         T ShellExecute;
1530         HMODULE shell32;
1531
1532         shell32 = LoadLibrary("shell32.dll");
1533         if (!shell32)
1534                 die("cannot load shell32.dll");
1535         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1536         if (!ShellExecute)
1537                 die("cannot run browser");
1538
1539         printf("Launching default browser to display HTML ...\n");
1540         ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1541
1542         FreeLibrary(shell32);
1543 }
1544
1545 int link(const char *oldpath, const char *newpath)
1546 {
1547         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1548         static T create_hard_link = NULL;
1549         if (!create_hard_link) {
1550                 create_hard_link = (T) GetProcAddress(
1551                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1552                 if (!create_hard_link)
1553                         create_hard_link = (T)-1;
1554         }
1555         if (create_hard_link == (T)-1) {
1556                 errno = ENOSYS;
1557                 return -1;
1558         }
1559         if (!create_hard_link(newpath, oldpath, NULL)) {
1560                 errno = err_win_to_posix(GetLastError());
1561                 return -1;
1562         }
1563         return 0;
1564 }
1565
1566 char *getpass(const char *prompt)
1567 {
1568         struct strbuf buf = STRBUF_INIT;
1569
1570         fputs(prompt, stderr);
1571         for (;;) {
1572                 char c = _getch();
1573                 if (c == '\r' || c == '\n')
1574                         break;
1575                 strbuf_addch(&buf, c);
1576         }
1577         fputs("\n", stderr);
1578         return strbuf_detach(&buf, NULL);
1579 }
1580
1581 #ifndef NO_MINGW_REPLACE_READDIR
1582 /* MinGW readdir implementation to avoid extra lstats for Git */
1583 struct mingw_DIR
1584 {
1585         struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1586         struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1587         long                    dd_handle;      /* _findnext handle */
1588         int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1589         char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1590 };
1591
1592 struct dirent *mingw_readdir(DIR *dir)
1593 {
1594         WIN32_FIND_DATAA buf;
1595         HANDLE handle;
1596         struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1597
1598         if (!dir->dd_handle) {
1599                 errno = EBADF; /* No set_errno for mingw */
1600                 return NULL;
1601         }
1602
1603         if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1604         {
1605                 DWORD lasterr;
1606                 handle = FindFirstFileA(dir->dd_name, &buf);
1607                 lasterr = GetLastError();
1608                 dir->dd_handle = (long)handle;
1609                 if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1610                         errno = err_win_to_posix(lasterr);
1611                         return NULL;
1612                 }
1613         } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1614                 return NULL;
1615         } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1616                 DWORD lasterr = GetLastError();
1617                 FindClose((HANDLE)dir->dd_handle);
1618                 dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1619                 /* POSIX says you shouldn't set errno when readdir can't
1620                    find any more files; so, if another error we leave it set. */
1621                 if (lasterr != ERROR_NO_MORE_FILES)
1622                         errno = err_win_to_posix(lasterr);
1623                 return NULL;
1624         }
1625
1626         /* We get here if `buf' contains valid data.  */
1627         strcpy(dir->dd_dir.d_name, buf.cFileName);
1628         ++dir->dd_stat;
1629
1630         /* Set file type, based on WIN32_FIND_DATA */
1631         mdir->dd_dir.d_type = 0;
1632         if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1633                 mdir->dd_dir.d_type |= DT_DIR;
1634         else
1635                 mdir->dd_dir.d_type |= DT_REG;
1636
1637         return (struct dirent*)&dir->dd_dir;
1638 }
1639 #endif // !NO_MINGW_REPLACE_READDIR