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 && !is_bare_repository() &&
 136             make_hidden(dir))
 137                 warning("Failed to make '%s' hidden", dir);
 138         git_config_set("core.hideDotFiles",
 139                 hide_dotfiles == HIDE_DOTFILES_FALSE ? "false" :
 140                 (hide_dotfiles == HIDE_DOTFILES_DOTGITONLY ?
 141                  "dotGitOnly" : "true"));
 142 }
 143
 144 #undef mkdir
 145 int mingw_mkdir(const char *path, int mode)
 146 {
 147         int ret = mkdir(path);
 148         if (!ret && hide_dotfiles == HIDE_DOTFILES_TRUE) {
 149                 /*
 150                  * In Windows a file or dir starting with a dot is not
 151                  * automatically hidden. So lets mark it as hidden when
 152                  * such a directory is created.
 153                  */
 154                 const char *start = basename((char*)path);
 155                 if (*start == '.')
 156                         return make_hidden(path);
 157         }
 158         return ret;
 159 }
 160
 161 static int ask_user_yes_no(const char *format, ...)
 162 {
 163         char answer[5];
 164         char question[4096];
 165         const char *retry_hook[] = { NULL, NULL, NULL };
 166         va_list args;
 167
 168         if ((retry_hook[0] = getenv("GIT_ASK_YESNO"))) {
 169
 170                 va_start(args, format);
 171                 vsnprintf(question, sizeof(question), format, args);
 172                 va_end(args);
 173
 174                 retry_hook[1] = question;
 175                 return !run_command_v_opt(retry_hook, 0);
 176         }
 177
 178         if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
 179                 return 0;
 180
 181         while (1) {
 182                 va_start(args, format);
 183                 vfprintf(stderr, format, args);
 184                 va_end(args);
 185                 fprintf(stderr, " (y/n)? ");
 186
 187                 if (fgets(answer, sizeof(answer), stdin)) {
 188                         /* remove the newline */
 189                         if (answer[strlen(answer)-2] == '\r')
 190                                 answer[strlen(answer)-2] = '\0';
 191                         if (answer[strlen(answer)-1] == '\n')
 192                                 answer[strlen(answer)-1] = '\0';
 193                 } else
 194                         return 0;
 195
 196                 if (answer[0] == 'y' && strlen(answer) == 1)
 197                         return 1;
 198                 if (!strncasecmp(answer, "yes", sizeof(answer)))
 199                         return 1;
 200                 if (answer[0] == 'n' && strlen(answer) == 1)
 201                         return 0;
 202                 if (!strncasecmp(answer, "no", sizeof(answer)))
 203                         return 0;
 204                 fprintf(stderr, "I did not understand your answer: '%s'\n",
 205                                 answer);
 206         }
 207 }
 208
 209 #undef unlink
 210 int mingw_unlink(const char *pathname)
 211 {
 212         int ret, tries = 0;
 213
 214         /* read-only files cannot be removed */
 215         chmod(pathname, 0666);
 216         while ((ret = unlink(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 217                 if (errno != EACCES)
 218                         break;
 219                 /*
 220                  * We assume that some other process had the source or
 221                  * destination file open at the wrong moment and retry.
 222                  * In order to give the other process a higher chance to
 223                  * complete its operation, we give up our time slice now.
 224                  * If we have to retry again, we do sleep a bit.
 225                  */
 226                 Sleep(delay[tries]);
 227                 tries++;
 228         }
 229         while (ret == -1 && errno == EACCES &&
 230                ask_user_yes_no("Unlink of file '%s' failed. "
 231                         "Should I try again?", pathname))
 232                ret = unlink(pathname);
 233         return ret;
 234 }
 235
 236 static int is_dir_empty(const char *path)
 237 {
 238         struct strbuf buf = STRBUF_INIT;
 239         WIN32_FIND_DATAA findbuf;
 240         HANDLE handle;
 241
 242         strbuf_addf(&buf, "%s\\*", path);
 243         handle = FindFirstFileA(buf.buf, &findbuf);
 244         if (handle == INVALID_HANDLE_VALUE) {
 245                 strbuf_release(&buf);
 246                 return GetLastError() == ERROR_NO_MORE_FILES;
 247         }
 248
 249         while (!strcmp(findbuf.cFileName, ".") ||
 250                         !strcmp(findbuf.cFileName, ".."))
 251                 if (!FindNextFile(handle, &findbuf)) {
 252                         strbuf_release(&buf);
 253                         return GetLastError() == ERROR_NO_MORE_FILES;
 254                 }
 255         FindClose(handle);
 256         strbuf_release(&buf);
 257         return 0;
 258 }
 259
 260 #undef rmdir
 261 int mingw_rmdir(const char *pathname)
 262 {
 263         int ret, tries = 0;
 264
 265         while ((ret = rmdir(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 266                 if (errno != EACCES)
 267                         break;
 268                 if (!is_dir_empty(pathname)) {
 269                         errno = ENOTEMPTY;
 270                         break;
 271                 }
 272                 /*
 273                  * We assume that some other process had the source or
 274                  * destination file open at the wrong moment and retry.
 275                  * In order to give the other process a higher chance to
 276                  * complete its operation, we give up our time slice now.
 277                  * If we have to retry again, we do sleep a bit.
 278                  */
 279                 Sleep(delay[tries]);
 280                 tries++;
 281         }
 282         while (ret == -1 && errno == EACCES &&
 283                ask_user_yes_no("Deletion of directory '%s' failed. "
 284                         "Should I try again?", pathname))
 285                ret = rmdir(pathname);
 286         return ret;
 287 }
 288
 289 #undef open
 290 int mingw_open (const char *filename, int oflags, ...)
 291 {
 292         va_list args;
 293         unsigned mode;
 294         int fd;
 295
 296         va_start(args, oflags);
 297         mode = va_arg(args, int);
 298         va_end(args);
 299
 300         if (!strcmp(filename, "/dev/null"))
 301                 filename = "nul";
 302
 303         fd = open(filename, oflags, mode);
 304
 305         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 306                 DWORD attrs = GetFileAttributes(filename);
 307                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 308                         errno = EISDIR;
 309         }
 310         if ((oflags & O_CREAT) && fd >= 0 &&
 311             hide_dotfiles == HIDE_DOTFILES_TRUE) {
 312                 /*
 313                  * In Windows a file or dir starting with a dot is not
 314                  * automatically hidden. So lets mark it as hidden when
 315                  * such a file is created.
 316                  */
 317                 const char *start = basename((char*)filename);
 318                 if (*start == '.' && make_hidden(filename))
 319                         warning("Could not mark '%s' as hidden.", filename);
 320         }
 321         return fd;
 322 }
 323
 324 #undef fopen
 325 FILE *mingw_fopen (const char *filename, const char *otype)
 326 {
 327         int hide = 0;
 328         FILE *file;
 329         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 330             basename((char*)filename)[0] == '.')
 331                 hide = access(filename, F_OK);
 332         if (!strcmp(filename, "/dev/null"))
 333                 filename = "nul";
 334         file = fopen(filename, otype);
 335         if (file && hide && make_hidden(filename))
 336                 warning("Could not mark '%s' as hidden.", filename);
 337         return file;
 338 }
 339
 340 #undef freopen
 341 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 342 {
 343         int hide = 0;
 344         FILE *file;
 345         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 346             basename((char*)filename)[0] == '.')
 347                 hide = access(filename, F_OK);
 348         if (filename && !strcmp(filename, "/dev/null"))
 349                 filename = "nul";
 350         file = freopen(filename, otype, stream);
 351         if (file && hide && make_hidden(filename))
 352                 warning("Could not mark '%s' as hidden.", filename);
 353         return file;
 354 }
 355
 356 /*
 357  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 358  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 359  */
 360 static inline long long filetime_to_hnsec(const FILETIME *ft)
 361 {
 362         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 363         /* Windows to Unix Epoch conversion */
 364         return winTime - 116444736000000000LL;
 365 }
 366
 367 static inline time_t filetime_to_time_t(const FILETIME *ft)
 368 {
 369         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 370 }
 371
 372 /* We keep the do_lstat code in a separate function to avoid recursion.
 373  * When a path ends with a slash, the stat will fail with ENOENT. In
 374  * this case, we strip the trailing slashes and stat again.
 375  *
 376  * If follow is true then act like stat() and report on the link
 377  * target. Otherwise report on the link itself.
 378  */
 379 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 380 {
 381         WIN32_FILE_ATTRIBUTE_DATA fdata;
 382
 383         if (!(errno = get_file_attr(file_name, &fdata))) {
 384                 buf->st_ino = 0;
 385                 buf->st_gid = 0;
 386                 buf->st_uid = 0;
 387                 buf->st_nlink = 1;
 388                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 389                 buf->st_size = fdata.nFileSizeLow |
 390                         (((off_t)fdata.nFileSizeHigh)<<32);
 391                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 392                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 393                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 394                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 395                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 396                         WIN32_FIND_DATAA findbuf;
 397                         HANDLE handle = FindFirstFileA(file_name, &findbuf);
 398                         if (handle != INVALID_HANDLE_VALUE) {
 399                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 400                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 401                                         if (follow) {
 402                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 403                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 404                                         } else {
 405                                                 buf->st_mode = S_IFLNK;
 406                                         }
 407                                         buf->st_mode |= S_IREAD;
 408                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 409                                                 buf->st_mode |= S_IWRITE;
 410                                 }
 411                                 FindClose(handle);
 412                         }
 413                 }
 414                 return 0;
 415         }
 416         return -1;
 417 }
 418
 419 /* We provide our own lstat/fstat functions, since the provided
 420  * lstat/fstat functions are so slow. These stat functions are
 421  * tailored for Git's usage (read: fast), and are not meant to be
 422  * complete. Note that Git stat()s are redirected to mingw_lstat()
 423  * too, since Windows doesn't really handle symlinks that well.
 424  */
 425 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 426 {
 427         int namelen;
 428         static char alt_name[PATH_MAX];
 429
 430         if (!do_lstat(follow, file_name, buf))
 431                 return 0;
 432
 433         /* if file_name ended in a '/', Windows returned ENOENT;
 434          * try again without trailing slashes
 435          */
 436         if (errno != ENOENT)
 437                 return -1;
 438
 439         namelen = strlen(file_name);
 440         if (namelen && file_name[namelen-1] != '/')
 441                 return -1;
 442         while (namelen && file_name[namelen-1] == '/')
 443                 --namelen;
 444         if (!namelen || namelen >= PATH_MAX)
 445                 return -1;
 446
 447         memcpy(alt_name, file_name, namelen);
 448         alt_name[namelen] = 0;
 449         return do_lstat(follow, alt_name, buf);
 450 }
 451
 452 int mingw_lstat(const char *file_name, struct stat *buf)
 453 {
 454         return do_stat_internal(0, file_name, buf);
 455 }
 456 int mingw_stat(const char *file_name, struct stat *buf)
 457 {
 458         return do_stat_internal(1, file_name, buf);
 459 }
 460
 461 #undef fstat
 462 int mingw_fstat(int fd, struct stat *buf)
 463 {
 464         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 465         BY_HANDLE_FILE_INFORMATION fdata;
 466
 467         if (fh == INVALID_HANDLE_VALUE) {
 468                 errno = EBADF;
 469                 return -1;
 470         }
 471         /* direct non-file handles to MS's fstat() */
 472         if (GetFileType(fh) != FILE_TYPE_DISK)
 473                 return _fstati64(fd, buf);
 474
 475         if (GetFileInformationByHandle(fh, &fdata)) {
 476                 buf->st_ino = 0;
 477                 buf->st_gid = 0;
 478                 buf->st_uid = 0;
 479                 buf->st_nlink = 1;
 480                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 481                 buf->st_size = fdata.nFileSizeLow |
 482                         (((off_t)fdata.nFileSizeHigh)<<32);
 483                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 484                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 485                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 486                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 487                 return 0;
 488         }
 489         errno = EBADF;
 490         return -1;
 491 }
 492
 493 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 494 {
 495         long long winTime = t * 10000000LL + 116444736000000000LL;
 496         ft->dwLowDateTime = winTime;
 497         ft->dwHighDateTime = winTime >> 32;
 498 }
 499
 500 int mingw_utime (const char *file_name, const struct utimbuf *times)
 501 {
 502         FILETIME mft, aft;
 503         int fh, rc;
 504
 505         /* must have write permission */
 506         DWORD attrs = GetFileAttributes(file_name);
 507         if (attrs != INVALID_FILE_ATTRIBUTES &&
 508             (attrs & FILE_ATTRIBUTE_READONLY)) {
 509                 /* ignore errors here; open() will report them */
 510                 SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 511         }
 512
 513         if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 514                 rc = -1;
 515                 goto revert_attrs;
 516         }
 517
 518         time_t_to_filetime(times->modtime, &mft);
 519         time_t_to_filetime(times->actime, &aft);
 520         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 521                 errno = EINVAL;
 522                 rc = -1;
 523         } else
 524                 rc = 0;
 525         close(fh);
 526
 527 revert_attrs:
 528         if (attrs != INVALID_FILE_ATTRIBUTES &&
 529             (attrs & FILE_ATTRIBUTE_READONLY)) {
 530                 /* ignore errors again */
 531                 SetFileAttributes(file_name, attrs);
 532         }
 533         return rc;
 534 }
 535
 536 unsigned int sleep (unsigned int seconds)
 537 {
 538         Sleep(seconds*1000);
 539         return 0;
 540 }
 541
 542 int mkstemp(char *template)
 543 {
 544         char *filename = mktemp(template);
 545         if (filename == NULL)
 546                 return -1;
 547         return open(filename, O_RDWR | O_CREAT, 0600);
 548 }
 549
 550 int gettimeofday(struct timeval *tv, void *tz)
 551 {
 552         FILETIME ft;
 553         long long hnsec;
 554
 555         GetSystemTimeAsFileTime(&ft);
 556         hnsec = filetime_to_hnsec(&ft);
 557         tv->tv_sec = hnsec / 10000000;
 558         tv->tv_usec = (hnsec % 10000000) / 10;
 559         return 0;
 560 }
 561
 562 int pipe(int filedes[2])
 563 {
 564         HANDLE h[2];
 565
 566         /* this creates non-inheritable handles */
 567         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 568                 errno = err_win_to_posix(GetLastError());
 569                 return -1;
 570         }
 571         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 572         if (filedes[0] < 0) {
 573                 CloseHandle(h[0]);
 574                 CloseHandle(h[1]);
 575                 return -1;
 576         }
 577         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 578         if (filedes[0] < 0) {
 579                 close(filedes[0]);
 580                 CloseHandle(h[1]);
 581                 return -1;
 582         }
 583         return 0;
 584 }
 585
 586 int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 587 {
 588         int i, pending;
 589
 590         if (timeout >= 0) {
 591                 if (nfds == 0) {
 592                         Sleep(timeout);
 593                         return 0;
 594                 }
 595                 return errno = EINVAL, error("poll timeout not supported");
 596         }
 597
 598         /* When there is only one fd to wait for, then we pretend that
 599          * input is available and let the actual wait happen when the
 600          * caller invokes read().
 601          */
 602         if (nfds == 1) {
 603                 if (!(ufds[0].events & POLLIN))
 604                         return errno = EINVAL, error("POLLIN not set");
 605                 ufds[0].revents = POLLIN;
 606                 return 0;
 607         }
 608
 609 repeat:
 610         pending = 0;
 611         for (i = 0; i < nfds; i++) {
 612                 DWORD avail = 0;
 613                 HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 614                 if (h == INVALID_HANDLE_VALUE)
 615                         return -1;      /* errno was set */
 616
 617                 if (!(ufds[i].events & POLLIN))
 618                         return errno = EINVAL, error("POLLIN not set");
 619
 620                 /* this emulation works only for pipes */
 621                 if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 622                         int err = GetLastError();
 623                         if (err == ERROR_BROKEN_PIPE) {
 624                                 ufds[i].revents = POLLHUP;
 625                                 pending++;
 626                         } else {
 627                                 errno = EINVAL;
 628                                 return error("PeekNamedPipe failed,"
 629                                         " GetLastError: %u", err);
 630                         }
 631                 } else if (avail) {
 632                         ufds[i].revents = POLLIN;
 633                         pending++;
 634                 } else
 635                         ufds[i].revents = 0;
 636         }
 637         if (!pending) {
 638                 /* The only times that we spin here is when the process
 639                  * that is connected through the pipes is waiting for
 640                  * its own input data to become available. But since
 641                  * the process (pack-objects) is itself CPU intensive,
 642                  * it will happily pick up the time slice that we are
 643                  * relinquishing here.
 644                  */
 645                 Sleep(0);
 646                 goto repeat;
 647         }
 648         return 0;
 649 }
 650
 651 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 652 {
 653         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 654         memcpy(result, gmtime(timep), sizeof(struct tm));
 655         return result;
 656 }
 657
 658 struct tm *localtime_r(const time_t *timep, struct tm *result)
 659 {
 660         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 661         memcpy(result, localtime(timep), sizeof(struct tm));
 662         return result;
 663 }
 664
 665 #undef getcwd
 666 char *mingw_getcwd(char *pointer, int len)
 667 {
 668         int i;
 669         char *ret = getcwd(pointer, len);
 670         if (!ret)
 671                 return ret;
 672         for (i = 0; pointer[i]; i++)
 673                 if (pointer[i] == '\\')
 674                         pointer[i] = '/';
 675         return ret;
 676 }
 677
 678 #undef getenv
 679 char *mingw_getenv(const char *name)
 680 {
 681         char *result = getenv(name);
 682         if (!result && !strcmp(name, "TMPDIR")) {
 683                 /* on Windows it is TMP and TEMP */
 684                 result = getenv("TMP");
 685                 if (!result)
 686                         result = getenv("TEMP");
 687         }
 688         return result;
 689 }
 690
 691 /*
 692  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 693  * (Parsing C++ Command-Line Arguments)
 694  */
 695 static const char *quote_arg(const char *arg)
 696 {
 697         /* count chars to quote */
 698         int len = 0, n = 0;
 699         int force_quotes = 0;
 700         char *q, *d;
 701         const char *p = arg;
 702         if (!*p) force_quotes = 1;
 703         while (*p) {
 704                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 705                         force_quotes = 1;
 706                 else if (*p == '"')
 707                         n++;
 708                 else if (*p == '\\') {
 709                         int count = 0;
 710                         while (*p == '\\') {
 711                                 count++;
 712                                 p++;
 713                                 len++;
 714                         }
 715                         if (*p == '"')
 716                                 n += count*2 + 1;
 717                         continue;
 718                 }
 719                 len++;
 720                 p++;
 721         }
 722         if (!force_quotes && n == 0)
 723                 return arg;
 724
 725         /* insert \ where necessary */
 726         d = q = xmalloc(len+n+3);
 727         *d++ = '"';
 728         while (*arg) {
 729                 if (*arg == '"')
 730                         *d++ = '\\';
 731                 else if (*arg == '\\') {
 732                         int count = 0;
 733                         while (*arg == '\\') {
 734                                 count++;
 735                                 *d++ = *arg++;
 736                         }
 737                         if (*arg == '"') {
 738                                 while (count-- > 0)
 739                                         *d++ = '\\';
 740                                 *d++ = '\\';
 741                         }
 742                 }
 743                 *d++ = *arg++;
 744         }
 745         *d++ = '"';
 746         *d++ = 0;
 747         return q;
 748 }
 749
 750 static const char *parse_interpreter(const char *cmd)
 751 {
 752         static char buf[100];
 753         char *p, *opt;
 754         int n, fd;
 755
 756         /* don't even try a .exe */
 757         n = strlen(cmd);
 758         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 759                 return NULL;
 760
 761         fd = open(cmd, O_RDONLY);
 762         if (fd < 0)
 763                 return NULL;
 764         n = read(fd, buf, sizeof(buf)-1);
 765         close(fd);
 766         if (n < 4)      /* at least '#!/x' and not error */
 767                 return NULL;
 768
 769         if (buf[0] != '#' || buf[1] != '!')
 770                 return NULL;
 771         buf[n] = '\0';
 772         p = buf + strcspn(buf, "\r\n");
 773         if (!*p)
 774                 return NULL;
 775
 776         *p = '\0';
 777         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 778                 return NULL;
 779         /* strip options */
 780         if ((opt = strchr(p+1, ' ')))
 781                 *opt = '\0';
 782         return p+1;
 783 }
 784
 785 /*
 786  * Splits the PATH into parts.
 787  */
 788 static char **get_path_split(void)
 789 {
 790         char *p, **path, *envpath = getenv("PATH");
 791         int i, n = 0;
 792
 793         if (!envpath || !*envpath)
 794                 return NULL;
 795
 796         envpath = xstrdup(envpath);
 797         p = envpath;
 798         while (p) {
 799                 char *dir = p;
 800                 p = strchr(p, ';');
 801                 if (p) *p++ = '\0';
 802                 if (*dir) {     /* not earlier, catches series of ; */
 803                         ++n;
 804                 }
 805         }
 806         if (!n)
 807                 return NULL;
 808
 809         path = xmalloc((n+1)*sizeof(char *));
 810         p = envpath;
 811         i = 0;
 812         do {
 813                 if (*p)
 814                         path[i++] = xstrdup(p);
 815                 p = p+strlen(p)+1;
 816         } while (i < n);
 817         path[i] = NULL;
 818
 819         free(envpath);
 820
 821         return path;
 822 }
 823
 824 static void free_path_split(char **path)
 825 {
 826         char **p = path;
 827
 828         if (!path)
 829                 return;
 830
 831         while (*p)
 832                 free(*p++);
 833         free(path);
 834 }
 835
 836 /*
 837  * exe_only means that we only want to detect .exe files, but not scripts
 838  * (which do not have an extension)
 839  */
 840 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 841 {
 842         char path[MAX_PATH];
 843         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 844
 845         if (!isexe && access(path, F_OK) == 0)
 846                 return xstrdup(path);
 847         path[strlen(path)-4] = '\0';
 848         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 849                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 850                         return xstrdup(path);
 851         return NULL;
 852 }
 853
 854 /*
 855  * Determines the absolute path of cmd using the the split path in path.
 856  * If cmd contains a slash or backslash, no lookup is performed.
 857  */
 858 static char *path_lookup(const char *cmd, char **path, int exe_only)
 859 {
 860         char *prog = NULL;
 861         int len = strlen(cmd);
 862         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 863
 864         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 865                 prog = xstrdup(cmd);
 866
 867         while (!prog && *path)
 868                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 869
 870         return prog;
 871 }
 872
 873 static int env_compare(const void *a, const void *b)
 874 {
 875         char *const *ea = a;
 876         char *const *eb = b;
 877         return strcasecmp(*ea, *eb);
 878 }
 879
 880 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 881                               const char *dir,
 882                               int prepend_cmd, int fhin, int fhout, int fherr)
 883 {
 884         STARTUPINFO si;
 885         PROCESS_INFORMATION pi;
 886         struct strbuf envblk, args;
 887         unsigned flags;
 888         BOOL ret;
 889
 890         /* Determine whether or not we are associated to a console */
 891         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 892                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 893                         FILE_ATTRIBUTE_NORMAL, NULL);
 894         if (cons == INVALID_HANDLE_VALUE) {
 895                 /* There is no console associated with this process.
 896                  * Since the child is a console process, Windows
 897                  * would normally create a console window. But
 898                  * since we'll be redirecting std streams, we do
 899                  * not need the console.
 900                  * It is necessary to use DETACHED_PROCESS
 901                  * instead of CREATE_NO_WINDOW to make ssh
 902                  * recognize that it has no console.
 903                  */
 904                 flags = DETACHED_PROCESS;
 905         } else {
 906                 /* There is already a console. If we specified
 907                  * DETACHED_PROCESS here, too, Windows would
 908                  * disassociate the child from the console.
 909                  * The same is true for CREATE_NO_WINDOW.
 910                  * Go figure!
 911                  */
 912                 flags = 0;
 913                 CloseHandle(cons);
 914         }
 915         memset(&si, 0, sizeof(si));
 916         si.cb = sizeof(si);
 917         si.dwFlags = STARTF_USESTDHANDLES;
 918         si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 919         si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 920         si.hStdError = (HANDLE) _get_osfhandle(fherr);
 921
 922         /* concatenate argv, quoting args as we go */
 923         strbuf_init(&args, 0);
 924         if (prepend_cmd) {
 925                 char *quoted = (char *)quote_arg(cmd);
 926                 strbuf_addstr(&args, quoted);
 927                 if (quoted != cmd)
 928                         free(quoted);
 929         }
 930         for (; *argv; argv++) {
 931                 char *quoted = (char *)quote_arg(*argv);
 932                 if (*args.buf)
 933                         strbuf_addch(&args, ' ');
 934                 strbuf_addstr(&args, quoted);
 935                 if (quoted != *argv)
 936                         free(quoted);
 937         }
 938
 939         if (env) {
 940                 int count = 0;
 941                 char **e, **sorted_env;
 942
 943                 for (e = env; *e; e++)
 944                         count++;
 945
 946                 /* environment must be sorted */
 947                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 948                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 949                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 950
 951                 strbuf_init(&envblk, 0);
 952                 for (e = sorted_env; *e; e++) {
 953                         strbuf_addstr(&envblk, *e);
 954                         strbuf_addch(&envblk, '\0');
 955                 }
 956                 free(sorted_env);
 957         }
 958
 959         memset(&pi, 0, sizeof(pi));
 960         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 961                 env ? envblk.buf : NULL, dir, &si, &pi);
 962
 963         if (env)
 964                 strbuf_release(&envblk);
 965         strbuf_release(&args);
 966
 967         if (!ret) {
 968                 errno = ENOENT;
 969                 return -1;
 970         }
 971         CloseHandle(pi.hThread);
 972         return (pid_t)pi.hProcess;
 973 }
 974
 975 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 976                            int prepend_cmd)
 977 {
 978         return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 979 }
 980
 981 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 982                      const char *dir,
 983                      int fhin, int fhout, int fherr)
 984 {
 985         pid_t pid;
 986         char **path = get_path_split();
 987         char *prog = path_lookup(cmd, path, 0);
 988
 989         if (!prog) {
 990                 errno = ENOENT;
 991                 pid = -1;
 992         }
 993         else {
 994                 const char *interpr = parse_interpreter(prog);
 995
 996                 if (interpr) {
 997                         const char *argv0 = argv[0];
 998                         char *iprog = path_lookup(interpr, path, 1);
 999                         argv[0] = prog;
1000                         if (!iprog) {
1001                                 errno = ENOENT;
1002                                 pid = -1;
1003                         }
1004                         else {
1005                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
1006                                                        fhin, fhout, fherr);
1007                                 free(iprog);
1008                         }
1009                         argv[0] = argv0;
1010                 }
1011                 else
1012                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
1013                                                fhin, fhout, fherr);
1014                 free(prog);
1015         }
1016         free_path_split(path);
1017         return pid;
1018 }
1019
1020 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
1021 {
1022         const char *interpr = parse_interpreter(cmd);
1023         char **path;
1024         char *prog;
1025         int pid = 0;
1026
1027         if (!interpr)
1028                 return 0;
1029         path = get_path_split();
1030         prog = path_lookup(interpr, path, 1);
1031         if (prog) {
1032                 int argc = 0;
1033                 const char **argv2;
1034                 while (argv[argc]) argc++;
1035                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1036                 argv2[0] = (char *)cmd; /* full path to the script file */
1037                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1038                 pid = mingw_spawnve(prog, argv2, env, 1);
1039                 if (pid >= 0) {
1040                         int status;
1041                         if (waitpid(pid, &status, 0) < 0)
1042                                 status = 255;
1043                         exit(status);
1044                 }
1045                 pid = 1;        /* indicate that we tried but failed */
1046                 free(prog);
1047                 free(argv2);
1048         }
1049         free_path_split(path);
1050         return pid;
1051 }
1052
1053 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
1054 {
1055         /* check if git_command is a shell script */
1056         if (!try_shell_exec(cmd, argv, (char **)env)) {
1057                 int pid, status;
1058
1059                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
1060                 if (pid < 0)
1061                         return;
1062                 if (waitpid(pid, &status, 0) < 0)
1063                         status = 255;
1064                 exit(status);
1065         }
1066 }
1067
1068 void mingw_execvp(const char *cmd, char *const *argv)
1069 {
1070         char **path = get_path_split();
1071         char *prog = path_lookup(cmd, path, 0);
1072
1073         if (prog) {
1074                 mingw_execve(prog, argv, environ);
1075                 free(prog);
1076         } else
1077                 errno = ENOENT;
1078
1079         free_path_split(path);
1080 }
1081
1082 static char **copy_environ(void)
1083 {
1084         char **env;
1085         int i = 0;
1086         while (environ[i])
1087                 i++;
1088         env = xmalloc((i+1)*sizeof(*env));
1089         for (i = 0; environ[i]; i++)
1090                 env[i] = xstrdup(environ[i]);
1091         env[i] = NULL;
1092         return env;
1093 }
1094
1095 void free_environ(char **env)
1096 {
1097         int i;
1098         for (i = 0; env[i]; i++)
1099                 free(env[i]);
1100         free(env);
1101 }
1102
1103 static int lookup_env(char **env, const char *name, size_t nmln)
1104 {
1105         int i;
1106
1107         for (i = 0; env[i]; i++) {
1108                 if (0 == strncmp(env[i], name, nmln)
1109                     && '=' == env[i][nmln])
1110                         /* matches */
1111                         return i;
1112         }
1113         return -1;
1114 }
1115
1116 /*
1117  * If name contains '=', then sets the variable, otherwise it unsets it
1118  */
1119 static char **env_setenv(char **env, const char *name)
1120 {
1121         char *eq = strchrnul(name, '=');
1122         int i = lookup_env(env, name, eq-name);
1123
1124         if (i < 0) {
1125                 if (*eq) {
1126                         for (i = 0; env[i]; i++)
1127                                 ;
1128                         env = xrealloc(env, (i+2)*sizeof(*env));
1129                         env[i] = xstrdup(name);
1130                         env[i+1] = NULL;
1131                 }
1132         }
1133         else {
1134                 free(env[i]);
1135                 if (*eq)
1136                         env[i] = xstrdup(name);
1137                 else
1138                         for (; env[i]; i++)
1139                                 env[i] = env[i+1];
1140         }
1141         return env;
1142 }
1143
1144 /*
1145  * Copies global environ and adjusts variables as specified by vars.
1146  */
1147 char **make_augmented_environ(const char *const *vars)
1148 {
1149         char **env = copy_environ();
1150
1151         while (*vars)
1152                 env = env_setenv(env, *vars++);
1153         return env;
1154 }
1155
1156 /*
1157  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1158  * that service contains a numerical port, or that it it is null. It
1159  * does a simple search using gethostbyname, and returns one IPv4 host
1160  * if one was found.
1161  */
1162 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1163                                    const struct addrinfo *hints,
1164                                    struct addrinfo **res)
1165 {
1166         struct hostent *h = gethostbyname(node);
1167         struct addrinfo *ai;
1168         struct sockaddr_in *sin;
1169
1170         if (!h)
1171                 return WSAGetLastError();
1172
1173         ai = xmalloc(sizeof(struct addrinfo));
1174         *res = ai;
1175         ai->ai_flags = 0;
1176         ai->ai_family = AF_INET;
1177         ai->ai_socktype = hints->ai_socktype;
1178         switch (hints->ai_socktype) {
1179         case SOCK_STREAM:
1180                 ai->ai_protocol = IPPROTO_TCP;
1181                 break;
1182         case SOCK_DGRAM:
1183                 ai->ai_protocol = IPPROTO_UDP;
1184                 break;
1185         default:
1186                 ai->ai_protocol = 0;
1187                 break;
1188         }
1189         ai->ai_addrlen = sizeof(struct sockaddr_in);
1190         ai->ai_canonname = strdup(h->h_name);
1191
1192         sin = xmalloc(ai->ai_addrlen);
1193         memset(sin, 0, ai->ai_addrlen);
1194         sin->sin_family = AF_INET;
1195         if (service)
1196                 sin->sin_port = htons(atoi(service));
1197         sin->sin_addr = *(struct in_addr *)h->h_addr;
1198         ai->ai_addr = (struct sockaddr *)sin;
1199         ai->ai_next = 0;
1200         return 0;
1201 }
1202
1203 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1204 {
1205         free(res->ai_canonname);
1206         free(res->ai_addr);
1207         free(res);
1208 }
1209
1210 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1211                                    char *host, DWORD hostlen,
1212                                    char *serv, DWORD servlen, int flags)
1213 {
1214         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1215         if (sa->sa_family != AF_INET)
1216                 return EAI_FAMILY;
1217         if (!host && !serv)
1218                 return EAI_NONAME;
1219
1220         if (host && hostlen > 0) {
1221                 struct hostent *ent = NULL;
1222                 if (!(flags & NI_NUMERICHOST))
1223                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1224                                             sizeof(sin->sin_addr), AF_INET);
1225
1226                 if (ent)
1227                         snprintf(host, hostlen, "%s", ent->h_name);
1228                 else if (flags & NI_NAMEREQD)
1229                         return EAI_NONAME;
1230                 else
1231                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1232         }
1233
1234         if (serv && servlen > 0) {
1235                 struct servent *ent = NULL;
1236                 if (!(flags & NI_NUMERICSERV))
1237                         ent = getservbyport(sin->sin_port,
1238                                             flags & NI_DGRAM ? "udp" : "tcp");
1239
1240                 if (ent)
1241                         snprintf(serv, servlen, "%s", ent->s_name);
1242                 else
1243                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1244         }
1245
1246         return 0;
1247 }
1248
1249 static HMODULE ipv6_dll = NULL;
1250 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1251 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1252                                       const struct addrinfo *hints,
1253                                       struct addrinfo **res);
1254 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1255                                       char *host, DWORD hostlen,
1256                                       char *serv, DWORD servlen, int flags);
1257 /*
1258  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1259  * don't need to try to load that one dynamically.
1260  */
1261
1262 static void socket_cleanup(void)
1263 {
1264         WSACleanup();
1265         if (ipv6_dll)
1266                 FreeLibrary(ipv6_dll);
1267         ipv6_dll = NULL;
1268         ipv6_freeaddrinfo = freeaddrinfo_stub;
1269         ipv6_getaddrinfo = getaddrinfo_stub;
1270         ipv6_getnameinfo = getnameinfo_stub;
1271 }
1272
1273 static void ensure_socket_initialization(void)
1274 {
1275         WSADATA wsa;
1276         static int initialized = 0;
1277         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1278         const char **name;
1279
1280         if (initialized)
1281                 return;
1282
1283         if (WSAStartup(MAKEWORD(2,2), &wsa))
1284                 die("unable to initialize winsock subsystem, error %d",
1285                         WSAGetLastError());
1286
1287         for (name = libraries; *name; name++) {
1288                 ipv6_dll = LoadLibrary(*name);
1289                 if (!ipv6_dll)
1290                         continue;
1291
1292                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1293                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1294                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1295                                                    const struct addrinfo *,
1296                                                    struct addrinfo **))
1297                         GetProcAddress(ipv6_dll, "getaddrinfo");
1298                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1299                                                    socklen_t, char *, DWORD,
1300                                                    char *, DWORD, int))
1301                         GetProcAddress(ipv6_dll, "getnameinfo");
1302                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1303                         FreeLibrary(ipv6_dll);
1304                         ipv6_dll = NULL;
1305                 } else
1306                         break;
1307         }
1308         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1309                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1310                 ipv6_getaddrinfo = getaddrinfo_stub;
1311                 ipv6_getnameinfo = getnameinfo_stub;
1312         }
1313
1314         atexit(socket_cleanup);
1315         initialized = 1;
1316 }
1317
1318 #undef gethostbyname
1319 struct hostent *mingw_gethostbyname(const char *host)
1320 {
1321         ensure_socket_initialization();
1322         return gethostbyname(host);
1323 }
1324
1325 void mingw_freeaddrinfo(struct addrinfo *res)
1326 {
1327         ipv6_freeaddrinfo(res);
1328 }
1329
1330 int mingw_getaddrinfo(const char *node, const char *service,
1331                       const struct addrinfo *hints, struct addrinfo **res)
1332 {
1333         ensure_socket_initialization();
1334         return ipv6_getaddrinfo(node, service, hints, res);
1335 }
1336
1337 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1338                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1339                       int flags)
1340 {
1341         ensure_socket_initialization();
1342         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1343 }
1344
1345 int mingw_socket(int domain, int type, int protocol)
1346 {
1347         int sockfd;
1348         SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
1349         if (s == INVALID_SOCKET) {
1350                 /*
1351                  * WSAGetLastError() values are regular BSD error codes
1352                  * biased by WSABASEERR.
1353                  * However, strerror() does not know about networking
1354                  * specific errors, which are values beginning at 38 or so.
1355                  * Therefore, we choose to leave the biased error code
1356                  * in errno so that _if_ someone looks up the code somewhere,
1357                  * then it is at least the number that are usually listed.
1358                  */
1359                 errno = WSAGetLastError();
1360                 return -1;
1361         }
1362         /* convert into a file descriptor */
1363         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1364                 closesocket(s);
1365                 return error("unable to make a socket file descriptor: %s",
1366                         strerror(errno));
1367         }
1368         return sockfd;
1369 }
1370
1371 #undef connect
1372 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1373 {
1374         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1375         return connect(s, sa, sz);
1376 }
1377
1378 #undef rename
1379 int mingw_rename(const char *pold, const char *pnew)
1380 {
1381         DWORD attrs, gle;
1382         int tries = 0;
1383
1384         /*
1385          * Try native rename() first to get errno right.
1386          * It is based on MoveFile(), which cannot overwrite existing files.
1387          */
1388         if (!rename(pold, pnew))
1389                 return 0;
1390         if (errno != EEXIST)
1391                 return -1;
1392 repeat:
1393         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1394                 return 0;
1395         /* TODO: translate more errors */
1396         gle = GetLastError();
1397         if (gle == ERROR_ACCESS_DENIED &&
1398             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1399                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1400                         errno = EISDIR;
1401                         return -1;
1402                 }
1403                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1404                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1405                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1406                                 return 0;
1407                         gle = GetLastError();
1408                         /* revert file attributes on failure */
1409                         SetFileAttributes(pnew, attrs);
1410                 }
1411         }
1412         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1413                 /*
1414                  * We assume that some other process had the source or
1415                  * destination file open at the wrong moment and retry.
1416                  * In order to give the other process a higher chance to
1417                  * complete its operation, we give up our time slice now.
1418                  * If we have to retry again, we do sleep a bit.
1419                  */
1420                 Sleep(delay[tries]);
1421                 tries++;
1422                 goto repeat;
1423         }
1424         if (gle == ERROR_ACCESS_DENIED &&
1425                ask_user_yes_no("Rename from '%s' to '%s' failed. "
1426                        "Should I try again?", pold, pnew))
1427                 goto repeat;
1428
1429         errno = EACCES;
1430         return -1;
1431 }
1432
1433 /*
1434  * Note that this doesn't return the actual pagesize, but
1435  * the allocation granularity. If future Windows specific git code
1436  * needs the real getpagesize function, we need to find another solution.
1437  */
1438 int mingw_getpagesize(void)
1439 {
1440         SYSTEM_INFO si;
1441         GetSystemInfo(&si);
1442         return si.dwAllocationGranularity;
1443 }
1444
1445 struct passwd *getpwuid(int uid)
1446 {
1447         static char user_name[100];
1448         static struct passwd p;
1449
1450         DWORD len = sizeof(user_name);
1451         if (!GetUserName(user_name, &len))
1452                 return NULL;
1453         p.pw_name = user_name;
1454         p.pw_gecos = "unknown";
1455         p.pw_dir = NULL;
1456         return &p;
1457 }
1458
1459 static HANDLE timer_event;
1460 static HANDLE timer_thread;
1461 static int timer_interval;
1462 static int one_shot;
1463 static sig_handler_t timer_fn = SIG_DFL;
1464
1465 /* The timer works like this:
1466  * The thread, ticktack(), is a trivial routine that most of the time
1467  * only waits to receive the signal to terminate. The main thread tells
1468  * the thread to terminate by setting the timer_event to the signalled
1469  * state.
1470  * But ticktack() interrupts the wait state after the timer's interval
1471  * length to call the signal handler.
1472  */
1473
1474 static unsigned __stdcall ticktack(void *dummy)
1475 {
1476         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1477                 if (timer_fn == SIG_DFL)
1478                         die("Alarm");
1479                 if (timer_fn != SIG_IGN)
1480                         timer_fn(SIGALRM);
1481                 if (one_shot)
1482                         break;
1483         }
1484         return 0;
1485 }
1486
1487 static int start_timer_thread(void)
1488 {
1489         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1490         if (timer_event) {
1491                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1492                 if (!timer_thread )
1493                         return errno = ENOMEM,
1494                                 error("cannot start timer thread");
1495         } else
1496                 return errno = ENOMEM,
1497                         error("cannot allocate resources for timer");
1498         return 0;
1499 }
1500
1501 static void stop_timer_thread(void)
1502 {
1503         if (timer_event)
1504                 SetEvent(timer_event);  /* tell thread to terminate */
1505         if (timer_thread) {
1506                 int rc = WaitForSingleObject(timer_thread, 1000);
1507                 if (rc == WAIT_TIMEOUT)
1508                         error("timer thread did not terminate timely");
1509                 else if (rc != WAIT_OBJECT_0)
1510                         error("waiting for timer thread failed: %lu",
1511                               GetLastError());
1512                 CloseHandle(timer_thread);
1513         }
1514         if (timer_event)
1515                 CloseHandle(timer_event);
1516         timer_event = NULL;
1517         timer_thread = NULL;
1518 }
1519
1520 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1521 {
1522         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1523 }
1524
1525 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1526 {
1527         static const struct timeval zero;
1528         static int atexit_done;
1529
1530         if (out != NULL)
1531                 return errno = EINVAL,
1532                         error("setitimer param 3 != NULL not implemented");
1533         if (!is_timeval_eq(&in->it_interval, &zero) &&
1534             !is_timeval_eq(&in->it_interval, &in->it_value))
1535                 return errno = EINVAL,
1536                         error("setitimer: it_interval must be zero or eq it_value");
1537
1538         if (timer_thread)
1539                 stop_timer_thread();
1540
1541         if (is_timeval_eq(&in->it_value, &zero) &&
1542             is_timeval_eq(&in->it_interval, &zero))
1543                 return 0;
1544
1545         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1546         one_shot = is_timeval_eq(&in->it_interval, &zero);
1547         if (!atexit_done) {
1548                 atexit(stop_timer_thread);
1549                 atexit_done = 1;
1550         }
1551         return start_timer_thread();
1552 }
1553
1554 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1555 {
1556         if (sig != SIGALRM)
1557                 return errno = EINVAL,
1558                         error("sigaction only implemented for SIGALRM");
1559         if (out != NULL)
1560                 return errno = EINVAL,
1561                         error("sigaction: param 3 != NULL not implemented");
1562
1563         timer_fn = in->sa_handler;
1564         return 0;
1565 }
1566
1567 #undef signal
1568 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1569 {
1570         sig_handler_t old = timer_fn;
1571         if (sig != SIGALRM)
1572                 return signal(sig, handler);
1573         timer_fn = handler;
1574         return old;
1575 }
1576
1577 static const char *make_backslash_path(const char *path)
1578 {
1579         static char buf[PATH_MAX + 1];
1580         char *c;
1581
1582         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1583                 die("Too long path: %.*s", 60, path);
1584
1585         for (c = buf; *c; c++) {
1586                 if (*c == '/')
1587                         *c = '\\';
1588         }
1589         return buf;
1590 }
1591
1592 void mingw_open_html(const char *unixpath)
1593 {
1594         const char *htmlpath = make_backslash_path(unixpath);
1595         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1596                         const char *, const char *, const char *, INT);
1597         T ShellExecute;
1598         HMODULE shell32;
1599         int r;
1600
1601         shell32 = LoadLibrary("shell32.dll");
1602         if (!shell32)
1603                 die("cannot load shell32.dll");
1604         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1605         if (!ShellExecute)
1606                 die("cannot run browser");
1607
1608         printf("Launching default browser to display HTML ...\n");
1609         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1610         FreeLibrary(shell32);
1611         /* see the MSDN documentation referring to the result codes here */
1612         if (r <= 32) {
1613                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1614         }
1615 }
1616
1617 int link(const char *oldpath, const char *newpath)
1618 {
1619         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1620         static T create_hard_link = NULL;
1621         if (!create_hard_link) {
1622                 create_hard_link = (T) GetProcAddress(
1623                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1624                 if (!create_hard_link)
1625                         create_hard_link = (T)-1;
1626         }
1627         if (create_hard_link == (T)-1) {
1628                 errno = ENOSYS;
1629                 return -1;
1630         }
1631         if (!create_hard_link(newpath, oldpath, NULL)) {
1632                 errno = err_win_to_posix(GetLastError());
1633                 return -1;
1634         }
1635         return 0;
1636 }
1637
1638 char *getpass(const char *prompt)
1639 {
1640         struct strbuf buf = STRBUF_INIT;
1641
1642         fputs(prompt, stderr);
1643         for (;;) {
1644                 char c = _getch();
1645                 if (c == '\r' || c == '\n')
1646                         break;
1647                 strbuf_addch(&buf, c);
1648         }
1649         fputs("\n", stderr);
1650         return strbuf_detach(&buf, NULL);
1651 }
1652
1653 #ifndef NO_MINGW_REPLACE_READDIR
1654 /* MinGW readdir implementation to avoid extra lstats for Git */
1655 struct mingw_DIR
1656 {
1657         struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1658         struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1659         long                    dd_handle;      /* _findnext handle */
1660         int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1661         char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1662 };
1663
1664 struct dirent *mingw_readdir(DIR *dir)
1665 {
1666         WIN32_FIND_DATAA buf;
1667         HANDLE handle;
1668         struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1669
1670         if (!dir->dd_handle) {
1671                 errno = EBADF; /* No set_errno for mingw */
1672                 return NULL;
1673         }
1674
1675         if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1676         {
1677                 DWORD lasterr;
1678                 handle = FindFirstFileA(dir->dd_name, &buf);
1679                 lasterr = GetLastError();
1680                 dir->dd_handle = (long)handle;
1681                 if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1682                         errno = err_win_to_posix(lasterr);
1683                         return NULL;
1684                 }
1685         } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1686                 return NULL;
1687         } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1688                 DWORD lasterr = GetLastError();
1689                 FindClose((HANDLE)dir->dd_handle);
1690                 dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1691                 /* POSIX says you shouldn't set errno when readdir can't
1692                    find any more files; so, if another error we leave it set. */
1693                 if (lasterr != ERROR_NO_MORE_FILES)
1694                         errno = err_win_to_posix(lasterr);
1695                 return NULL;
1696         }
1697
1698         /* We get here if `buf' contains valid data.  */
1699         strcpy(dir->dd_dir.d_name, buf.cFileName);
1700         ++dir->dd_stat;
1701
1702         /* Set file type, based on WIN32_FIND_DATA */
1703         mdir->dd_dir.d_type = 0;
1704         if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1705                 mdir->dd_dir.d_type |= DT_DIR;
1706         else
1707                 mdir->dd_dir.d_type |= DT_REG;
1708
1709         return (struct dirent*)&dir->dd_dir;
1710 }
1711 #endif // !NO_MINGW_REPLACE_READDIR
1712
1713 const char *get_windows_home_directory()
1714 {
1715         static const char *home_directory = NULL;
1716         struct strbuf buf = STRBUF_INIT;
1717
1718         if (home_directory)
1719                 return home_directory;
1720
1721         home_directory = getenv("HOME");
1722         if (home_directory && *home_directory)
1723                 return home_directory;
1724
1725         strbuf_addf(&buf, "%s/%s", getenv("HOMEDRIVE"), getenv("HOMEPATH"));
1726         home_directory = strbuf_detach(&buf, NULL);
1727
1728         return home_directory;
1729 }