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 (filename && !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 write
 325 ssize_t mingw_write(int fd, const void *buf, size_t count)
 326 {
 327         /*
 328          * While write() calls to a file on a local disk are translated
 329          * into WriteFile() calls with a maximum size of 64KB on Windows
 330          * XP and 256KB on Vista, no such cap is placed on writes to
 331          * files over the network on Windows XP.  Unfortunately, there
 332          * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 333          * bigger writes fail on Windows XP.
 334          * So we cap to a nice 31MB here to avoid write failures over
 335          * the net without changing the number of WriteFile() calls in
 336          * the local case.
 337          */
 338         return write(fd, buf, min(count, 31 * 1024 * 1024));
 339 }
 340
 341 #undef fopen
 342 FILE *mingw_fopen (const char *filename, const char *otype)
 343 {
 344         int hide = 0;
 345         FILE *file;
 346         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 347             basename((char*)filename)[0] == '.')
 348                 hide = access(filename, F_OK);
 349         if (filename && !strcmp(filename, "/dev/null"))
 350                 filename = "nul";
 351         file = fopen(filename, otype);
 352         if (file && hide && make_hidden(filename))
 353                 warning("Could not mark '%s' as hidden.", filename);
 354         return file;
 355 }
 356
 357 #undef freopen
 358 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 359 {
 360         int hide = 0;
 361         FILE *file;
 362         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 363             basename((char*)filename)[0] == '.')
 364                 hide = access(filename, F_OK);
 365         if (filename && !strcmp(filename, "/dev/null"))
 366                 filename = "nul";
 367         file = freopen(filename, otype, stream);
 368         if (file && hide && make_hidden(filename))
 369                 warning("Could not mark '%s' as hidden.", filename);
 370         return file;
 371 }
 372
 373 /*
 374  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 375  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 376  */
 377 static inline long long filetime_to_hnsec(const FILETIME *ft)
 378 {
 379         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 380         /* Windows to Unix Epoch conversion */
 381         return winTime - 116444736000000000LL;
 382 }
 383
 384 static inline time_t filetime_to_time_t(const FILETIME *ft)
 385 {
 386         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 387 }
 388
 389 /* We keep the do_lstat code in a separate function to avoid recursion.
 390  * When a path ends with a slash, the stat will fail with ENOENT. In
 391  * this case, we strip the trailing slashes and stat again.
 392  *
 393  * If follow is true then act like stat() and report on the link
 394  * target. Otherwise report on the link itself.
 395  */
 396 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 397 {
 398         int err;
 399         WIN32_FILE_ATTRIBUTE_DATA fdata;
 400
 401         if (!(err = get_file_attr(file_name, &fdata))) {
 402                 buf->st_ino = 0;
 403                 buf->st_gid = 0;
 404                 buf->st_uid = 0;
 405                 buf->st_nlink = 1;
 406                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 407                 buf->st_size = fdata.nFileSizeLow |
 408                         (((off_t)fdata.nFileSizeHigh)<<32);
 409                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 410                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 411                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 412                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 413                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 414                         WIN32_FIND_DATAA findbuf;
 415                         HANDLE handle = FindFirstFileA(file_name, &findbuf);
 416                         if (handle != INVALID_HANDLE_VALUE) {
 417                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 418                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 419                                         if (follow) {
 420                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 421                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 422                                         } else {
 423                                                 buf->st_mode = S_IFLNK;
 424                                         }
 425                                         buf->st_mode |= S_IREAD;
 426                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 427                                                 buf->st_mode |= S_IWRITE;
 428                                 }
 429                                 FindClose(handle);
 430                         }
 431                 }
 432                 return 0;
 433         }
 434         errno = err;
 435         return -1;
 436 }
 437
 438 /* We provide our own lstat/fstat functions, since the provided
 439  * lstat/fstat functions are so slow. These stat functions are
 440  * tailored for Git's usage (read: fast), and are not meant to be
 441  * complete. Note that Git stat()s are redirected to mingw_lstat()
 442  * too, since Windows doesn't really handle symlinks that well.
 443  */
 444 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 445 {
 446         int namelen;
 447         static char alt_name[PATH_MAX];
 448
 449         if (!do_lstat(follow, file_name, buf))
 450                 return 0;
 451
 452         /* if file_name ended in a '/', Windows returned ENOENT;
 453          * try again without trailing slashes
 454          */
 455         if (errno != ENOENT)
 456                 return -1;
 457
 458         namelen = strlen(file_name);
 459         if (namelen && file_name[namelen-1] != '/')
 460                 return -1;
 461         while (namelen && file_name[namelen-1] == '/')
 462                 --namelen;
 463         if (!namelen || namelen >= PATH_MAX)
 464                 return -1;
 465
 466         memcpy(alt_name, file_name, namelen);
 467         alt_name[namelen] = 0;
 468         return do_lstat(follow, alt_name, buf);
 469 }
 470
 471 int mingw_lstat(const char *file_name, struct stat *buf)
 472 {
 473         return do_stat_internal(0, file_name, buf);
 474 }
 475 int mingw_stat(const char *file_name, struct stat *buf)
 476 {
 477         return do_stat_internal(1, file_name, buf);
 478 }
 479
 480 #undef fstat
 481 int mingw_fstat(int fd, struct stat *buf)
 482 {
 483         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 484         BY_HANDLE_FILE_INFORMATION fdata;
 485
 486         if (fh == INVALID_HANDLE_VALUE) {
 487                 errno = EBADF;
 488                 return -1;
 489         }
 490         /* direct non-file handles to MS's fstat() */
 491         if (GetFileType(fh) != FILE_TYPE_DISK)
 492                 return _fstati64(fd, buf);
 493
 494         if (GetFileInformationByHandle(fh, &fdata)) {
 495                 buf->st_ino = 0;
 496                 buf->st_gid = 0;
 497                 buf->st_uid = 0;
 498                 buf->st_nlink = 1;
 499                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 500                 buf->st_size = fdata.nFileSizeLow |
 501                         (((off_t)fdata.nFileSizeHigh)<<32);
 502                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 503                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 504                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 505                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 506                 return 0;
 507         }
 508         errno = EBADF;
 509         return -1;
 510 }
 511
 512 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 513 {
 514         long long winTime = t * 10000000LL + 116444736000000000LL;
 515         ft->dwLowDateTime = winTime;
 516         ft->dwHighDateTime = winTime >> 32;
 517 }
 518
 519 int mingw_utime (const char *file_name, const struct utimbuf *times)
 520 {
 521         FILETIME mft, aft;
 522         int fh, rc;
 523
 524         /* must have write permission */
 525         DWORD attrs = GetFileAttributes(file_name);
 526         if (attrs != INVALID_FILE_ATTRIBUTES &&
 527             (attrs & FILE_ATTRIBUTE_READONLY)) {
 528                 /* ignore errors here; open() will report them */
 529                 SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 530         }
 531
 532         if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 533                 rc = -1;
 534                 goto revert_attrs;
 535         }
 536
 537         if (times) {
 538                 time_t_to_filetime(times->modtime, &mft);
 539                 time_t_to_filetime(times->actime, &aft);
 540         } else {
 541                 GetSystemTimeAsFileTime(&mft);
 542                 aft = mft;
 543         }
 544         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 545                 errno = EINVAL;
 546                 rc = -1;
 547         } else
 548                 rc = 0;
 549         close(fh);
 550
 551 revert_attrs:
 552         if (attrs != INVALID_FILE_ATTRIBUTES &&
 553             (attrs & FILE_ATTRIBUTE_READONLY)) {
 554                 /* ignore errors again */
 555                 SetFileAttributes(file_name, attrs);
 556         }
 557         return rc;
 558 }
 559
 560 unsigned int sleep (unsigned int seconds)
 561 {
 562         Sleep(seconds*1000);
 563         return 0;
 564 }
 565
 566 int mkstemp(char *template)
 567 {
 568         char *filename = mktemp(template);
 569         if (filename == NULL)
 570                 return -1;
 571         return open(filename, O_RDWR | O_CREAT, 0600);
 572 }
 573
 574 int gettimeofday(struct timeval *tv, void *tz)
 575 {
 576         FILETIME ft;
 577         long long hnsec;
 578
 579         GetSystemTimeAsFileTime(&ft);
 580         hnsec = filetime_to_hnsec(&ft);
 581         tv->tv_sec = hnsec / 10000000;
 582         tv->tv_usec = (hnsec % 10000000) / 10;
 583         return 0;
 584 }
 585
 586 int pipe(int filedes[2])
 587 {
 588         HANDLE h[2];
 589
 590         /* this creates non-inheritable handles */
 591         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 592                 errno = err_win_to_posix(GetLastError());
 593                 return -1;
 594         }
 595         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 596         if (filedes[0] < 0) {
 597                 CloseHandle(h[0]);
 598                 CloseHandle(h[1]);
 599                 return -1;
 600         }
 601         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 602         if (filedes[0] < 0) {
 603                 close(filedes[0]);
 604                 CloseHandle(h[1]);
 605                 return -1;
 606         }
 607         return 0;
 608 }
 609
 610 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 611 {
 612         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 613         memcpy(result, gmtime(timep), sizeof(struct tm));
 614         return result;
 615 }
 616
 617 struct tm *localtime_r(const time_t *timep, struct tm *result)
 618 {
 619         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 620         memcpy(result, localtime(timep), sizeof(struct tm));
 621         return result;
 622 }
 623
 624 #undef getcwd
 625 char *mingw_getcwd(char *pointer, int len)
 626 {
 627         int i;
 628         char *ret = getcwd(pointer, len);
 629         if (!ret)
 630                 return ret;
 631         for (i = 0; pointer[i]; i++)
 632                 if (pointer[i] == '\\')
 633                         pointer[i] = '/';
 634         return ret;
 635 }
 636
 637 #undef getenv
 638 char *mingw_getenv(const char *name)
 639 {
 640         char *result = getenv(name);
 641         if (!result && !strcmp(name, "TMPDIR")) {
 642                 /* on Windows it is TMP and TEMP */
 643                 result = getenv("TMP");
 644                 if (!result)
 645                         result = getenv("TEMP");
 646         }
 647         return result;
 648 }
 649
 650 /*
 651  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 652  * (Parsing C++ Command-Line Arguments)
 653  */
 654 static const char *quote_arg(const char *arg)
 655 {
 656         /* count chars to quote */
 657         int len = 0, n = 0;
 658         int force_quotes = 0;
 659         char *q, *d;
 660         const char *p = arg;
 661         if (!*p) force_quotes = 1;
 662         while (*p) {
 663                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 664                         force_quotes = 1;
 665                 else if (*p == '"')
 666                         n++;
 667                 else if (*p == '\\') {
 668                         int count = 0;
 669                         while (*p == '\\') {
 670                                 count++;
 671                                 p++;
 672                                 len++;
 673                         }
 674                         if (*p == '"')
 675                                 n += count*2 + 1;
 676                         continue;
 677                 }
 678                 len++;
 679                 p++;
 680         }
 681         if (!force_quotes && n == 0)
 682                 return arg;
 683
 684         /* insert \ where necessary */
 685         d = q = xmalloc(len+n+3);
 686         *d++ = '"';
 687         while (*arg) {
 688                 if (*arg == '"')
 689                         *d++ = '\\';
 690                 else if (*arg == '\\') {
 691                         int count = 0;
 692                         while (*arg == '\\') {
 693                                 count++;
 694                                 *d++ = *arg++;
 695                         }
 696                         if (*arg == '"') {
 697                                 while (count-- > 0)
 698                                         *d++ = '\\';
 699                                 *d++ = '\\';
 700                         }
 701                 }
 702                 *d++ = *arg++;
 703         }
 704         *d++ = '"';
 705         *d++ = 0;
 706         return q;
 707 }
 708
 709 static const char *parse_interpreter(const char *cmd)
 710 {
 711         static char buf[100];
 712         char *p, *opt;
 713         int n, fd;
 714
 715         /* don't even try a .exe */
 716         n = strlen(cmd);
 717         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 718                 return NULL;
 719
 720         fd = open(cmd, O_RDONLY);
 721         if (fd < 0)
 722                 return NULL;
 723         n = read(fd, buf, sizeof(buf)-1);
 724         close(fd);
 725         if (n < 4)      /* at least '#!/x' and not error */
 726                 return NULL;
 727
 728         if (buf[0] != '#' || buf[1] != '!')
 729                 return NULL;
 730         buf[n] = '\0';
 731         p = buf + strcspn(buf, "\r\n");
 732         if (!*p)
 733                 return NULL;
 734
 735         *p = '\0';
 736         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 737                 return NULL;
 738         /* strip options */
 739         if ((opt = strchr(p+1, ' ')))
 740                 *opt = '\0';
 741         return p+1;
 742 }
 743
 744 /*
 745  * Splits the PATH into parts.
 746  */
 747 static char **get_path_split(void)
 748 {
 749         char *p, **path, *envpath = getenv("PATH");
 750         int i, n = 0;
 751
 752         if (!envpath || !*envpath)
 753                 return NULL;
 754
 755         envpath = xstrdup(envpath);
 756         p = envpath;
 757         while (p) {
 758                 char *dir = p;
 759                 p = strchr(p, ';');
 760                 if (p) *p++ = '\0';
 761                 if (*dir) {     /* not earlier, catches series of ; */
 762                         ++n;
 763                 }
 764         }
 765         if (!n)
 766                 return NULL;
 767
 768         path = xmalloc((n+1)*sizeof(char *));
 769         p = envpath;
 770         i = 0;
 771         do {
 772                 if (*p)
 773                         path[i++] = xstrdup(p);
 774                 p = p+strlen(p)+1;
 775         } while (i < n);
 776         path[i] = NULL;
 777
 778         free(envpath);
 779
 780         return path;
 781 }
 782
 783 static void free_path_split(char **path)
 784 {
 785         char **p = path;
 786
 787         if (!path)
 788                 return;
 789
 790         while (*p)
 791                 free(*p++);
 792         free(path);
 793 }
 794
 795 /*
 796  * exe_only means that we only want to detect .exe files, but not scripts
 797  * (which do not have an extension)
 798  */
 799 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 800 {
 801         char path[MAX_PATH];
 802         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 803
 804         if (!isexe && access(path, F_OK) == 0)
 805                 return xstrdup(path);
 806         path[strlen(path)-4] = '\0';
 807         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 808                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 809                         return xstrdup(path);
 810         return NULL;
 811 }
 812
 813 /*
 814  * Determines the absolute path of cmd using the split path in path.
 815  * If cmd contains a slash or backslash, no lookup is performed.
 816  */
 817 static char *path_lookup(const char *cmd, char **path, int exe_only)
 818 {
 819         char *prog = NULL;
 820         int len = strlen(cmd);
 821         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 822
 823         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 824                 prog = xstrdup(cmd);
 825
 826         while (!prog && *path)
 827                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 828
 829         return prog;
 830 }
 831
 832 static int env_compare(const void *a, const void *b)
 833 {
 834         char *const *ea = a;
 835         char *const *eb = b;
 836         return strcasecmp(*ea, *eb);
 837 }
 838
 839 struct pinfo_t {
 840         struct pinfo_t *next;
 841         pid_t pid;
 842         HANDLE proc;
 843 } pinfo_t;
 844 struct pinfo_t *pinfo = NULL;
 845 CRITICAL_SECTION pinfo_cs;
 846
 847 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 848                               const char *dir,
 849                               int prepend_cmd, int fhin, int fhout, int fherr)
 850 {
 851         STARTUPINFO si;
 852         PROCESS_INFORMATION pi;
 853         struct strbuf envblk, args;
 854         unsigned flags;
 855         BOOL ret;
 856
 857         /* Determine whether or not we are associated to a console */
 858         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 859                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 860                         FILE_ATTRIBUTE_NORMAL, NULL);
 861         if (cons == INVALID_HANDLE_VALUE) {
 862                 /* There is no console associated with this process.
 863                  * Since the child is a console process, Windows
 864                  * would normally create a console window. But
 865                  * since we'll be redirecting std streams, we do
 866                  * not need the console.
 867                  * It is necessary to use DETACHED_PROCESS
 868                  * instead of CREATE_NO_WINDOW to make ssh
 869                  * recognize that it has no console.
 870                  */
 871                 flags = DETACHED_PROCESS;
 872         } else {
 873                 /* There is already a console. If we specified
 874                  * DETACHED_PROCESS here, too, Windows would
 875                  * disassociate the child from the console.
 876                  * The same is true for CREATE_NO_WINDOW.
 877                  * Go figure!
 878                  */
 879                 flags = 0;
 880                 CloseHandle(cons);
 881         }
 882         memset(&si, 0, sizeof(si));
 883         si.cb = sizeof(si);
 884         si.dwFlags = STARTF_USESTDHANDLES;
 885         si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 886         si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 887         si.hStdError = (HANDLE) _get_osfhandle(fherr);
 888
 889         /* concatenate argv, quoting args as we go */
 890         strbuf_init(&args, 0);
 891         if (prepend_cmd) {
 892                 char *quoted = (char *)quote_arg(cmd);
 893                 strbuf_addstr(&args, quoted);
 894                 if (quoted != cmd)
 895                         free(quoted);
 896         }
 897         for (; *argv; argv++) {
 898                 char *quoted = (char *)quote_arg(*argv);
 899                 if (*args.buf)
 900                         strbuf_addch(&args, ' ');
 901                 strbuf_addstr(&args, quoted);
 902                 if (quoted != *argv)
 903                         free(quoted);
 904         }
 905
 906         if (env) {
 907                 int count = 0;
 908                 char **e, **sorted_env;
 909
 910                 for (e = env; *e; e++)
 911                         count++;
 912
 913                 /* environment must be sorted */
 914                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 915                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 916                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 917
 918                 strbuf_init(&envblk, 0);
 919                 for (e = sorted_env; *e; e++) {
 920                         strbuf_addstr(&envblk, *e);
 921                         strbuf_addch(&envblk, '\0');
 922                 }
 923                 free(sorted_env);
 924         }
 925
 926         memset(&pi, 0, sizeof(pi));
 927         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 928                 env ? envblk.buf : NULL, dir, &si, &pi);
 929
 930         if (env)
 931                 strbuf_release(&envblk);
 932         strbuf_release(&args);
 933
 934         if (!ret) {
 935                 errno = ENOENT;
 936                 return -1;
 937         }
 938         CloseHandle(pi.hThread);
 939
 940         /*
 941          * The process ID is the human-readable identifier of the process
 942          * that we want to present in log and error messages. The handle
 943          * is not useful for this purpose. But we cannot close it, either,
 944          * because it is not possible to turn a process ID into a process
 945          * handle after the process terminated.
 946          * Keep the handle in a list for waitpid.
 947          */
 948         EnterCriticalSection(&pinfo_cs);
 949         {
 950                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
 951                 info->pid = pi.dwProcessId;
 952                 info->proc = pi.hProcess;
 953                 info->next = pinfo;
 954                 pinfo = info;
 955         }
 956         LeaveCriticalSection(&pinfo_cs);
 957
 958         return (pid_t)pi.dwProcessId;
 959 }
 960
 961 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 962                            int prepend_cmd)
 963 {
 964         return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 965 }
 966
 967 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 968                      const char *dir,
 969                      int fhin, int fhout, int fherr)
 970 {
 971         pid_t pid;
 972         char **path = get_path_split();
 973         char *prog = path_lookup(cmd, path, 0);
 974
 975         if (!prog) {
 976                 errno = ENOENT;
 977                 pid = -1;
 978         }
 979         else {
 980                 const char *interpr = parse_interpreter(prog);
 981
 982                 if (interpr) {
 983                         const char *argv0 = argv[0];
 984                         char *iprog = path_lookup(interpr, path, 1);
 985                         argv[0] = prog;
 986                         if (!iprog) {
 987                                 errno = ENOENT;
 988                                 pid = -1;
 989                         }
 990                         else {
 991                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 992                                                        fhin, fhout, fherr);
 993                                 free(iprog);
 994                         }
 995                         argv[0] = argv0;
 996                 }
 997                 else
 998                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
 999                                                fhin, fhout, fherr);
1000                 free(prog);
1001         }
1002         free_path_split(path);
1003         return pid;
1004 }
1005
1006 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
1007 {
1008         const char *interpr = parse_interpreter(cmd);
1009         char **path;
1010         char *prog;
1011         int pid = 0;
1012
1013         if (!interpr)
1014                 return 0;
1015         path = get_path_split();
1016         prog = path_lookup(interpr, path, 1);
1017         if (prog) {
1018                 int argc = 0;
1019                 const char **argv2;
1020                 while (argv[argc]) argc++;
1021                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1022                 argv2[0] = (char *)cmd; /* full path to the script file */
1023                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1024                 pid = mingw_spawnve(prog, argv2, env, 1);
1025                 if (pid >= 0) {
1026                         int status;
1027                         if (waitpid(pid, &status, 0) < 0)
1028                                 status = 255;
1029                         exit(status);
1030                 }
1031                 pid = 1;        /* indicate that we tried but failed */
1032                 free(prog);
1033                 free(argv2);
1034         }
1035         free_path_split(path);
1036         return pid;
1037 }
1038
1039 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
1040 {
1041         /* check if git_command is a shell script */
1042         if (!try_shell_exec(cmd, argv, (char **)env)) {
1043                 int pid, status;
1044
1045                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
1046                 if (pid < 0)
1047                         return;
1048                 if (waitpid(pid, &status, 0) < 0)
1049                         status = 255;
1050                 exit(status);
1051         }
1052 }
1053
1054 void mingw_execvp(const char *cmd, char *const *argv)
1055 {
1056         char **path = get_path_split();
1057         char *prog = path_lookup(cmd, path, 0);
1058
1059         if (prog) {
1060                 mingw_execve(prog, argv, environ);
1061                 free(prog);
1062         } else
1063                 errno = ENOENT;
1064
1065         free_path_split(path);
1066 }
1067
1068 void mingw_execv(const char *cmd, char *const *argv)
1069 {
1070         mingw_execve(cmd, argv, environ);
1071 }
1072
1073 int mingw_kill(pid_t pid, int sig)
1074 {
1075         if (pid > 0 && sig == SIGTERM) {
1076                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1077
1078                 if (TerminateProcess(h, -1)) {
1079                         CloseHandle(h);
1080                         return 0;
1081                 }
1082
1083                 errno = err_win_to_posix(GetLastError());
1084                 CloseHandle(h);
1085                 return -1;
1086         }
1087
1088         errno = EINVAL;
1089         return -1;
1090 }
1091
1092 static char **copy_environ(void)
1093 {
1094         char **env;
1095         int i = 0;
1096         while (environ[i])
1097                 i++;
1098         env = xmalloc((i+1)*sizeof(*env));
1099         for (i = 0; environ[i]; i++)
1100                 env[i] = xstrdup(environ[i]);
1101         env[i] = NULL;
1102         return env;
1103 }
1104
1105 void free_environ(char **env)
1106 {
1107         int i;
1108         for (i = 0; env[i]; i++)
1109                 free(env[i]);
1110         free(env);
1111 }
1112
1113 static int lookup_env(char **env, const char *name, size_t nmln)
1114 {
1115         int i;
1116
1117         for (i = 0; env[i]; i++) {
1118                 if (0 == strncmp(env[i], name, nmln)
1119                     && '=' == env[i][nmln])
1120                         /* matches */
1121                         return i;
1122         }
1123         return -1;
1124 }
1125
1126 /*
1127  * If name contains '=', then sets the variable, otherwise it unsets it
1128  */
1129 static char **env_setenv(char **env, const char *name)
1130 {
1131         char *eq = strchrnul(name, '=');
1132         int i = lookup_env(env, name, eq-name);
1133
1134         if (i < 0) {
1135                 if (*eq) {
1136                         for (i = 0; env[i]; i++)
1137                                 ;
1138                         env = xrealloc(env, (i+2)*sizeof(*env));
1139                         env[i] = xstrdup(name);
1140                         env[i+1] = NULL;
1141                 }
1142         }
1143         else {
1144                 free(env[i]);
1145                 if (*eq)
1146                         env[i] = xstrdup(name);
1147                 else
1148                         for (; env[i]; i++)
1149                                 env[i] = env[i+1];
1150         }
1151         return env;
1152 }
1153
1154 /*
1155  * Copies global environ and adjusts variables as specified by vars.
1156  */
1157 char **make_augmented_environ(const char *const *vars)
1158 {
1159         char **env = copy_environ();
1160
1161         while (*vars)
1162                 env = env_setenv(env, *vars++);
1163         return env;
1164 }
1165
1166 /*
1167  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1168  * that service contains a numerical port, or that it it is null. It
1169  * does a simple search using gethostbyname, and returns one IPv4 host
1170  * if one was found.
1171  */
1172 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1173                                    const struct addrinfo *hints,
1174                                    struct addrinfo **res)
1175 {
1176         struct hostent *h = NULL;
1177         struct addrinfo *ai;
1178         struct sockaddr_in *sin;
1179
1180         if (node) {
1181                 h = gethostbyname(node);
1182                 if (!h)
1183                         return WSAGetLastError();
1184         }
1185
1186         ai = xmalloc(sizeof(struct addrinfo));
1187         *res = ai;
1188         ai->ai_flags = 0;
1189         ai->ai_family = AF_INET;
1190         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1191         switch (ai->ai_socktype) {
1192         case SOCK_STREAM:
1193                 ai->ai_protocol = IPPROTO_TCP;
1194                 break;
1195         case SOCK_DGRAM:
1196                 ai->ai_protocol = IPPROTO_UDP;
1197                 break;
1198         default:
1199                 ai->ai_protocol = 0;
1200                 break;
1201         }
1202         ai->ai_addrlen = sizeof(struct sockaddr_in);
1203         if (hints && (hints->ai_flags & AI_CANONNAME))
1204                 ai->ai_canonname = h ? strdup(h->h_name) : NULL;
1205         else
1206                 ai->ai_canonname = NULL;
1207
1208         sin = xmalloc(ai->ai_addrlen);
1209         memset(sin, 0, ai->ai_addrlen);
1210         sin->sin_family = AF_INET;
1211         /* Note: getaddrinfo is supposed to allow service to be a string,
1212          * which should be looked up using getservbyname. This is
1213          * currently not implemented */
1214         if (service)
1215                 sin->sin_port = htons(atoi(service));
1216         if (h)
1217                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1218         else if (hints && (hints->ai_flags & AI_PASSIVE))
1219                 sin->sin_addr.s_addr = INADDR_ANY;
1220         else
1221                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1222         ai->ai_addr = (struct sockaddr *)sin;
1223         ai->ai_next = 0;
1224         return 0;
1225 }
1226
1227 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1228 {
1229         free(res->ai_canonname);
1230         free(res->ai_addr);
1231         free(res);
1232 }
1233
1234 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1235                                    char *host, DWORD hostlen,
1236                                    char *serv, DWORD servlen, int flags)
1237 {
1238         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1239         if (sa->sa_family != AF_INET)
1240                 return EAI_FAMILY;
1241         if (!host && !serv)
1242                 return EAI_NONAME;
1243
1244         if (host && hostlen > 0) {
1245                 struct hostent *ent = NULL;
1246                 if (!(flags & NI_NUMERICHOST))
1247                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1248                                             sizeof(sin->sin_addr), AF_INET);
1249
1250                 if (ent)
1251                         snprintf(host, hostlen, "%s", ent->h_name);
1252                 else if (flags & NI_NAMEREQD)
1253                         return EAI_NONAME;
1254                 else
1255                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1256         }
1257
1258         if (serv && servlen > 0) {
1259                 struct servent *ent = NULL;
1260                 if (!(flags & NI_NUMERICSERV))
1261                         ent = getservbyport(sin->sin_port,
1262                                             flags & NI_DGRAM ? "udp" : "tcp");
1263
1264                 if (ent)
1265                         snprintf(serv, servlen, "%s", ent->s_name);
1266                 else
1267                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1268         }
1269
1270         return 0;
1271 }
1272
1273 static HMODULE ipv6_dll = NULL;
1274 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1275 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1276                                       const struct addrinfo *hints,
1277                                       struct addrinfo **res);
1278 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1279                                       char *host, DWORD hostlen,
1280                                       char *serv, DWORD servlen, int flags);
1281 /*
1282  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1283  * don't need to try to load that one dynamically.
1284  */
1285
1286 static void socket_cleanup(void)
1287 {
1288         WSACleanup();
1289         if (ipv6_dll)
1290                 FreeLibrary(ipv6_dll);
1291         ipv6_dll = NULL;
1292         ipv6_freeaddrinfo = freeaddrinfo_stub;
1293         ipv6_getaddrinfo = getaddrinfo_stub;
1294         ipv6_getnameinfo = getnameinfo_stub;
1295 }
1296
1297 static void ensure_socket_initialization(void)
1298 {
1299         WSADATA wsa;
1300         static int initialized = 0;
1301         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1302         const char **name;
1303
1304         if (initialized)
1305                 return;
1306
1307         if (WSAStartup(MAKEWORD(2,2), &wsa))
1308                 die("unable to initialize winsock subsystem, error %d",
1309                         WSAGetLastError());
1310
1311         for (name = libraries; *name; name++) {
1312                 ipv6_dll = LoadLibrary(*name);
1313                 if (!ipv6_dll)
1314                         continue;
1315
1316                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1317                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1318                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1319                                                    const struct addrinfo *,
1320                                                    struct addrinfo **))
1321                         GetProcAddress(ipv6_dll, "getaddrinfo");
1322                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1323                                                    socklen_t, char *, DWORD,
1324                                                    char *, DWORD, int))
1325                         GetProcAddress(ipv6_dll, "getnameinfo");
1326                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1327                         FreeLibrary(ipv6_dll);
1328                         ipv6_dll = NULL;
1329                 } else
1330                         break;
1331         }
1332         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1333                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1334                 ipv6_getaddrinfo = getaddrinfo_stub;
1335                 ipv6_getnameinfo = getnameinfo_stub;
1336         }
1337
1338         atexit(socket_cleanup);
1339         initialized = 1;
1340 }
1341
1342 #undef gethostbyname
1343 struct hostent *mingw_gethostbyname(const char *host)
1344 {
1345         ensure_socket_initialization();
1346         return gethostbyname(host);
1347 }
1348
1349 void mingw_freeaddrinfo(struct addrinfo *res)
1350 {
1351         ipv6_freeaddrinfo(res);
1352 }
1353
1354 int mingw_getaddrinfo(const char *node, const char *service,
1355                       const struct addrinfo *hints, struct addrinfo **res)
1356 {
1357         ensure_socket_initialization();
1358         return ipv6_getaddrinfo(node, service, hints, res);
1359 }
1360
1361 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1362                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1363                       int flags)
1364 {
1365         ensure_socket_initialization();
1366         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1367 }
1368
1369 int mingw_socket(int domain, int type, int protocol)
1370 {
1371         int sockfd;
1372         SOCKET s;
1373
1374         ensure_socket_initialization();
1375         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1376         if (s == INVALID_SOCKET) {
1377                 /*
1378                  * WSAGetLastError() values are regular BSD error codes
1379                  * biased by WSABASEERR.
1380                  * However, strerror() does not know about networking
1381                  * specific errors, which are values beginning at 38 or so.
1382                  * Therefore, we choose to leave the biased error code
1383                  * in errno so that _if_ someone looks up the code somewhere,
1384                  * then it is at least the number that are usually listed.
1385                  */
1386                 errno = WSAGetLastError();
1387                 return -1;
1388         }
1389         /* convert into a file descriptor */
1390         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1391                 closesocket(s);
1392                 return error("unable to make a socket file descriptor: %s",
1393                         strerror(errno));
1394         }
1395         return sockfd;
1396 }
1397
1398 #undef connect
1399 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1400 {
1401         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1402         return connect(s, sa, sz);
1403 }
1404
1405 #undef bind
1406 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1407 {
1408         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1409         return bind(s, sa, sz);
1410 }
1411
1412 #undef setsockopt
1413 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1414 {
1415         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1416         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1417 }
1418
1419 #undef listen
1420 int mingw_listen(int sockfd, int backlog)
1421 {
1422         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1423         return listen(s, backlog);
1424 }
1425
1426 #undef accept
1427 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1428 {
1429         int sockfd2;
1430
1431         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1432         SOCKET s2 = accept(s1, sa, sz);
1433
1434         /* convert into a file descriptor */
1435         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1436                 int err = errno;
1437                 closesocket(s2);
1438                 return error("unable to make a socket file descriptor: %s",
1439                         strerror(err));
1440         }
1441         return sockfd2;
1442 }
1443
1444 #undef rename
1445 int mingw_rename(const char *pold, const char *pnew)
1446 {
1447         DWORD attrs, gle;
1448         int tries = 0;
1449
1450         /*
1451          * Try native rename() first to get errno right.
1452          * It is based on MoveFile(), which cannot overwrite existing files.
1453          */
1454         if (!rename(pold, pnew))
1455                 return 0;
1456         if (errno != EEXIST)
1457                 return -1;
1458 repeat:
1459         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1460                 return 0;
1461         /* TODO: translate more errors */
1462         gle = GetLastError();
1463         if (gle == ERROR_ACCESS_DENIED &&
1464             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1465                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1466                         errno = EISDIR;
1467                         return -1;
1468                 }
1469                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1470                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1471                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1472                                 return 0;
1473                         gle = GetLastError();
1474                         /* revert file attributes on failure */
1475                         SetFileAttributes(pnew, attrs);
1476                 }
1477         }
1478         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1479                 /*
1480                  * We assume that some other process had the source or
1481                  * destination file open at the wrong moment and retry.
1482                  * In order to give the other process a higher chance to
1483                  * complete its operation, we give up our time slice now.
1484                  * If we have to retry again, we do sleep a bit.
1485                  */
1486                 Sleep(delay[tries]);
1487                 tries++;
1488                 goto repeat;
1489         }
1490         if (gle == ERROR_ACCESS_DENIED &&
1491                ask_user_yes_no("Rename from '%s' to '%s' failed. "
1492                        "Should I try again?", pold, pnew))
1493                 goto repeat;
1494
1495         errno = EACCES;
1496         return -1;
1497 }
1498
1499 /*
1500  * Note that this doesn't return the actual pagesize, but
1501  * the allocation granularity. If future Windows specific git code
1502  * needs the real getpagesize function, we need to find another solution.
1503  */
1504 int mingw_getpagesize(void)
1505 {
1506         SYSTEM_INFO si;
1507         GetSystemInfo(&si);
1508         return si.dwAllocationGranularity;
1509 }
1510
1511 struct passwd *getpwuid(int uid)
1512 {
1513         static char user_name[100];
1514         static struct passwd p;
1515
1516         DWORD len = sizeof(user_name);
1517         if (!GetUserName(user_name, &len))
1518                 return NULL;
1519         p.pw_name = user_name;
1520         p.pw_gecos = "unknown";
1521         p.pw_dir = NULL;
1522         return &p;
1523 }
1524
1525 static HANDLE timer_event;
1526 static HANDLE timer_thread;
1527 static int timer_interval;
1528 static int one_shot;
1529 static sig_handler_t timer_fn = SIG_DFL;
1530
1531 /* The timer works like this:
1532  * The thread, ticktack(), is a trivial routine that most of the time
1533  * only waits to receive the signal to terminate. The main thread tells
1534  * the thread to terminate by setting the timer_event to the signalled
1535  * state.
1536  * But ticktack() interrupts the wait state after the timer's interval
1537  * length to call the signal handler.
1538  */
1539
1540 static unsigned __stdcall ticktack(void *dummy)
1541 {
1542         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1543                 if (timer_fn == SIG_DFL)
1544                         die("Alarm");
1545                 if (timer_fn != SIG_IGN)
1546                         timer_fn(SIGALRM);
1547                 if (one_shot)
1548                         break;
1549         }
1550         return 0;
1551 }
1552
1553 static int start_timer_thread(void)
1554 {
1555         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1556         if (timer_event) {
1557                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1558                 if (!timer_thread )
1559                         return errno = ENOMEM,
1560                                 error("cannot start timer thread");
1561         } else
1562                 return errno = ENOMEM,
1563                         error("cannot allocate resources for timer");
1564         return 0;
1565 }
1566
1567 static void stop_timer_thread(void)
1568 {
1569         if (timer_event)
1570                 SetEvent(timer_event);  /* tell thread to terminate */
1571         if (timer_thread) {
1572                 int rc = WaitForSingleObject(timer_thread, 1000);
1573                 if (rc == WAIT_TIMEOUT)
1574                         error("timer thread did not terminate timely");
1575                 else if (rc != WAIT_OBJECT_0)
1576                         error("waiting for timer thread failed: %lu",
1577                               GetLastError());
1578                 CloseHandle(timer_thread);
1579         }
1580         if (timer_event)
1581                 CloseHandle(timer_event);
1582         timer_event = NULL;
1583         timer_thread = NULL;
1584 }
1585
1586 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1587 {
1588         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1589 }
1590
1591 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1592 {
1593         static const struct timeval zero;
1594         static int atexit_done;
1595
1596         if (out != NULL)
1597                 return errno = EINVAL,
1598                         error("setitimer param 3 != NULL not implemented");
1599         if (!is_timeval_eq(&in->it_interval, &zero) &&
1600             !is_timeval_eq(&in->it_interval, &in->it_value))
1601                 return errno = EINVAL,
1602                         error("setitimer: it_interval must be zero or eq it_value");
1603
1604         if (timer_thread)
1605                 stop_timer_thread();
1606
1607         if (is_timeval_eq(&in->it_value, &zero) &&
1608             is_timeval_eq(&in->it_interval, &zero))
1609                 return 0;
1610
1611         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1612         one_shot = is_timeval_eq(&in->it_interval, &zero);
1613         if (!atexit_done) {
1614                 atexit(stop_timer_thread);
1615                 atexit_done = 1;
1616         }
1617         return start_timer_thread();
1618 }
1619
1620 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1621 {
1622         if (sig != SIGALRM)
1623                 return errno = EINVAL,
1624                         error("sigaction only implemented for SIGALRM");
1625         if (out != NULL)
1626                 return errno = EINVAL,
1627                         error("sigaction: param 3 != NULL not implemented");
1628
1629         timer_fn = in->sa_handler;
1630         return 0;
1631 }
1632
1633 #undef signal
1634 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1635 {
1636         sig_handler_t old = timer_fn;
1637         if (sig != SIGALRM)
1638                 return signal(sig, handler);
1639         timer_fn = handler;
1640         return old;
1641 }
1642
1643 static const char *make_backslash_path(const char *path)
1644 {
1645         static char buf[PATH_MAX + 1];
1646         char *c;
1647
1648         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1649                 die("Too long path: %.*s", 60, path);
1650
1651         for (c = buf; *c; c++) {
1652                 if (*c == '/')
1653                         *c = '\\';
1654         }
1655         return buf;
1656 }
1657
1658 void mingw_open_html(const char *unixpath)
1659 {
1660         const char *htmlpath = make_backslash_path(unixpath);
1661         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1662                         const char *, const char *, const char *, INT);
1663         T ShellExecute;
1664         HMODULE shell32;
1665         int r;
1666
1667         shell32 = LoadLibrary("shell32.dll");
1668         if (!shell32)
1669                 die("cannot load shell32.dll");
1670         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1671         if (!ShellExecute)
1672                 die("cannot run browser");
1673
1674         printf("Launching default browser to display HTML ...\n");
1675         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1676         FreeLibrary(shell32);
1677         /* see the MSDN documentation referring to the result codes here */
1678         if (r <= 32) {
1679                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1680         }
1681 }
1682
1683 int link(const char *oldpath, const char *newpath)
1684 {
1685         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1686         static T create_hard_link = NULL;
1687         if (!create_hard_link) {
1688                 create_hard_link = (T) GetProcAddress(
1689                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1690                 if (!create_hard_link)
1691                         create_hard_link = (T)-1;
1692         }
1693         if (create_hard_link == (T)-1) {
1694                 errno = ENOSYS;
1695                 return -1;
1696         }
1697         if (!create_hard_link(newpath, oldpath, NULL)) {
1698                 errno = err_win_to_posix(GetLastError());
1699                 return -1;
1700         }
1701         return 0;
1702 }
1703
1704 char *getpass(const char *prompt)
1705 {
1706         struct strbuf buf = STRBUF_INIT;
1707
1708         fputs(prompt, stderr);
1709         for (;;) {
1710                 char c = _getch();
1711                 if (c == '\r' || c == '\n')
1712                         break;
1713                 strbuf_addch(&buf, c);
1714         }
1715         fputs("\n", stderr);
1716         return strbuf_detach(&buf, NULL);
1717 }
1718
1719 pid_t waitpid(pid_t pid, int *status, unsigned options)
1720 {
1721         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1722             FALSE, pid);
1723         if (!h) {
1724                 errno = ECHILD;
1725                 return -1;
1726         }
1727
1728         if (pid > 0 && options & WNOHANG) {
1729                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1730                         CloseHandle(h);
1731                         return 0;
1732                 }
1733                 options &= ~WNOHANG;
1734         }
1735
1736         if (options == 0) {
1737                 struct pinfo_t **ppinfo;
1738                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1739                         CloseHandle(h);
1740                         return 0;
1741                 }
1742
1743                 if (status)
1744                         GetExitCodeProcess(h, (LPDWORD)status);
1745
1746                 EnterCriticalSection(&pinfo_cs);
1747
1748                 ppinfo = &pinfo;
1749                 while (*ppinfo) {
1750                         struct pinfo_t *info = *ppinfo;
1751                         if (info->pid == pid) {
1752                                 CloseHandle(info->proc);
1753                                 *ppinfo = info->next;
1754                                 free(info);
1755                                 break;
1756                         }
1757                         ppinfo = &info->next;
1758                 }
1759
1760                 LeaveCriticalSection(&pinfo_cs);
1761
1762                 CloseHandle(h);
1763                 return pid;
1764         }
1765         CloseHandle(h);
1766
1767         errno = EINVAL;
1768         return -1;
1769 }
1770
1771 const char *get_windows_home_directory()
1772 {
1773         static const char *home_directory = NULL;
1774         struct strbuf buf = STRBUF_INIT;
1775
1776         if (home_directory)
1777                 return home_directory;
1778
1779         home_directory = getenv("HOME");
1780         if (home_directory && *home_directory)
1781                 return home_directory;
1782
1783         strbuf_addf(&buf, "%s/%s", getenv("HOMEDRIVE"), getenv("HOMEPATH"));
1784         home_directory = strbuf_detach(&buf, NULL);
1785
1786         return home_directory;
1787 }
1788
1789 int mingw_offset_1st_component(const char *path)
1790 {
1791         if (has_dos_drive_prefix(path))
1792                 return 2 + is_dir_sep(path[2]);
1793
1794         /* unc paths */
1795         if (is_dir_sep(path[0]) && is_dir_sep(path[1])) {
1796
1797                 /* skip server name */
1798                 char *pos = strpbrk(path + 2, "\\/");
1799                 if (!pos)
1800                         return 0;
1801
1802                 do {
1803                         pos++;
1804                 } while (*pos && !is_dir_sep(*pos));
1805
1806                 return pos - path;
1807         }
1808
1809         return is_dir_sep(path[0]);
1810 }