compat/mingw.c

   1 #include "../git-compat-util.h"
   2 #include "win32.h"
   3 #include <conio.h>
   4 #include "../strbuf.h"
   5 #include "../run-command.h"
   6
   7 static const int delay[] = { 0, 1, 10, 20, 40 };
   8
   9 int err_win_to_posix(DWORD winerr)
  10 {
  11         int error = ENOSYS;
  12         switch(winerr) {
  13         case ERROR_ACCESS_DENIED: error = EACCES; break;
  14         case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  15         case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  16         case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  17         case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  18         case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  19         case ERROR_BAD_COMMAND: error = EIO; break;
  20         case ERROR_BAD_DEVICE: error = ENODEV; break;
  21         case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  22         case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  23         case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  24         case ERROR_BAD_LENGTH: error = EINVAL; break;
  25         case ERROR_BAD_PATHNAME: error = ENOENT; break;
  26         case ERROR_BAD_PIPE: error = EPIPE; break;
  27         case ERROR_BAD_UNIT: error = ENODEV; break;
  28         case ERROR_BAD_USERNAME: error = EINVAL; break;
  29         case ERROR_BROKEN_PIPE: error = EPIPE; break;
  30         case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  31         case ERROR_BUSY: error = EBUSY; break;
  32         case ERROR_BUSY_DRIVE: error = EBUSY; break;
  33         case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  34         case ERROR_CANNOT_MAKE: error = EACCES; break;
  35         case ERROR_CANTOPEN: error = EIO; break;
  36         case ERROR_CANTREAD: error = EIO; break;
  37         case ERROR_CANTWRITE: error = EIO; break;
  38         case ERROR_CRC: error = EIO; break;
  39         case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  40         case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  41         case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  42         case ERROR_DIRECTORY: error = EINVAL; break;
  43         case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  44         case ERROR_DISK_CHANGE: error = EIO; break;
  45         case ERROR_DISK_FULL: error = ENOSPC; break;
  46         case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  47         case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  48         case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  49         case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  50         case ERROR_FILE_EXISTS: error = EEXIST; break;
  51         case ERROR_FILE_INVALID: error = ENODEV; break;
  52         case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  53         case ERROR_GEN_FAILURE: error = EIO; break;
  54         case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  55         case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  56         case ERROR_INVALID_ACCESS: error = EACCES; break;
  57         case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  58         case ERROR_INVALID_BLOCK: error = EFAULT; break;
  59         case ERROR_INVALID_DATA: error = EINVAL; break;
  60         case ERROR_INVALID_DRIVE: error = ENODEV; break;
  61         case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  62         case ERROR_INVALID_FLAGS: error = EINVAL; break;
  63         case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  64         case ERROR_INVALID_HANDLE: error = EBADF; break;
  65         case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  66         case ERROR_INVALID_NAME: error = EINVAL; break;
  67         case ERROR_INVALID_OWNER: error = EINVAL; break;
  68         case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  69         case ERROR_INVALID_PASSWORD: error = EPERM; break;
  70         case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  71         case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  72         case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  73         case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  74         case ERROR_IO_DEVICE: error = EIO; break;
  75         case ERROR_IO_INCOMPLETE: error = EINTR; break;
  76         case ERROR_LOCKED: error = EBUSY; break;
  77         case ERROR_LOCK_VIOLATION: error = EACCES; break;
  78         case ERROR_LOGON_FAILURE: error = EACCES; break;
  79         case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  80         case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  81         case ERROR_MORE_DATA: error = EPIPE; break;
  82         case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  83         case ERROR_NOACCESS: error = EFAULT; break;
  84         case ERROR_NONE_MAPPED: error = EINVAL; break;
  85         case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  86         case ERROR_NOT_READY: error = EAGAIN; break;
  87         case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  88         case ERROR_NO_DATA: error = EPIPE; break;
  89         case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  90         case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  91         case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  92         case ERROR_OPEN_FAILED: error = EIO; break;
  93         case ERROR_OPEN_FILES: error = EBUSY; break;
  94         case ERROR_OPERATION_ABORTED: error = EINTR; break;
  95         case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  96         case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
  97         case ERROR_PATH_BUSY: error = EBUSY; break;
  98         case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
  99         case ERROR_PIPE_BUSY: error = EBUSY; break;
 100         case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 101         case ERROR_PIPE_LISTENING: error = EPIPE; break;
 102         case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 103         case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 104         case ERROR_READ_FAULT: error = EIO; break;
 105         case ERROR_SEEK: error = EIO; break;
 106         case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 107         case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 108         case ERROR_SHARING_VIOLATION: error = EACCES; break;
 109         case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 110         case ERROR_SWAPERROR: error = ENOENT; break;
 111         case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 112         case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 113         case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 114         case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 115         case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 116         case ERROR_WRITE_FAULT: error = EIO; break;
 117         case ERROR_WRITE_PROTECT: error = EROFS; break;
 118         }
 119         return error;
 120 }
 121
 122 static inline int is_file_in_use_error(DWORD errcode)
 123 {
 124         switch (errcode) {
 125         case ERROR_SHARING_VIOLATION:
 126         case ERROR_ACCESS_DENIED:
 127                 return 1;
 128         }
 129
 130         return 0;
 131 }
 132
 133 static int read_yes_no_answer(void)
 134 {
 135         char answer[1024];
 136
 137         if (fgets(answer, sizeof(answer), stdin)) {
 138                 size_t answer_len = strlen(answer);
 139                 int got_full_line = 0, c;
 140
 141                 /* remove the newline */
 142                 if (answer_len >= 2 && answer[answer_len-2] == '\r') {
 143                         answer[answer_len-2] = '\0';
 144                         got_full_line = 1;
 145                 } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
 146                         answer[answer_len-1] = '\0';
 147                         got_full_line = 1;
 148                 }
 149                 /* flush the buffer in case we did not get the full line */
 150                 if (!got_full_line)
 151                         while ((c = getchar()) != EOF && c != '\n')
 152                                 ;
 153         } else
 154                 /* we could not read, return the
 155                  * default answer which is no */
 156                 return 0;
 157
 158         if (tolower(answer[0]) == 'y' && !answer[1])
 159                 return 1;
 160         if (!strncasecmp(answer, "yes", sizeof(answer)))
 161                 return 1;
 162         if (tolower(answer[0]) == 'n' && !answer[1])
 163                 return 0;
 164         if (!strncasecmp(answer, "no", sizeof(answer)))
 165                 return 0;
 166
 167         /* did not find an answer we understand */
 168         return -1;
 169 }
 170
 171 static int ask_yes_no_if_possible(const char *format, ...)
 172 {
 173         char question[4096];
 174         const char *retry_hook[] = { NULL, NULL, NULL };
 175         va_list args;
 176
 177         va_start(args, format);
 178         vsnprintf(question, sizeof(question), format, args);
 179         va_end(args);
 180
 181         if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) {
 182                 retry_hook[1] = question;
 183                 return !run_command_v_opt(retry_hook, 0);
 184         }
 185
 186         if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
 187                 return 0;
 188
 189         while (1) {
 190                 int answer;
 191                 fprintf(stderr, "%s (y/n) ", question);
 192
 193                 if ((answer = read_yes_no_answer()) >= 0)
 194                         return answer;
 195
 196                 fprintf(stderr, "Sorry, I did not understand your answer. "
 197                                 "Please type 'y' or 'n'\n");
 198         }
 199 }
 200
 201 #undef unlink
 202 int mingw_unlink(const char *pathname)
 203 {
 204         int ret, tries = 0;
 205
 206         /* read-only files cannot be removed */
 207         chmod(pathname, 0666);
 208         while ((ret = unlink(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 209                 if (!is_file_in_use_error(GetLastError()))
 210                         break;
 211                 /*
 212                  * We assume that some other process had the source or
 213                  * destination file open at the wrong moment and retry.
 214                  * In order to give the other process a higher chance to
 215                  * complete its operation, we give up our time slice now.
 216                  * If we have to retry again, we do sleep a bit.
 217                  */
 218                 Sleep(delay[tries]);
 219                 tries++;
 220         }
 221         while (ret == -1 && is_file_in_use_error(GetLastError()) &&
 222                ask_yes_no_if_possible("Unlink of file '%s' failed. "
 223                         "Should I try again?", pathname))
 224                ret = unlink(pathname);
 225         return ret;
 226 }
 227
 228 static int is_dir_empty(const char *path)
 229 {
 230         struct strbuf buf = STRBUF_INIT;
 231         WIN32_FIND_DATAA findbuf;
 232         HANDLE handle;
 233
 234         strbuf_addf(&buf, "%s\\*", path);
 235         handle = FindFirstFileA(buf.buf, &findbuf);
 236         if (handle == INVALID_HANDLE_VALUE) {
 237                 strbuf_release(&buf);
 238                 return GetLastError() == ERROR_NO_MORE_FILES;
 239         }
 240
 241         while (!strcmp(findbuf.cFileName, ".") ||
 242                         !strcmp(findbuf.cFileName, ".."))
 243                 if (!FindNextFile(handle, &findbuf)) {
 244                         strbuf_release(&buf);
 245                         return GetLastError() == ERROR_NO_MORE_FILES;
 246                 }
 247         FindClose(handle);
 248         strbuf_release(&buf);
 249         return 0;
 250 }
 251
 252 #undef rmdir
 253 int mingw_rmdir(const char *pathname)
 254 {
 255         int ret, tries = 0;
 256
 257         while ((ret = rmdir(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 258                 if (!is_file_in_use_error(GetLastError()))
 259                         errno = err_win_to_posix(GetLastError());
 260                 if (errno != EACCES)
 261                         break;
 262                 if (!is_dir_empty(pathname)) {
 263                         errno = ENOTEMPTY;
 264                         break;
 265                 }
 266                 /*
 267                  * We assume that some other process had the source or
 268                  * destination file open at the wrong moment and retry.
 269                  * In order to give the other process a higher chance to
 270                  * complete its operation, we give up our time slice now.
 271                  * If we have to retry again, we do sleep a bit.
 272                  */
 273                 Sleep(delay[tries]);
 274                 tries++;
 275         }
 276         while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
 277                ask_yes_no_if_possible("Deletion of directory '%s' failed. "
 278                         "Should I try again?", pathname))
 279                ret = rmdir(pathname);
 280         return ret;
 281 }
 282
 283 #undef open
 284 int mingw_open (const char *filename, int oflags, ...)
 285 {
 286         va_list args;
 287         unsigned mode;
 288         int fd;
 289
 290         va_start(args, oflags);
 291         mode = va_arg(args, int);
 292         va_end(args);
 293
 294         if (filename && !strcmp(filename, "/dev/null"))
 295                 filename = "nul";
 296
 297         fd = open(filename, oflags, mode);
 298
 299         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 300                 DWORD attrs = GetFileAttributes(filename);
 301                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 302                         errno = EISDIR;
 303         }
 304         return fd;
 305 }
 306
 307 #undef write
 308 ssize_t mingw_write(int fd, const void *buf, size_t count)
 309 {
 310         /*
 311          * While write() calls to a file on a local disk are translated
 312          * into WriteFile() calls with a maximum size of 64KB on Windows
 313          * XP and 256KB on Vista, no such cap is placed on writes to
 314          * files over the network on Windows XP.  Unfortunately, there
 315          * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 316          * bigger writes fail on Windows XP.
 317          * So we cap to a nice 31MB here to avoid write failures over
 318          * the net without changing the number of WriteFile() calls in
 319          * the local case.
 320          */
 321         return write(fd, buf, min(count, 31 * 1024 * 1024));
 322 }
 323
 324 static BOOL WINAPI ctrl_ignore(DWORD type)
 325 {
 326         return TRUE;
 327 }
 328
 329 #undef fgetc
 330 int mingw_fgetc(FILE *stream)
 331 {
 332         int ch;
 333         if (!isatty(_fileno(stream)))
 334                 return fgetc(stream);
 335
 336         SetConsoleCtrlHandler(ctrl_ignore, TRUE);
 337         while (1) {
 338                 ch = fgetc(stream);
 339                 if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
 340                         break;
 341
 342                 /* Ctrl+C was pressed, simulate SIGINT and retry */
 343                 mingw_raise(SIGINT);
 344         }
 345         SetConsoleCtrlHandler(ctrl_ignore, FALSE);
 346         return ch;
 347 }
 348
 349 #undef fopen
 350 FILE *mingw_fopen (const char *filename, const char *otype)
 351 {
 352         if (filename && !strcmp(filename, "/dev/null"))
 353                 filename = "nul";
 354         return fopen(filename, otype);
 355 }
 356
 357 #undef freopen
 358 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 359 {
 360         if (filename && !strcmp(filename, "/dev/null"))
 361                 filename = "nul";
 362         return freopen(filename, otype, stream);
 363 }
 364
 365 #undef fflush
 366 int mingw_fflush(FILE *stream)
 367 {
 368         int ret = fflush(stream);
 369
 370         /*
 371          * write() is used behind the scenes of stdio output functions.
 372          * Since git code does not check for errors after each stdio write
 373          * operation, it can happen that write() is called by a later
 374          * stdio function even if an earlier write() call failed. In the
 375          * case of a pipe whose readable end was closed, only the first
 376          * call to write() reports EPIPE on Windows. Subsequent write()
 377          * calls report EINVAL. It is impossible to notice whether this
 378          * fflush invocation triggered such a case, therefore, we have to
 379          * catch all EINVAL errors whole-sale.
 380          */
 381         if (ret && errno == EINVAL)
 382                 errno = EPIPE;
 383
 384         return ret;
 385 }
 386
 387 /*
 388  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 389  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 390  */
 391 static inline long long filetime_to_hnsec(const FILETIME *ft)
 392 {
 393         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 394         /* Windows to Unix Epoch conversion */
 395         return winTime - 116444736000000000LL;
 396 }
 397
 398 static inline time_t filetime_to_time_t(const FILETIME *ft)
 399 {
 400         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 401 }
 402
 403 /* We keep the do_lstat code in a separate function to avoid recursion.
 404  * When a path ends with a slash, the stat will fail with ENOENT. In
 405  * this case, we strip the trailing slashes and stat again.
 406  *
 407  * If follow is true then act like stat() and report on the link
 408  * target. Otherwise report on the link itself.
 409  */
 410 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 411 {
 412         int err;
 413         WIN32_FILE_ATTRIBUTE_DATA fdata;
 414
 415         if (!(err = get_file_attr(file_name, &fdata))) {
 416                 buf->st_ino = 0;
 417                 buf->st_gid = 0;
 418                 buf->st_uid = 0;
 419                 buf->st_nlink = 1;
 420                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 421                 buf->st_size = fdata.nFileSizeLow |
 422                         (((off_t)fdata.nFileSizeHigh)<<32);
 423                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 424                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 425                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 426                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 427                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 428                         WIN32_FIND_DATAA findbuf;
 429                         HANDLE handle = FindFirstFileA(file_name, &findbuf);
 430                         if (handle != INVALID_HANDLE_VALUE) {
 431                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 432                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 433                                         if (follow) {
 434                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 435                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 436                                         } else {
 437                                                 buf->st_mode = S_IFLNK;
 438                                         }
 439                                         buf->st_mode |= S_IREAD;
 440                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 441                                                 buf->st_mode |= S_IWRITE;
 442                                 }
 443                                 FindClose(handle);
 444                         }
 445                 }
 446                 return 0;
 447         }
 448         errno = err;
 449         return -1;
 450 }
 451
 452 /* We provide our own lstat/fstat functions, since the provided
 453  * lstat/fstat functions are so slow. These stat functions are
 454  * tailored for Git's usage (read: fast), and are not meant to be
 455  * complete. Note that Git stat()s are redirected to mingw_lstat()
 456  * too, since Windows doesn't really handle symlinks that well.
 457  */
 458 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 459 {
 460         int namelen;
 461         static char alt_name[PATH_MAX];
 462
 463         if (!do_lstat(follow, file_name, buf))
 464                 return 0;
 465
 466         /* if file_name ended in a '/', Windows returned ENOENT;
 467          * try again without trailing slashes
 468          */
 469         if (errno != ENOENT)
 470                 return -1;
 471
 472         namelen = strlen(file_name);
 473         if (namelen && file_name[namelen-1] != '/')
 474                 return -1;
 475         while (namelen && file_name[namelen-1] == '/')
 476                 --namelen;
 477         if (!namelen || namelen >= PATH_MAX)
 478                 return -1;
 479
 480         memcpy(alt_name, file_name, namelen);
 481         alt_name[namelen] = 0;
 482         return do_lstat(follow, alt_name, buf);
 483 }
 484
 485 int mingw_lstat(const char *file_name, struct stat *buf)
 486 {
 487         return do_stat_internal(0, file_name, buf);
 488 }
 489 int mingw_stat(const char *file_name, struct stat *buf)
 490 {
 491         return do_stat_internal(1, file_name, buf);
 492 }
 493
 494 #undef fstat
 495 int mingw_fstat(int fd, struct stat *buf)
 496 {
 497         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 498         BY_HANDLE_FILE_INFORMATION fdata;
 499
 500         if (fh == INVALID_HANDLE_VALUE) {
 501                 errno = EBADF;
 502                 return -1;
 503         }
 504         /* direct non-file handles to MS's fstat() */
 505         if (GetFileType(fh) != FILE_TYPE_DISK)
 506                 return _fstati64(fd, buf);
 507
 508         if (GetFileInformationByHandle(fh, &fdata)) {
 509                 buf->st_ino = 0;
 510                 buf->st_gid = 0;
 511                 buf->st_uid = 0;
 512                 buf->st_nlink = 1;
 513                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 514                 buf->st_size = fdata.nFileSizeLow |
 515                         (((off_t)fdata.nFileSizeHigh)<<32);
 516                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 517                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 518                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 519                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 520                 return 0;
 521         }
 522         errno = EBADF;
 523         return -1;
 524 }
 525
 526 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 527 {
 528         long long winTime = t * 10000000LL + 116444736000000000LL;
 529         ft->dwLowDateTime = winTime;
 530         ft->dwHighDateTime = winTime >> 32;
 531 }
 532
 533 int mingw_utime (const char *file_name, const struct utimbuf *times)
 534 {
 535         FILETIME mft, aft;
 536         int fh, rc;
 537
 538         /* must have write permission */
 539         DWORD attrs = GetFileAttributes(file_name);
 540         if (attrs != INVALID_FILE_ATTRIBUTES &&
 541             (attrs & FILE_ATTRIBUTE_READONLY)) {
 542                 /* ignore errors here; open() will report them */
 543                 SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 544         }
 545
 546         if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 547                 rc = -1;
 548                 goto revert_attrs;
 549         }
 550
 551         if (times) {
 552                 time_t_to_filetime(times->modtime, &mft);
 553                 time_t_to_filetime(times->actime, &aft);
 554         } else {
 555                 GetSystemTimeAsFileTime(&mft);
 556                 aft = mft;
 557         }
 558         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 559                 errno = EINVAL;
 560                 rc = -1;
 561         } else
 562                 rc = 0;
 563         close(fh);
 564
 565 revert_attrs:
 566         if (attrs != INVALID_FILE_ATTRIBUTES &&
 567             (attrs & FILE_ATTRIBUTE_READONLY)) {
 568                 /* ignore errors again */
 569                 SetFileAttributes(file_name, attrs);
 570         }
 571         return rc;
 572 }
 573
 574 unsigned int sleep (unsigned int seconds)
 575 {
 576         Sleep(seconds*1000);
 577         return 0;
 578 }
 579
 580 int mkstemp(char *template)
 581 {
 582         char *filename = mktemp(template);
 583         if (filename == NULL)
 584                 return -1;
 585         return open(filename, O_RDWR | O_CREAT, 0600);
 586 }
 587
 588 int gettimeofday(struct timeval *tv, void *tz)
 589 {
 590         FILETIME ft;
 591         long long hnsec;
 592
 593         GetSystemTimeAsFileTime(&ft);
 594         hnsec = filetime_to_hnsec(&ft);
 595         tv->tv_sec = hnsec / 10000000;
 596         tv->tv_usec = (hnsec % 10000000) / 10;
 597         return 0;
 598 }
 599
 600 int pipe(int filedes[2])
 601 {
 602         HANDLE h[2];
 603
 604         /* this creates non-inheritable handles */
 605         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 606                 errno = err_win_to_posix(GetLastError());
 607                 return -1;
 608         }
 609         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 610         if (filedes[0] < 0) {
 611                 CloseHandle(h[0]);
 612                 CloseHandle(h[1]);
 613                 return -1;
 614         }
 615         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 616         if (filedes[0] < 0) {
 617                 close(filedes[0]);
 618                 CloseHandle(h[1]);
 619                 return -1;
 620         }
 621         return 0;
 622 }
 623
 624 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 625 {
 626         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 627         memcpy(result, gmtime(timep), sizeof(struct tm));
 628         return result;
 629 }
 630
 631 struct tm *localtime_r(const time_t *timep, struct tm *result)
 632 {
 633         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 634         memcpy(result, localtime(timep), sizeof(struct tm));
 635         return result;
 636 }
 637
 638 #undef getcwd
 639 char *mingw_getcwd(char *pointer, int len)
 640 {
 641         int i;
 642         char *ret = getcwd(pointer, len);
 643         if (!ret)
 644                 return ret;
 645         for (i = 0; pointer[i]; i++)
 646                 if (pointer[i] == '\\')
 647                         pointer[i] = '/';
 648         return ret;
 649 }
 650
 651 /*
 652  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 653  * (Parsing C++ Command-Line Arguments)
 654  */
 655 static const char *quote_arg(const char *arg)
 656 {
 657         /* count chars to quote */
 658         int len = 0, n = 0;
 659         int force_quotes = 0;
 660         char *q, *d;
 661         const char *p = arg;
 662         if (!*p) force_quotes = 1;
 663         while (*p) {
 664                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 665                         force_quotes = 1;
 666                 else if (*p == '"')
 667                         n++;
 668                 else if (*p == '\\') {
 669                         int count = 0;
 670                         while (*p == '\\') {
 671                                 count++;
 672                                 p++;
 673                                 len++;
 674                         }
 675                         if (*p == '"')
 676                                 n += count*2 + 1;
 677                         continue;
 678                 }
 679                 len++;
 680                 p++;
 681         }
 682         if (!force_quotes && n == 0)
 683                 return arg;
 684
 685         /* insert \ where necessary */
 686         d = q = xmalloc(len+n+3);
 687         *d++ = '"';
 688         while (*arg) {
 689                 if (*arg == '"')
 690                         *d++ = '\\';
 691                 else if (*arg == '\\') {
 692                         int count = 0;
 693                         while (*arg == '\\') {
 694                                 count++;
 695                                 *d++ = *arg++;
 696                         }
 697                         if (*arg == '"') {
 698                                 while (count-- > 0)
 699                                         *d++ = '\\';
 700                                 *d++ = '\\';
 701                         }
 702                 }
 703                 *d++ = *arg++;
 704         }
 705         *d++ = '"';
 706         *d++ = 0;
 707         return q;
 708 }
 709
 710 static const char *parse_interpreter(const char *cmd)
 711 {
 712         static char buf[100];
 713         char *p, *opt;
 714         int n, fd;
 715
 716         /* don't even try a .exe */
 717         n = strlen(cmd);
 718         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 719                 return NULL;
 720
 721         fd = open(cmd, O_RDONLY);
 722         if (fd < 0)
 723                 return NULL;
 724         n = read(fd, buf, sizeof(buf)-1);
 725         close(fd);
 726         if (n < 4)      /* at least '#!/x' and not error */
 727                 return NULL;
 728
 729         if (buf[0] != '#' || buf[1] != '!')
 730                 return NULL;
 731         buf[n] = '\0';
 732         p = buf + strcspn(buf, "\r\n");
 733         if (!*p)
 734                 return NULL;
 735
 736         *p = '\0';
 737         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 738                 return NULL;
 739         /* strip options */
 740         if ((opt = strchr(p+1, ' ')))
 741                 *opt = '\0';
 742         return p+1;
 743 }
 744
 745 /*
 746  * Splits the PATH into parts.
 747  */
 748 static char **get_path_split(void)
 749 {
 750         char *p, **path, *envpath = mingw_getenv("PATH");
 751         int i, n = 0;
 752
 753         if (!envpath || !*envpath)
 754                 return NULL;
 755
 756         envpath = xstrdup(envpath);
 757         p = envpath;
 758         while (p) {
 759                 char *dir = p;
 760                 p = strchr(p, ';');
 761                 if (p) *p++ = '\0';
 762                 if (*dir) {     /* not earlier, catches series of ; */
 763                         ++n;
 764                 }
 765         }
 766         if (!n)
 767                 return NULL;
 768
 769         path = xmalloc((n+1)*sizeof(char *));
 770         p = envpath;
 771         i = 0;
 772         do {
 773                 if (*p)
 774                         path[i++] = xstrdup(p);
 775                 p = p+strlen(p)+1;
 776         } while (i < n);
 777         path[i] = NULL;
 778
 779         free(envpath);
 780
 781         return path;
 782 }
 783
 784 static void free_path_split(char **path)
 785 {
 786         char **p = path;
 787
 788         if (!path)
 789                 return;
 790
 791         while (*p)
 792                 free(*p++);
 793         free(path);
 794 }
 795
 796 /*
 797  * exe_only means that we only want to detect .exe files, but not scripts
 798  * (which do not have an extension)
 799  */
 800 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 801 {
 802         char path[MAX_PATH];
 803         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 804
 805         if (!isexe && access(path, F_OK) == 0)
 806                 return xstrdup(path);
 807         path[strlen(path)-4] = '\0';
 808         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 809                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 810                         return xstrdup(path);
 811         return NULL;
 812 }
 813
 814 /*
 815  * Determines the absolute path of cmd using the split path in path.
 816  * If cmd contains a slash or backslash, no lookup is performed.
 817  */
 818 static char *path_lookup(const char *cmd, char **path, int exe_only)
 819 {
 820         char *prog = NULL;
 821         int len = strlen(cmd);
 822         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 823
 824         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 825                 prog = xstrdup(cmd);
 826
 827         while (!prog && *path)
 828                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 829
 830         return prog;
 831 }
 832
 833 static int env_compare(const void *a, const void *b)
 834 {
 835         char *const *ea = a;
 836         char *const *eb = b;
 837         return strcasecmp(*ea, *eb);
 838 }
 839
 840 struct pinfo_t {
 841         struct pinfo_t *next;
 842         pid_t pid;
 843         HANDLE proc;
 844 };
 845 static struct pinfo_t *pinfo = NULL;
 846 CRITICAL_SECTION pinfo_cs;
 847
 848 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 849                               const char *dir,
 850                               int prepend_cmd, int fhin, int fhout, int fherr)
 851 {
 852         STARTUPINFO si;
 853         PROCESS_INFORMATION pi;
 854         struct strbuf envblk, args;
 855         unsigned flags;
 856         BOOL ret;
 857
 858         /* Determine whether or not we are associated to a console */
 859         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 860                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 861                         FILE_ATTRIBUTE_NORMAL, NULL);
 862         if (cons == INVALID_HANDLE_VALUE) {
 863                 /* There is no console associated with this process.
 864                  * Since the child is a console process, Windows
 865                  * would normally create a console window. But
 866                  * since we'll be redirecting std streams, we do
 867                  * not need the console.
 868                  * It is necessary to use DETACHED_PROCESS
 869                  * instead of CREATE_NO_WINDOW to make ssh
 870                  * recognize that it has no console.
 871                  */
 872                 flags = DETACHED_PROCESS;
 873         } else {
 874                 /* There is already a console. If we specified
 875                  * DETACHED_PROCESS here, too, Windows would
 876                  * disassociate the child from the console.
 877                  * The same is true for CREATE_NO_WINDOW.
 878                  * Go figure!
 879                  */
 880                 flags = 0;
 881                 CloseHandle(cons);
 882         }
 883         memset(&si, 0, sizeof(si));
 884         si.cb = sizeof(si);
 885         si.dwFlags = STARTF_USESTDHANDLES;
 886         si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 887         si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 888         si.hStdError = (HANDLE) _get_osfhandle(fherr);
 889
 890         /* concatenate argv, quoting args as we go */
 891         strbuf_init(&args, 0);
 892         if (prepend_cmd) {
 893                 char *quoted = (char *)quote_arg(cmd);
 894                 strbuf_addstr(&args, quoted);
 895                 if (quoted != cmd)
 896                         free(quoted);
 897         }
 898         for (; *argv; argv++) {
 899                 char *quoted = (char *)quote_arg(*argv);
 900                 if (*args.buf)
 901                         strbuf_addch(&args, ' ');
 902                 strbuf_addstr(&args, quoted);
 903                 if (quoted != *argv)
 904                         free(quoted);
 905         }
 906
 907         if (env) {
 908                 int count = 0;
 909                 char **e, **sorted_env;
 910
 911                 for (e = env; *e; e++)
 912                         count++;
 913
 914                 /* environment must be sorted */
 915                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 916                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 917                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 918
 919                 strbuf_init(&envblk, 0);
 920                 for (e = sorted_env; *e; e++) {
 921                         strbuf_addstr(&envblk, *e);
 922                         strbuf_addch(&envblk, '\0');
 923                 }
 924                 free(sorted_env);
 925         }
 926
 927         memset(&pi, 0, sizeof(pi));
 928         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 929                 env ? envblk.buf : NULL, dir, &si, &pi);
 930
 931         if (env)
 932                 strbuf_release(&envblk);
 933         strbuf_release(&args);
 934
 935         if (!ret) {
 936                 errno = ENOENT;
 937                 return -1;
 938         }
 939         CloseHandle(pi.hThread);
 940
 941         /*
 942          * The process ID is the human-readable identifier of the process
 943          * that we want to present in log and error messages. The handle
 944          * is not useful for this purpose. But we cannot close it, either,
 945          * because it is not possible to turn a process ID into a process
 946          * handle after the process terminated.
 947          * Keep the handle in a list for waitpid.
 948          */
 949         EnterCriticalSection(&pinfo_cs);
 950         {
 951                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
 952                 info->pid = pi.dwProcessId;
 953                 info->proc = pi.hProcess;
 954                 info->next = pinfo;
 955                 pinfo = info;
 956         }
 957         LeaveCriticalSection(&pinfo_cs);
 958
 959         return (pid_t)pi.dwProcessId;
 960 }
 961
 962 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 963                            int prepend_cmd)
 964 {
 965         return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 966 }
 967
 968 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 969                      const char *dir,
 970                      int fhin, int fhout, int fherr)
 971 {
 972         pid_t pid;
 973         char **path = get_path_split();
 974         char *prog = path_lookup(cmd, path, 0);
 975
 976         if (!prog) {
 977                 errno = ENOENT;
 978                 pid = -1;
 979         }
 980         else {
 981                 const char *interpr = parse_interpreter(prog);
 982
 983                 if (interpr) {
 984                         const char *argv0 = argv[0];
 985                         char *iprog = path_lookup(interpr, path, 1);
 986                         argv[0] = prog;
 987                         if (!iprog) {
 988                                 errno = ENOENT;
 989                                 pid = -1;
 990                         }
 991                         else {
 992                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 993                                                        fhin, fhout, fherr);
 994                                 free(iprog);
 995                         }
 996                         argv[0] = argv0;
 997                 }
 998                 else
 999                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
1000                                                fhin, fhout, fherr);
1001                 free(prog);
1002         }
1003         free_path_split(path);
1004         return pid;
1005 }
1006
1007 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
1008 {
1009         const char *interpr = parse_interpreter(cmd);
1010         char **path;
1011         char *prog;
1012         int pid = 0;
1013
1014         if (!interpr)
1015                 return 0;
1016         path = get_path_split();
1017         prog = path_lookup(interpr, path, 1);
1018         if (prog) {
1019                 int argc = 0;
1020                 const char **argv2;
1021                 while (argv[argc]) argc++;
1022                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1023                 argv2[0] = (char *)cmd; /* full path to the script file */
1024                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1025                 pid = mingw_spawnve(prog, argv2, env, 1);
1026                 if (pid >= 0) {
1027                         int status;
1028                         if (waitpid(pid, &status, 0) < 0)
1029                                 status = 255;
1030                         exit(status);
1031                 }
1032                 pid = 1;        /* indicate that we tried but failed */
1033                 free(prog);
1034                 free(argv2);
1035         }
1036         free_path_split(path);
1037         return pid;
1038 }
1039
1040 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
1041 {
1042         /* check if git_command is a shell script */
1043         if (!try_shell_exec(cmd, argv, (char **)env)) {
1044                 int pid, status;
1045
1046                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
1047                 if (pid < 0)
1048                         return;
1049                 if (waitpid(pid, &status, 0) < 0)
1050                         status = 255;
1051                 exit(status);
1052         }
1053 }
1054
1055 int mingw_execvp(const char *cmd, char *const *argv)
1056 {
1057         char **path = get_path_split();
1058         char *prog = path_lookup(cmd, path, 0);
1059
1060         if (prog) {
1061                 mingw_execve(prog, argv, environ);
1062                 free(prog);
1063         } else
1064                 errno = ENOENT;
1065
1066         free_path_split(path);
1067         return -1;
1068 }
1069
1070 int mingw_execv(const char *cmd, char *const *argv)
1071 {
1072         mingw_execve(cmd, argv, environ);
1073         return -1;
1074 }
1075
1076 int mingw_kill(pid_t pid, int sig)
1077 {
1078         if (pid > 0 && sig == SIGTERM) {
1079                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1080
1081                 if (TerminateProcess(h, -1)) {
1082                         CloseHandle(h);
1083                         return 0;
1084                 }
1085
1086                 errno = err_win_to_posix(GetLastError());
1087                 CloseHandle(h);
1088                 return -1;
1089         } else if (pid > 0 && sig == 0) {
1090                 HANDLE h = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
1091                 if (h) {
1092                         CloseHandle(h);
1093                         return 0;
1094                 }
1095         }
1096
1097         errno = EINVAL;
1098         return -1;
1099 }
1100
1101 static char **copy_environ(void)
1102 {
1103         char **env;
1104         int i = 0;
1105         while (environ[i])
1106                 i++;
1107         env = xmalloc((i+1)*sizeof(*env));
1108         for (i = 0; environ[i]; i++)
1109                 env[i] = xstrdup(environ[i]);
1110         env[i] = NULL;
1111         return env;
1112 }
1113
1114 void free_environ(char **env)
1115 {
1116         int i;
1117         for (i = 0; env[i]; i++)
1118                 free(env[i]);
1119         free(env);
1120 }
1121
1122 static int lookup_env(char **env, const char *name, size_t nmln)
1123 {
1124         int i;
1125
1126         for (i = 0; env[i]; i++) {
1127                 if (0 == strncmp(env[i], name, nmln)
1128                     && '=' == env[i][nmln])
1129                         /* matches */
1130                         return i;
1131         }
1132         return -1;
1133 }
1134
1135 /*
1136  * If name contains '=', then sets the variable, otherwise it unsets it
1137  */
1138 static char **env_setenv(char **env, const char *name)
1139 {
1140         char *eq = strchrnul(name, '=');
1141         int i = lookup_env(env, name, eq-name);
1142
1143         if (i < 0) {
1144                 if (*eq) {
1145                         for (i = 0; env[i]; i++)
1146                                 ;
1147                         env = xrealloc(env, (i+2)*sizeof(*env));
1148                         env[i] = xstrdup(name);
1149                         env[i+1] = NULL;
1150                 }
1151         }
1152         else {
1153                 free(env[i]);
1154                 if (*eq)
1155                         env[i] = xstrdup(name);
1156                 else
1157                         for (; env[i]; i++)
1158                                 env[i] = env[i+1];
1159         }
1160         return env;
1161 }
1162
1163 /*
1164  * Copies global environ and adjusts variables as specified by vars.
1165  */
1166 char **make_augmented_environ(const char *const *vars)
1167 {
1168         char **env = copy_environ();
1169
1170         while (*vars)
1171                 env = env_setenv(env, *vars++);
1172         return env;
1173 }
1174
1175 #undef getenv
1176
1177 /*
1178  * The system's getenv looks up the name in a case-insensitive manner.
1179  * This version tries a case-sensitive lookup and falls back to
1180  * case-insensitive if nothing was found.  This is necessary because,
1181  * as a prominent example, CMD sets 'Path', but not 'PATH'.
1182  * Warning: not thread-safe.
1183  */
1184 static char *getenv_cs(const char *name)
1185 {
1186         size_t len = strlen(name);
1187         int i = lookup_env(environ, name, len);
1188         if (i >= 0)
1189                 return environ[i] + len + 1;    /* skip past name and '=' */
1190         return getenv(name);
1191 }
1192
1193 char *mingw_getenv(const char *name)
1194 {
1195         char *result = getenv_cs(name);
1196         if (!result && !strcmp(name, "TMPDIR")) {
1197                 /* on Windows it is TMP and TEMP */
1198                 result = getenv_cs("TMP");
1199                 if (!result)
1200                         result = getenv_cs("TEMP");
1201         }
1202         return result;
1203 }
1204
1205 /*
1206  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1207  * that service contains a numerical port, or that it is null. It
1208  * does a simple search using gethostbyname, and returns one IPv4 host
1209  * if one was found.
1210  */
1211 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1212                                    const struct addrinfo *hints,
1213                                    struct addrinfo **res)
1214 {
1215         struct hostent *h = NULL;
1216         struct addrinfo *ai;
1217         struct sockaddr_in *sin;
1218
1219         if (node) {
1220                 h = gethostbyname(node);
1221                 if (!h)
1222                         return WSAGetLastError();
1223         }
1224
1225         ai = xmalloc(sizeof(struct addrinfo));
1226         *res = ai;
1227         ai->ai_flags = 0;
1228         ai->ai_family = AF_INET;
1229         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1230         switch (ai->ai_socktype) {
1231         case SOCK_STREAM:
1232                 ai->ai_protocol = IPPROTO_TCP;
1233                 break;
1234         case SOCK_DGRAM:
1235                 ai->ai_protocol = IPPROTO_UDP;
1236                 break;
1237         default:
1238                 ai->ai_protocol = 0;
1239                 break;
1240         }
1241         ai->ai_addrlen = sizeof(struct sockaddr_in);
1242         if (hints && (hints->ai_flags & AI_CANONNAME))
1243                 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1244         else
1245                 ai->ai_canonname = NULL;
1246
1247         sin = xmalloc(ai->ai_addrlen);
1248         memset(sin, 0, ai->ai_addrlen);
1249         sin->sin_family = AF_INET;
1250         /* Note: getaddrinfo is supposed to allow service to be a string,
1251          * which should be looked up using getservbyname. This is
1252          * currently not implemented */
1253         if (service)
1254                 sin->sin_port = htons(atoi(service));
1255         if (h)
1256                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1257         else if (hints && (hints->ai_flags & AI_PASSIVE))
1258                 sin->sin_addr.s_addr = INADDR_ANY;
1259         else
1260                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1261         ai->ai_addr = (struct sockaddr *)sin;
1262         ai->ai_next = NULL;
1263         return 0;
1264 }
1265
1266 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1267 {
1268         free(res->ai_canonname);
1269         free(res->ai_addr);
1270         free(res);
1271 }
1272
1273 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1274                                    char *host, DWORD hostlen,
1275                                    char *serv, DWORD servlen, int flags)
1276 {
1277         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1278         if (sa->sa_family != AF_INET)
1279                 return EAI_FAMILY;
1280         if (!host && !serv)
1281                 return EAI_NONAME;
1282
1283         if (host && hostlen > 0) {
1284                 struct hostent *ent = NULL;
1285                 if (!(flags & NI_NUMERICHOST))
1286                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1287                                             sizeof(sin->sin_addr), AF_INET);
1288
1289                 if (ent)
1290                         snprintf(host, hostlen, "%s", ent->h_name);
1291                 else if (flags & NI_NAMEREQD)
1292                         return EAI_NONAME;
1293                 else
1294                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1295         }
1296
1297         if (serv && servlen > 0) {
1298                 struct servent *ent = NULL;
1299                 if (!(flags & NI_NUMERICSERV))
1300                         ent = getservbyport(sin->sin_port,
1301                                             flags & NI_DGRAM ? "udp" : "tcp");
1302
1303                 if (ent)
1304                         snprintf(serv, servlen, "%s", ent->s_name);
1305                 else
1306                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1307         }
1308
1309         return 0;
1310 }
1311
1312 static HMODULE ipv6_dll = NULL;
1313 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1314 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1315                                       const struct addrinfo *hints,
1316                                       struct addrinfo **res);
1317 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1318                                       char *host, DWORD hostlen,
1319                                       char *serv, DWORD servlen, int flags);
1320 /*
1321  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1322  * don't need to try to load that one dynamically.
1323  */
1324
1325 static void socket_cleanup(void)
1326 {
1327         WSACleanup();
1328         if (ipv6_dll)
1329                 FreeLibrary(ipv6_dll);
1330         ipv6_dll = NULL;
1331         ipv6_freeaddrinfo = freeaddrinfo_stub;
1332         ipv6_getaddrinfo = getaddrinfo_stub;
1333         ipv6_getnameinfo = getnameinfo_stub;
1334 }
1335
1336 static void ensure_socket_initialization(void)
1337 {
1338         WSADATA wsa;
1339         static int initialized = 0;
1340         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1341         const char **name;
1342
1343         if (initialized)
1344                 return;
1345
1346         if (WSAStartup(MAKEWORD(2,2), &wsa))
1347                 die("unable to initialize winsock subsystem, error %d",
1348                         WSAGetLastError());
1349
1350         for (name = libraries; *name; name++) {
1351                 ipv6_dll = LoadLibrary(*name);
1352                 if (!ipv6_dll)
1353                         continue;
1354
1355                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1356                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1357                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1358                                                    const struct addrinfo *,
1359                                                    struct addrinfo **))
1360                         GetProcAddress(ipv6_dll, "getaddrinfo");
1361                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1362                                                    socklen_t, char *, DWORD,
1363                                                    char *, DWORD, int))
1364                         GetProcAddress(ipv6_dll, "getnameinfo");
1365                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1366                         FreeLibrary(ipv6_dll);
1367                         ipv6_dll = NULL;
1368                 } else
1369                         break;
1370         }
1371         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1372                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1373                 ipv6_getaddrinfo = getaddrinfo_stub;
1374                 ipv6_getnameinfo = getnameinfo_stub;
1375         }
1376
1377         atexit(socket_cleanup);
1378         initialized = 1;
1379 }
1380
1381 #undef gethostname
1382 int mingw_gethostname(char *name, int namelen)
1383 {
1384     ensure_socket_initialization();
1385     return gethostname(name, namelen);
1386 }
1387
1388 #undef gethostbyname
1389 struct hostent *mingw_gethostbyname(const char *host)
1390 {
1391         ensure_socket_initialization();
1392         return gethostbyname(host);
1393 }
1394
1395 void mingw_freeaddrinfo(struct addrinfo *res)
1396 {
1397         ipv6_freeaddrinfo(res);
1398 }
1399
1400 int mingw_getaddrinfo(const char *node, const char *service,
1401                       const struct addrinfo *hints, struct addrinfo **res)
1402 {
1403         ensure_socket_initialization();
1404         return ipv6_getaddrinfo(node, service, hints, res);
1405 }
1406
1407 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1408                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1409                       int flags)
1410 {
1411         ensure_socket_initialization();
1412         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1413 }
1414
1415 int mingw_socket(int domain, int type, int protocol)
1416 {
1417         int sockfd;
1418         SOCKET s;
1419
1420         ensure_socket_initialization();
1421         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1422         if (s == INVALID_SOCKET) {
1423                 /*
1424                  * WSAGetLastError() values are regular BSD error codes
1425                  * biased by WSABASEERR.
1426                  * However, strerror() does not know about networking
1427                  * specific errors, which are values beginning at 38 or so.
1428                  * Therefore, we choose to leave the biased error code
1429                  * in errno so that _if_ someone looks up the code somewhere,
1430                  * then it is at least the number that are usually listed.
1431                  */
1432                 errno = WSAGetLastError();
1433                 return -1;
1434         }
1435         /* convert into a file descriptor */
1436         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1437                 closesocket(s);
1438                 return error("unable to make a socket file descriptor: %s",
1439                         strerror(errno));
1440         }
1441         return sockfd;
1442 }
1443
1444 #undef connect
1445 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1446 {
1447         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1448         return connect(s, sa, sz);
1449 }
1450
1451 #undef bind
1452 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1453 {
1454         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1455         return bind(s, sa, sz);
1456 }
1457
1458 #undef setsockopt
1459 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1460 {
1461         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1462         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1463 }
1464
1465 #undef shutdown
1466 int mingw_shutdown(int sockfd, int how)
1467 {
1468         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1469         return shutdown(s, how);
1470 }
1471
1472 #undef listen
1473 int mingw_listen(int sockfd, int backlog)
1474 {
1475         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1476         return listen(s, backlog);
1477 }
1478
1479 #undef accept
1480 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1481 {
1482         int sockfd2;
1483
1484         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1485         SOCKET s2 = accept(s1, sa, sz);
1486
1487         /* convert into a file descriptor */
1488         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1489                 int err = errno;
1490                 closesocket(s2);
1491                 return error("unable to make a socket file descriptor: %s",
1492                         strerror(err));
1493         }
1494         return sockfd2;
1495 }
1496
1497 #undef rename
1498 int mingw_rename(const char *pold, const char *pnew)
1499 {
1500         DWORD attrs, gle;
1501         int tries = 0;
1502
1503         /*
1504          * Try native rename() first to get errno right.
1505          * It is based on MoveFile(), which cannot overwrite existing files.
1506          */
1507         if (!rename(pold, pnew))
1508                 return 0;
1509         if (errno != EEXIST)
1510                 return -1;
1511 repeat:
1512         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1513                 return 0;
1514         /* TODO: translate more errors */
1515         gle = GetLastError();
1516         if (gle == ERROR_ACCESS_DENIED &&
1517             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1518                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1519                         errno = EISDIR;
1520                         return -1;
1521                 }
1522                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1523                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1524                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1525                                 return 0;
1526                         gle = GetLastError();
1527                         /* revert file attributes on failure */
1528                         SetFileAttributes(pnew, attrs);
1529                 }
1530         }
1531         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1532                 /*
1533                  * We assume that some other process had the source or
1534                  * destination file open at the wrong moment and retry.
1535                  * In order to give the other process a higher chance to
1536                  * complete its operation, we give up our time slice now.
1537                  * If we have to retry again, we do sleep a bit.
1538                  */
1539                 Sleep(delay[tries]);
1540                 tries++;
1541                 goto repeat;
1542         }
1543         if (gle == ERROR_ACCESS_DENIED &&
1544                ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1545                        "Should I try again?", pold, pnew))
1546                 goto repeat;
1547
1548         errno = EACCES;
1549         return -1;
1550 }
1551
1552 /*
1553  * Note that this doesn't return the actual pagesize, but
1554  * the allocation granularity. If future Windows specific git code
1555  * needs the real getpagesize function, we need to find another solution.
1556  */
1557 int mingw_getpagesize(void)
1558 {
1559         SYSTEM_INFO si;
1560         GetSystemInfo(&si);
1561         return si.dwAllocationGranularity;
1562 }
1563
1564 struct passwd *getpwuid(int uid)
1565 {
1566         static char user_name[100];
1567         static struct passwd p;
1568
1569         DWORD len = sizeof(user_name);
1570         if (!GetUserName(user_name, &len))
1571                 return NULL;
1572         p.pw_name = user_name;
1573         p.pw_gecos = "unknown";
1574         p.pw_dir = NULL;
1575         return &p;
1576 }
1577
1578 static HANDLE timer_event;
1579 static HANDLE timer_thread;
1580 static int timer_interval;
1581 static int one_shot;
1582 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1583
1584 /* The timer works like this:
1585  * The thread, ticktack(), is a trivial routine that most of the time
1586  * only waits to receive the signal to terminate. The main thread tells
1587  * the thread to terminate by setting the timer_event to the signalled
1588  * state.
1589  * But ticktack() interrupts the wait state after the timer's interval
1590  * length to call the signal handler.
1591  */
1592
1593 static unsigned __stdcall ticktack(void *dummy)
1594 {
1595         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1596                 mingw_raise(SIGALRM);
1597                 if (one_shot)
1598                         break;
1599         }
1600         return 0;
1601 }
1602
1603 static int start_timer_thread(void)
1604 {
1605         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1606         if (timer_event) {
1607                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1608                 if (!timer_thread )
1609                         return errno = ENOMEM,
1610                                 error("cannot start timer thread");
1611         } else
1612                 return errno = ENOMEM,
1613                         error("cannot allocate resources for timer");
1614         return 0;
1615 }
1616
1617 static void stop_timer_thread(void)
1618 {
1619         if (timer_event)
1620                 SetEvent(timer_event);  /* tell thread to terminate */
1621         if (timer_thread) {
1622                 int rc = WaitForSingleObject(timer_thread, 1000);
1623                 if (rc == WAIT_TIMEOUT)
1624                         error("timer thread did not terminate timely");
1625                 else if (rc != WAIT_OBJECT_0)
1626                         error("waiting for timer thread failed: %lu",
1627                               GetLastError());
1628                 CloseHandle(timer_thread);
1629         }
1630         if (timer_event)
1631                 CloseHandle(timer_event);
1632         timer_event = NULL;
1633         timer_thread = NULL;
1634 }
1635
1636 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1637 {
1638         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1639 }
1640
1641 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1642 {
1643         static const struct timeval zero;
1644         static int atexit_done;
1645
1646         if (out != NULL)
1647                 return errno = EINVAL,
1648                         error("setitimer param 3 != NULL not implemented");
1649         if (!is_timeval_eq(&in->it_interval, &zero) &&
1650             !is_timeval_eq(&in->it_interval, &in->it_value))
1651                 return errno = EINVAL,
1652                         error("setitimer: it_interval must be zero or eq it_value");
1653
1654         if (timer_thread)
1655                 stop_timer_thread();
1656
1657         if (is_timeval_eq(&in->it_value, &zero) &&
1658             is_timeval_eq(&in->it_interval, &zero))
1659                 return 0;
1660
1661         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1662         one_shot = is_timeval_eq(&in->it_interval, &zero);
1663         if (!atexit_done) {
1664                 atexit(stop_timer_thread);
1665                 atexit_done = 1;
1666         }
1667         return start_timer_thread();
1668 }
1669
1670 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1671 {
1672         if (sig != SIGALRM)
1673                 return errno = EINVAL,
1674                         error("sigaction only implemented for SIGALRM");
1675         if (out != NULL)
1676                 return errno = EINVAL,
1677                         error("sigaction: param 3 != NULL not implemented");
1678
1679         timer_fn = in->sa_handler;
1680         return 0;
1681 }
1682
1683 #undef signal
1684 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1685 {
1686         sig_handler_t old;
1687
1688         switch (sig) {
1689         case SIGALRM:
1690                 old = timer_fn;
1691                 timer_fn = handler;
1692                 break;
1693
1694         case SIGINT:
1695                 old = sigint_fn;
1696                 sigint_fn = handler;
1697                 break;
1698
1699         default:
1700                 return signal(sig, handler);
1701         }
1702
1703         return old;
1704 }
1705
1706 #undef raise
1707 int mingw_raise(int sig)
1708 {
1709         switch (sig) {
1710         case SIGALRM:
1711                 if (timer_fn == SIG_DFL) {
1712                         if (isatty(STDERR_FILENO))
1713                                 fputs("Alarm clock\n", stderr);
1714                         exit(128 + SIGALRM);
1715                 } else if (timer_fn != SIG_IGN)
1716                         timer_fn(SIGALRM);
1717                 return 0;
1718
1719         case SIGINT:
1720                 if (sigint_fn == SIG_DFL)
1721                         exit(128 + SIGINT);
1722                 else if (sigint_fn != SIG_IGN)
1723                         sigint_fn(SIGINT);
1724                 return 0;
1725
1726         default:
1727                 return raise(sig);
1728         }
1729 }
1730
1731
1732 static const char *make_backslash_path(const char *path)
1733 {
1734         static char buf[PATH_MAX + 1];
1735         char *c;
1736
1737         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1738                 die("Too long path: %.*s", 60, path);
1739
1740         for (c = buf; *c; c++) {
1741                 if (*c == '/')
1742                         *c = '\\';
1743         }
1744         return buf;
1745 }
1746
1747 void mingw_open_html(const char *unixpath)
1748 {
1749         const char *htmlpath = make_backslash_path(unixpath);
1750         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1751                         const char *, const char *, const char *, INT);
1752         T ShellExecute;
1753         HMODULE shell32;
1754         int r;
1755
1756         shell32 = LoadLibrary("shell32.dll");
1757         if (!shell32)
1758                 die("cannot load shell32.dll");
1759         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1760         if (!ShellExecute)
1761                 die("cannot run browser");
1762
1763         printf("Launching default browser to display HTML ...\n");
1764         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1765         FreeLibrary(shell32);
1766         /* see the MSDN documentation referring to the result codes here */
1767         if (r <= 32) {
1768                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1769         }
1770 }
1771
1772 int link(const char *oldpath, const char *newpath)
1773 {
1774         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1775         static T create_hard_link = NULL;
1776         if (!create_hard_link) {
1777                 create_hard_link = (T) GetProcAddress(
1778                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1779                 if (!create_hard_link)
1780                         create_hard_link = (T)-1;
1781         }
1782         if (create_hard_link == (T)-1) {
1783                 errno = ENOSYS;
1784                 return -1;
1785         }
1786         if (!create_hard_link(newpath, oldpath, NULL)) {
1787                 errno = err_win_to_posix(GetLastError());
1788                 return -1;
1789         }
1790         return 0;
1791 }
1792
1793 pid_t waitpid(pid_t pid, int *status, int options)
1794 {
1795         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1796             FALSE, pid);
1797         if (!h) {
1798                 errno = ECHILD;
1799                 return -1;
1800         }
1801
1802         if (pid > 0 && options & WNOHANG) {
1803                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1804                         CloseHandle(h);
1805                         return 0;
1806                 }
1807                 options &= ~WNOHANG;
1808         }
1809
1810         if (options == 0) {
1811                 struct pinfo_t **ppinfo;
1812                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1813                         CloseHandle(h);
1814                         return 0;
1815                 }
1816
1817                 if (status)
1818                         GetExitCodeProcess(h, (LPDWORD)status);
1819
1820                 EnterCriticalSection(&pinfo_cs);
1821
1822                 ppinfo = &pinfo;
1823                 while (*ppinfo) {
1824                         struct pinfo_t *info = *ppinfo;
1825                         if (info->pid == pid) {
1826                                 CloseHandle(info->proc);
1827                                 *ppinfo = info->next;
1828                                 free(info);
1829                                 break;
1830                         }
1831                         ppinfo = &info->next;
1832                 }
1833
1834                 LeaveCriticalSection(&pinfo_cs);
1835
1836                 CloseHandle(h);
1837                 return pid;
1838         }
1839         CloseHandle(h);
1840
1841         errno = EINVAL;
1842         return -1;
1843 }