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