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