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                         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 #undef fflush
 339 int mingw_fflush(FILE *stream)
 340 {
 341         int ret = fflush(stream);
 342
 343         /*
 344          * write() is used behind the scenes of stdio output functions.
 345          * Since git code does not check for errors after each stdio write
 346          * operation, it can happen that write() is called by a later
 347          * stdio function even if an earlier write() call failed. In the
 348          * case of a pipe whose readable end was closed, only the first
 349          * call to write() reports EPIPE on Windows. Subsequent write()
 350          * calls report EINVAL. It is impossible to notice whether this
 351          * fflush invocation triggered such a case, therefore, we have to
 352          * catch all EINVAL errors whole-sale.
 353          */
 354         if (ret && errno == EINVAL)
 355                 errno = EPIPE;
 356
 357         return ret;
 358 }
 359
 360 /*
 361  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 362  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 363  */
 364 static inline long long filetime_to_hnsec(const FILETIME *ft)
 365 {
 366         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 367         /* Windows to Unix Epoch conversion */
 368         return winTime - 116444736000000000LL;
 369 }
 370
 371 static inline time_t filetime_to_time_t(const FILETIME *ft)
 372 {
 373         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 374 }
 375
 376 /* We keep the do_lstat code in a separate function to avoid recursion.
 377  * When a path ends with a slash, the stat will fail with ENOENT. In
 378  * this case, we strip the trailing slashes and stat again.
 379  *
 380  * If follow is true then act like stat() and report on the link
 381  * target. Otherwise report on the link itself.
 382  */
 383 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 384 {
 385         int err;
 386         WIN32_FILE_ATTRIBUTE_DATA fdata;
 387
 388         if (!(err = get_file_attr(file_name, &fdata))) {
 389                 buf->st_ino = 0;
 390                 buf->st_gid = 0;
 391                 buf->st_uid = 0;
 392                 buf->st_nlink = 1;
 393                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 394                 buf->st_size = fdata.nFileSizeLow |
 395                         (((off_t)fdata.nFileSizeHigh)<<32);
 396                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 397                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 398                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 399                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 400                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 401                         WIN32_FIND_DATAA findbuf;
 402                         HANDLE handle = FindFirstFileA(file_name, &findbuf);
 403                         if (handle != INVALID_HANDLE_VALUE) {
 404                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 405                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 406                                         if (follow) {
 407                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 408                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 409                                         } else {
 410                                                 buf->st_mode = S_IFLNK;
 411                                         }
 412                                         buf->st_mode |= S_IREAD;
 413                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 414                                                 buf->st_mode |= S_IWRITE;
 415                                 }
 416                                 FindClose(handle);
 417                         }
 418                 }
 419                 return 0;
 420         }
 421         errno = err;
 422         return -1;
 423 }
 424
 425 /* We provide our own lstat/fstat functions, since the provided
 426  * lstat/fstat functions are so slow. These stat functions are
 427  * tailored for Git's usage (read: fast), and are not meant to be
 428  * complete. Note that Git stat()s are redirected to mingw_lstat()
 429  * too, since Windows doesn't really handle symlinks that well.
 430  */
 431 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 432 {
 433         int namelen;
 434         static char alt_name[PATH_MAX];
 435
 436         if (!do_lstat(follow, file_name, buf))
 437                 return 0;
 438
 439         /* if file_name ended in a '/', Windows returned ENOENT;
 440          * try again without trailing slashes
 441          */
 442         if (errno != ENOENT)
 443                 return -1;
 444
 445         namelen = strlen(file_name);
 446         if (namelen && file_name[namelen-1] != '/')
 447                 return -1;
 448         while (namelen && file_name[namelen-1] == '/')
 449                 --namelen;
 450         if (!namelen || namelen >= PATH_MAX)
 451                 return -1;
 452
 453         memcpy(alt_name, file_name, namelen);
 454         alt_name[namelen] = 0;
 455         return do_lstat(follow, alt_name, buf);
 456 }
 457
 458 int mingw_lstat(const char *file_name, struct stat *buf)
 459 {
 460         return do_stat_internal(0, file_name, buf);
 461 }
 462 int mingw_stat(const char *file_name, struct stat *buf)
 463 {
 464         return do_stat_internal(1, file_name, buf);
 465 }
 466
 467 #undef fstat
 468 int mingw_fstat(int fd, struct stat *buf)
 469 {
 470         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 471         BY_HANDLE_FILE_INFORMATION fdata;
 472
 473         if (fh == INVALID_HANDLE_VALUE) {
 474                 errno = EBADF;
 475                 return -1;
 476         }
 477         /* direct non-file handles to MS's fstat() */
 478         if (GetFileType(fh) != FILE_TYPE_DISK)
 479                 return _fstati64(fd, buf);
 480
 481         if (GetFileInformationByHandle(fh, &fdata)) {
 482                 buf->st_ino = 0;
 483                 buf->st_gid = 0;
 484                 buf->st_uid = 0;
 485                 buf->st_nlink = 1;
 486                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 487                 buf->st_size = fdata.nFileSizeLow |
 488                         (((off_t)fdata.nFileSizeHigh)<<32);
 489                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 490                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 491                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 492                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 493                 return 0;
 494         }
 495         errno = EBADF;
 496         return -1;
 497 }
 498
 499 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 500 {
 501         long long winTime = t * 10000000LL + 116444736000000000LL;
 502         ft->dwLowDateTime = winTime;
 503         ft->dwHighDateTime = winTime >> 32;
 504 }
 505
 506 int mingw_utime (const char *file_name, const struct utimbuf *times)
 507 {
 508         FILETIME mft, aft;
 509         int fh, rc;
 510
 511         /* must have write permission */
 512         DWORD attrs = GetFileAttributes(file_name);
 513         if (attrs != INVALID_FILE_ATTRIBUTES &&
 514             (attrs & FILE_ATTRIBUTE_READONLY)) {
 515                 /* ignore errors here; open() will report them */
 516                 SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 517         }
 518
 519         if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 520                 rc = -1;
 521                 goto revert_attrs;
 522         }
 523
 524         if (times) {
 525                 time_t_to_filetime(times->modtime, &mft);
 526                 time_t_to_filetime(times->actime, &aft);
 527         } else {
 528                 GetSystemTimeAsFileTime(&mft);
 529                 aft = mft;
 530         }
 531         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 532                 errno = EINVAL;
 533                 rc = -1;
 534         } else
 535                 rc = 0;
 536         close(fh);
 537
 538 revert_attrs:
 539         if (attrs != INVALID_FILE_ATTRIBUTES &&
 540             (attrs & FILE_ATTRIBUTE_READONLY)) {
 541                 /* ignore errors again */
 542                 SetFileAttributes(file_name, attrs);
 543         }
 544         return rc;
 545 }
 546
 547 unsigned int sleep (unsigned int seconds)
 548 {
 549         Sleep(seconds*1000);
 550         return 0;
 551 }
 552
 553 int mkstemp(char *template)
 554 {
 555         char *filename = mktemp(template);
 556         if (filename == NULL)
 557                 return -1;
 558         return open(filename, O_RDWR | O_CREAT, 0600);
 559 }
 560
 561 int gettimeofday(struct timeval *tv, void *tz)
 562 {
 563         FILETIME ft;
 564         long long hnsec;
 565
 566         GetSystemTimeAsFileTime(&ft);
 567         hnsec = filetime_to_hnsec(&ft);
 568         tv->tv_sec = hnsec / 10000000;
 569         tv->tv_usec = (hnsec % 10000000) / 10;
 570         return 0;
 571 }
 572
 573 int pipe(int filedes[2])
 574 {
 575         HANDLE h[2];
 576
 577         /* this creates non-inheritable handles */
 578         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 579                 errno = err_win_to_posix(GetLastError());
 580                 return -1;
 581         }
 582         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 583         if (filedes[0] < 0) {
 584                 CloseHandle(h[0]);
 585                 CloseHandle(h[1]);
 586                 return -1;
 587         }
 588         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 589         if (filedes[0] < 0) {
 590                 close(filedes[0]);
 591                 CloseHandle(h[1]);
 592                 return -1;
 593         }
 594         return 0;
 595 }
 596
 597 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 598 {
 599         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 600         memcpy(result, gmtime(timep), sizeof(struct tm));
 601         return result;
 602 }
 603
 604 struct tm *localtime_r(const time_t *timep, struct tm *result)
 605 {
 606         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 607         memcpy(result, localtime(timep), sizeof(struct tm));
 608         return result;
 609 }
 610
 611 #undef getcwd
 612 char *mingw_getcwd(char *pointer, int len)
 613 {
 614         int i;
 615         char *ret = getcwd(pointer, len);
 616         if (!ret)
 617                 return ret;
 618         for (i = 0; pointer[i]; i++)
 619                 if (pointer[i] == '\\')
 620                         pointer[i] = '/';
 621         return ret;
 622 }
 623
 624 /*
 625  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 626  * (Parsing C++ Command-Line Arguments)
 627  */
 628 static const char *quote_arg(const char *arg)
 629 {
 630         /* count chars to quote */
 631         int len = 0, n = 0;
 632         int force_quotes = 0;
 633         char *q, *d;
 634         const char *p = arg;
 635         if (!*p) force_quotes = 1;
 636         while (*p) {
 637                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 638                         force_quotes = 1;
 639                 else if (*p == '"')
 640                         n++;
 641                 else if (*p == '\\') {
 642                         int count = 0;
 643                         while (*p == '\\') {
 644                                 count++;
 645                                 p++;
 646                                 len++;
 647                         }
 648                         if (*p == '"')
 649                                 n += count*2 + 1;
 650                         continue;
 651                 }
 652                 len++;
 653                 p++;
 654         }
 655         if (!force_quotes && n == 0)
 656                 return arg;
 657
 658         /* insert \ where necessary */
 659         d = q = xmalloc(len+n+3);
 660         *d++ = '"';
 661         while (*arg) {
 662                 if (*arg == '"')
 663                         *d++ = '\\';
 664                 else if (*arg == '\\') {
 665                         int count = 0;
 666                         while (*arg == '\\') {
 667                                 count++;
 668                                 *d++ = *arg++;
 669                         }
 670                         if (*arg == '"') {
 671                                 while (count-- > 0)
 672                                         *d++ = '\\';
 673                                 *d++ = '\\';
 674                         }
 675                 }
 676                 *d++ = *arg++;
 677         }
 678         *d++ = '"';
 679         *d++ = 0;
 680         return q;
 681 }
 682
 683 static const char *parse_interpreter(const char *cmd)
 684 {
 685         static char buf[100];
 686         char *p, *opt;
 687         int n, fd;
 688
 689         /* don't even try a .exe */
 690         n = strlen(cmd);
 691         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 692                 return NULL;
 693
 694         fd = open(cmd, O_RDONLY);
 695         if (fd < 0)
 696                 return NULL;
 697         n = read(fd, buf, sizeof(buf)-1);
 698         close(fd);
 699         if (n < 4)      /* at least '#!/x' and not error */
 700                 return NULL;
 701
 702         if (buf[0] != '#' || buf[1] != '!')
 703                 return NULL;
 704         buf[n] = '\0';
 705         p = buf + strcspn(buf, "\r\n");
 706         if (!*p)
 707                 return NULL;
 708
 709         *p = '\0';
 710         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 711                 return NULL;
 712         /* strip options */
 713         if ((opt = strchr(p+1, ' ')))
 714                 *opt = '\0';
 715         return p+1;
 716 }
 717
 718 /*
 719  * Splits the PATH into parts.
 720  */
 721 static char **get_path_split(void)
 722 {
 723         char *p, **path, *envpath = mingw_getenv("PATH");
 724         int i, n = 0;
 725
 726         if (!envpath || !*envpath)
 727                 return NULL;
 728
 729         envpath = xstrdup(envpath);
 730         p = envpath;
 731         while (p) {
 732                 char *dir = p;
 733                 p = strchr(p, ';');
 734                 if (p) *p++ = '\0';
 735                 if (*dir) {     /* not earlier, catches series of ; */
 736                         ++n;
 737                 }
 738         }
 739         if (!n)
 740                 return NULL;
 741
 742         path = xmalloc((n+1)*sizeof(char *));
 743         p = envpath;
 744         i = 0;
 745         do {
 746                 if (*p)
 747                         path[i++] = xstrdup(p);
 748                 p = p+strlen(p)+1;
 749         } while (i < n);
 750         path[i] = NULL;
 751
 752         free(envpath);
 753
 754         return path;
 755 }
 756
 757 static void free_path_split(char **path)
 758 {
 759         char **p = path;
 760
 761         if (!path)
 762                 return;
 763
 764         while (*p)
 765                 free(*p++);
 766         free(path);
 767 }
 768
 769 /*
 770  * exe_only means that we only want to detect .exe files, but not scripts
 771  * (which do not have an extension)
 772  */
 773 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 774 {
 775         char path[MAX_PATH];
 776         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 777
 778         if (!isexe && access(path, F_OK) == 0)
 779                 return xstrdup(path);
 780         path[strlen(path)-4] = '\0';
 781         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 782                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 783                         return xstrdup(path);
 784         return NULL;
 785 }
 786
 787 /*
 788  * Determines the absolute path of cmd using the split path in path.
 789  * If cmd contains a slash or backslash, no lookup is performed.
 790  */
 791 static char *path_lookup(const char *cmd, char **path, int exe_only)
 792 {
 793         char *prog = NULL;
 794         int len = strlen(cmd);
 795         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 796
 797         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 798                 prog = xstrdup(cmd);
 799
 800         while (!prog && *path)
 801                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 802
 803         return prog;
 804 }
 805
 806 static int env_compare(const void *a, const void *b)
 807 {
 808         char *const *ea = a;
 809         char *const *eb = b;
 810         return strcasecmp(*ea, *eb);
 811 }
 812
 813 struct pinfo_t {
 814         struct pinfo_t *next;
 815         pid_t pid;
 816         HANDLE proc;
 817 } pinfo_t;
 818 struct pinfo_t *pinfo = NULL;
 819 CRITICAL_SECTION pinfo_cs;
 820
 821 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 822                               const char *dir,
 823                               int prepend_cmd, int fhin, int fhout, int fherr)
 824 {
 825         STARTUPINFO si;
 826         PROCESS_INFORMATION pi;
 827         struct strbuf envblk, args;
 828         unsigned flags;
 829         BOOL ret;
 830
 831         /* Determine whether or not we are associated to a console */
 832         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 833                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 834                         FILE_ATTRIBUTE_NORMAL, NULL);
 835         if (cons == INVALID_HANDLE_VALUE) {
 836                 /* There is no console associated with this process.
 837                  * Since the child is a console process, Windows
 838                  * would normally create a console window. But
 839                  * since we'll be redirecting std streams, we do
 840                  * not need the console.
 841                  * It is necessary to use DETACHED_PROCESS
 842                  * instead of CREATE_NO_WINDOW to make ssh
 843                  * recognize that it has no console.
 844                  */
 845                 flags = DETACHED_PROCESS;
 846         } else {
 847                 /* There is already a console. If we specified
 848                  * DETACHED_PROCESS here, too, Windows would
 849                  * disassociate the child from the console.
 850                  * The same is true for CREATE_NO_WINDOW.
 851                  * Go figure!
 852                  */
 853                 flags = 0;
 854                 CloseHandle(cons);
 855         }
 856         memset(&si, 0, sizeof(si));
 857         si.cb = sizeof(si);
 858         si.dwFlags = STARTF_USESTDHANDLES;
 859         si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 860         si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 861         si.hStdError = (HANDLE) _get_osfhandle(fherr);
 862
 863         /* concatenate argv, quoting args as we go */
 864         strbuf_init(&args, 0);
 865         if (prepend_cmd) {
 866                 char *quoted = (char *)quote_arg(cmd);
 867                 strbuf_addstr(&args, quoted);
 868                 if (quoted != cmd)
 869                         free(quoted);
 870         }
 871         for (; *argv; argv++) {
 872                 char *quoted = (char *)quote_arg(*argv);
 873                 if (*args.buf)
 874                         strbuf_addch(&args, ' ');
 875                 strbuf_addstr(&args, quoted);
 876                 if (quoted != *argv)
 877                         free(quoted);
 878         }
 879
 880         if (env) {
 881                 int count = 0;
 882                 char **e, **sorted_env;
 883
 884                 for (e = env; *e; e++)
 885                         count++;
 886
 887                 /* environment must be sorted */
 888                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 889                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 890                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 891
 892                 strbuf_init(&envblk, 0);
 893                 for (e = sorted_env; *e; e++) {
 894                         strbuf_addstr(&envblk, *e);
 895                         strbuf_addch(&envblk, '\0');
 896                 }
 897                 free(sorted_env);
 898         }
 899
 900         memset(&pi, 0, sizeof(pi));
 901         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 902                 env ? envblk.buf : NULL, dir, &si, &pi);
 903
 904         if (env)
 905                 strbuf_release(&envblk);
 906         strbuf_release(&args);
 907
 908         if (!ret) {
 909                 errno = ENOENT;
 910                 return -1;
 911         }
 912         CloseHandle(pi.hThread);
 913
 914         /*
 915          * The process ID is the human-readable identifier of the process
 916          * that we want to present in log and error messages. The handle
 917          * is not useful for this purpose. But we cannot close it, either,
 918          * because it is not possible to turn a process ID into a process
 919          * handle after the process terminated.
 920          * Keep the handle in a list for waitpid.
 921          */
 922         EnterCriticalSection(&pinfo_cs);
 923         {
 924                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
 925                 info->pid = pi.dwProcessId;
 926                 info->proc = pi.hProcess;
 927                 info->next = pinfo;
 928                 pinfo = info;
 929         }
 930         LeaveCriticalSection(&pinfo_cs);
 931
 932         return (pid_t)pi.dwProcessId;
 933 }
 934
 935 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 936                            int prepend_cmd)
 937 {
 938         return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 939 }
 940
 941 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 942                      const char *dir,
 943                      int fhin, int fhout, int fherr)
 944 {
 945         pid_t pid;
 946         char **path = get_path_split();
 947         char *prog = path_lookup(cmd, path, 0);
 948
 949         if (!prog) {
 950                 errno = ENOENT;
 951                 pid = -1;
 952         }
 953         else {
 954                 const char *interpr = parse_interpreter(prog);
 955
 956                 if (interpr) {
 957                         const char *argv0 = argv[0];
 958                         char *iprog = path_lookup(interpr, path, 1);
 959                         argv[0] = prog;
 960                         if (!iprog) {
 961                                 errno = ENOENT;
 962                                 pid = -1;
 963                         }
 964                         else {
 965                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 966                                                        fhin, fhout, fherr);
 967                                 free(iprog);
 968                         }
 969                         argv[0] = argv0;
 970                 }
 971                 else
 972                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
 973                                                fhin, fhout, fherr);
 974                 free(prog);
 975         }
 976         free_path_split(path);
 977         return pid;
 978 }
 979
 980 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 981 {
 982         const char *interpr = parse_interpreter(cmd);
 983         char **path;
 984         char *prog;
 985         int pid = 0;
 986
 987         if (!interpr)
 988                 return 0;
 989         path = get_path_split();
 990         prog = path_lookup(interpr, path, 1);
 991         if (prog) {
 992                 int argc = 0;
 993                 const char **argv2;
 994                 while (argv[argc]) argc++;
 995                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
 996                 argv2[0] = (char *)cmd; /* full path to the script file */
 997                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 998                 pid = mingw_spawnve(prog, argv2, env, 1);
 999                 if (pid >= 0) {
1000                         int status;
1001                         if (waitpid(pid, &status, 0) < 0)
1002                                 status = 255;
1003                         exit(status);
1004                 }
1005                 pid = 1;        /* indicate that we tried but failed */
1006                 free(prog);
1007                 free(argv2);
1008         }
1009         free_path_split(path);
1010         return pid;
1011 }
1012
1013 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
1014 {
1015         /* check if git_command is a shell script */
1016         if (!try_shell_exec(cmd, argv, (char **)env)) {
1017                 int pid, status;
1018
1019                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
1020                 if (pid < 0)
1021                         return;
1022                 if (waitpid(pid, &status, 0) < 0)
1023                         status = 255;
1024                 exit(status);
1025         }
1026 }
1027
1028 int mingw_execvp(const char *cmd, char *const *argv)
1029 {
1030         char **path = get_path_split();
1031         char *prog = path_lookup(cmd, path, 0);
1032
1033         if (prog) {
1034                 mingw_execve(prog, argv, environ);
1035                 free(prog);
1036         } else
1037                 errno = ENOENT;
1038
1039         free_path_split(path);
1040         return -1;
1041 }
1042
1043 int mingw_execv(const char *cmd, char *const *argv)
1044 {
1045         mingw_execve(cmd, argv, environ);
1046         return -1;
1047 }
1048
1049 int mingw_kill(pid_t pid, int sig)
1050 {
1051         if (pid > 0 && sig == SIGTERM) {
1052                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1053
1054                 if (TerminateProcess(h, -1)) {
1055                         CloseHandle(h);
1056                         return 0;
1057                 }
1058
1059                 errno = err_win_to_posix(GetLastError());
1060                 CloseHandle(h);
1061                 return -1;
1062         }
1063
1064         errno = EINVAL;
1065         return -1;
1066 }
1067
1068 static char **copy_environ(void)
1069 {
1070         char **env;
1071         int i = 0;
1072         while (environ[i])
1073                 i++;
1074         env = xmalloc((i+1)*sizeof(*env));
1075         for (i = 0; environ[i]; i++)
1076                 env[i] = xstrdup(environ[i]);
1077         env[i] = NULL;
1078         return env;
1079 }
1080
1081 void free_environ(char **env)
1082 {
1083         int i;
1084         for (i = 0; env[i]; i++)
1085                 free(env[i]);
1086         free(env);
1087 }
1088
1089 static int lookup_env(char **env, const char *name, size_t nmln)
1090 {
1091         int i;
1092
1093         for (i = 0; env[i]; i++) {
1094                 if (0 == strncmp(env[i], name, nmln)
1095                     && '=' == env[i][nmln])
1096                         /* matches */
1097                         return i;
1098         }
1099         return -1;
1100 }
1101
1102 /*
1103  * If name contains '=', then sets the variable, otherwise it unsets it
1104  */
1105 static char **env_setenv(char **env, const char *name)
1106 {
1107         char *eq = strchrnul(name, '=');
1108         int i = lookup_env(env, name, eq-name);
1109
1110         if (i < 0) {
1111                 if (*eq) {
1112                         for (i = 0; env[i]; i++)
1113                                 ;
1114                         env = xrealloc(env, (i+2)*sizeof(*env));
1115                         env[i] = xstrdup(name);
1116                         env[i+1] = NULL;
1117                 }
1118         }
1119         else {
1120                 free(env[i]);
1121                 if (*eq)
1122                         env[i] = xstrdup(name);
1123                 else
1124                         for (; env[i]; i++)
1125                                 env[i] = env[i+1];
1126         }
1127         return env;
1128 }
1129
1130 /*
1131  * Copies global environ and adjusts variables as specified by vars.
1132  */
1133 char **make_augmented_environ(const char *const *vars)
1134 {
1135         char **env = copy_environ();
1136
1137         while (*vars)
1138                 env = env_setenv(env, *vars++);
1139         return env;
1140 }
1141
1142 #undef getenv
1143
1144 /*
1145  * The system's getenv looks up the name in a case-insensitive manner.
1146  * This version tries a case-sensitive lookup and falls back to
1147  * case-insensitive if nothing was found.  This is necessary because,
1148  * as a prominent example, CMD sets 'Path', but not 'PATH'.
1149  * Warning: not thread-safe.
1150  */
1151 static char *getenv_cs(const char *name)
1152 {
1153         size_t len = strlen(name);
1154         int i = lookup_env(environ, name, len);
1155         if (i >= 0)
1156                 return environ[i] + len + 1;    /* skip past name and '=' */
1157         return getenv(name);
1158 }
1159
1160 char *mingw_getenv(const char *name)
1161 {
1162         char *result = getenv_cs(name);
1163         if (!result && !strcmp(name, "TMPDIR")) {
1164                 /* on Windows it is TMP and TEMP */
1165                 result = getenv_cs("TMP");
1166                 if (!result)
1167                         result = getenv_cs("TEMP");
1168         }
1169         return result;
1170 }
1171
1172 /*
1173  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1174  * that service contains a numerical port, or that it is null. It
1175  * does a simple search using gethostbyname, and returns one IPv4 host
1176  * if one was found.
1177  */
1178 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1179                                    const struct addrinfo *hints,
1180                                    struct addrinfo **res)
1181 {
1182         struct hostent *h = NULL;
1183         struct addrinfo *ai;
1184         struct sockaddr_in *sin;
1185
1186         if (node) {
1187                 h = gethostbyname(node);
1188                 if (!h)
1189                         return WSAGetLastError();
1190         }
1191
1192         ai = xmalloc(sizeof(struct addrinfo));
1193         *res = ai;
1194         ai->ai_flags = 0;
1195         ai->ai_family = AF_INET;
1196         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1197         switch (ai->ai_socktype) {
1198         case SOCK_STREAM:
1199                 ai->ai_protocol = IPPROTO_TCP;
1200                 break;
1201         case SOCK_DGRAM:
1202                 ai->ai_protocol = IPPROTO_UDP;
1203                 break;
1204         default:
1205                 ai->ai_protocol = 0;
1206                 break;
1207         }
1208         ai->ai_addrlen = sizeof(struct sockaddr_in);
1209         if (hints && (hints->ai_flags & AI_CANONNAME))
1210                 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1211         else
1212                 ai->ai_canonname = NULL;
1213
1214         sin = xmalloc(ai->ai_addrlen);
1215         memset(sin, 0, ai->ai_addrlen);
1216         sin->sin_family = AF_INET;
1217         /* Note: getaddrinfo is supposed to allow service to be a string,
1218          * which should be looked up using getservbyname. This is
1219          * currently not implemented */
1220         if (service)
1221                 sin->sin_port = htons(atoi(service));
1222         if (h)
1223                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1224         else if (hints && (hints->ai_flags & AI_PASSIVE))
1225                 sin->sin_addr.s_addr = INADDR_ANY;
1226         else
1227                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1228         ai->ai_addr = (struct sockaddr *)sin;
1229         ai->ai_next = 0;
1230         return 0;
1231 }
1232
1233 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1234 {
1235         free(res->ai_canonname);
1236         free(res->ai_addr);
1237         free(res);
1238 }
1239
1240 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1241                                    char *host, DWORD hostlen,
1242                                    char *serv, DWORD servlen, int flags)
1243 {
1244         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1245         if (sa->sa_family != AF_INET)
1246                 return EAI_FAMILY;
1247         if (!host && !serv)
1248                 return EAI_NONAME;
1249
1250         if (host && hostlen > 0) {
1251                 struct hostent *ent = NULL;
1252                 if (!(flags & NI_NUMERICHOST))
1253                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1254                                             sizeof(sin->sin_addr), AF_INET);
1255
1256                 if (ent)
1257                         snprintf(host, hostlen, "%s", ent->h_name);
1258                 else if (flags & NI_NAMEREQD)
1259                         return EAI_NONAME;
1260                 else
1261                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1262         }
1263
1264         if (serv && servlen > 0) {
1265                 struct servent *ent = NULL;
1266                 if (!(flags & NI_NUMERICSERV))
1267                         ent = getservbyport(sin->sin_port,
1268                                             flags & NI_DGRAM ? "udp" : "tcp");
1269
1270                 if (ent)
1271                         snprintf(serv, servlen, "%s", ent->s_name);
1272                 else
1273                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1274         }
1275
1276         return 0;
1277 }
1278
1279 static HMODULE ipv6_dll = NULL;
1280 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1281 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1282                                       const struct addrinfo *hints,
1283                                       struct addrinfo **res);
1284 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1285                                       char *host, DWORD hostlen,
1286                                       char *serv, DWORD servlen, int flags);
1287 /*
1288  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1289  * don't need to try to load that one dynamically.
1290  */
1291
1292 static void socket_cleanup(void)
1293 {
1294         WSACleanup();
1295         if (ipv6_dll)
1296                 FreeLibrary(ipv6_dll);
1297         ipv6_dll = NULL;
1298         ipv6_freeaddrinfo = freeaddrinfo_stub;
1299         ipv6_getaddrinfo = getaddrinfo_stub;
1300         ipv6_getnameinfo = getnameinfo_stub;
1301 }
1302
1303 static void ensure_socket_initialization(void)
1304 {
1305         WSADATA wsa;
1306         static int initialized = 0;
1307         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1308         const char **name;
1309
1310         if (initialized)
1311                 return;
1312
1313         if (WSAStartup(MAKEWORD(2,2), &wsa))
1314                 die("unable to initialize winsock subsystem, error %d",
1315                         WSAGetLastError());
1316
1317         for (name = libraries; *name; name++) {
1318                 ipv6_dll = LoadLibrary(*name);
1319                 if (!ipv6_dll)
1320                         continue;
1321
1322                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1323                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1324                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1325                                                    const struct addrinfo *,
1326                                                    struct addrinfo **))
1327                         GetProcAddress(ipv6_dll, "getaddrinfo");
1328                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1329                                                    socklen_t, char *, DWORD,
1330                                                    char *, DWORD, int))
1331                         GetProcAddress(ipv6_dll, "getnameinfo");
1332                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1333                         FreeLibrary(ipv6_dll);
1334                         ipv6_dll = NULL;
1335                 } else
1336                         break;
1337         }
1338         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1339                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1340                 ipv6_getaddrinfo = getaddrinfo_stub;
1341                 ipv6_getnameinfo = getnameinfo_stub;
1342         }
1343
1344         atexit(socket_cleanup);
1345         initialized = 1;
1346 }
1347
1348 #undef gethostname
1349 int mingw_gethostname(char *name, int namelen)
1350 {
1351     ensure_socket_initialization();
1352     return gethostname(name, namelen);
1353 }
1354
1355 #undef gethostbyname
1356 struct hostent *mingw_gethostbyname(const char *host)
1357 {
1358         ensure_socket_initialization();
1359         return gethostbyname(host);
1360 }
1361
1362 void mingw_freeaddrinfo(struct addrinfo *res)
1363 {
1364         ipv6_freeaddrinfo(res);
1365 }
1366
1367 int mingw_getaddrinfo(const char *node, const char *service,
1368                       const struct addrinfo *hints, struct addrinfo **res)
1369 {
1370         ensure_socket_initialization();
1371         return ipv6_getaddrinfo(node, service, hints, res);
1372 }
1373
1374 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1375                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1376                       int flags)
1377 {
1378         ensure_socket_initialization();
1379         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1380 }
1381
1382 int mingw_socket(int domain, int type, int protocol)
1383 {
1384         int sockfd;
1385         SOCKET s;
1386
1387         ensure_socket_initialization();
1388         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1389         if (s == INVALID_SOCKET) {
1390                 /*
1391                  * WSAGetLastError() values are regular BSD error codes
1392                  * biased by WSABASEERR.
1393                  * However, strerror() does not know about networking
1394                  * specific errors, which are values beginning at 38 or so.
1395                  * Therefore, we choose to leave the biased error code
1396                  * in errno so that _if_ someone looks up the code somewhere,
1397                  * then it is at least the number that are usually listed.
1398                  */
1399                 errno = WSAGetLastError();
1400                 return -1;
1401         }
1402         /* convert into a file descriptor */
1403         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1404                 closesocket(s);
1405                 return error("unable to make a socket file descriptor: %s",
1406                         strerror(errno));
1407         }
1408         return sockfd;
1409 }
1410
1411 #undef connect
1412 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1413 {
1414         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1415         return connect(s, sa, sz);
1416 }
1417
1418 #undef bind
1419 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1420 {
1421         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1422         return bind(s, sa, sz);
1423 }
1424
1425 #undef setsockopt
1426 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1427 {
1428         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1429         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1430 }
1431
1432 #undef shutdown
1433 int mingw_shutdown(int sockfd, int how)
1434 {
1435         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1436         return shutdown(s, how);
1437 }
1438
1439 #undef listen
1440 int mingw_listen(int sockfd, int backlog)
1441 {
1442         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1443         return listen(s, backlog);
1444 }
1445
1446 #undef accept
1447 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1448 {
1449         int sockfd2;
1450
1451         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1452         SOCKET s2 = accept(s1, sa, sz);
1453
1454         /* convert into a file descriptor */
1455         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1456                 int err = errno;
1457                 closesocket(s2);
1458                 return error("unable to make a socket file descriptor: %s",
1459                         strerror(err));
1460         }
1461         return sockfd2;
1462 }
1463
1464 #undef rename
1465 int mingw_rename(const char *pold, const char *pnew)
1466 {
1467         DWORD attrs, gle;
1468         int tries = 0;
1469
1470         /*
1471          * Try native rename() first to get errno right.
1472          * It is based on MoveFile(), which cannot overwrite existing files.
1473          */
1474         if (!rename(pold, pnew))
1475                 return 0;
1476         if (errno != EEXIST)
1477                 return -1;
1478 repeat:
1479         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1480                 return 0;
1481         /* TODO: translate more errors */
1482         gle = GetLastError();
1483         if (gle == ERROR_ACCESS_DENIED &&
1484             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1485                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1486                         errno = EISDIR;
1487                         return -1;
1488                 }
1489                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1490                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1491                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1492                                 return 0;
1493                         gle = GetLastError();
1494                         /* revert file attributes on failure */
1495                         SetFileAttributes(pnew, attrs);
1496                 }
1497         }
1498         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1499                 /*
1500                  * We assume that some other process had the source or
1501                  * destination file open at the wrong moment and retry.
1502                  * In order to give the other process a higher chance to
1503                  * complete its operation, we give up our time slice now.
1504                  * If we have to retry again, we do sleep a bit.
1505                  */
1506                 Sleep(delay[tries]);
1507                 tries++;
1508                 goto repeat;
1509         }
1510         if (gle == ERROR_ACCESS_DENIED &&
1511                ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1512                        "Should I try again?", pold, pnew))
1513                 goto repeat;
1514
1515         errno = EACCES;
1516         return -1;
1517 }
1518
1519 /*
1520  * Note that this doesn't return the actual pagesize, but
1521  * the allocation granularity. If future Windows specific git code
1522  * needs the real getpagesize function, we need to find another solution.
1523  */
1524 int mingw_getpagesize(void)
1525 {
1526         SYSTEM_INFO si;
1527         GetSystemInfo(&si);
1528         return si.dwAllocationGranularity;
1529 }
1530
1531 struct passwd *getpwuid(int uid)
1532 {
1533         static char user_name[100];
1534         static struct passwd p;
1535
1536         DWORD len = sizeof(user_name);
1537         if (!GetUserName(user_name, &len))
1538                 return NULL;
1539         p.pw_name = user_name;
1540         p.pw_gecos = "unknown";
1541         p.pw_dir = NULL;
1542         return &p;
1543 }
1544
1545 static HANDLE timer_event;
1546 static HANDLE timer_thread;
1547 static int timer_interval;
1548 static int one_shot;
1549 static sig_handler_t timer_fn = SIG_DFL;
1550
1551 /* The timer works like this:
1552  * The thread, ticktack(), is a trivial routine that most of the time
1553  * only waits to receive the signal to terminate. The main thread tells
1554  * the thread to terminate by setting the timer_event to the signalled
1555  * state.
1556  * But ticktack() interrupts the wait state after the timer's interval
1557  * length to call the signal handler.
1558  */
1559
1560 static unsigned __stdcall ticktack(void *dummy)
1561 {
1562         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1563                 if (timer_fn == SIG_DFL) {
1564                         if (isatty(STDERR_FILENO))
1565                                 fputs("Alarm clock\n", stderr);
1566                         exit(128 + SIGALRM);
1567                 }
1568                 if (timer_fn != SIG_IGN)
1569                         timer_fn(SIGALRM);
1570                 if (one_shot)
1571                         break;
1572         }
1573         return 0;
1574 }
1575
1576 static int start_timer_thread(void)
1577 {
1578         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1579         if (timer_event) {
1580                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1581                 if (!timer_thread )
1582                         return errno = ENOMEM,
1583                                 error("cannot start timer thread");
1584         } else
1585                 return errno = ENOMEM,
1586                         error("cannot allocate resources for timer");
1587         return 0;
1588 }
1589
1590 static void stop_timer_thread(void)
1591 {
1592         if (timer_event)
1593                 SetEvent(timer_event);  /* tell thread to terminate */
1594         if (timer_thread) {
1595                 int rc = WaitForSingleObject(timer_thread, 1000);
1596                 if (rc == WAIT_TIMEOUT)
1597                         error("timer thread did not terminate timely");
1598                 else if (rc != WAIT_OBJECT_0)
1599                         error("waiting for timer thread failed: %lu",
1600                               GetLastError());
1601                 CloseHandle(timer_thread);
1602         }
1603         if (timer_event)
1604                 CloseHandle(timer_event);
1605         timer_event = NULL;
1606         timer_thread = NULL;
1607 }
1608
1609 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1610 {
1611         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1612 }
1613
1614 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1615 {
1616         static const struct timeval zero;
1617         static int atexit_done;
1618
1619         if (out != NULL)
1620                 return errno = EINVAL,
1621                         error("setitimer param 3 != NULL not implemented");
1622         if (!is_timeval_eq(&in->it_interval, &zero) &&
1623             !is_timeval_eq(&in->it_interval, &in->it_value))
1624                 return errno = EINVAL,
1625                         error("setitimer: it_interval must be zero or eq it_value");
1626
1627         if (timer_thread)
1628                 stop_timer_thread();
1629
1630         if (is_timeval_eq(&in->it_value, &zero) &&
1631             is_timeval_eq(&in->it_interval, &zero))
1632                 return 0;
1633
1634         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1635         one_shot = is_timeval_eq(&in->it_interval, &zero);
1636         if (!atexit_done) {
1637                 atexit(stop_timer_thread);
1638                 atexit_done = 1;
1639         }
1640         return start_timer_thread();
1641 }
1642
1643 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1644 {
1645         if (sig != SIGALRM)
1646                 return errno = EINVAL,
1647                         error("sigaction only implemented for SIGALRM");
1648         if (out != NULL)
1649                 return errno = EINVAL,
1650                         error("sigaction: param 3 != NULL not implemented");
1651
1652         timer_fn = in->sa_handler;
1653         return 0;
1654 }
1655
1656 #undef signal
1657 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1658 {
1659         sig_handler_t old = timer_fn;
1660         if (sig != SIGALRM)
1661                 return signal(sig, handler);
1662         timer_fn = handler;
1663         return old;
1664 }
1665
1666 static const char *make_backslash_path(const char *path)
1667 {
1668         static char buf[PATH_MAX + 1];
1669         char *c;
1670
1671         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1672                 die("Too long path: %.*s", 60, path);
1673
1674         for (c = buf; *c; c++) {
1675                 if (*c == '/')
1676                         *c = '\\';
1677         }
1678         return buf;
1679 }
1680
1681 void mingw_open_html(const char *unixpath)
1682 {
1683         const char *htmlpath = make_backslash_path(unixpath);
1684         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1685                         const char *, const char *, const char *, INT);
1686         T ShellExecute;
1687         HMODULE shell32;
1688         int r;
1689
1690         shell32 = LoadLibrary("shell32.dll");
1691         if (!shell32)
1692                 die("cannot load shell32.dll");
1693         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1694         if (!ShellExecute)
1695                 die("cannot run browser");
1696
1697         printf("Launching default browser to display HTML ...\n");
1698         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1699         FreeLibrary(shell32);
1700         /* see the MSDN documentation referring to the result codes here */
1701         if (r <= 32) {
1702                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1703         }
1704 }
1705
1706 int link(const char *oldpath, const char *newpath)
1707 {
1708         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1709         static T create_hard_link = NULL;
1710         if (!create_hard_link) {
1711                 create_hard_link = (T) GetProcAddress(
1712                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1713                 if (!create_hard_link)
1714                         create_hard_link = (T)-1;
1715         }
1716         if (create_hard_link == (T)-1) {
1717                 errno = ENOSYS;
1718                 return -1;
1719         }
1720         if (!create_hard_link(newpath, oldpath, NULL)) {
1721                 errno = err_win_to_posix(GetLastError());
1722                 return -1;
1723         }
1724         return 0;
1725 }
1726
1727 char *getpass(const char *prompt)
1728 {
1729         struct strbuf buf = STRBUF_INIT;
1730
1731         fputs(prompt, stderr);
1732         for (;;) {
1733                 char c = _getch();
1734                 if (c == '\r' || c == '\n')
1735                         break;
1736                 strbuf_addch(&buf, c);
1737         }
1738         fputs("\n", stderr);
1739         return strbuf_detach(&buf, NULL);
1740 }
1741
1742 pid_t waitpid(pid_t pid, int *status, int options)
1743 {
1744         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1745             FALSE, pid);
1746         if (!h) {
1747                 errno = ECHILD;
1748                 return -1;
1749         }
1750
1751         if (pid > 0 && options & WNOHANG) {
1752                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1753                         CloseHandle(h);
1754                         return 0;
1755                 }
1756                 options &= ~WNOHANG;
1757         }
1758
1759         if (options == 0) {
1760                 struct pinfo_t **ppinfo;
1761                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1762                         CloseHandle(h);
1763                         return 0;
1764                 }
1765
1766                 if (status)
1767                         GetExitCodeProcess(h, (LPDWORD)status);
1768
1769                 EnterCriticalSection(&pinfo_cs);
1770
1771                 ppinfo = &pinfo;
1772                 while (*ppinfo) {
1773                         struct pinfo_t *info = *ppinfo;
1774                         if (info->pid == pid) {
1775                                 CloseHandle(info->proc);
1776                                 *ppinfo = info->next;
1777                                 free(info);
1778                                 break;
1779                         }
1780                         ppinfo = &info->next;
1781                 }
1782
1783                 LeaveCriticalSection(&pinfo_cs);
1784
1785                 CloseHandle(h);
1786                 return pid;
1787         }
1788         CloseHandle(h);
1789
1790         errno = EINVAL;
1791         return -1;
1792 }