compat/mingw.c

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