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