compat/mingw.c

   1 #include "../git-compat-util.h"
   2 #include "win32.h"
   3 #include <conio.h>
   4 #include "../strbuf.h"
   5 #include "../cache.h"
   6
   7 unsigned int _CRT_fmode = _O_BINARY;
   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 int make_hidden(const char *path)
 123 {
 124         DWORD attribs = GetFileAttributes(path);
 125         if (SetFileAttributes(path, FILE_ATTRIBUTE_HIDDEN | attribs))
 126                 return 0;
 127         errno = err_win_to_posix(GetLastError());
 128         return -1;
 129 }
 130
 131 void mingw_mark_as_git_dir(const char *dir)
 132 {
 133         if (hide_dotfiles != HIDE_DOTFILES_FALSE && make_hidden(dir))
 134                 warning("Failed to make '%s' hidden", dir);
 135         git_config_set("core.hideDotFiles",
 136                 hide_dotfiles == HIDE_DOTFILES_FALSE ? "false" :
 137                 (hide_dotfiles == HIDE_DOTFILES_DOTGITONLY ?
 138                  "dotGitOnly" : "true"));
 139 }
 140
 141 #undef mkdir
 142 int mingw_mkdir(const char *path, int mode)
 143 {
 144         int ret = mkdir(path);
 145         if (!ret && hide_dotfiles == HIDE_DOTFILES_TRUE) {
 146                 /*
 147                  * In Windows a file or dir starting with a dot is not
 148                  * automatically hidden. So lets mark it as hidden when
 149                  * such a directory is created.
 150                  */
 151                 const char *start = basename((char*)path);
 152                 if (*start == '.')
 153                         return make_hidden(path);
 154         }
 155         return ret;
 156 }
 157
 158 #undef open
 159 int mingw_open (const char *filename, int oflags, ...)
 160 {
 161         va_list args;
 162         unsigned mode;
 163         int fd;
 164
 165         va_start(args, oflags);
 166         mode = va_arg(args, int);
 167         va_end(args);
 168
 169         if (!strcmp(filename, "/dev/null"))
 170                 filename = "nul";
 171
 172         fd = open(filename, oflags, mode);
 173
 174         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 175                 DWORD attrs = GetFileAttributes(filename);
 176                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 177                         errno = EISDIR;
 178         }
 179         if ((oflags & O_CREAT) && fd >= 0 &&
 180             hide_dotfiles == HIDE_DOTFILES_TRUE) {
 181                 /*
 182                  * In Windows a file or dir starting with a dot is not
 183                  * automatically hidden. So lets mark it as hidden when
 184                  * such a file is created.
 185                  */
 186                 const char *start = basename((char*)filename);
 187                 if (*start == '.' && make_hidden(filename))
 188                         warning("Could not mark '%s' as hidden.", filename);
 189         }
 190         return fd;
 191 }
 192
 193 #undef write
 194 ssize_t mingw_write(int fd, const void *buf, size_t count)
 195 {
 196         /*
 197          * While write() calls to a file on a local disk are translated
 198          * into WriteFile() calls with a maximum size of 64KB on Windows
 199          * XP and 256KB on Vista, no such cap is placed on writes to
 200          * files over the network on Windows XP.  Unfortunately, there
 201          * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 202          * bigger writes fail on Windows XP.
 203          * So we cap to a nice 31MB here to avoid write failures over
 204          * the net without changing the number of WriteFile() calls in
 205          * the local case.
 206          */
 207         return write(fd, buf, min(count, 31 * 1024 * 1024));
 208 }
 209
 210 #undef fopen
 211 FILE *mingw_fopen (const char *filename, const char *otype)
 212 {
 213         int hide = 0;
 214         FILE *file;
 215         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 216             basename((char*)filename)[0] == '.')
 217                 hide = access(filename, F_OK);
 218         if (!strcmp(filename, "/dev/null"))
 219                 filename = "nul";
 220         file = fopen(filename, otype);
 221         if (file && hide && make_hidden(filename))
 222                 warning("Could not mark '%s' as hidden.", filename);
 223         return file;
 224 }
 225
 226 #undef freopen
 227 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 228 {
 229         int hide = 0;
 230         FILE *file;
 231         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 232             basename((char*)filename)[0] == '.')
 233                 hide = access(filename, F_OK);
 234         if (filename && !strcmp(filename, "/dev/null"))
 235                 filename = "nul";
 236         file = freopen(filename, otype, stream);
 237         if (file && hide && make_hidden(filename))
 238                 warning("Could not mark '%s' as hidden.", filename);
 239         return file;
 240 }
 241
 242 /*
 243  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 244  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 245  */
 246 static inline long long filetime_to_hnsec(const FILETIME *ft)
 247 {
 248         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 249         /* Windows to Unix Epoch conversion */
 250         return winTime - 116444736000000000LL;
 251 }
 252
 253 static inline time_t filetime_to_time_t(const FILETIME *ft)
 254 {
 255         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 256 }
 257
 258 /* We keep the do_lstat code in a separate function to avoid recursion.
 259  * When a path ends with a slash, the stat will fail with ENOENT. In
 260  * this case, we strip the trailing slashes and stat again.
 261  */
 262 static int do_lstat(const char *file_name, struct stat *buf)
 263 {
 264         WIN32_FILE_ATTRIBUTE_DATA fdata;
 265
 266         if (!(errno = get_file_attr(file_name, &fdata))) {
 267                 buf->st_ino = 0;
 268                 buf->st_gid = 0;
 269                 buf->st_uid = 0;
 270                 buf->st_nlink = 1;
 271                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 272                 buf->st_size = fdata.nFileSizeLow |
 273                         (((off_t)fdata.nFileSizeHigh)<<32);
 274                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 275                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 276                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 277                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 278                 return 0;
 279         }
 280         return -1;
 281 }
 282
 283 /* We provide our own lstat/fstat functions, since the provided
 284  * lstat/fstat functions are so slow. These stat functions are
 285  * tailored for Git's usage (read: fast), and are not meant to be
 286  * complete. Note that Git stat()s are redirected to mingw_lstat()
 287  * too, since Windows doesn't really handle symlinks that well.
 288  */
 289 int mingw_lstat(const char *file_name, struct stat *buf)
 290 {
 291         int namelen;
 292         static char alt_name[PATH_MAX];
 293
 294         if (!do_lstat(file_name, buf))
 295                 return 0;
 296
 297         /* if file_name ended in a '/', Windows returned ENOENT;
 298          * try again without trailing slashes
 299          */
 300         if (errno != ENOENT)
 301                 return -1;
 302
 303         namelen = strlen(file_name);
 304         if (namelen && file_name[namelen-1] != '/')
 305                 return -1;
 306         while (namelen && file_name[namelen-1] == '/')
 307                 --namelen;
 308         if (!namelen || namelen >= PATH_MAX)
 309                 return -1;
 310
 311         memcpy(alt_name, file_name, namelen);
 312         alt_name[namelen] = 0;
 313         return do_lstat(alt_name, buf);
 314 }
 315
 316 #undef fstat
 317 int mingw_fstat(int fd, struct stat *buf)
 318 {
 319         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 320         BY_HANDLE_FILE_INFORMATION fdata;
 321
 322         if (fh == INVALID_HANDLE_VALUE) {
 323                 errno = EBADF;
 324                 return -1;
 325         }
 326         /* direct non-file handles to MS's fstat() */
 327         if (GetFileType(fh) != FILE_TYPE_DISK)
 328                 return _fstati64(fd, buf);
 329
 330         if (GetFileInformationByHandle(fh, &fdata)) {
 331                 buf->st_ino = 0;
 332                 buf->st_gid = 0;
 333                 buf->st_uid = 0;
 334                 buf->st_nlink = 1;
 335                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 336                 buf->st_size = fdata.nFileSizeLow |
 337                         (((off_t)fdata.nFileSizeHigh)<<32);
 338                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 339                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 340                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 341                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 342                 return 0;
 343         }
 344         errno = EBADF;
 345         return -1;
 346 }
 347
 348 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 349 {
 350         long long winTime = t * 10000000LL + 116444736000000000LL;
 351         ft->dwLowDateTime = winTime;
 352         ft->dwHighDateTime = winTime >> 32;
 353 }
 354
 355 int mingw_utime (const char *file_name, const struct utimbuf *times)
 356 {
 357         FILETIME mft, aft;
 358         int fh, rc;
 359
 360         /* must have write permission */
 361         DWORD attrs = GetFileAttributes(file_name);
 362         if (attrs != INVALID_FILE_ATTRIBUTES &&
 363             (attrs & FILE_ATTRIBUTE_READONLY)) {
 364                 /* ignore errors here; open() will report them */
 365                 SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 366         }
 367
 368         if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 369                 rc = -1;
 370                 goto revert_attrs;
 371         }
 372
 373         if (times) {
 374                 time_t_to_filetime(times->modtime, &mft);
 375                 time_t_to_filetime(times->actime, &aft);
 376         } else {
 377                 GetSystemTimeAsFileTime(&mft);
 378                 aft = mft;
 379         }
 380         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 381                 errno = EINVAL;
 382                 rc = -1;
 383         } else
 384                 rc = 0;
 385         close(fh);
 386
 387 revert_attrs:
 388         if (attrs != INVALID_FILE_ATTRIBUTES &&
 389             (attrs & FILE_ATTRIBUTE_READONLY)) {
 390                 /* ignore errors again */
 391                 SetFileAttributes(file_name, attrs);
 392         }
 393         return rc;
 394 }
 395
 396 unsigned int sleep (unsigned int seconds)
 397 {
 398         Sleep(seconds*1000);
 399         return 0;
 400 }
 401
 402 int mkstemp(char *template)
 403 {
 404         char *filename = mktemp(template);
 405         if (filename == NULL)
 406                 return -1;
 407         return open(filename, O_RDWR | O_CREAT, 0600);
 408 }
 409
 410 int gettimeofday(struct timeval *tv, void *tz)
 411 {
 412         FILETIME ft;
 413         long long hnsec;
 414
 415         GetSystemTimeAsFileTime(&ft);
 416         hnsec = filetime_to_hnsec(&ft);
 417         tv->tv_sec = hnsec / 10000000;
 418         tv->tv_usec = (hnsec % 10000000) / 10;
 419         return 0;
 420 }
 421
 422 int pipe(int filedes[2])
 423 {
 424         HANDLE h[2];
 425
 426         /* this creates non-inheritable handles */
 427         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 428                 errno = err_win_to_posix(GetLastError());
 429                 return -1;
 430         }
 431         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 432         if (filedes[0] < 0) {
 433                 CloseHandle(h[0]);
 434                 CloseHandle(h[1]);
 435                 return -1;
 436         }
 437         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 438         if (filedes[0] < 0) {
 439                 close(filedes[0]);
 440                 CloseHandle(h[1]);
 441                 return -1;
 442         }
 443         return 0;
 444 }
 445
 446 int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 447 {
 448         int i, pending;
 449
 450         if (timeout >= 0) {
 451                 if (nfds == 0) {
 452                         Sleep(timeout);
 453                         return 0;
 454                 }
 455                 return errno = EINVAL, error("poll timeout not supported");
 456         }
 457
 458         /* When there is only one fd to wait for, then we pretend that
 459          * input is available and let the actual wait happen when the
 460          * caller invokes read().
 461          */
 462         if (nfds == 1) {
 463                 if (!(ufds[0].events & POLLIN))
 464                         return errno = EINVAL, error("POLLIN not set");
 465                 ufds[0].revents = POLLIN;
 466                 return 0;
 467         }
 468
 469 repeat:
 470         pending = 0;
 471         for (i = 0; i < nfds; i++) {
 472                 DWORD avail = 0;
 473                 HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 474                 if (h == INVALID_HANDLE_VALUE)
 475                         return -1;      /* errno was set */
 476
 477                 if (!(ufds[i].events & POLLIN))
 478                         return errno = EINVAL, error("POLLIN not set");
 479
 480                 /* this emulation works only for pipes */
 481                 if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 482                         int err = GetLastError();
 483                         if (err == ERROR_BROKEN_PIPE) {
 484                                 ufds[i].revents = POLLHUP;
 485                                 pending++;
 486                         } else {
 487                                 errno = EINVAL;
 488                                 return error("PeekNamedPipe failed,"
 489                                         " GetLastError: %u", err);
 490                         }
 491                 } else if (avail) {
 492                         ufds[i].revents = POLLIN;
 493                         pending++;
 494                 } else
 495                         ufds[i].revents = 0;
 496         }
 497         if (!pending) {
 498                 /* The only times that we spin here is when the process
 499                  * that is connected through the pipes is waiting for
 500                  * its own input data to become available. But since
 501                  * the process (pack-objects) is itself CPU intensive,
 502                  * it will happily pick up the time slice that we are
 503                  * relinquishing here.
 504                  */
 505                 Sleep(0);
 506                 goto repeat;
 507         }
 508         return 0;
 509 }
 510
 511 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 512 {
 513         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 514         memcpy(result, gmtime(timep), sizeof(struct tm));
 515         return result;
 516 }
 517
 518 struct tm *localtime_r(const time_t *timep, struct tm *result)
 519 {
 520         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 521         memcpy(result, localtime(timep), sizeof(struct tm));
 522         return result;
 523 }
 524
 525 #undef getcwd
 526 char *mingw_getcwd(char *pointer, int len)
 527 {
 528         int i;
 529         char *ret = getcwd(pointer, len);
 530         if (!ret)
 531                 return ret;
 532         for (i = 0; pointer[i]; i++)
 533                 if (pointer[i] == '\\')
 534                         pointer[i] = '/';
 535         return ret;
 536 }
 537
 538 #undef getenv
 539 char *mingw_getenv(const char *name)
 540 {
 541         char *result = getenv(name);
 542         if (!result && !strcmp(name, "TMPDIR")) {
 543                 /* on Windows it is TMP and TEMP */
 544                 result = getenv("TMP");
 545                 if (!result)
 546                         result = getenv("TEMP");
 547         }
 548         return result;
 549 }
 550
 551 /*
 552  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 553  * (Parsing C++ Command-Line Arguments)
 554  */
 555 static const char *quote_arg(const char *arg)
 556 {
 557         /* count chars to quote */
 558         int len = 0, n = 0;
 559         int force_quotes = 0;
 560         char *q, *d;
 561         const char *p = arg;
 562         if (!*p) force_quotes = 1;
 563         while (*p) {
 564                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 565                         force_quotes = 1;
 566                 else if (*p == '"')
 567                         n++;
 568                 else if (*p == '\\') {
 569                         int count = 0;
 570                         while (*p == '\\') {
 571                                 count++;
 572                                 p++;
 573                                 len++;
 574                         }
 575                         if (*p == '"')
 576                                 n += count*2 + 1;
 577                         continue;
 578                 }
 579                 len++;
 580                 p++;
 581         }
 582         if (!force_quotes && n == 0)
 583                 return arg;
 584
 585         /* insert \ where necessary */
 586         d = q = xmalloc(len+n+3);
 587         *d++ = '"';
 588         while (*arg) {
 589                 if (*arg == '"')
 590                         *d++ = '\\';
 591                 else if (*arg == '\\') {
 592                         int count = 0;
 593                         while (*arg == '\\') {
 594                                 count++;
 595                                 *d++ = *arg++;
 596                         }
 597                         if (*arg == '"') {
 598                                 while (count-- > 0)
 599                                         *d++ = '\\';
 600                                 *d++ = '\\';
 601                         }
 602                 }
 603                 *d++ = *arg++;
 604         }
 605         *d++ = '"';
 606         *d++ = 0;
 607         return q;
 608 }
 609
 610 static const char *parse_interpreter(const char *cmd)
 611 {
 612         static char buf[100];
 613         char *p, *opt;
 614         int n, fd;
 615
 616         /* don't even try a .exe */
 617         n = strlen(cmd);
 618         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 619                 return NULL;
 620
 621         fd = open(cmd, O_RDONLY);
 622         if (fd < 0)
 623                 return NULL;
 624         n = read(fd, buf, sizeof(buf)-1);
 625         close(fd);
 626         if (n < 4)      /* at least '#!/x' and not error */
 627                 return NULL;
 628
 629         if (buf[0] != '#' || buf[1] != '!')
 630                 return NULL;
 631         buf[n] = '\0';
 632         p = buf + strcspn(buf, "\r\n");
 633         if (!*p)
 634                 return NULL;
 635
 636         *p = '\0';
 637         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 638                 return NULL;
 639         /* strip options */
 640         if ((opt = strchr(p+1, ' ')))
 641                 *opt = '\0';
 642         return p+1;
 643 }
 644
 645 /*
 646  * Splits the PATH into parts.
 647  */
 648 static char **get_path_split(void)
 649 {
 650         char *p, **path, *envpath = getenv("PATH");
 651         int i, n = 0;
 652
 653         if (!envpath || !*envpath)
 654                 return NULL;
 655
 656         envpath = xstrdup(envpath);
 657         p = envpath;
 658         while (p) {
 659                 char *dir = p;
 660                 p = strchr(p, ';');
 661                 if (p) *p++ = '\0';
 662                 if (*dir) {     /* not earlier, catches series of ; */
 663                         ++n;
 664                 }
 665         }
 666         if (!n)
 667                 return NULL;
 668
 669         path = xmalloc((n+1)*sizeof(char *));
 670         p = envpath;
 671         i = 0;
 672         do {
 673                 if (*p)
 674                         path[i++] = xstrdup(p);
 675                 p = p+strlen(p)+1;
 676         } while (i < n);
 677         path[i] = NULL;
 678
 679         free(envpath);
 680
 681         return path;
 682 }
 683
 684 static void free_path_split(char **path)
 685 {
 686         char **p = path;
 687
 688         if (!path)
 689                 return;
 690
 691         while (*p)
 692                 free(*p++);
 693         free(path);
 694 }
 695
 696 /*
 697  * exe_only means that we only want to detect .exe files, but not scripts
 698  * (which do not have an extension)
 699  */
 700 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 701 {
 702         char path[MAX_PATH];
 703         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 704
 705         if (!isexe && access(path, F_OK) == 0)
 706                 return xstrdup(path);
 707         path[strlen(path)-4] = '\0';
 708         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 709                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 710                         return xstrdup(path);
 711         return NULL;
 712 }
 713
 714 /*
 715  * Determines the absolute path of cmd using the split path in path.
 716  * If cmd contains a slash or backslash, no lookup is performed.
 717  */
 718 static char *path_lookup(const char *cmd, char **path, int exe_only)
 719 {
 720         char *prog = NULL;
 721         int len = strlen(cmd);
 722         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 723
 724         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 725                 prog = xstrdup(cmd);
 726
 727         while (!prog && *path)
 728                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 729
 730         return prog;
 731 }
 732
 733 static int env_compare(const void *a, const void *b)
 734 {
 735         char *const *ea = a;
 736         char *const *eb = b;
 737         return strcasecmp(*ea, *eb);
 738 }
 739
 740 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 741                               const char *dir,
 742                               int prepend_cmd, int fhin, int fhout, int fherr)
 743 {
 744         STARTUPINFO si;
 745         PROCESS_INFORMATION pi;
 746         struct strbuf envblk, args;
 747         unsigned flags;
 748         BOOL ret;
 749
 750         /* Determine whether or not we are associated to a console */
 751         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 752                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 753                         FILE_ATTRIBUTE_NORMAL, NULL);
 754         if (cons == INVALID_HANDLE_VALUE) {
 755                 /* There is no console associated with this process.
 756                  * Since the child is a console process, Windows
 757                  * would normally create a console window. But
 758                  * since we'll be redirecting std streams, we do
 759                  * not need the console.
 760                  * It is necessary to use DETACHED_PROCESS
 761                  * instead of CREATE_NO_WINDOW to make ssh
 762                  * recognize that it has no console.
 763                  */
 764                 flags = DETACHED_PROCESS;
 765         } else {
 766                 /* There is already a console. If we specified
 767                  * DETACHED_PROCESS here, too, Windows would
 768                  * disassociate the child from the console.
 769                  * The same is true for CREATE_NO_WINDOW.
 770                  * Go figure!
 771                  */
 772                 flags = 0;
 773                 CloseHandle(cons);
 774         }
 775         memset(&si, 0, sizeof(si));
 776         si.cb = sizeof(si);
 777         si.dwFlags = STARTF_USESTDHANDLES;
 778         si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 779         si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 780         si.hStdError = (HANDLE) _get_osfhandle(fherr);
 781
 782         /* concatenate argv, quoting args as we go */
 783         strbuf_init(&args, 0);
 784         if (prepend_cmd) {
 785                 char *quoted = (char *)quote_arg(cmd);
 786                 strbuf_addstr(&args, quoted);
 787                 if (quoted != cmd)
 788                         free(quoted);
 789         }
 790         for (; *argv; argv++) {
 791                 char *quoted = (char *)quote_arg(*argv);
 792                 if (*args.buf)
 793                         strbuf_addch(&args, ' ');
 794                 strbuf_addstr(&args, quoted);
 795                 if (quoted != *argv)
 796                         free(quoted);
 797         }
 798
 799         if (env) {
 800                 int count = 0;
 801                 char **e, **sorted_env;
 802
 803                 for (e = env; *e; e++)
 804                         count++;
 805
 806                 /* environment must be sorted */
 807                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 808                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 809                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 810
 811                 strbuf_init(&envblk, 0);
 812                 for (e = sorted_env; *e; e++) {
 813                         strbuf_addstr(&envblk, *e);
 814                         strbuf_addch(&envblk, '\0');
 815                 }
 816                 free(sorted_env);
 817         }
 818
 819         memset(&pi, 0, sizeof(pi));
 820         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 821                 env ? envblk.buf : NULL, dir, &si, &pi);
 822
 823         if (env)
 824                 strbuf_release(&envblk);
 825         strbuf_release(&args);
 826
 827         if (!ret) {
 828                 errno = ENOENT;
 829                 return -1;
 830         }
 831         CloseHandle(pi.hThread);
 832         return (pid_t)pi.hProcess;
 833 }
 834
 835 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 836                            int prepend_cmd)
 837 {
 838         return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 839 }
 840
 841 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 842                      const char *dir,
 843                      int fhin, int fhout, int fherr)
 844 {
 845         pid_t pid;
 846         char **path = get_path_split();
 847         char *prog = path_lookup(cmd, path, 0);
 848
 849         if (!prog) {
 850                 errno = ENOENT;
 851                 pid = -1;
 852         }
 853         else {
 854                 const char *interpr = parse_interpreter(prog);
 855
 856                 if (interpr) {
 857                         const char *argv0 = argv[0];
 858                         char *iprog = path_lookup(interpr, path, 1);
 859                         argv[0] = prog;
 860                         if (!iprog) {
 861                                 errno = ENOENT;
 862                                 pid = -1;
 863                         }
 864                         else {
 865                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 866                                                        fhin, fhout, fherr);
 867                                 free(iprog);
 868                         }
 869                         argv[0] = argv0;
 870                 }
 871                 else
 872                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
 873                                                fhin, fhout, fherr);
 874                 free(prog);
 875         }
 876         free_path_split(path);
 877         return pid;
 878 }
 879
 880 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 881 {
 882         const char *interpr = parse_interpreter(cmd);
 883         char **path;
 884         char *prog;
 885         int pid = 0;
 886
 887         if (!interpr)
 888                 return 0;
 889         path = get_path_split();
 890         prog = path_lookup(interpr, path, 1);
 891         if (prog) {
 892                 int argc = 0;
 893                 const char **argv2;
 894                 while (argv[argc]) argc++;
 895                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
 896                 argv2[0] = (char *)cmd; /* full path to the script file */
 897                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 898                 pid = mingw_spawnve(prog, argv2, env, 1);
 899                 if (pid >= 0) {
 900                         int status;
 901                         if (waitpid(pid, &status, 0) < 0)
 902                                 status = 255;
 903                         exit(status);
 904                 }
 905                 pid = 1;        /* indicate that we tried but failed */
 906                 free(prog);
 907                 free(argv2);
 908         }
 909         free_path_split(path);
 910         return pid;
 911 }
 912
 913 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 914 {
 915         /* check if git_command is a shell script */
 916         if (!try_shell_exec(cmd, argv, (char **)env)) {
 917                 int pid, status;
 918
 919                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 920                 if (pid < 0)
 921                         return;
 922                 if (waitpid(pid, &status, 0) < 0)
 923                         status = 255;
 924                 exit(status);
 925         }
 926 }
 927
 928 void mingw_execvp(const char *cmd, char *const *argv)
 929 {
 930         char **path = get_path_split();
 931         char *prog = path_lookup(cmd, path, 0);
 932
 933         if (prog) {
 934                 mingw_execve(prog, argv, environ);
 935                 free(prog);
 936         } else
 937                 errno = ENOENT;
 938
 939         free_path_split(path);
 940 }
 941
 942 static char **copy_environ(void)
 943 {
 944         char **env;
 945         int i = 0;
 946         while (environ[i])
 947                 i++;
 948         env = xmalloc((i+1)*sizeof(*env));
 949         for (i = 0; environ[i]; i++)
 950                 env[i] = xstrdup(environ[i]);
 951         env[i] = NULL;
 952         return env;
 953 }
 954
 955 void free_environ(char **env)
 956 {
 957         int i;
 958         for (i = 0; env[i]; i++)
 959                 free(env[i]);
 960         free(env);
 961 }
 962
 963 static int lookup_env(char **env, const char *name, size_t nmln)
 964 {
 965         int i;
 966
 967         for (i = 0; env[i]; i++) {
 968                 if (0 == strncmp(env[i], name, nmln)
 969                     && '=' == env[i][nmln])
 970                         /* matches */
 971                         return i;
 972         }
 973         return -1;
 974 }
 975
 976 /*
 977  * If name contains '=', then sets the variable, otherwise it unsets it
 978  */
 979 static char **env_setenv(char **env, const char *name)
 980 {
 981         char *eq = strchrnul(name, '=');
 982         int i = lookup_env(env, name, eq-name);
 983
 984         if (i < 0) {
 985                 if (*eq) {
 986                         for (i = 0; env[i]; i++)
 987                                 ;
 988                         env = xrealloc(env, (i+2)*sizeof(*env));
 989                         env[i] = xstrdup(name);
 990                         env[i+1] = NULL;
 991                 }
 992         }
 993         else {
 994                 free(env[i]);
 995                 if (*eq)
 996                         env[i] = xstrdup(name);
 997                 else
 998                         for (; env[i]; i++)
 999                                 env[i] = env[i+1];
1000         }
1001         return env;
1002 }
1003
1004 /*
1005  * Copies global environ and adjusts variables as specified by vars.
1006  */
1007 char **make_augmented_environ(const char *const *vars)
1008 {
1009         char **env = copy_environ();
1010
1011         while (*vars)
1012                 env = env_setenv(env, *vars++);
1013         return env;
1014 }
1015
1016 /*
1017  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1018  * that service contains a numerical port, or that it it is null. It
1019  * does a simple search using gethostbyname, and returns one IPv4 host
1020  * if one was found.
1021  */
1022 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1023                                    const struct addrinfo *hints,
1024                                    struct addrinfo **res)
1025 {
1026         struct hostent *h = gethostbyname(node);
1027         struct addrinfo *ai;
1028         struct sockaddr_in *sin;
1029
1030         if (!h)
1031                 return WSAGetLastError();
1032
1033         ai = xmalloc(sizeof(struct addrinfo));
1034         *res = ai;
1035         ai->ai_flags = 0;
1036         ai->ai_family = AF_INET;
1037         ai->ai_socktype = hints->ai_socktype;
1038         switch (hints->ai_socktype) {
1039         case SOCK_STREAM:
1040                 ai->ai_protocol = IPPROTO_TCP;
1041                 break;
1042         case SOCK_DGRAM:
1043                 ai->ai_protocol = IPPROTO_UDP;
1044                 break;
1045         default:
1046                 ai->ai_protocol = 0;
1047                 break;
1048         }
1049         ai->ai_addrlen = sizeof(struct sockaddr_in);
1050         ai->ai_canonname = strdup(h->h_name);
1051
1052         sin = xmalloc(ai->ai_addrlen);
1053         memset(sin, 0, ai->ai_addrlen);
1054         sin->sin_family = AF_INET;
1055         if (service)
1056                 sin->sin_port = htons(atoi(service));
1057         sin->sin_addr = *(struct in_addr *)h->h_addr;
1058         ai->ai_addr = (struct sockaddr *)sin;
1059         ai->ai_next = 0;
1060         return 0;
1061 }
1062
1063 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1064 {
1065         free(res->ai_canonname);
1066         free(res->ai_addr);
1067         free(res);
1068 }
1069
1070 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1071                                    char *host, DWORD hostlen,
1072                                    char *serv, DWORD servlen, int flags)
1073 {
1074         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1075         if (sa->sa_family != AF_INET)
1076                 return EAI_FAMILY;
1077         if (!host && !serv)
1078                 return EAI_NONAME;
1079
1080         if (host && hostlen > 0) {
1081                 struct hostent *ent = NULL;
1082                 if (!(flags & NI_NUMERICHOST))
1083                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1084                                             sizeof(sin->sin_addr), AF_INET);
1085
1086                 if (ent)
1087                         snprintf(host, hostlen, "%s", ent->h_name);
1088                 else if (flags & NI_NAMEREQD)
1089                         return EAI_NONAME;
1090                 else
1091                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1092         }
1093
1094         if (serv && servlen > 0) {
1095                 struct servent *ent = NULL;
1096                 if (!(flags & NI_NUMERICSERV))
1097                         ent = getservbyport(sin->sin_port,
1098                                             flags & NI_DGRAM ? "udp" : "tcp");
1099
1100                 if (ent)
1101                         snprintf(serv, servlen, "%s", ent->s_name);
1102                 else
1103                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1104         }
1105
1106         return 0;
1107 }
1108
1109 static HMODULE ipv6_dll = NULL;
1110 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1111 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1112                                       const struct addrinfo *hints,
1113                                       struct addrinfo **res);
1114 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1115                                       char *host, DWORD hostlen,
1116                                       char *serv, DWORD servlen, int flags);
1117 /*
1118  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1119  * don't need to try to load that one dynamically.
1120  */
1121
1122 static void socket_cleanup(void)
1123 {
1124         WSACleanup();
1125         if (ipv6_dll)
1126                 FreeLibrary(ipv6_dll);
1127         ipv6_dll = NULL;
1128         ipv6_freeaddrinfo = freeaddrinfo_stub;
1129         ipv6_getaddrinfo = getaddrinfo_stub;
1130         ipv6_getnameinfo = getnameinfo_stub;
1131 }
1132
1133 static void ensure_socket_initialization(void)
1134 {
1135         WSADATA wsa;
1136         static int initialized = 0;
1137         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1138         const char **name;
1139
1140         if (initialized)
1141                 return;
1142
1143         if (WSAStartup(MAKEWORD(2,2), &wsa))
1144                 die("unable to initialize winsock subsystem, error %d",
1145                         WSAGetLastError());
1146
1147         for (name = libraries; *name; name++) {
1148                 ipv6_dll = LoadLibrary(*name);
1149                 if (!ipv6_dll)
1150                         continue;
1151
1152                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1153                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1154                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1155                                                    const struct addrinfo *,
1156                                                    struct addrinfo **))
1157                         GetProcAddress(ipv6_dll, "getaddrinfo");
1158                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1159                                                    socklen_t, char *, DWORD,
1160                                                    char *, DWORD, int))
1161                         GetProcAddress(ipv6_dll, "getnameinfo");
1162                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1163                         FreeLibrary(ipv6_dll);
1164                         ipv6_dll = NULL;
1165                 } else
1166                         break;
1167         }
1168         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1169                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1170                 ipv6_getaddrinfo = getaddrinfo_stub;
1171                 ipv6_getnameinfo = getnameinfo_stub;
1172         }
1173
1174         atexit(socket_cleanup);
1175         initialized = 1;
1176 }
1177
1178 #undef gethostbyname
1179 struct hostent *mingw_gethostbyname(const char *host)
1180 {
1181         ensure_socket_initialization();
1182         return gethostbyname(host);
1183 }
1184
1185 void mingw_freeaddrinfo(struct addrinfo *res)
1186 {
1187         ipv6_freeaddrinfo(res);
1188 }
1189
1190 int mingw_getaddrinfo(const char *node, const char *service,
1191                       const struct addrinfo *hints, struct addrinfo **res)
1192 {
1193         ensure_socket_initialization();
1194         return ipv6_getaddrinfo(node, service, hints, res);
1195 }
1196
1197 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1198                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1199                       int flags)
1200 {
1201         ensure_socket_initialization();
1202         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1203 }
1204
1205 int mingw_socket(int domain, int type, int protocol)
1206 {
1207         int sockfd;
1208         SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
1209         if (s == INVALID_SOCKET) {
1210                 /*
1211                  * WSAGetLastError() values are regular BSD error codes
1212                  * biased by WSABASEERR.
1213                  * However, strerror() does not know about networking
1214                  * specific errors, which are values beginning at 38 or so.
1215                  * Therefore, we choose to leave the biased error code
1216                  * in errno so that _if_ someone looks up the code somewhere,
1217                  * then it is at least the number that are usually listed.
1218                  */
1219                 errno = WSAGetLastError();
1220                 return -1;
1221         }
1222         /* convert into a file descriptor */
1223         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1224                 closesocket(s);
1225                 return error("unable to make a socket file descriptor: %s",
1226                         strerror(errno));
1227         }
1228         return sockfd;
1229 }
1230
1231 #undef connect
1232 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1233 {
1234         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1235         return connect(s, sa, sz);
1236 }
1237
1238 #undef rename
1239 int mingw_rename(const char *pold, const char *pnew)
1240 {
1241         DWORD attrs, gle;
1242         int tries = 0;
1243         static const int delay[] = { 0, 1, 10, 20, 40 };
1244
1245         /*
1246          * Try native rename() first to get errno right.
1247          * It is based on MoveFile(), which cannot overwrite existing files.
1248          */
1249         if (!rename(pold, pnew))
1250                 return 0;
1251         if (errno != EEXIST)
1252                 return -1;
1253 repeat:
1254         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1255                 return 0;
1256         /* TODO: translate more errors */
1257         gle = GetLastError();
1258         if (gle == ERROR_ACCESS_DENIED &&
1259             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1260                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1261                         errno = EISDIR;
1262                         return -1;
1263                 }
1264                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1265                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1266                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1267                                 return 0;
1268                         gle = GetLastError();
1269                         /* revert file attributes on failure */
1270                         SetFileAttributes(pnew, attrs);
1271                 }
1272         }
1273         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1274                 /*
1275                  * We assume that some other process had the source or
1276                  * destination file open at the wrong moment and retry.
1277                  * In order to give the other process a higher chance to
1278                  * complete its operation, we give up our time slice now.
1279                  * If we have to retry again, we do sleep a bit.
1280                  */
1281                 Sleep(delay[tries]);
1282                 tries++;
1283                 goto repeat;
1284         }
1285         errno = EACCES;
1286         return -1;
1287 }
1288
1289 /*
1290  * Note that this doesn't return the actual pagesize, but
1291  * the allocation granularity. If future Windows specific git code
1292  * needs the real getpagesize function, we need to find another solution.
1293  */
1294 int mingw_getpagesize(void)
1295 {
1296         SYSTEM_INFO si;
1297         GetSystemInfo(&si);
1298         return si.dwAllocationGranularity;
1299 }
1300
1301 struct passwd *getpwuid(int uid)
1302 {
1303         static char user_name[100];
1304         static struct passwd p;
1305
1306         DWORD len = sizeof(user_name);
1307         if (!GetUserName(user_name, &len))
1308                 return NULL;
1309         p.pw_name = user_name;
1310         p.pw_gecos = "unknown";
1311         p.pw_dir = NULL;
1312         return &p;
1313 }
1314
1315 static HANDLE timer_event;
1316 static HANDLE timer_thread;
1317 static int timer_interval;
1318 static int one_shot;
1319 static sig_handler_t timer_fn = SIG_DFL;
1320
1321 /* The timer works like this:
1322  * The thread, ticktack(), is a trivial routine that most of the time
1323  * only waits to receive the signal to terminate. The main thread tells
1324  * the thread to terminate by setting the timer_event to the signalled
1325  * state.
1326  * But ticktack() interrupts the wait state after the timer's interval
1327  * length to call the signal handler.
1328  */
1329
1330 static unsigned __stdcall ticktack(void *dummy)
1331 {
1332         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1333                 if (timer_fn == SIG_DFL)
1334                         die("Alarm");
1335                 if (timer_fn != SIG_IGN)
1336                         timer_fn(SIGALRM);
1337                 if (one_shot)
1338                         break;
1339         }
1340         return 0;
1341 }
1342
1343 static int start_timer_thread(void)
1344 {
1345         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1346         if (timer_event) {
1347                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1348                 if (!timer_thread )
1349                         return errno = ENOMEM,
1350                                 error("cannot start timer thread");
1351         } else
1352                 return errno = ENOMEM,
1353                         error("cannot allocate resources for timer");
1354         return 0;
1355 }
1356
1357 static void stop_timer_thread(void)
1358 {
1359         if (timer_event)
1360                 SetEvent(timer_event);  /* tell thread to terminate */
1361         if (timer_thread) {
1362                 int rc = WaitForSingleObject(timer_thread, 1000);
1363                 if (rc == WAIT_TIMEOUT)
1364                         error("timer thread did not terminate timely");
1365                 else if (rc != WAIT_OBJECT_0)
1366                         error("waiting for timer thread failed: %lu",
1367                               GetLastError());
1368                 CloseHandle(timer_thread);
1369         }
1370         if (timer_event)
1371                 CloseHandle(timer_event);
1372         timer_event = NULL;
1373         timer_thread = NULL;
1374 }
1375
1376 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1377 {
1378         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1379 }
1380
1381 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1382 {
1383         static const struct timeval zero;
1384         static int atexit_done;
1385
1386         if (out != NULL)
1387                 return errno = EINVAL,
1388                         error("setitimer param 3 != NULL not implemented");
1389         if (!is_timeval_eq(&in->it_interval, &zero) &&
1390             !is_timeval_eq(&in->it_interval, &in->it_value))
1391                 return errno = EINVAL,
1392                         error("setitimer: it_interval must be zero or eq it_value");
1393
1394         if (timer_thread)
1395                 stop_timer_thread();
1396
1397         if (is_timeval_eq(&in->it_value, &zero) &&
1398             is_timeval_eq(&in->it_interval, &zero))
1399                 return 0;
1400
1401         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1402         one_shot = is_timeval_eq(&in->it_interval, &zero);
1403         if (!atexit_done) {
1404                 atexit(stop_timer_thread);
1405                 atexit_done = 1;
1406         }
1407         return start_timer_thread();
1408 }
1409
1410 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1411 {
1412         if (sig != SIGALRM)
1413                 return errno = EINVAL,
1414                         error("sigaction only implemented for SIGALRM");
1415         if (out != NULL)
1416                 return errno = EINVAL,
1417                         error("sigaction: param 3 != NULL not implemented");
1418
1419         timer_fn = in->sa_handler;
1420         return 0;
1421 }
1422
1423 #undef signal
1424 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1425 {
1426         sig_handler_t old = timer_fn;
1427         if (sig != SIGALRM)
1428                 return signal(sig, handler);
1429         timer_fn = handler;
1430         return old;
1431 }
1432
1433 static const char *make_backslash_path(const char *path)
1434 {
1435         static char buf[PATH_MAX + 1];
1436         char *c;
1437
1438         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1439                 die("Too long path: %.*s", 60, path);
1440
1441         for (c = buf; *c; c++) {
1442                 if (*c == '/')
1443                         *c = '\\';
1444         }
1445         return buf;
1446 }
1447
1448 void mingw_open_html(const char *unixpath)
1449 {
1450         const char *htmlpath = make_backslash_path(unixpath);
1451         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1452                         const char *, const char *, const char *, INT);
1453         T ShellExecute;
1454         HMODULE shell32;
1455
1456         shell32 = LoadLibrary("shell32.dll");
1457         if (!shell32)
1458                 die("cannot load shell32.dll");
1459         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1460         if (!ShellExecute)
1461                 die("cannot run browser");
1462
1463         printf("Launching default browser to display HTML ...\n");
1464         ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1465
1466         FreeLibrary(shell32);
1467 }
1468
1469 int link(const char *oldpath, const char *newpath)
1470 {
1471         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1472         static T create_hard_link = NULL;
1473         if (!create_hard_link) {
1474                 create_hard_link = (T) GetProcAddress(
1475                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1476                 if (!create_hard_link)
1477                         create_hard_link = (T)-1;
1478         }
1479         if (create_hard_link == (T)-1) {
1480                 errno = ENOSYS;
1481                 return -1;
1482         }
1483         if (!create_hard_link(newpath, oldpath, NULL)) {
1484                 errno = err_win_to_posix(GetLastError());
1485                 return -1;
1486         }
1487         return 0;
1488 }
1489
1490 char *getpass(const char *prompt)
1491 {
1492         struct strbuf buf = STRBUF_INIT;
1493
1494         fputs(prompt, stderr);
1495         for (;;) {
1496                 char c = _getch();
1497                 if (c == '\r' || c == '\n')
1498                         break;
1499                 strbuf_addch(&buf, c);
1500         }
1501         fputs("\n", stderr);
1502         return strbuf_detach(&buf, NULL);
1503 }
1504
1505 #ifndef NO_MINGW_REPLACE_READDIR
1506 /* MinGW readdir implementation to avoid extra lstats for Git */
1507 struct mingw_DIR
1508 {
1509         struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1510         struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1511         long                    dd_handle;      /* _findnext handle */
1512         int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1513         char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1514 };
1515
1516 struct dirent *mingw_readdir(DIR *dir)
1517 {
1518         WIN32_FIND_DATAA buf;
1519         HANDLE handle;
1520         struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1521
1522         if (!dir->dd_handle) {
1523                 errno = EBADF; /* No set_errno for mingw */
1524                 return NULL;
1525         }
1526
1527         if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1528         {
1529                 DWORD lasterr;
1530                 handle = FindFirstFileA(dir->dd_name, &buf);
1531                 lasterr = GetLastError();
1532                 dir->dd_handle = (long)handle;
1533                 if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1534                         errno = err_win_to_posix(lasterr);
1535                         return NULL;
1536                 }
1537         } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1538                 return NULL;
1539         } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1540                 DWORD lasterr = GetLastError();
1541                 FindClose((HANDLE)dir->dd_handle);
1542                 dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1543                 /* POSIX says you shouldn't set errno when readdir can't
1544                    find any more files; so, if another error we leave it set. */
1545                 if (lasterr != ERROR_NO_MORE_FILES)
1546                         errno = err_win_to_posix(lasterr);
1547                 return NULL;
1548         }
1549
1550         /* We get here if `buf' contains valid data.  */
1551         strcpy(dir->dd_dir.d_name, buf.cFileName);
1552         ++dir->dd_stat;
1553
1554         /* Set file type, based on WIN32_FIND_DATA */
1555         mdir->dd_dir.d_type = 0;
1556         if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1557                 mdir->dd_dir.d_type |= DT_DIR;
1558         else
1559                 mdir->dd_dir.d_type |= DT_REG;
1560
1561         return (struct dirent*)&dir->dd_dir;
1562 }
1563 #endif // !NO_MINGW_REPLACE_READDIR