compat/mingw.c

   1 #include "../git-compat-util.h"
   2 #include "win32.h"
   3 #include <conio.h>
   4 #include <winioctl.h>
   5 #include <shellapi.h>
   6 #include "../strbuf.h"
   7 #include "../cache.h"
   8 #include "../run-command.h"
   9
  10 unsigned int _CRT_fmode = _O_BINARY;
  11 static const int delay[] = { 0, 1, 10, 20, 40 };
  12
  13 int err_win_to_posix(DWORD winerr)
  14 {
  15         int error = ENOSYS;
  16         switch(winerr) {
  17         case ERROR_ACCESS_DENIED: error = EACCES; break;
  18         case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  19         case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  20         case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  21         case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  22         case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  23         case ERROR_BAD_COMMAND: error = EIO; break;
  24         case ERROR_BAD_DEVICE: error = ENODEV; break;
  25         case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  26         case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  27         case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  28         case ERROR_BAD_LENGTH: error = EINVAL; break;
  29         case ERROR_BAD_PATHNAME: error = ENOENT; break;
  30         case ERROR_BAD_PIPE: error = EPIPE; break;
  31         case ERROR_BAD_UNIT: error = ENODEV; break;
  32         case ERROR_BAD_USERNAME: error = EINVAL; break;
  33         case ERROR_BROKEN_PIPE: error = EPIPE; break;
  34         case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  35         case ERROR_BUSY: error = EBUSY; break;
  36         case ERROR_BUSY_DRIVE: error = EBUSY; break;
  37         case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  38         case ERROR_CANNOT_MAKE: error = EACCES; break;
  39         case ERROR_CANTOPEN: error = EIO; break;
  40         case ERROR_CANTREAD: error = EIO; break;
  41         case ERROR_CANTWRITE: error = EIO; break;
  42         case ERROR_CRC: error = EIO; break;
  43         case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  44         case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  45         case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  46         case ERROR_DIRECTORY: error = EINVAL; break;
  47         case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  48         case ERROR_DISK_CHANGE: error = EIO; break;
  49         case ERROR_DISK_FULL: error = ENOSPC; break;
  50         case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  51         case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  52         case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  53         case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  54         case ERROR_FILE_EXISTS: error = EEXIST; break;
  55         case ERROR_FILE_INVALID: error = ENODEV; break;
  56         case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  57         case ERROR_GEN_FAILURE: error = EIO; break;
  58         case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  59         case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  60         case ERROR_INVALID_ACCESS: error = EACCES; break;
  61         case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  62         case ERROR_INVALID_BLOCK: error = EFAULT; break;
  63         case ERROR_INVALID_DATA: error = EINVAL; break;
  64         case ERROR_INVALID_DRIVE: error = ENODEV; break;
  65         case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  66         case ERROR_INVALID_FLAGS: error = EINVAL; break;
  67         case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  68         case ERROR_INVALID_HANDLE: error = EBADF; break;
  69         case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  70         case ERROR_INVALID_NAME: error = EINVAL; break;
  71         case ERROR_INVALID_OWNER: error = EINVAL; break;
  72         case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  73         case ERROR_INVALID_PASSWORD: error = EPERM; break;
  74         case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  75         case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  76         case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  77         case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  78         case ERROR_IO_DEVICE: error = EIO; break;
  79         case ERROR_IO_INCOMPLETE: error = EINTR; break;
  80         case ERROR_LOCKED: error = EBUSY; break;
  81         case ERROR_LOCK_VIOLATION: error = EACCES; break;
  82         case ERROR_LOGON_FAILURE: error = EACCES; break;
  83         case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  84         case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  85         case ERROR_MORE_DATA: error = EPIPE; break;
  86         case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  87         case ERROR_NOACCESS: error = EFAULT; break;
  88         case ERROR_NONE_MAPPED: error = EINVAL; break;
  89         case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  90         case ERROR_NOT_READY: error = EAGAIN; break;
  91         case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  92         case ERROR_NO_DATA: error = EPIPE; break;
  93         case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  94         case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  95         case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  96         case ERROR_OPEN_FAILED: error = EIO; break;
  97         case ERROR_OPEN_FILES: error = EBUSY; break;
  98         case ERROR_OPERATION_ABORTED: error = EINTR; break;
  99         case ERROR_OUTOFMEMORY: error = ENOMEM; break;
 100         case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
 101         case ERROR_PATH_BUSY: error = EBUSY; break;
 102         case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
 103         case ERROR_PIPE_BUSY: error = EBUSY; break;
 104         case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 105         case ERROR_PIPE_LISTENING: error = EPIPE; break;
 106         case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 107         case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 108         case ERROR_READ_FAULT: error = EIO; break;
 109         case ERROR_SEEK: error = EIO; break;
 110         case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 111         case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 112         case ERROR_SHARING_VIOLATION: error = EACCES; break;
 113         case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 114         case ERROR_SWAPERROR: error = ENOENT; break;
 115         case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 116         case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 117         case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 118         case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 119         case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 120         case ERROR_WRITE_FAULT: error = EIO; break;
 121         case ERROR_WRITE_PROTECT: error = EROFS; break;
 122         }
 123         return error;
 124 }
 125
 126 static int make_hidden(const char *path)
 127 {
 128         DWORD attribs = GetFileAttributes(path);
 129         if (SetFileAttributes(path, FILE_ATTRIBUTE_HIDDEN | attribs))
 130                 return 0;
 131         errno = err_win_to_posix(GetLastError());
 132         return -1;
 133 }
 134
 135 void mingw_mark_as_git_dir(const char *dir)
 136 {
 137         if (hide_dotfiles != HIDE_DOTFILES_FALSE && make_hidden(dir))
 138                 warning("Failed to make '%s' hidden", dir);
 139         git_config_set("core.hideDotFiles",
 140                 hide_dotfiles == HIDE_DOTFILES_FALSE ? "false" :
 141                 (hide_dotfiles == HIDE_DOTFILES_DOTGITONLY ?
 142                  "dotGitOnly" : "true"));
 143 }
 144
 145 #undef mkdir
 146 int mingw_mkdir(const char *path, int mode)
 147 {
 148         int ret = mkdir(path);
 149         if (!ret && hide_dotfiles == HIDE_DOTFILES_TRUE) {
 150                 /*
 151                  * In Windows a file or dir starting with a dot is not
 152                  * automatically hidden. So lets mark it as hidden when
 153                  * such a directory is created.
 154                  */
 155                 const char *start = basename((char*)path);
 156                 if (*start == '.')
 157                         return make_hidden(path);
 158         }
 159         return ret;
 160 }
 161
 162 static int ask_user_yes_no(const char *format, ...)
 163 {
 164         char answer[5];
 165         char question[4096];
 166         const char *retry_hook[] = { NULL, NULL, NULL };
 167         va_list args;
 168
 169         if ((retry_hook[0] = getenv("GIT_ASK_YESNO"))) {
 170
 171                 va_start(args, format);
 172                 vsnprintf(question, sizeof(question), format, args);
 173                 va_end(args);
 174
 175                 retry_hook[1] = question;
 176                 return !run_command_v_opt(retry_hook, 0);
 177         }
 178
 179         if (!isatty(_fileno(stdin)))
 180                 return 0;
 181
 182         while (1) {
 183                 va_start(args, format);
 184                 vfprintf(stderr, format, args);
 185                 va_end(args);
 186                 fprintf(stderr, " (y/n)? ");
 187
 188                 if (fgets(answer, sizeof(answer), stdin)) {
 189                         /* remove the newline */
 190                         if (answer[strlen(answer)-2] == '\r')
 191                                 answer[strlen(answer)-2] = '\0';
 192                         if (answer[strlen(answer)-1] == '\n')
 193                                 answer[strlen(answer)-1] = '\0';
 194                 } else
 195                         return 0;
 196
 197                 if (answer[0] == 'y' && strlen(answer) == 1)
 198                         return 1;
 199                 if (!strncasecmp(answer, "yes", sizeof(answer)))
 200                         return 1;
 201                 if (answer[0] == 'n' && strlen(answer) == 1)
 202                         return 0;
 203                 if (!strncasecmp(answer, "no", sizeof(answer)))
 204                         return 0;
 205                 fprintf(stderr, "I did not understand your answer: '%s'\n",
 206                                 answer);
 207         }
 208 }
 209
 210 #undef unlink
 211 int mingw_unlink(const char *pathname)
 212 {
 213         int ret, tries = 0;
 214
 215         /* read-only files cannot be removed */
 216         chmod(pathname, 0666);
 217         while ((ret = unlink(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 218                 if (errno != EACCES)
 219                         break;
 220                 /*
 221                  * We assume that some other process had the source or
 222                  * destination file open at the wrong moment and retry.
 223                  * In order to give the other process a higher chance to
 224                  * complete its operation, we give up our time slice now.
 225                  * If we have to retry again, we do sleep a bit.
 226                  */
 227                 Sleep(delay[tries]);
 228                 tries++;
 229         }
 230         while (ret == -1 && errno == EACCES &&
 231                ask_user_yes_no("Unlink of file '%s' failed. "
 232                         "Should I try again?", pathname))
 233                ret = unlink(pathname);
 234         return ret;
 235 }
 236
 237 #undef rmdir
 238 int mingw_rmdir(const char *pathname)
 239 {
 240     int ret, tries = 0;
 241
 242         while ((ret = rmdir(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 243                 if (errno != EACCES)
 244                         break;
 245                 /*
 246                  * We assume that some other process had the source or
 247                  * destination file open at the wrong moment and retry.
 248                  * In order to give the other process a higher chance to
 249                  * complete its operation, we give up our time slice now.
 250                  * If we have to retry again, we do sleep a bit.
 251                  */
 252                 Sleep(delay[tries]);
 253                 tries++;
 254         }
 255         while (ret == -1 && errno == EACCES &&
 256                ask_user_yes_no("Deletion of directory '%s' failed. "
 257                         "Should I try again?", pathname))
 258                ret = rmdir(pathname);
 259         return ret;
 260 }
 261
 262 #undef open
 263 int mingw_open (const char *filename, int oflags, ...)
 264 {
 265         va_list args;
 266         unsigned mode;
 267         int fd;
 268
 269         va_start(args, oflags);
 270         mode = va_arg(args, int);
 271         va_end(args);
 272
 273         if (!strcmp(filename, "/dev/null"))
 274                 filename = "nul";
 275
 276         fd = open(filename, oflags | O_BINARY, mode);
 277
 278         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 279                 DWORD attrs = GetFileAttributes(filename);
 280                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 281                         errno = EISDIR;
 282         }
 283         if ((oflags & O_CREAT) && fd >= 0 &&
 284             hide_dotfiles == HIDE_DOTFILES_TRUE) {
 285                 /*
 286                  * In Windows a file or dir starting with a dot is not
 287                  * automatically hidden. So lets mark it as hidden when
 288                  * such a file is created.
 289                  */
 290                 const char *start = basename((char*)filename);
 291                 if (*start == '.' && make_hidden(filename))
 292                         warning("Could not mark '%s' as hidden.", filename);
 293         }
 294         return fd;
 295 }
 296
 297 #undef fopen
 298 FILE *mingw_fopen (const char *filename, const char *mode)
 299 {
 300         int hide = 0;
 301         FILE *file;
 302         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 303             basename((char*)filename)[0] == '.')
 304                 hide = access(filename, F_OK);
 305
 306         file = fopen(strcmp(filename, "/dev/null") ? filename : "NUL", mode);
 307         /*
 308          * In Windows a file or dir starting with a dot is not
 309          * automatically hidden. So lets mark it as hidden when
 310          * such a file is created.
 311          */
 312         if (file && hide && make_hidden(filename))
 313                 warning("Could not mark '%s' as hidden.", filename);
 314         return file;
 315 }
 316
 317 /*
 318  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 319  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 320  */
 321 static inline long long filetime_to_hnsec(const FILETIME *ft)
 322 {
 323         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 324         /* Windows to Unix Epoch conversion */
 325         return winTime - 116444736000000000LL;
 326 }
 327
 328 static inline time_t filetime_to_time_t(const FILETIME *ft)
 329 {
 330         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 331 }
 332
 333 /*
 334  * We keep the do_lstat code in a separate function to avoid recursion.
 335  * When a path ends with a slash, the stat will fail with ENOENT. In
 336  * this case, we strip the trailing slashes and stat again.
 337  */
 338 static int do_lstat(const char *file_name, struct stat *buf)
 339 {
 340         WIN32_FILE_ATTRIBUTE_DATA fdata;
 341
 342         if (!(errno = get_file_attr(file_name, &fdata))) {
 343                 buf->st_ino = 0;
 344                 buf->st_gid = 0;
 345                 buf->st_uid = 0;
 346                 buf->st_nlink = 1;
 347                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 348                 buf->st_size = fdata.nFileSizeLow |
 349                         (((off_t)fdata.nFileSizeHigh)<<32);
 350                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 351                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 352                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 353                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 354                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 355                         WIN32_FIND_DATAA findbuf;
 356                         HANDLE handle = FindFirstFileA(file_name, &findbuf);
 357                         if (handle != INVALID_HANDLE_VALUE) {
 358                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 359                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 360                                         char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 361                                         buf->st_mode = S_IREAD | S_IFLNK;
 362                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 363                                                 buf->st_mode |= S_IWRITE;
 364                                         buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 365                                 }
 366                                 FindClose(handle);
 367                         }
 368                 }
 369                 return 0;
 370         }
 371         return -1;
 372 }
 373
 374 /*
 375  * We provide our own lstat/fstat functions, since the provided
 376  * lstat/fstat functions are so slow. These stat functions are
 377  * tailored for Git's usage (read: fast), and are not meant to be
 378  * complete. Note that Git stat()s are redirected to mingw_lstat()
 379  * too, since Windows doesn't really handle symlinks that well.
 380  */
 381 int mingw_lstat(const char *file_name, struct stat *buf)
 382 {
 383         int namelen;
 384         static char alt_name[PATH_MAX];
 385
 386         if (!do_lstat(file_name, buf))
 387                 return 0;
 388
 389         /*
 390          * if file_name ended in a '/', Windows returned ENOENT;
 391          * try again without trailing slashes
 392          */
 393         if (errno != ENOENT)
 394                 return -1;
 395
 396         namelen = strlen(file_name);
 397         if (namelen && file_name[namelen-1] != '/')
 398                 return -1;
 399         while (namelen && file_name[namelen-1] == '/')
 400                 --namelen;
 401         if (!namelen || namelen >= PATH_MAX)
 402                 return -1;
 403
 404         memcpy(alt_name, file_name, namelen);
 405         alt_name[namelen] = 0;
 406         return do_lstat(alt_name, buf);
 407 }
 408
 409 #undef fstat
 410 int mingw_fstat(int fd, struct stat *buf)
 411 {
 412         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 413         BY_HANDLE_FILE_INFORMATION fdata;
 414
 415         if (fh == INVALID_HANDLE_VALUE) {
 416                 errno = EBADF;
 417                 return -1;
 418         }
 419         /* direct non-file handles to MS's fstat() */
 420         if (GetFileType(fh) != FILE_TYPE_DISK)
 421                 return _fstati64(fd, buf);
 422
 423         if (GetFileInformationByHandle(fh, &fdata)) {
 424                 buf->st_ino = 0;
 425                 buf->st_gid = 0;
 426                 buf->st_uid = 0;
 427                 buf->st_nlink = 1;
 428                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 429                 buf->st_size = fdata.nFileSizeLow |
 430                         (((off_t)fdata.nFileSizeHigh)<<32);
 431                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 432                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 433                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 434                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 435                 return 0;
 436         }
 437         errno = EBADF;
 438         return -1;
 439 }
 440
 441 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 442 {
 443         long long winTime = t * 10000000LL + 116444736000000000LL;
 444         ft->dwLowDateTime = winTime;
 445         ft->dwHighDateTime = winTime >> 32;
 446 }
 447
 448 int mingw_utime (const char *file_name, const struct utimbuf *times)
 449 {
 450         FILETIME mft, aft;
 451         int fh, rc;
 452
 453         /* must have write permission */
 454         if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0)
 455                 return -1;
 456
 457         time_t_to_filetime(times->modtime, &mft);
 458         time_t_to_filetime(times->actime, &aft);
 459         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 460                 errno = EINVAL;
 461                 rc = -1;
 462         } else
 463                 rc = 0;
 464         close(fh);
 465         return rc;
 466 }
 467
 468 unsigned int sleep (unsigned int seconds)
 469 {
 470         Sleep(seconds*1000);
 471         return 0;
 472 }
 473
 474 int mkstemp(char *template)
 475 {
 476         char *filename = mktemp(template);
 477         if (filename == NULL)
 478                 return -1;
 479         return open(filename, O_RDWR | O_CREAT | O_BINARY, 0600);
 480 }
 481
 482 int gettimeofday(struct timeval *tv, void *tz)
 483 {
 484         FILETIME ft;
 485         long long hnsec;
 486
 487         GetSystemTimeAsFileTime(&ft);
 488         hnsec = filetime_to_hnsec(&ft);
 489         tv->tv_sec = hnsec / 10000000;
 490         tv->tv_usec = (hnsec % 10000000) / 10;
 491         return 0;
 492 }
 493
 494 int pipe(int filedes[2])
 495 {
 496         HANDLE h[2];
 497
 498         /* this creates non-inheritable handles */
 499         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 500                 errno = err_win_to_posix(GetLastError());
 501                 return -1;
 502         }
 503         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 504         if (filedes[0] < 0) {
 505                 CloseHandle(h[0]);
 506                 CloseHandle(h[1]);
 507                 return -1;
 508         }
 509         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 510         if (filedes[0] < 0) {
 511                 close(filedes[0]);
 512                 CloseHandle(h[1]);
 513                 return -1;
 514         }
 515         return 0;
 516 }
 517
 518 int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 519 {
 520         int i, pending;
 521
 522         if (timeout >= 0) {
 523                 if (nfds == 0) {
 524                         Sleep(timeout);
 525                         return 0;
 526                 }
 527                 return errno = EINVAL, error("poll timeout not supported");
 528         }
 529
 530         /*
 531          * When there is only one fd to wait for, then we pretend that
 532          * input is available and let the actual wait happen when the
 533          * caller invokes read().
 534          */
 535         if (nfds == 1) {
 536                 if (!(ufds[0].events & POLLIN))
 537                         return errno = EINVAL, error("POLLIN not set");
 538                 ufds[0].revents = POLLIN;
 539                 return 0;
 540         }
 541
 542 repeat:
 543         pending = 0;
 544         for (i = 0; i < nfds; i++) {
 545                 DWORD avail = 0;
 546                 HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 547                 if (h == INVALID_HANDLE_VALUE)
 548                         return -1;      /* errno was set */
 549
 550                 if (!(ufds[i].events & POLLIN))
 551                         return errno = EINVAL, error("POLLIN not set");
 552
 553                 /* this emulation works only for pipes */
 554                 if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 555                         int err = GetLastError();
 556                         if (err == ERROR_BROKEN_PIPE) {
 557                                 ufds[i].revents = POLLHUP;
 558                                 pending++;
 559                         } else {
 560                                 errno = EINVAL;
 561                                 return error("PeekNamedPipe failed,"
 562                                         " GetLastError: %u", err);
 563                         }
 564                 } else if (avail) {
 565                         ufds[i].revents = POLLIN;
 566                         pending++;
 567                 } else
 568                         ufds[i].revents = 0;
 569         }
 570         if (!pending) {
 571                 /*
 572                  * The only times that we spin here is when the process
 573                  * that is connected through the pipes is waiting for
 574                  * its own input data to become available. But since
 575                  * the process (pack-objects) is itself CPU intensive,
 576                  * it will happily pick up the time slice that we are
 577                  * relinquishing here.
 578                  */
 579                 Sleep(0);
 580                 goto repeat;
 581         }
 582         return 0;
 583 }
 584
 585 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 586 {
 587         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 588         memcpy(result, gmtime(timep), sizeof(struct tm));
 589         return result;
 590 }
 591
 592 struct tm *localtime_r(const time_t *timep, struct tm *result)
 593 {
 594         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 595         memcpy(result, localtime(timep), sizeof(struct tm));
 596         return result;
 597 }
 598
 599 #undef getcwd
 600 char *mingw_getcwd(char *pointer, int len)
 601 {
 602         int i;
 603         char *ret = getcwd(pointer, len);
 604         if (!ret)
 605                 return ret;
 606         for (i = 0; pointer[i]; i++)
 607                 if (pointer[i] == '\\')
 608                         pointer[i] = '/';
 609         return ret;
 610 }
 611
 612 #undef getenv
 613 char *mingw_getenv(const char *name)
 614 {
 615         char *result = getenv(name);
 616         if (!result && !strcmp(name, "TMPDIR")) {
 617                 /* on Windows it is TMP and TEMP */
 618                 result = getenv("TMP");
 619                 if (!result)
 620                         result = getenv("TEMP");
 621         }
 622         return result;
 623 }
 624
 625 /*
 626  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 627  * (Parsing C++ Command-Line Arguments)
 628  */
 629 static const char *quote_arg(const char *arg)
 630 {
 631         /* count chars to quote */
 632         int len = 0, n = 0;
 633         int force_quotes = 0;
 634         char *q, *d;
 635         const char *p = arg;
 636         if (!*p) force_quotes = 1;
 637         while (*p) {
 638                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 639                         force_quotes = 1;
 640                 else if (*p == '"')
 641                         n++;
 642                 else if (*p == '\\') {
 643                         int count = 0;
 644                         while (*p == '\\') {
 645                                 count++;
 646                                 p++;
 647                                 len++;
 648                         }
 649                         if (*p == '"')
 650                                 n += count*2 + 1;
 651                         continue;
 652                 }
 653                 len++;
 654                 p++;
 655         }
 656         if (!force_quotes && n == 0)
 657                 return arg;
 658
 659         /* insert \ where necessary */
 660         d = q = xmalloc(len+n+3);
 661         *d++ = '"';
 662         while (*arg) {
 663                 if (*arg == '"')
 664                         *d++ = '\\';
 665                 else if (*arg == '\\') {
 666                         int count = 0;
 667                         while (*arg == '\\') {
 668                                 count++;
 669                                 *d++ = *arg++;
 670                         }
 671                         if (*arg == '"') {
 672                                 while (count-- > 0)
 673                                         *d++ = '\\';
 674                                 *d++ = '\\';
 675                         }
 676                 }
 677                 *d++ = *arg++;
 678         }
 679         *d++ = '"';
 680         *d++ = 0;
 681         return q;
 682 }
 683
 684 static const char *parse_interpreter(const char *cmd)
 685 {
 686         static char buf[100];
 687         char *p, *opt;
 688         int n, fd;
 689
 690         /* don't even try a .exe */
 691         n = strlen(cmd);
 692         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 693                 return NULL;
 694
 695         fd = open(cmd, O_RDONLY);
 696         if (fd < 0)
 697                 return NULL;
 698         n = read(fd, buf, sizeof(buf)-1);
 699         close(fd);
 700         if (n < 4)      /* at least '#!/x' and not error */
 701                 return NULL;
 702
 703         if (buf[0] != '#' || buf[1] != '!')
 704                 return NULL;
 705         buf[n] = '\0';
 706         p = buf + strcspn(buf, "\r\n");
 707         if (!*p)
 708                 return NULL;
 709
 710         *p = '\0';
 711         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 712                 return NULL;
 713         /* strip options */
 714         if ((opt = strchr(p+1, ' ')))
 715                 *opt = '\0';
 716         return p+1;
 717 }
 718
 719 /*
 720  * Splits the PATH into parts.
 721  */
 722 static char **get_path_split(void)
 723 {
 724         char *p, **path, *envpath = getenv("PATH");
 725         int i, n = 0;
 726
 727         if (!envpath || !*envpath)
 728                 return NULL;
 729
 730         envpath = xstrdup(envpath);
 731         p = envpath;
 732         while (p) {
 733                 char *dir = p;
 734                 p = strchr(p, ';');
 735                 if (p) *p++ = '\0';
 736                 if (*dir) {     /* not earlier, catches series of ; */
 737                         ++n;
 738                 }
 739         }
 740         if (!n)
 741                 return NULL;
 742
 743         path = xmalloc((n+1)*sizeof(char *));
 744         p = envpath;
 745         i = 0;
 746         do {
 747                 if (*p)
 748                         path[i++] = xstrdup(p);
 749                 p = p+strlen(p)+1;
 750         } while (i < n);
 751         path[i] = NULL;
 752
 753         free(envpath);
 754
 755         return path;
 756 }
 757
 758 static void free_path_split(char **path)
 759 {
 760         char **p = path;
 761
 762         if (!path)
 763                 return;
 764
 765         while (*p)
 766                 free(*p++);
 767         free(path);
 768 }
 769
 770 /*
 771  * exe_only means that we only want to detect .exe files, but not scripts
 772  * (which do not have an extension)
 773  */
 774 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 775 {
 776         char path[MAX_PATH];
 777         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 778
 779         if (!isexe && access(path, F_OK) == 0)
 780                 return xstrdup(path);
 781         path[strlen(path)-4] = '\0';
 782         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 783                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 784                         return xstrdup(path);
 785         return NULL;
 786 }
 787
 788 /*
 789  * Determines the absolute path of cmd using the the split path in path.
 790  * If cmd contains a slash or backslash, no lookup is performed.
 791  */
 792 static char *path_lookup(const char *cmd, char **path, int exe_only)
 793 {
 794         char *prog = NULL;
 795         int len = strlen(cmd);
 796         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 797
 798         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 799                 prog = xstrdup(cmd);
 800
 801         while (!prog && *path)
 802                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 803
 804         return prog;
 805 }
 806
 807 static int env_compare(const void *a, const void *b)
 808 {
 809         char *const *ea = a;
 810         char *const *eb = b;
 811         return strcasecmp(*ea, *eb);
 812 }
 813
 814 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 815                               int prepend_cmd, int fhin, int fhout, int fherr)
 816 {
 817         STARTUPINFO si;
 818         PROCESS_INFORMATION pi;
 819         struct strbuf envblk, args;
 820         unsigned flags;
 821         BOOL ret;
 822
 823         /* Determine whether or not we are associated to a console */
 824         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 825                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 826                         FILE_ATTRIBUTE_NORMAL, NULL);
 827         if (cons == INVALID_HANDLE_VALUE) {
 828                 /*
 829                  * There is no console associated with this process.
 830                  * Since the child is a console process, Windows
 831                  * would normally create a console window. But
 832                  * since we'll be redirecting std streams, we do
 833                  * not need the console.
 834                  * It is necessary to use DETACHED_PROCESS
 835                  * instead of CREATE_NO_WINDOW to make ssh
 836                  * recognize that it has no console.
 837                  */
 838                 flags = DETACHED_PROCESS;
 839         } else {
 840                 /*
 841                  * There is already a console. If we specified
 842                  * DETACHED_PROCESS here, too, Windows would
 843                  * disassociate the child from the console.
 844                  * The same is true for CREATE_NO_WINDOW.
 845                  * Go figure!
 846                  */
 847                 flags = 0;
 848                 CloseHandle(cons);
 849         }
 850         memset(&si, 0, sizeof(si));
 851         si.cb = sizeof(si);
 852         si.dwFlags = STARTF_USESTDHANDLES;
 853         si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 854         si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 855         si.hStdError = (HANDLE) _get_osfhandle(fherr);
 856
 857         /* concatenate argv, quoting args as we go */
 858         strbuf_init(&args, 0);
 859         if (prepend_cmd) {
 860                 char *quoted = (char *)quote_arg(cmd);
 861                 strbuf_addstr(&args, quoted);
 862                 if (quoted != cmd)
 863                         free(quoted);
 864         }
 865         for (; *argv; argv++) {
 866                 char *quoted = (char *)quote_arg(*argv);
 867                 if (*args.buf)
 868                         strbuf_addch(&args, ' ');
 869                 strbuf_addstr(&args, quoted);
 870                 if (quoted != *argv)
 871                         free(quoted);
 872         }
 873
 874         if (env) {
 875                 int count = 0;
 876                 char **e, **sorted_env;
 877
 878                 for (e = env; *e; e++)
 879                         count++;
 880
 881                 /* environment must be sorted */
 882                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 883                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 884                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 885
 886                 strbuf_init(&envblk, 0);
 887                 for (e = sorted_env; *e; e++) {
 888                         strbuf_addstr(&envblk, *e);
 889                         strbuf_addch(&envblk, '\0');
 890                 }
 891                 free(sorted_env);
 892         }
 893
 894         memset(&pi, 0, sizeof(pi));
 895         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 896                 env ? envblk.buf : NULL, NULL, &si, &pi);
 897
 898         if (env)
 899                 strbuf_release(&envblk);
 900         strbuf_release(&args);
 901
 902         if (!ret) {
 903                 errno = ENOENT;
 904                 return -1;
 905         }
 906         CloseHandle(pi.hThread);
 907         return (pid_t)pi.hProcess;
 908 }
 909
 910 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 911                            int prepend_cmd)
 912 {
 913         return mingw_spawnve_fd(cmd, argv, env, prepend_cmd, 0, 1, 2);
 914 }
 915
 916 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 917                      int fhin, int fhout, int fherr)
 918 {
 919         pid_t pid;
 920         char **path = get_path_split();
 921         char *prog = path_lookup(cmd, path, 0);
 922
 923         if (!prog) {
 924                 errno = ENOENT;
 925                 pid = -1;
 926         }
 927         else {
 928                 const char *interpr = parse_interpreter(prog);
 929
 930                 if (interpr) {
 931                         const char *argv0 = argv[0];
 932                         char *iprog = path_lookup(interpr, path, 1);
 933                         argv[0] = prog;
 934                         if (!iprog) {
 935                                 errno = ENOENT;
 936                                 pid = -1;
 937                         }
 938                         else {
 939                                 pid = mingw_spawnve_fd(iprog, argv, env, 1,
 940                                                        fhin, fhout, fherr);
 941                                 free(iprog);
 942                         }
 943                         argv[0] = argv0;
 944                 }
 945                 else
 946                         pid = mingw_spawnve_fd(prog, argv, env, 0,
 947                                                fhin, fhout, fherr);
 948                 free(prog);
 949         }
 950         free_path_split(path);
 951         return pid;
 952 }
 953
 954 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 955 {
 956         const char *interpr = parse_interpreter(cmd);
 957         char **path;
 958         char *prog;
 959         int pid = 0;
 960
 961         if (!interpr)
 962                 return 0;
 963         path = get_path_split();
 964         prog = path_lookup(interpr, path, 1);
 965         if (prog) {
 966                 int argc = 0;
 967                 const char **argv2;
 968                 while (argv[argc]) argc++;
 969                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
 970                 argv2[0] = (char *)cmd; /* full path to the script file */
 971                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 972                 pid = mingw_spawnve(prog, argv2, env, 1);
 973                 if (pid >= 0) {
 974                         int status;
 975                         if (waitpid(pid, &status, 0) < 0)
 976                                 status = 255;
 977                         exit(status);
 978                 }
 979                 pid = 1;        /* indicate that we tried but failed */
 980                 free(prog);
 981                 free(argv2);
 982         }
 983         free_path_split(path);
 984         return pid;
 985 }
 986
 987 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 988 {
 989         /* check if git_command is a shell script */
 990         if (!try_shell_exec(cmd, argv, (char **)env)) {
 991                 int pid, status;
 992
 993                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 994                 if (pid < 0)
 995                         return;
 996                 if (waitpid(pid, &status, 0) < 0)
 997                         status = 255;
 998                 exit(status);
 999         }
1000 }
1001
1002 void mingw_execvp(const char *cmd, char *const *argv)
1003 {
1004         char **path = get_path_split();
1005         char *prog = path_lookup(cmd, path, 0);
1006
1007         if (prog) {
1008                 mingw_execve(prog, argv, environ);
1009                 free(prog);
1010         } else
1011                 errno = ENOENT;
1012
1013         free_path_split(path);
1014 }
1015
1016 static char **copy_environ(void)
1017 {
1018         char **env;
1019         int i = 0;
1020         while (environ[i])
1021                 i++;
1022         env = xmalloc((i+1)*sizeof(*env));
1023         for (i = 0; environ[i]; i++)
1024                 env[i] = xstrdup(environ[i]);
1025         env[i] = NULL;
1026         return env;
1027 }
1028
1029 void free_environ(char **env)
1030 {
1031         int i;
1032         for (i = 0; env[i]; i++)
1033                 free(env[i]);
1034         free(env);
1035 }
1036
1037 static int lookup_env(char **env, const char *name, size_t nmln)
1038 {
1039         int i;
1040
1041         for (i = 0; env[i]; i++) {
1042                 if (0 == strncmp(env[i], name, nmln)
1043                     && '=' == env[i][nmln])
1044                         /* matches */
1045                         return i;
1046         }
1047         return -1;
1048 }
1049
1050 /*
1051  * If name contains '=', then sets the variable, otherwise it unsets it
1052  */
1053 static char **env_setenv(char **env, const char *name)
1054 {
1055         char *eq = strchrnul(name, '=');
1056         int i = lookup_env(env, name, eq-name);
1057
1058         if (i < 0) {
1059                 if (*eq) {
1060                         for (i = 0; env[i]; i++)
1061                                 ;
1062                         env = xrealloc(env, (i+2)*sizeof(*env));
1063                         env[i] = xstrdup(name);
1064                         env[i+1] = NULL;
1065                 }
1066         }
1067         else {
1068                 free(env[i]);
1069                 if (*eq)
1070                         env[i] = xstrdup(name);
1071                 else
1072                         for (; env[i]; i++)
1073                                 env[i] = env[i+1];
1074         }
1075         return env;
1076 }
1077
1078 /*
1079  * Copies global environ and adjusts variables as specified by vars.
1080  */
1081 char **make_augmented_environ(const char *const *vars)
1082 {
1083         char **env = copy_environ();
1084
1085         while (*vars)
1086                 env = env_setenv(env, *vars++);
1087         return env;
1088 }
1089
1090 /*
1091  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1092  * that service contains a numerical port, or that it it is null. It
1093  * does a simple search using gethostbyname, and returns one IPv4 host
1094  * if one was found.
1095  */
1096 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1097                                    const struct addrinfo *hints,
1098                                    struct addrinfo **res)
1099 {
1100         struct hostent *h = gethostbyname(node);
1101         struct addrinfo *ai;
1102         struct sockaddr_in *sin;
1103
1104         if (!h)
1105                 return WSAGetLastError();
1106
1107         ai = xmalloc(sizeof(struct addrinfo));
1108         *res = ai;
1109         ai->ai_flags = 0;
1110         ai->ai_family = AF_INET;
1111         ai->ai_socktype = hints->ai_socktype;
1112         switch (hints->ai_socktype) {
1113         case SOCK_STREAM:
1114                 ai->ai_protocol = IPPROTO_TCP;
1115                 break;
1116         case SOCK_DGRAM:
1117                 ai->ai_protocol = IPPROTO_UDP;
1118                 break;
1119         default:
1120                 ai->ai_protocol = 0;
1121                 break;
1122         }
1123         ai->ai_addrlen = sizeof(struct sockaddr_in);
1124         ai->ai_canonname = strdup(h->h_name);
1125
1126         sin = xmalloc(ai->ai_addrlen);
1127         memset(sin, 0, ai->ai_addrlen);
1128         sin->sin_family = AF_INET;
1129         if (service)
1130                 sin->sin_port = htons(atoi(service));
1131         sin->sin_addr = *(struct in_addr *)h->h_addr;
1132         ai->ai_addr = (struct sockaddr *)sin;
1133         ai->ai_next = 0;
1134         return 0;
1135 }
1136
1137 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1138 {
1139         free(res->ai_canonname);
1140         free(res->ai_addr);
1141         free(res);
1142 }
1143
1144 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1145                                    char *host, DWORD hostlen,
1146                                    char *serv, DWORD servlen, int flags)
1147 {
1148         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1149         if (sa->sa_family != AF_INET)
1150                 return EAI_FAMILY;
1151         if (!host && !serv)
1152                 return EAI_NONAME;
1153
1154         if (host && hostlen > 0) {
1155                 struct hostent *ent = NULL;
1156                 if (!(flags & NI_NUMERICHOST))
1157                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1158                                             sizeof(sin->sin_addr), AF_INET);
1159
1160                 if (ent)
1161                         snprintf(host, hostlen, "%s", ent->h_name);
1162                 else if (flags & NI_NAMEREQD)
1163                         return EAI_NONAME;
1164                 else
1165                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1166         }
1167
1168         if (serv && servlen > 0) {
1169                 struct servent *ent = NULL;
1170                 if (!(flags & NI_NUMERICSERV))
1171                         ent = getservbyport(sin->sin_port,
1172                                             flags & NI_DGRAM ? "udp" : "tcp");
1173
1174                 if (ent)
1175                         snprintf(serv, servlen, "%s", ent->s_name);
1176                 else
1177                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1178         }
1179
1180         return 0;
1181 }
1182
1183 static HMODULE ipv6_dll = NULL;
1184 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1185 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1186                                       const struct addrinfo *hints,
1187                                       struct addrinfo **res);
1188 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1189                                       char *host, DWORD hostlen,
1190                                       char *serv, DWORD servlen, int flags);
1191 /*
1192  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1193  * don't need to try to load that one dynamically.
1194  */
1195
1196 static void socket_cleanup(void)
1197 {
1198         WSACleanup();
1199         if (ipv6_dll)
1200                 FreeLibrary(ipv6_dll);
1201         ipv6_dll = NULL;
1202         ipv6_freeaddrinfo = freeaddrinfo_stub;
1203         ipv6_getaddrinfo = getaddrinfo_stub;
1204         ipv6_getnameinfo = getnameinfo_stub;
1205 }
1206
1207 static void ensure_socket_initialization(void)
1208 {
1209         WSADATA wsa;
1210         static int initialized = 0;
1211         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1212         const char **name;
1213
1214         if (initialized)
1215                 return;
1216
1217         if (WSAStartup(MAKEWORD(2,2), &wsa))
1218                 die("unable to initialize winsock subsystem, error %d",
1219                         WSAGetLastError());
1220
1221         for (name = libraries; *name; name++) {
1222                 ipv6_dll = LoadLibrary(*name);
1223                 if (!ipv6_dll)
1224                         continue;
1225
1226                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1227                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1228                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1229                                                    const struct addrinfo *,
1230                                                    struct addrinfo **))
1231                         GetProcAddress(ipv6_dll, "getaddrinfo");
1232                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1233                                                    socklen_t, char *, DWORD,
1234                                                    char *, DWORD, int))
1235                         GetProcAddress(ipv6_dll, "getnameinfo");
1236                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1237                         FreeLibrary(ipv6_dll);
1238                         ipv6_dll = NULL;
1239                 } else
1240                         break;
1241         }
1242         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1243                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1244                 ipv6_getaddrinfo = getaddrinfo_stub;
1245                 ipv6_getnameinfo = getnameinfo_stub;
1246         }
1247
1248         atexit(socket_cleanup);
1249         initialized = 1;
1250 }
1251
1252 #undef gethostbyname
1253 struct hostent *mingw_gethostbyname(const char *host)
1254 {
1255         ensure_socket_initialization();
1256         return gethostbyname(host);
1257 }
1258
1259 void mingw_freeaddrinfo(struct addrinfo *res)
1260 {
1261         ipv6_freeaddrinfo(res);
1262 }
1263
1264 int mingw_getaddrinfo(const char *node, const char *service,
1265                       const struct addrinfo *hints, struct addrinfo **res)
1266 {
1267         ensure_socket_initialization();
1268         return ipv6_getaddrinfo(node, service, hints, res);
1269 }
1270
1271 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1272                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1273                       int flags)
1274 {
1275         ensure_socket_initialization();
1276         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1277 }
1278
1279 int mingw_socket(int domain, int type, int protocol)
1280 {
1281         int sockfd;
1282         SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
1283         if (s == INVALID_SOCKET) {
1284                 /*
1285                  * WSAGetLastError() values are regular BSD error codes
1286                  * biased by WSABASEERR.
1287                  * However, strerror() does not know about networking
1288                  * specific errors, which are values beginning at 38 or so.
1289                  * Therefore, we choose to leave the biased error code
1290                  * in errno so that _if_ someone looks up the code somewhere,
1291                  * then it is at least the number that are usually listed.
1292                  */
1293                 errno = WSAGetLastError();
1294                 return -1;
1295         }
1296         /* convert into a file descriptor */
1297         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1298                 closesocket(s);
1299                 return error("unable to make a socket file descriptor: %s",
1300                         strerror(errno));
1301         }
1302         return sockfd;
1303 }
1304
1305 #undef connect
1306 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1307 {
1308         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1309         return connect(s, sa, sz);
1310 }
1311
1312 #undef rename
1313 int mingw_rename(const char *pold, const char *pnew)
1314 {
1315         DWORD attrs, gle;
1316         int tries = 0;
1317
1318         /*
1319          * Try native rename() first to get errno right.
1320          * It is based on MoveFile(), which cannot overwrite existing files.
1321          */
1322         if (!rename(pold, pnew))
1323                 return 0;
1324         if (errno != EEXIST)
1325                 return -1;
1326 repeat:
1327         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1328                 return 0;
1329         /* TODO: translate more errors */
1330         gle = GetLastError();
1331         if (gle == ERROR_ACCESS_DENIED &&
1332             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1333                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1334                         errno = EISDIR;
1335                         return -1;
1336                 }
1337                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1338                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1339                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1340                                 return 0;
1341                         gle = GetLastError();
1342                         /* revert file attributes on failure */
1343                         SetFileAttributes(pnew, attrs);
1344                 }
1345         }
1346         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1347                 /*
1348                  * We assume that some other process had the source or
1349                  * destination file open at the wrong moment and retry.
1350                  * In order to give the other process a higher chance to
1351                  * complete its operation, we give up our time slice now.
1352                  * If we have to retry again, we do sleep a bit.
1353                  */
1354                 Sleep(delay[tries]);
1355                 tries++;
1356                 goto repeat;
1357         }
1358         if (gle == ERROR_ACCESS_DENIED &&
1359                ask_user_yes_no("Rename from '%s' to '%s' failed. "
1360                        "Should I try again?", pold, pnew))
1361                 goto repeat;
1362
1363         errno = EACCES;
1364         return -1;
1365 }
1366
1367 /*
1368  * Note that this doesn't return the actual pagesize, but
1369  * the allocation granularity. If future Windows specific git code
1370  * needs the real getpagesize function, we need to find another solution.
1371  */
1372 int mingw_getpagesize(void)
1373 {
1374         SYSTEM_INFO si;
1375         GetSystemInfo(&si);
1376         return si.dwAllocationGranularity;
1377 }
1378
1379 struct passwd *getpwuid(int uid)
1380 {
1381         static char user_name[100];
1382         static struct passwd p;
1383
1384         DWORD len = sizeof(user_name);
1385         if (!GetUserName(user_name, &len))
1386                 return NULL;
1387         p.pw_name = user_name;
1388         p.pw_gecos = "unknown";
1389         p.pw_dir = NULL;
1390         return &p;
1391 }
1392
1393 static HANDLE timer_event;
1394 static HANDLE timer_thread;
1395 static int timer_interval;
1396 static int one_shot;
1397 static sig_handler_t timer_fn = SIG_DFL;
1398
1399 /*
1400  * The timer works like this:
1401  * The thread, ticktack(), is a trivial routine that most of the time
1402  * only waits to receive the signal to terminate. The main thread tells
1403  * the thread to terminate by setting the timer_event to the signalled
1404  * state.
1405  * But ticktack() interrupts the wait state after the timer's interval
1406  * length to call the signal handler.
1407  */
1408
1409 static unsigned __stdcall ticktack(void *dummy)
1410 {
1411         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1412                 if (timer_fn == SIG_DFL)
1413                         die("Alarm");
1414                 if (timer_fn != SIG_IGN)
1415                         timer_fn(SIGALRM);
1416                 if (one_shot)
1417                         break;
1418         }
1419         return 0;
1420 }
1421
1422 static int start_timer_thread(void)
1423 {
1424         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1425         if (timer_event) {
1426                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1427                 if (!timer_thread )
1428                         return errno = ENOMEM,
1429                                 error("cannot start timer thread");
1430         } else
1431                 return errno = ENOMEM,
1432                         error("cannot allocate resources for timer");
1433         return 0;
1434 }
1435
1436 static void stop_timer_thread(void)
1437 {
1438         if (timer_event)
1439                 SetEvent(timer_event);  /* tell thread to terminate */
1440         if (timer_thread) {
1441                 int rc = WaitForSingleObject(timer_thread, 1000);
1442                 if (rc == WAIT_TIMEOUT)
1443                         error("timer thread did not terminate timely");
1444                 else if (rc != WAIT_OBJECT_0)
1445                         error("waiting for timer thread failed: %lu",
1446                               GetLastError());
1447                 CloseHandle(timer_thread);
1448         }
1449         if (timer_event)
1450                 CloseHandle(timer_event);
1451         timer_event = NULL;
1452         timer_thread = NULL;
1453 }
1454
1455 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1456 {
1457         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1458 }
1459
1460 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1461 {
1462         static const struct timeval zero;
1463         static int atexit_done;
1464
1465         if (out != NULL)
1466                 return errno = EINVAL,
1467                         error("setitimer param 3 != NULL not implemented");
1468         if (!is_timeval_eq(&in->it_interval, &zero) &&
1469             !is_timeval_eq(&in->it_interval, &in->it_value))
1470                 return errno = EINVAL,
1471                         error("setitimer: it_interval must be zero or eq it_value");
1472
1473         if (timer_thread)
1474                 stop_timer_thread();
1475
1476         if (is_timeval_eq(&in->it_value, &zero) &&
1477             is_timeval_eq(&in->it_interval, &zero))
1478                 return 0;
1479
1480         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1481         one_shot = is_timeval_eq(&in->it_interval, &zero);
1482         if (!atexit_done) {
1483                 atexit(stop_timer_thread);
1484                 atexit_done = 1;
1485         }
1486         return start_timer_thread();
1487 }
1488
1489 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1490 {
1491         if (sig != SIGALRM)
1492                 return errno = EINVAL,
1493                         error("sigaction only implemented for SIGALRM");
1494         if (out != NULL)
1495                 return errno = EINVAL,
1496                         error("sigaction: param 3 != NULL not implemented");
1497
1498         timer_fn = in->sa_handler;
1499         return 0;
1500 }
1501
1502 #undef signal
1503 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1504 {
1505         sig_handler_t old = timer_fn;
1506         if (sig != SIGALRM)
1507                 return signal(sig, handler);
1508         timer_fn = handler;
1509         return old;
1510 }
1511
1512 static const char *make_backslash_path(const char *path, char *buf)
1513 {
1514         char *c;
1515
1516         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1517                 die("Too long path: %.*s", 60, path);
1518
1519         for (c = buf; *c; c++) {
1520                 if (*c == '/')
1521                         *c = '\\';
1522         }
1523         return buf;
1524 }
1525
1526 void mingw_open_html(const char *unixpath)
1527 {
1528         char buf[PATH_MAX + 1];
1529         const char *htmlpath = make_backslash_path(unixpath, buf);
1530         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1531                         const char *, const char *, const char *, INT);
1532         T ShellExecute;
1533         HMODULE shell32;
1534
1535         shell32 = LoadLibrary("shell32.dll");
1536         if (!shell32)
1537                 die("cannot load shell32.dll");
1538         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1539         if (!ShellExecute)
1540                 die("cannot run browser");
1541
1542         printf("Launching default browser to display HTML ...\n");
1543         ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1544
1545         FreeLibrary(shell32);
1546 }
1547
1548 int link(const char *oldpath, const char *newpath)
1549 {
1550         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1551         static T create_hard_link = NULL;
1552         if (!create_hard_link) {
1553                 create_hard_link = (T) GetProcAddress(
1554                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1555                 if (!create_hard_link)
1556                         create_hard_link = (T)-1;
1557         }
1558         if (create_hard_link == (T)-1) {
1559                 errno = ENOSYS;
1560                 return -1;
1561         }
1562         if (!create_hard_link(newpath, oldpath, NULL)) {
1563                 errno = err_win_to_posix(GetLastError());
1564                 return -1;
1565         }
1566         return 0;
1567 }
1568
1569 int symlink(const char *oldpath, const char *newpath)
1570 {
1571         typedef BOOL WINAPI (*symlink_fn)(const char*, const char*, DWORD);
1572         static symlink_fn create_symbolic_link = NULL;
1573         char buf[PATH_MAX + 1];
1574
1575         if (!create_symbolic_link) {
1576                 create_symbolic_link = (symlink_fn) GetProcAddress(
1577                                 GetModuleHandle("kernel32.dll"), "CreateSymbolicLinkA");
1578                 if (!create_symbolic_link)
1579                         create_symbolic_link = (symlink_fn)-1;
1580         }
1581         if (create_symbolic_link == (symlink_fn)-1) {
1582                 errno = ENOSYS;
1583                 return -1;
1584         }
1585
1586         if (!create_symbolic_link(newpath, make_backslash_path(oldpath, buf), 0)) {
1587                 errno = err_win_to_posix(GetLastError());
1588                 return -1;
1589         }
1590         return 0;
1591 }
1592
1593 int readlink(const char *path, char *buf, size_t bufsiz)
1594 {
1595         HANDLE handle = CreateFile(path, GENERIC_READ,
1596                         FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE,
1597                         NULL, OPEN_EXISTING,
1598                         FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OPEN_REPARSE_POINT,
1599                         NULL);
1600
1601         if (handle != INVALID_HANDLE_VALUE) {
1602                 unsigned char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
1603                 DWORD dummy = 0;
1604                 if (DeviceIoControl(handle, FSCTL_GET_REPARSE_POINT, NULL, 0, buffer,
1605                         MAXIMUM_REPARSE_DATA_BUFFER_SIZE, &dummy, NULL)) {
1606                         REPARSE_DATA_BUFFER *b = (REPARSE_DATA_BUFFER *) buffer;
1607                         if (b->ReparseTag == IO_REPARSE_TAG_SYMLINK) {
1608                                 int len = b->SymbolicLinkReparseBuffer.SubstituteNameLength / sizeof(wchar_t);
1609                                 int offset = b->SymbolicLinkReparseBuffer.SubstituteNameOffset / sizeof(wchar_t);
1610                                 int i;
1611                                 snprintf(buf, bufsiz, "%*ls", len,  & b->SymbolicLinkReparseBuffer.PathBuffer[offset]);
1612                                 for (i = 0; i < len; i++)
1613                                         if (buf[i] == '\\')
1614                                                 buf[i] = '/';
1615                                 CloseHandle(handle);
1616                                 return len;
1617                         }
1618                 }
1619
1620                 CloseHandle(handle);
1621         }
1622
1623         errno = EINVAL;
1624         return -1;
1625 }
1626
1627 char *getpass(const char *prompt)
1628 {
1629         struct strbuf buf = STRBUF_INIT;
1630
1631         fputs(prompt, stderr);
1632         for (;;) {
1633                 char c = _getch();
1634                 if (c == '\r' || c == '\n')
1635                         break;
1636                 strbuf_addch(&buf, c);
1637         }
1638         fputs("\n", stderr);
1639         return strbuf_detach(&buf, NULL);
1640 }
1641
1642 #ifndef NO_MINGW_REPLACE_READDIR
1643 /* MinGW readdir implementation to avoid extra lstats for Git */
1644 struct mingw_DIR
1645 {
1646         struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1647         struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1648         long                    dd_handle;      /* _findnext handle */
1649         int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1650         char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1651 };
1652
1653 struct dirent *mingw_readdir(DIR *dir)
1654 {
1655         WIN32_FIND_DATAA buf;
1656         HANDLE handle;
1657         struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1658
1659         if (!dir->dd_handle) {
1660                 errno = EBADF; /* No set_errno for mingw */
1661                 return NULL;
1662         }
1663
1664         if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1665         {
1666                 DWORD lasterr;
1667                 handle = FindFirstFileA(dir->dd_name, &buf);
1668                 lasterr = GetLastError();
1669                 dir->dd_handle = (long)handle;
1670                 if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1671                         errno = err_win_to_posix(lasterr);
1672                         return NULL;
1673                 }
1674         } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1675                 return NULL;
1676         } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1677                 DWORD lasterr = GetLastError();
1678                 FindClose((HANDLE)dir->dd_handle);
1679                 dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1680                 /*
1681                  * POSIX says you shouldn't set errno when readdir can't
1682                  * find any more files; so, if another error we leave it set.
1683                  */
1684                 if (lasterr != ERROR_NO_MORE_FILES)
1685                         errno = err_win_to_posix(lasterr);
1686                 return NULL;
1687         }
1688
1689         /* We get here if `buf' contains valid data.  */
1690         strcpy(dir->dd_dir.d_name, buf.cFileName);
1691         ++dir->dd_stat;
1692
1693         /* Set file type, based on WIN32_FIND_DATA */
1694         mdir->dd_dir.d_type = 0;
1695         if ((buf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
1696                         (buf.dwReserved0 == IO_REPARSE_TAG_SYMLINK))
1697                 mdir->dd_dir.d_type |= DT_LNK;
1698         else if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1699                 mdir->dd_dir.d_type |= DT_DIR;
1700         else
1701                 mdir->dd_dir.d_type |= DT_REG;
1702
1703         return (struct dirent*)&dir->dd_dir;
1704 }
1705 #endif // !NO_MINGW_REPLACE_READDIR