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