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 && !is_bare_repository() &&
 136             make_hidden(dir))
 137                 warning("Failed to make '%s' hidden", dir);
 138         git_config_set("core.hideDotFiles",
 139                 hide_dotfiles == HIDE_DOTFILES_FALSE ? "false" :
 140                 (hide_dotfiles == HIDE_DOTFILES_DOTGITONLY ?
 141                  "dotGitOnly" : "true"));
 142 }
 143
 144 #undef mkdir
 145 int mingw_mkdir(const char *path, int mode)
 146 {
 147         int ret = mkdir(path);
 148         if (!ret && hide_dotfiles == HIDE_DOTFILES_TRUE) {
 149                 /*
 150                  * In Windows a file or dir starting with a dot is not
 151                  * automatically hidden. So lets mark it as hidden when
 152                  * such a directory is created.
 153                  */
 154                 const char *start = basename((char*)path);
 155                 if (*start == '.')
 156                         return make_hidden(path);
 157         }
 158         return ret;
 159 }
 160
 161 static int ask_user_yes_no(const char *format, ...)
 162 {
 163         char answer[5];
 164         char question[4096];
 165         const char *retry_hook[] = { NULL, NULL, NULL };
 166         va_list args;
 167
 168         if ((retry_hook[0] = getenv("GIT_ASK_YESNO"))) {
 169
 170                 va_start(args, format);
 171                 vsnprintf(question, sizeof(question), format, args);
 172                 va_end(args);
 173
 174                 retry_hook[1] = question;
 175                 return !run_command_v_opt(retry_hook, 0);
 176         }
 177
 178         if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
 179                 return 0;
 180
 181         while (1) {
 182                 va_start(args, format);
 183                 vfprintf(stderr, format, args);
 184                 va_end(args);
 185                 fprintf(stderr, " (y/n)? ");
 186
 187                 if (fgets(answer, sizeof(answer), stdin)) {
 188                         /* remove the newline */
 189                         if (answer[strlen(answer)-2] == '\r')
 190                                 answer[strlen(answer)-2] = '\0';
 191                         if (answer[strlen(answer)-1] == '\n')
 192                                 answer[strlen(answer)-1] = '\0';
 193                 } else
 194                         return 0;
 195
 196                 if (answer[0] == 'y' && strlen(answer) == 1)
 197                         return 1;
 198                 if (!strncasecmp(answer, "yes", sizeof(answer)))
 199                         return 1;
 200                 if (answer[0] == 'n' && strlen(answer) == 1)
 201                         return 0;
 202                 if (!strncasecmp(answer, "no", sizeof(answer)))
 203                         return 0;
 204                 fprintf(stderr, "I did not understand your answer: '%s'\n",
 205                                 answer);
 206         }
 207 }
 208
 209 #undef unlink
 210 int mingw_unlink(const char *pathname)
 211 {
 212         int ret, tries = 0;
 213
 214         /* read-only files cannot be removed */
 215         chmod(pathname, 0666);
 216         while ((ret = unlink(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 217                 if (errno != EACCES)
 218                         break;
 219                 /*
 220                  * We assume that some other process had the source or
 221                  * destination file open at the wrong moment and retry.
 222                  * In order to give the other process a higher chance to
 223                  * complete its operation, we give up our time slice now.
 224                  * If we have to retry again, we do sleep a bit.
 225                  */
 226                 Sleep(delay[tries]);
 227                 tries++;
 228         }
 229         while (ret == -1 && errno == EACCES &&
 230                ask_user_yes_no("Unlink of file '%s' failed. "
 231                         "Should I try again?", pathname))
 232                ret = unlink(pathname);
 233         return ret;
 234 }
 235
 236 static int is_dir_empty(const char *path)
 237 {
 238         struct strbuf buf = STRBUF_INIT;
 239         WIN32_FIND_DATAA findbuf;
 240         HANDLE handle;
 241
 242         strbuf_addf(&buf, "%s\\*", path);
 243         handle = FindFirstFileA(buf.buf, &findbuf);
 244         if (handle == INVALID_HANDLE_VALUE) {
 245                 strbuf_release(&buf);
 246                 return GetLastError() == ERROR_NO_MORE_FILES;
 247         }
 248
 249         while (!strcmp(findbuf.cFileName, ".") ||
 250                         !strcmp(findbuf.cFileName, ".."))
 251                 if (!FindNextFile(handle, &findbuf)) {
 252                         strbuf_release(&buf);
 253                         return GetLastError() == ERROR_NO_MORE_FILES;
 254                 }
 255         FindClose(handle);
 256         strbuf_release(&buf);
 257         return 0;
 258 }
 259
 260 #undef rmdir
 261 int mingw_rmdir(const char *pathname)
 262 {
 263         int ret, tries = 0;
 264
 265         while ((ret = rmdir(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 266                 if (errno != EACCES)
 267                         break;
 268                 if (!is_dir_empty(pathname)) {
 269                         errno = ENOTEMPTY;
 270                         break;
 271                 }
 272                 /*
 273                  * We assume that some other process had the source or
 274                  * destination file open at the wrong moment and retry.
 275                  * In order to give the other process a higher chance to
 276                  * complete its operation, we give up our time slice now.
 277                  * If we have to retry again, we do sleep a bit.
 278                  */
 279                 Sleep(delay[tries]);
 280                 tries++;
 281         }
 282         while (ret == -1 && errno == EACCES &&
 283                ask_user_yes_no("Deletion of directory '%s' failed. "
 284                         "Should I try again?", pathname))
 285                ret = rmdir(pathname);
 286         return ret;
 287 }
 288
 289 #undef open
 290 int mingw_open (const char *filename, int oflags, ...)
 291 {
 292         va_list args;
 293         unsigned mode;
 294         int fd;
 295
 296         va_start(args, oflags);
 297         mode = va_arg(args, int);
 298         va_end(args);
 299
 300         if (filename && !strcmp(filename, "/dev/null"))
 301                 filename = "nul";
 302
 303         fd = open(filename, oflags, mode);
 304
 305         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 306                 DWORD attrs = GetFileAttributes(filename);
 307                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 308                         errno = EISDIR;
 309         }
 310         if ((oflags & O_CREAT) && fd >= 0 &&
 311             hide_dotfiles == HIDE_DOTFILES_TRUE) {
 312                 /*
 313                  * In Windows a file or dir starting with a dot is not
 314                  * automatically hidden. So lets mark it as hidden when
 315                  * such a file is created.
 316                  */
 317                 const char *start = basename((char*)filename);
 318                 if (*start == '.' && make_hidden(filename))
 319                         warning("Could not mark '%s' as hidden.", filename);
 320         }
 321         return fd;
 322 }
 323
 324 #undef write
 325 ssize_t mingw_write(int fd, const void *buf, size_t count)
 326 {
 327         /*
 328          * While write() calls to a file on a local disk are translated
 329          * into WriteFile() calls with a maximum size of 64KB on Windows
 330          * XP and 256KB on Vista, no such cap is placed on writes to
 331          * files over the network on Windows XP.  Unfortunately, there
 332          * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 333          * bigger writes fail on Windows XP.
 334          * So we cap to a nice 31MB here to avoid write failures over
 335          * the net without changing the number of WriteFile() calls in
 336          * the local case.
 337          */
 338         return write(fd, buf, min(count, 31 * 1024 * 1024));
 339 }
 340
 341 #undef fopen
 342 FILE *mingw_fopen (const char *filename, const char *otype)
 343 {
 344         int hide = 0;
 345         FILE *file;
 346         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 347             basename((char*)filename)[0] == '.')
 348                 hide = access(filename, F_OK);
 349         if (filename && !strcmp(filename, "/dev/null"))
 350                 filename = "nul";
 351         file = fopen(filename, otype);
 352         if (file && hide && make_hidden(filename))
 353                 warning("Could not mark '%s' as hidden.", filename);
 354         return file;
 355 }
 356
 357 #undef freopen
 358 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 359 {
 360         int hide = 0;
 361         FILE *file;
 362         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 363             basename((char*)filename)[0] == '.')
 364                 hide = access(filename, F_OK);
 365         if (filename && !strcmp(filename, "/dev/null"))
 366                 filename = "nul";
 367         file = freopen(filename, otype, stream);
 368         if (file && hide && make_hidden(filename))
 369                 warning("Could not mark '%s' as hidden.", filename);
 370         return file;
 371 }
 372
 373 /*
 374  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 375  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 376  */
 377 static inline long long filetime_to_hnsec(const FILETIME *ft)
 378 {
 379         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 380         /* Windows to Unix Epoch conversion */
 381         return winTime - 116444736000000000LL;
 382 }
 383
 384 static inline time_t filetime_to_time_t(const FILETIME *ft)
 385 {
 386         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 387 }
 388
 389 /* We keep the do_lstat code in a separate function to avoid recursion.
 390  * When a path ends with a slash, the stat will fail with ENOENT. In
 391  * this case, we strip the trailing slashes and stat again.
 392  *
 393  * If follow is true then act like stat() and report on the link
 394  * target. Otherwise report on the link itself.
 395  */
 396 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 397 {
 398         int err;
 399         WIN32_FILE_ATTRIBUTE_DATA fdata;
 400
 401         if (!(err = get_file_attr(file_name, &fdata))) {
 402                 buf->st_ino = 0;
 403                 buf->st_gid = 0;
 404                 buf->st_uid = 0;
 405                 buf->st_nlink = 1;
 406                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 407                 buf->st_size = fdata.nFileSizeLow |
 408                         (((off_t)fdata.nFileSizeHigh)<<32);
 409                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 410                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 411                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 412                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 413                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 414                         WIN32_FIND_DATAA findbuf;
 415                         HANDLE handle = FindFirstFileA(file_name, &findbuf);
 416                         if (handle != INVALID_HANDLE_VALUE) {
 417                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 418                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 419                                         if (follow) {
 420                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 421                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 422                                         } else {
 423                                                 buf->st_mode = S_IFLNK;
 424                                         }
 425                                         buf->st_mode |= S_IREAD;
 426                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 427                                                 buf->st_mode |= S_IWRITE;
 428                                 }
 429                                 FindClose(handle);
 430                         }
 431                 }
 432                 return 0;
 433         }
 434         errno = err;
 435         return -1;
 436 }
 437
 438 /* We provide our own lstat/fstat functions, since the provided
 439  * lstat/fstat functions are so slow. These stat functions are
 440  * tailored for Git's usage (read: fast), and are not meant to be
 441  * complete. Note that Git stat()s are redirected to mingw_lstat()
 442  * too, since Windows doesn't really handle symlinks that well.
 443  */
 444 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 445 {
 446         int namelen;
 447         static char alt_name[PATH_MAX];
 448
 449         if (!do_lstat(follow, file_name, buf))
 450                 return 0;
 451
 452         /* if file_name ended in a '/', Windows returned ENOENT;
 453          * try again without trailing slashes
 454          */
 455         if (errno != ENOENT)
 456                 return -1;
 457
 458         namelen = strlen(file_name);
 459         if (namelen && file_name[namelen-1] != '/')
 460                 return -1;
 461         while (namelen && file_name[namelen-1] == '/')
 462                 --namelen;
 463         if (!namelen || namelen >= PATH_MAX)
 464                 return -1;
 465
 466         memcpy(alt_name, file_name, namelen);
 467         alt_name[namelen] = 0;
 468         return do_lstat(follow, alt_name, buf);
 469 }
 470
 471 int mingw_lstat(const char *file_name, struct stat *buf)
 472 {
 473         return do_stat_internal(0, file_name, buf);
 474 }
 475 int mingw_stat(const char *file_name, struct stat *buf)
 476 {
 477         return do_stat_internal(1, file_name, buf);
 478 }
 479
 480 #undef fstat
 481 int mingw_fstat(int fd, struct stat *buf)
 482 {
 483         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 484         BY_HANDLE_FILE_INFORMATION fdata;
 485
 486         if (fh == INVALID_HANDLE_VALUE) {
 487                 errno = EBADF;
 488                 return -1;
 489         }
 490         /* direct non-file handles to MS's fstat() */
 491         if (GetFileType(fh) != FILE_TYPE_DISK)
 492                 return _fstati64(fd, buf);
 493
 494         if (GetFileInformationByHandle(fh, &fdata)) {
 495                 buf->st_ino = 0;
 496                 buf->st_gid = 0;
 497                 buf->st_uid = 0;
 498                 buf->st_nlink = 1;
 499                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 500                 buf->st_size = fdata.nFileSizeLow |
 501                         (((off_t)fdata.nFileSizeHigh)<<32);
 502                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 503                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 504                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 505                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 506                 return 0;
 507         }
 508         errno = EBADF;
 509         return -1;
 510 }
 511
 512 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 513 {
 514         long long winTime = t * 10000000LL + 116444736000000000LL;
 515         ft->dwLowDateTime = winTime;
 516         ft->dwHighDateTime = winTime >> 32;
 517 }
 518
 519 int mingw_utime (const char *file_name, const struct utimbuf *times)
 520 {
 521         FILETIME mft, aft;
 522         int fh, rc;
 523
 524         /* must have write permission */
 525         DWORD attrs = GetFileAttributes(file_name);
 526         if (attrs != INVALID_FILE_ATTRIBUTES &&
 527             (attrs & FILE_ATTRIBUTE_READONLY)) {
 528                 /* ignore errors here; open() will report them */
 529                 SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 530         }
 531
 532         if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 533                 rc = -1;
 534                 goto revert_attrs;
 535         }
 536
 537         if (times) {
 538                 time_t_to_filetime(times->modtime, &mft);
 539                 time_t_to_filetime(times->actime, &aft);
 540         } else {
 541                 GetSystemTimeAsFileTime(&mft);
 542                 aft = mft;
 543         }
 544         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 545                 errno = EINVAL;
 546                 rc = -1;
 547         } else
 548                 rc = 0;
 549         close(fh);
 550
 551 revert_attrs:
 552         if (attrs != INVALID_FILE_ATTRIBUTES &&
 553             (attrs & FILE_ATTRIBUTE_READONLY)) {
 554                 /* ignore errors again */
 555                 SetFileAttributes(file_name, attrs);
 556         }
 557         return rc;
 558 }
 559
 560 unsigned int sleep (unsigned int seconds)
 561 {
 562         Sleep(seconds*1000);
 563         return 0;
 564 }
 565
 566 int mkstemp(char *template)
 567 {
 568         char *filename = mktemp(template);
 569         if (filename == NULL)
 570                 return -1;
 571         return open(filename, O_RDWR | O_CREAT, 0600);
 572 }
 573
 574 int gettimeofday(struct timeval *tv, void *tz)
 575 {
 576         FILETIME ft;
 577         long long hnsec;
 578
 579         GetSystemTimeAsFileTime(&ft);
 580         hnsec = filetime_to_hnsec(&ft);
 581         tv->tv_sec = hnsec / 10000000;
 582         tv->tv_usec = (hnsec % 10000000) / 10;
 583         return 0;
 584 }
 585
 586 int pipe(int filedes[2])
 587 {
 588         HANDLE h[2];
 589
 590         /* this creates non-inheritable handles */
 591         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 592                 errno = err_win_to_posix(GetLastError());
 593                 return -1;
 594         }
 595         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 596         if (filedes[0] < 0) {
 597                 CloseHandle(h[0]);
 598                 CloseHandle(h[1]);
 599                 return -1;
 600         }
 601         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 602         if (filedes[0] < 0) {
 603                 close(filedes[0]);
 604                 CloseHandle(h[1]);
 605                 return -1;
 606         }
 607         return 0;
 608 }
 609
 610 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 611 {
 612         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 613         memcpy(result, gmtime(timep), sizeof(struct tm));
 614         return result;
 615 }
 616
 617 struct tm *localtime_r(const time_t *timep, struct tm *result)
 618 {
 619         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 620         memcpy(result, localtime(timep), sizeof(struct tm));
 621         return result;
 622 }
 623
 624 #undef getcwd
 625 char *mingw_getcwd(char *pointer, int len)
 626 {
 627         int i;
 628         char *ret = getcwd(pointer, len);
 629         if (!ret)
 630                 return ret;
 631         for (i = 0; pointer[i]; i++)
 632                 if (pointer[i] == '\\')
 633                         pointer[i] = '/';
 634         return ret;
 635 }
 636
 637 #undef getenv
 638 char *mingw_getenv(const char *name)
 639 {
 640         char *result = getenv(name);
 641         if (!result) {
 642                 if (!strcmp(name, "TMPDIR")) {
 643                         /* on Windows it is TMP and TEMP */
 644                         result = getenv("TMP");
 645                         if (!result)
 646                                 result = getenv("TEMP");
 647                 } else if (!strcmp(name, "TERM")) {
 648                         /* simulate TERM to enable auto-color (see color.c) */
 649                         result = "winansi";
 650                 }
 651         }
 652         return result;
 653 }
 654
 655 /*
 656  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 657  * (Parsing C++ Command-Line Arguments)
 658  */
 659 static const char *quote_arg(const char *arg)
 660 {
 661         /* count chars to quote */
 662         int len = 0, n = 0;
 663         int force_quotes = 0;
 664         char *q, *d;
 665         const char *p = arg;
 666         if (!*p) force_quotes = 1;
 667         while (*p) {
 668                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 669                         force_quotes = 1;
 670                 else if (*p == '"')
 671                         n++;
 672                 else if (*p == '\\') {
 673                         int count = 0;
 674                         while (*p == '\\') {
 675                                 count++;
 676                                 p++;
 677                                 len++;
 678                         }
 679                         if (*p == '"')
 680                                 n += count*2 + 1;
 681                         continue;
 682                 }
 683                 len++;
 684                 p++;
 685         }
 686         if (!force_quotes && n == 0)
 687                 return arg;
 688
 689         /* insert \ where necessary */
 690         d = q = xmalloc(len+n+3);
 691         *d++ = '"';
 692         while (*arg) {
 693                 if (*arg == '"')
 694                         *d++ = '\\';
 695                 else if (*arg == '\\') {
 696                         int count = 0;
 697                         while (*arg == '\\') {
 698                                 count++;
 699                                 *d++ = *arg++;
 700                         }
 701                         if (*arg == '"') {
 702                                 while (count-- > 0)
 703                                         *d++ = '\\';
 704                                 *d++ = '\\';
 705                         }
 706                 }
 707                 *d++ = *arg++;
 708         }
 709         *d++ = '"';
 710         *d++ = 0;
 711         return q;
 712 }
 713
 714 static const char *parse_interpreter(const char *cmd)
 715 {
 716         static char buf[100];
 717         char *p, *opt;
 718         int n, fd;
 719
 720         /* don't even try a .exe */
 721         n = strlen(cmd);
 722         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 723                 return NULL;
 724
 725         fd = open(cmd, O_RDONLY);
 726         if (fd < 0)
 727                 return NULL;
 728         n = read(fd, buf, sizeof(buf)-1);
 729         close(fd);
 730         if (n < 4)      /* at least '#!/x' and not error */
 731                 return NULL;
 732
 733         if (buf[0] != '#' || buf[1] != '!')
 734                 return NULL;
 735         buf[n] = '\0';
 736         p = buf + strcspn(buf, "\r\n");
 737         if (!*p)
 738                 return NULL;
 739
 740         *p = '\0';
 741         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 742                 return NULL;
 743         /* strip options */
 744         if ((opt = strchr(p+1, ' ')))
 745                 *opt = '\0';
 746         return p+1;
 747 }
 748
 749 /*
 750  * Splits the PATH into parts.
 751  */
 752 static char **get_path_split(void)
 753 {
 754         char *p, **path, *envpath = getenv("PATH");
 755         int i, n = 0;
 756
 757         if (!envpath || !*envpath)
 758                 return NULL;
 759
 760         envpath = xstrdup(envpath);
 761         p = envpath;
 762         while (p) {
 763                 char *dir = p;
 764                 p = strchr(p, ';');
 765                 if (p) *p++ = '\0';
 766                 if (*dir) {     /* not earlier, catches series of ; */
 767                         ++n;
 768                 }
 769         }
 770         if (!n)
 771                 return NULL;
 772
 773         path = xmalloc((n+1)*sizeof(char *));
 774         p = envpath;
 775         i = 0;
 776         do {
 777                 if (*p)
 778                         path[i++] = xstrdup(p);
 779                 p = p+strlen(p)+1;
 780         } while (i < n);
 781         path[i] = NULL;
 782
 783         free(envpath);
 784
 785         return path;
 786 }
 787
 788 static void free_path_split(char **path)
 789 {
 790         char **p = path;
 791
 792         if (!path)
 793                 return;
 794
 795         while (*p)
 796                 free(*p++);
 797         free(path);
 798 }
 799
 800 /*
 801  * exe_only means that we only want to detect .exe files, but not scripts
 802  * (which do not have an extension)
 803  */
 804 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 805 {
 806         char path[MAX_PATH];
 807         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 808
 809         if (!isexe && access(path, F_OK) == 0)
 810                 return xstrdup(path);
 811         path[strlen(path)-4] = '\0';
 812         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 813                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 814                         return xstrdup(path);
 815         return NULL;
 816 }
 817
 818 /*
 819  * Determines the absolute path of cmd using the split path in path.
 820  * If cmd contains a slash or backslash, no lookup is performed.
 821  */
 822 static char *path_lookup(const char *cmd, char **path, int exe_only)
 823 {
 824         char *prog = NULL;
 825         int len = strlen(cmd);
 826         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 827
 828         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 829                 prog = xstrdup(cmd);
 830
 831         while (!prog && *path)
 832                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 833
 834         return prog;
 835 }
 836
 837 static int env_compare(const void *a, const void *b)
 838 {
 839         char *const *ea = a;
 840         char *const *eb = b;
 841         return strcasecmp(*ea, *eb);
 842 }
 843
 844 struct pinfo_t {
 845         struct pinfo_t *next;
 846         pid_t pid;
 847         HANDLE proc;
 848 } pinfo_t;
 849 struct pinfo_t *pinfo = NULL;
 850 CRITICAL_SECTION pinfo_cs;
 851
 852 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 853                               const char *dir,
 854                               int prepend_cmd, int fhin, int fhout, int fherr)
 855 {
 856         STARTUPINFO si;
 857         PROCESS_INFORMATION pi;
 858         struct strbuf envblk, args;
 859         unsigned flags;
 860         BOOL ret;
 861
 862         /* Determine whether or not we are associated to a console */
 863         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 864                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 865                         FILE_ATTRIBUTE_NORMAL, NULL);
 866         if (cons == INVALID_HANDLE_VALUE) {
 867                 /* There is no console associated with this process.
 868                  * Since the child is a console process, Windows
 869                  * would normally create a console window. But
 870                  * since we'll be redirecting std streams, we do
 871                  * not need the console.
 872                  * It is necessary to use DETACHED_PROCESS
 873                  * instead of CREATE_NO_WINDOW to make ssh
 874                  * recognize that it has no console.
 875                  */
 876                 flags = DETACHED_PROCESS;
 877         } else {
 878                 /* There is already a console. If we specified
 879                  * DETACHED_PROCESS here, too, Windows would
 880                  * disassociate the child from the console.
 881                  * The same is true for CREATE_NO_WINDOW.
 882                  * Go figure!
 883                  */
 884                 flags = 0;
 885                 CloseHandle(cons);
 886         }
 887         memset(&si, 0, sizeof(si));
 888         si.cb = sizeof(si);
 889         si.dwFlags = STARTF_USESTDHANDLES;
 890         si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 891         si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 892         si.hStdError = (HANDLE) _get_osfhandle(fherr);
 893
 894         /* concatenate argv, quoting args as we go */
 895         strbuf_init(&args, 0);
 896         if (prepend_cmd) {
 897                 char *quoted = (char *)quote_arg(cmd);
 898                 strbuf_addstr(&args, quoted);
 899                 if (quoted != cmd)
 900                         free(quoted);
 901         }
 902         for (; *argv; argv++) {
 903                 char *quoted = (char *)quote_arg(*argv);
 904                 if (*args.buf)
 905                         strbuf_addch(&args, ' ');
 906                 strbuf_addstr(&args, quoted);
 907                 if (quoted != *argv)
 908                         free(quoted);
 909         }
 910
 911         if (env) {
 912                 int count = 0;
 913                 char **e, **sorted_env;
 914
 915                 for (e = env; *e; e++)
 916                         count++;
 917
 918                 /* environment must be sorted */
 919                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 920                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 921                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 922
 923                 strbuf_init(&envblk, 0);
 924                 for (e = sorted_env; *e; e++) {
 925                         strbuf_addstr(&envblk, *e);
 926                         strbuf_addch(&envblk, '\0');
 927                 }
 928                 free(sorted_env);
 929         }
 930
 931         memset(&pi, 0, sizeof(pi));
 932         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 933                 env ? envblk.buf : NULL, dir, &si, &pi);
 934
 935         if (env)
 936                 strbuf_release(&envblk);
 937         strbuf_release(&args);
 938
 939         if (!ret) {
 940                 errno = ENOENT;
 941                 return -1;
 942         }
 943         CloseHandle(pi.hThread);
 944
 945         /*
 946          * The process ID is the human-readable identifier of the process
 947          * that we want to present in log and error messages. The handle
 948          * is not useful for this purpose. But we cannot close it, either,
 949          * because it is not possible to turn a process ID into a process
 950          * handle after the process terminated.
 951          * Keep the handle in a list for waitpid.
 952          */
 953         EnterCriticalSection(&pinfo_cs);
 954         {
 955                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
 956                 info->pid = pi.dwProcessId;
 957                 info->proc = pi.hProcess;
 958                 info->next = pinfo;
 959                 pinfo = info;
 960         }
 961         LeaveCriticalSection(&pinfo_cs);
 962
 963         return (pid_t)pi.dwProcessId;
 964 }
 965
 966 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 967                            int prepend_cmd)
 968 {
 969         return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 970 }
 971
 972 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 973                      const char *dir,
 974                      int fhin, int fhout, int fherr)
 975 {
 976         pid_t pid;
 977         char **path = get_path_split();
 978         char *prog = path_lookup(cmd, path, 0);
 979
 980         if (!prog) {
 981                 errno = ENOENT;
 982                 pid = -1;
 983         }
 984         else {
 985                 const char *interpr = parse_interpreter(prog);
 986
 987                 if (interpr) {
 988                         const char *argv0 = argv[0];
 989                         char *iprog = path_lookup(interpr, path, 1);
 990                         argv[0] = prog;
 991                         if (!iprog) {
 992                                 errno = ENOENT;
 993                                 pid = -1;
 994                         }
 995                         else {
 996                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 997                                                        fhin, fhout, fherr);
 998                                 free(iprog);
 999                         }
1000                         argv[0] = argv0;
1001                 }
1002                 else
1003                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
1004                                                fhin, fhout, fherr);
1005                 free(prog);
1006         }
1007         free_path_split(path);
1008         return pid;
1009 }
1010
1011 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
1012 {
1013         const char *interpr = parse_interpreter(cmd);
1014         char **path;
1015         char *prog;
1016         int pid = 0;
1017
1018         if (!interpr)
1019                 return 0;
1020         path = get_path_split();
1021         prog = path_lookup(interpr, path, 1);
1022         if (prog) {
1023                 int argc = 0;
1024                 const char **argv2;
1025                 while (argv[argc]) argc++;
1026                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1027                 argv2[0] = (char *)cmd; /* full path to the script file */
1028                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1029                 pid = mingw_spawnve(prog, argv2, env, 1);
1030                 if (pid >= 0) {
1031                         int status;
1032                         if (waitpid(pid, &status, 0) < 0)
1033                                 status = 255;
1034                         exit(status);
1035                 }
1036                 pid = 1;        /* indicate that we tried but failed */
1037                 free(prog);
1038                 free(argv2);
1039         }
1040         free_path_split(path);
1041         return pid;
1042 }
1043
1044 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
1045 {
1046         /* check if git_command is a shell script */
1047         if (!try_shell_exec(cmd, argv, (char **)env)) {
1048                 int pid, status;
1049
1050                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
1051                 if (pid < 0)
1052                         return;
1053                 if (waitpid(pid, &status, 0) < 0)
1054                         status = 255;
1055                 exit(status);
1056         }
1057 }
1058
1059 void mingw_execvp(const char *cmd, char *const *argv)
1060 {
1061         char **path = get_path_split();
1062         char *prog = path_lookup(cmd, path, 0);
1063
1064         if (prog) {
1065                 mingw_execve(prog, argv, environ);
1066                 free(prog);
1067         } else
1068                 errno = ENOENT;
1069
1070         free_path_split(path);
1071 }
1072
1073 void mingw_execv(const char *cmd, char *const *argv)
1074 {
1075         mingw_execve(cmd, argv, environ);
1076 }
1077
1078 int mingw_kill(pid_t pid, int sig)
1079 {
1080         if (pid > 0 && sig == SIGTERM) {
1081                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1082
1083                 if (TerminateProcess(h, -1)) {
1084                         CloseHandle(h);
1085                         return 0;
1086                 }
1087
1088                 errno = err_win_to_posix(GetLastError());
1089                 CloseHandle(h);
1090                 return -1;
1091         }
1092
1093         errno = EINVAL;
1094         return -1;
1095 }
1096
1097 static char **copy_environ(void)
1098 {
1099         char **env;
1100         int i = 0;
1101         while (environ[i])
1102                 i++;
1103         env = xmalloc((i+1)*sizeof(*env));
1104         for (i = 0; environ[i]; i++)
1105                 env[i] = xstrdup(environ[i]);
1106         env[i] = NULL;
1107         return env;
1108 }
1109
1110 void free_environ(char **env)
1111 {
1112         int i;
1113         for (i = 0; env[i]; i++)
1114                 free(env[i]);
1115         free(env);
1116 }
1117
1118 static int lookup_env(char **env, const char *name, size_t nmln)
1119 {
1120         int i;
1121
1122         for (i = 0; env[i]; i++) {
1123                 if (0 == strncmp(env[i], name, nmln)
1124                     && '=' == env[i][nmln])
1125                         /* matches */
1126                         return i;
1127         }
1128         return -1;
1129 }
1130
1131 /*
1132  * If name contains '=', then sets the variable, otherwise it unsets it
1133  */
1134 static char **env_setenv(char **env, const char *name)
1135 {
1136         char *eq = strchrnul(name, '=');
1137         int i = lookup_env(env, name, eq-name);
1138
1139         if (i < 0) {
1140                 if (*eq) {
1141                         for (i = 0; env[i]; i++)
1142                                 ;
1143                         env = xrealloc(env, (i+2)*sizeof(*env));
1144                         env[i] = xstrdup(name);
1145                         env[i+1] = NULL;
1146                 }
1147         }
1148         else {
1149                 free(env[i]);
1150                 if (*eq)
1151                         env[i] = xstrdup(name);
1152                 else
1153                         for (; env[i]; i++)
1154                                 env[i] = env[i+1];
1155         }
1156         return env;
1157 }
1158
1159 /*
1160  * Copies global environ and adjusts variables as specified by vars.
1161  */
1162 char **make_augmented_environ(const char *const *vars)
1163 {
1164         char **env = copy_environ();
1165
1166         while (*vars)
1167                 env = env_setenv(env, *vars++);
1168         return env;
1169 }
1170
1171 /*
1172  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1173  * that service contains a numerical port, or that it it is null. It
1174  * does a simple search using gethostbyname, and returns one IPv4 host
1175  * if one was found.
1176  */
1177 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1178                                    const struct addrinfo *hints,
1179                                    struct addrinfo **res)
1180 {
1181         struct hostent *h = NULL;
1182         struct addrinfo *ai;
1183         struct sockaddr_in *sin;
1184
1185         if (node) {
1186                 h = gethostbyname(node);
1187                 if (!h)
1188                         return WSAGetLastError();
1189         }
1190
1191         ai = xmalloc(sizeof(struct addrinfo));
1192         *res = ai;
1193         ai->ai_flags = 0;
1194         ai->ai_family = AF_INET;
1195         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1196         switch (ai->ai_socktype) {
1197         case SOCK_STREAM:
1198                 ai->ai_protocol = IPPROTO_TCP;
1199                 break;
1200         case SOCK_DGRAM:
1201                 ai->ai_protocol = IPPROTO_UDP;
1202                 break;
1203         default:
1204                 ai->ai_protocol = 0;
1205                 break;
1206         }
1207         ai->ai_addrlen = sizeof(struct sockaddr_in);
1208         if (hints && (hints->ai_flags & AI_CANONNAME))
1209                 ai->ai_canonname = h ? strdup(h->h_name) : NULL;
1210         else
1211                 ai->ai_canonname = NULL;
1212
1213         sin = xmalloc(ai->ai_addrlen);
1214         memset(sin, 0, ai->ai_addrlen);
1215         sin->sin_family = AF_INET;
1216         /* Note: getaddrinfo is supposed to allow service to be a string,
1217          * which should be looked up using getservbyname. This is
1218          * currently not implemented */
1219         if (service)
1220                 sin->sin_port = htons(atoi(service));
1221         if (h)
1222                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1223         else if (hints && (hints->ai_flags & AI_PASSIVE))
1224                 sin->sin_addr.s_addr = INADDR_ANY;
1225         else
1226                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1227         ai->ai_addr = (struct sockaddr *)sin;
1228         ai->ai_next = 0;
1229         return 0;
1230 }
1231
1232 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1233 {
1234         free(res->ai_canonname);
1235         free(res->ai_addr);
1236         free(res);
1237 }
1238
1239 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1240                                    char *host, DWORD hostlen,
1241                                    char *serv, DWORD servlen, int flags)
1242 {
1243         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1244         if (sa->sa_family != AF_INET)
1245                 return EAI_FAMILY;
1246         if (!host && !serv)
1247                 return EAI_NONAME;
1248
1249         if (host && hostlen > 0) {
1250                 struct hostent *ent = NULL;
1251                 if (!(flags & NI_NUMERICHOST))
1252                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1253                                             sizeof(sin->sin_addr), AF_INET);
1254
1255                 if (ent)
1256                         snprintf(host, hostlen, "%s", ent->h_name);
1257                 else if (flags & NI_NAMEREQD)
1258                         return EAI_NONAME;
1259                 else
1260                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1261         }
1262
1263         if (serv && servlen > 0) {
1264                 struct servent *ent = NULL;
1265                 if (!(flags & NI_NUMERICSERV))
1266                         ent = getservbyport(sin->sin_port,
1267                                             flags & NI_DGRAM ? "udp" : "tcp");
1268
1269                 if (ent)
1270                         snprintf(serv, servlen, "%s", ent->s_name);
1271                 else
1272                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1273         }
1274
1275         return 0;
1276 }
1277
1278 static HMODULE ipv6_dll = NULL;
1279 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1280 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1281                                       const struct addrinfo *hints,
1282                                       struct addrinfo **res);
1283 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1284                                       char *host, DWORD hostlen,
1285                                       char *serv, DWORD servlen, int flags);
1286 /*
1287  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1288  * don't need to try to load that one dynamically.
1289  */
1290
1291 static void socket_cleanup(void)
1292 {
1293         WSACleanup();
1294         if (ipv6_dll)
1295                 FreeLibrary(ipv6_dll);
1296         ipv6_dll = NULL;
1297         ipv6_freeaddrinfo = freeaddrinfo_stub;
1298         ipv6_getaddrinfo = getaddrinfo_stub;
1299         ipv6_getnameinfo = getnameinfo_stub;
1300 }
1301
1302 static void ensure_socket_initialization(void)
1303 {
1304         WSADATA wsa;
1305         static int initialized = 0;
1306         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1307         const char **name;
1308
1309         if (initialized)
1310                 return;
1311
1312         if (WSAStartup(MAKEWORD(2,2), &wsa))
1313                 die("unable to initialize winsock subsystem, error %d",
1314                         WSAGetLastError());
1315
1316         for (name = libraries; *name; name++) {
1317                 ipv6_dll = LoadLibrary(*name);
1318                 if (!ipv6_dll)
1319                         continue;
1320
1321                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1322                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1323                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1324                                                    const struct addrinfo *,
1325                                                    struct addrinfo **))
1326                         GetProcAddress(ipv6_dll, "getaddrinfo");
1327                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1328                                                    socklen_t, char *, DWORD,
1329                                                    char *, DWORD, int))
1330                         GetProcAddress(ipv6_dll, "getnameinfo");
1331                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1332                         FreeLibrary(ipv6_dll);
1333                         ipv6_dll = NULL;
1334                 } else
1335                         break;
1336         }
1337         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1338                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1339                 ipv6_getaddrinfo = getaddrinfo_stub;
1340                 ipv6_getnameinfo = getnameinfo_stub;
1341         }
1342
1343         atexit(socket_cleanup);
1344         initialized = 1;
1345 }
1346
1347 #undef gethostbyname
1348 struct hostent *mingw_gethostbyname(const char *host)
1349 {
1350         ensure_socket_initialization();
1351         return gethostbyname(host);
1352 }
1353
1354 void mingw_freeaddrinfo(struct addrinfo *res)
1355 {
1356         ipv6_freeaddrinfo(res);
1357 }
1358
1359 int mingw_getaddrinfo(const char *node, const char *service,
1360                       const struct addrinfo *hints, struct addrinfo **res)
1361 {
1362         ensure_socket_initialization();
1363         return ipv6_getaddrinfo(node, service, hints, res);
1364 }
1365
1366 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1367                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1368                       int flags)
1369 {
1370         ensure_socket_initialization();
1371         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1372 }
1373
1374 int mingw_socket(int domain, int type, int protocol)
1375 {
1376         int sockfd;
1377         SOCKET s;
1378
1379         ensure_socket_initialization();
1380         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1381         if (s == INVALID_SOCKET) {
1382                 /*
1383                  * WSAGetLastError() values are regular BSD error codes
1384                  * biased by WSABASEERR.
1385                  * However, strerror() does not know about networking
1386                  * specific errors, which are values beginning at 38 or so.
1387                  * Therefore, we choose to leave the biased error code
1388                  * in errno so that _if_ someone looks up the code somewhere,
1389                  * then it is at least the number that are usually listed.
1390                  */
1391                 errno = WSAGetLastError();
1392                 return -1;
1393         }
1394         /* convert into a file descriptor */
1395         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1396                 closesocket(s);
1397                 return error("unable to make a socket file descriptor: %s",
1398                         strerror(errno));
1399         }
1400         return sockfd;
1401 }
1402
1403 #undef connect
1404 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1405 {
1406         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1407         return connect(s, sa, sz);
1408 }
1409
1410 #undef bind
1411 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1412 {
1413         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1414         return bind(s, sa, sz);
1415 }
1416
1417 #undef setsockopt
1418 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1419 {
1420         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1421         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1422 }
1423
1424 #undef listen
1425 int mingw_listen(int sockfd, int backlog)
1426 {
1427         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1428         return listen(s, backlog);
1429 }
1430
1431 #undef accept
1432 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1433 {
1434         int sockfd2;
1435
1436         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1437         SOCKET s2 = accept(s1, sa, sz);
1438
1439         /* convert into a file descriptor */
1440         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1441                 int err = errno;
1442                 closesocket(s2);
1443                 return error("unable to make a socket file descriptor: %s",
1444                         strerror(err));
1445         }
1446         return sockfd2;
1447 }
1448
1449 #undef rename
1450 int mingw_rename(const char *pold, const char *pnew)
1451 {
1452         DWORD attrs, gle;
1453         int tries = 0;
1454
1455         /*
1456          * Try native rename() first to get errno right.
1457          * It is based on MoveFile(), which cannot overwrite existing files.
1458          */
1459         if (!rename(pold, pnew))
1460                 return 0;
1461         if (errno != EEXIST)
1462                 return -1;
1463 repeat:
1464         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1465                 return 0;
1466         /* TODO: translate more errors */
1467         gle = GetLastError();
1468         if (gle == ERROR_ACCESS_DENIED &&
1469             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1470                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1471                         errno = EISDIR;
1472                         return -1;
1473                 }
1474                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1475                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1476                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1477                                 return 0;
1478                         gle = GetLastError();
1479                         /* revert file attributes on failure */
1480                         SetFileAttributes(pnew, attrs);
1481                 }
1482         }
1483         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1484                 /*
1485                  * We assume that some other process had the source or
1486                  * destination file open at the wrong moment and retry.
1487                  * In order to give the other process a higher chance to
1488                  * complete its operation, we give up our time slice now.
1489                  * If we have to retry again, we do sleep a bit.
1490                  */
1491                 Sleep(delay[tries]);
1492                 tries++;
1493                 goto repeat;
1494         }
1495         if (gle == ERROR_ACCESS_DENIED &&
1496                ask_user_yes_no("Rename from '%s' to '%s' failed. "
1497                        "Should I try again?", pold, pnew))
1498                 goto repeat;
1499
1500         errno = EACCES;
1501         return -1;
1502 }
1503
1504 /*
1505  * Note that this doesn't return the actual pagesize, but
1506  * the allocation granularity. If future Windows specific git code
1507  * needs the real getpagesize function, we need to find another solution.
1508  */
1509 int mingw_getpagesize(void)
1510 {
1511         SYSTEM_INFO si;
1512         GetSystemInfo(&si);
1513         return si.dwAllocationGranularity;
1514 }
1515
1516 struct passwd *getpwuid(int uid)
1517 {
1518         static char user_name[100];
1519         static struct passwd p;
1520
1521         DWORD len = sizeof(user_name);
1522         if (!GetUserName(user_name, &len))
1523                 return NULL;
1524         p.pw_name = user_name;
1525         p.pw_gecos = "unknown";
1526         p.pw_dir = NULL;
1527         return &p;
1528 }
1529
1530 static HANDLE timer_event;
1531 static HANDLE timer_thread;
1532 static int timer_interval;
1533 static int one_shot;
1534 static sig_handler_t timer_fn = SIG_DFL;
1535
1536 /* The timer works like this:
1537  * The thread, ticktack(), is a trivial routine that most of the time
1538  * only waits to receive the signal to terminate. The main thread tells
1539  * the thread to terminate by setting the timer_event to the signalled
1540  * state.
1541  * But ticktack() interrupts the wait state after the timer's interval
1542  * length to call the signal handler.
1543  */
1544
1545 static unsigned __stdcall ticktack(void *dummy)
1546 {
1547         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1548                 if (timer_fn == SIG_DFL)
1549                         die("Alarm");
1550                 if (timer_fn != SIG_IGN)
1551                         timer_fn(SIGALRM);
1552                 if (one_shot)
1553                         break;
1554         }
1555         return 0;
1556 }
1557
1558 static int start_timer_thread(void)
1559 {
1560         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1561         if (timer_event) {
1562                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1563                 if (!timer_thread )
1564                         return errno = ENOMEM,
1565                                 error("cannot start timer thread");
1566         } else
1567                 return errno = ENOMEM,
1568                         error("cannot allocate resources for timer");
1569         return 0;
1570 }
1571
1572 static void stop_timer_thread(void)
1573 {
1574         if (timer_event)
1575                 SetEvent(timer_event);  /* tell thread to terminate */
1576         if (timer_thread) {
1577                 int rc = WaitForSingleObject(timer_thread, 1000);
1578                 if (rc == WAIT_TIMEOUT)
1579                         error("timer thread did not terminate timely");
1580                 else if (rc != WAIT_OBJECT_0)
1581                         error("waiting for timer thread failed: %lu",
1582                               GetLastError());
1583                 CloseHandle(timer_thread);
1584         }
1585         if (timer_event)
1586                 CloseHandle(timer_event);
1587         timer_event = NULL;
1588         timer_thread = NULL;
1589 }
1590
1591 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1592 {
1593         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1594 }
1595
1596 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1597 {
1598         static const struct timeval zero;
1599         static int atexit_done;
1600
1601         if (out != NULL)
1602                 return errno = EINVAL,
1603                         error("setitimer param 3 != NULL not implemented");
1604         if (!is_timeval_eq(&in->it_interval, &zero) &&
1605             !is_timeval_eq(&in->it_interval, &in->it_value))
1606                 return errno = EINVAL,
1607                         error("setitimer: it_interval must be zero or eq it_value");
1608
1609         if (timer_thread)
1610                 stop_timer_thread();
1611
1612         if (is_timeval_eq(&in->it_value, &zero) &&
1613             is_timeval_eq(&in->it_interval, &zero))
1614                 return 0;
1615
1616         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1617         one_shot = is_timeval_eq(&in->it_interval, &zero);
1618         if (!atexit_done) {
1619                 atexit(stop_timer_thread);
1620                 atexit_done = 1;
1621         }
1622         return start_timer_thread();
1623 }
1624
1625 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1626 {
1627         if (sig != SIGALRM)
1628                 return errno = EINVAL,
1629                         error("sigaction only implemented for SIGALRM");
1630         if (out != NULL)
1631                 return errno = EINVAL,
1632                         error("sigaction: param 3 != NULL not implemented");
1633
1634         timer_fn = in->sa_handler;
1635         return 0;
1636 }
1637
1638 #undef signal
1639 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1640 {
1641         sig_handler_t old = timer_fn;
1642         if (sig != SIGALRM)
1643                 return signal(sig, handler);
1644         timer_fn = handler;
1645         return old;
1646 }
1647
1648 static const char *make_backslash_path(const char *path)
1649 {
1650         static char buf[PATH_MAX + 1];
1651         char *c;
1652
1653         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1654                 die("Too long path: %.*s", 60, path);
1655
1656         for (c = buf; *c; c++) {
1657                 if (*c == '/')
1658                         *c = '\\';
1659         }
1660         return buf;
1661 }
1662
1663 void mingw_open_html(const char *unixpath)
1664 {
1665         const char *htmlpath = make_backslash_path(unixpath);
1666         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1667                         const char *, const char *, const char *, INT);
1668         T ShellExecute;
1669         HMODULE shell32;
1670         int r;
1671
1672         shell32 = LoadLibrary("shell32.dll");
1673         if (!shell32)
1674                 die("cannot load shell32.dll");
1675         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1676         if (!ShellExecute)
1677                 die("cannot run browser");
1678
1679         printf("Launching default browser to display HTML ...\n");
1680         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1681         FreeLibrary(shell32);
1682         /* see the MSDN documentation referring to the result codes here */
1683         if (r <= 32) {
1684                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1685         }
1686 }
1687
1688 int link(const char *oldpath, const char *newpath)
1689 {
1690         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1691         static T create_hard_link = NULL;
1692         if (!create_hard_link) {
1693                 create_hard_link = (T) GetProcAddress(
1694                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1695                 if (!create_hard_link)
1696                         create_hard_link = (T)-1;
1697         }
1698         if (create_hard_link == (T)-1) {
1699                 errno = ENOSYS;
1700                 return -1;
1701         }
1702         if (!create_hard_link(newpath, oldpath, NULL)) {
1703                 errno = err_win_to_posix(GetLastError());
1704                 return -1;
1705         }
1706         return 0;
1707 }
1708
1709 char *getpass(const char *prompt)
1710 {
1711         struct strbuf buf = STRBUF_INIT;
1712
1713         fputs(prompt, stderr);
1714         for (;;) {
1715                 char c = _getch();
1716                 if (c == '\r' || c == '\n')
1717                         break;
1718                 strbuf_addch(&buf, c);
1719         }
1720         fputs("\n", stderr);
1721         return strbuf_detach(&buf, NULL);
1722 }
1723
1724 pid_t waitpid(pid_t pid, int *status, unsigned options)
1725 {
1726         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1727             FALSE, pid);
1728         if (!h) {
1729                 errno = ECHILD;
1730                 return -1;
1731         }
1732
1733         if (pid > 0 && options & WNOHANG) {
1734                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1735                         CloseHandle(h);
1736                         return 0;
1737                 }
1738                 options &= ~WNOHANG;
1739         }
1740
1741         if (options == 0) {
1742                 struct pinfo_t **ppinfo;
1743                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1744                         CloseHandle(h);
1745                         return 0;
1746                 }
1747
1748                 if (status)
1749                         GetExitCodeProcess(h, (LPDWORD)status);
1750
1751                 EnterCriticalSection(&pinfo_cs);
1752
1753                 ppinfo = &pinfo;
1754                 while (*ppinfo) {
1755                         struct pinfo_t *info = *ppinfo;
1756                         if (info->pid == pid) {
1757                                 CloseHandle(info->proc);
1758                                 *ppinfo = info->next;
1759                                 free(info);
1760                                 break;
1761                         }
1762                         ppinfo = &info->next;
1763                 }
1764
1765                 LeaveCriticalSection(&pinfo_cs);
1766
1767                 CloseHandle(h);
1768                 return pid;
1769         }
1770         CloseHandle(h);
1771
1772         errno = EINVAL;
1773         return -1;
1774 }
1775
1776 const char *get_windows_home_directory(void)
1777 {
1778         static const char *home_directory = NULL;
1779         struct strbuf buf = STRBUF_INIT;
1780
1781         if (home_directory)
1782                 return home_directory;
1783
1784         home_directory = getenv("HOME");
1785         if (home_directory && *home_directory)
1786                 return home_directory;
1787
1788         strbuf_addf(&buf, "%s/%s", getenv("HOMEDRIVE"), getenv("HOMEPATH"));
1789         home_directory = strbuf_detach(&buf, NULL);
1790
1791         return home_directory;
1792 }
1793
1794 int mingw_offset_1st_component(const char *path)
1795 {
1796         int offset = 0;
1797         if (has_dos_drive_prefix(path))
1798                 offset = 2;
1799
1800         /* unc paths */
1801         else if (is_dir_sep(path[0]) && is_dir_sep(path[1])) {
1802
1803                 /* skip server name */
1804                 char *pos = strpbrk(path + 2, "\\/");
1805                 if (!pos)
1806                         return 0; /* Error: malformed unc path */
1807
1808                 do {
1809                         pos++;
1810                 } while (*pos && !is_dir_sep(*pos));
1811
1812                 offset = pos - path;
1813         }
1814
1815         return offset + is_dir_sep(path[offset]);
1816 }