compat/mingw.c

   1 #include "../git-compat-util.h"
   2 #include "win32.h"
   3 #include <conio.h>
   4 #include "../strbuf.h"
   5 #include "../run-command.h"
   6 #include "../cache.h"
   7
   8 static const int delay[] = { 0, 1, 10, 20, 40 };
   9 unsigned int _CRT_fmode = _O_BINARY;
  10
  11 int err_win_to_posix(DWORD winerr)
  12 {
  13         int error = ENOSYS;
  14         switch(winerr) {
  15         case ERROR_ACCESS_DENIED: error = EACCES; break;
  16         case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  17         case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  18         case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  19         case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  20         case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  21         case ERROR_BAD_COMMAND: error = EIO; break;
  22         case ERROR_BAD_DEVICE: error = ENODEV; break;
  23         case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  24         case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  25         case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  26         case ERROR_BAD_LENGTH: error = EINVAL; break;
  27         case ERROR_BAD_PATHNAME: error = ENOENT; break;
  28         case ERROR_BAD_PIPE: error = EPIPE; break;
  29         case ERROR_BAD_UNIT: error = ENODEV; break;
  30         case ERROR_BAD_USERNAME: error = EINVAL; break;
  31         case ERROR_BROKEN_PIPE: error = EPIPE; break;
  32         case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  33         case ERROR_BUSY: error = EBUSY; break;
  34         case ERROR_BUSY_DRIVE: error = EBUSY; break;
  35         case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  36         case ERROR_CANNOT_MAKE: error = EACCES; break;
  37         case ERROR_CANTOPEN: error = EIO; break;
  38         case ERROR_CANTREAD: error = EIO; break;
  39         case ERROR_CANTWRITE: error = EIO; break;
  40         case ERROR_CRC: error = EIO; break;
  41         case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  42         case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  43         case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  44         case ERROR_DIRECTORY: error = EINVAL; break;
  45         case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  46         case ERROR_DISK_CHANGE: error = EIO; break;
  47         case ERROR_DISK_FULL: error = ENOSPC; break;
  48         case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  49         case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  50         case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  51         case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  52         case ERROR_FILE_EXISTS: error = EEXIST; break;
  53         case ERROR_FILE_INVALID: error = ENODEV; break;
  54         case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  55         case ERROR_GEN_FAILURE: error = EIO; break;
  56         case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  57         case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  58         case ERROR_INVALID_ACCESS: error = EACCES; break;
  59         case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  60         case ERROR_INVALID_BLOCK: error = EFAULT; break;
  61         case ERROR_INVALID_DATA: error = EINVAL; break;
  62         case ERROR_INVALID_DRIVE: error = ENODEV; break;
  63         case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  64         case ERROR_INVALID_FLAGS: error = EINVAL; break;
  65         case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  66         case ERROR_INVALID_HANDLE: error = EBADF; break;
  67         case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  68         case ERROR_INVALID_NAME: error = EINVAL; break;
  69         case ERROR_INVALID_OWNER: error = EINVAL; break;
  70         case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  71         case ERROR_INVALID_PASSWORD: error = EPERM; break;
  72         case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  73         case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  74         case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  75         case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  76         case ERROR_IO_DEVICE: error = EIO; break;
  77         case ERROR_IO_INCOMPLETE: error = EINTR; break;
  78         case ERROR_LOCKED: error = EBUSY; break;
  79         case ERROR_LOCK_VIOLATION: error = EACCES; break;
  80         case ERROR_LOGON_FAILURE: error = EACCES; break;
  81         case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  82         case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  83         case ERROR_MORE_DATA: error = EPIPE; break;
  84         case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  85         case ERROR_NOACCESS: error = EFAULT; break;
  86         case ERROR_NONE_MAPPED: error = EINVAL; break;
  87         case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  88         case ERROR_NOT_READY: error = EAGAIN; break;
  89         case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  90         case ERROR_NO_DATA: error = EPIPE; break;
  91         case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  92         case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  93         case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  94         case ERROR_OPEN_FAILED: error = EIO; break;
  95         case ERROR_OPEN_FILES: error = EBUSY; break;
  96         case ERROR_OPERATION_ABORTED: error = EINTR; break;
  97         case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  98         case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
  99         case ERROR_PATH_BUSY: error = EBUSY; break;
 100         case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
 101         case ERROR_PIPE_BUSY: error = EBUSY; break;
 102         case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 103         case ERROR_PIPE_LISTENING: error = EPIPE; break;
 104         case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 105         case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 106         case ERROR_READ_FAULT: error = EIO; break;
 107         case ERROR_SEEK: error = EIO; break;
 108         case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 109         case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 110         case ERROR_SHARING_VIOLATION: error = EACCES; break;
 111         case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 112         case ERROR_SWAPERROR: error = ENOENT; break;
 113         case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 114         case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 115         case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 116         case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 117         case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 118         case ERROR_WRITE_FAULT: error = EIO; break;
 119         case ERROR_WRITE_PROTECT: error = EROFS; break;
 120         }
 121         return error;
 122 }
 123
 124 static inline int is_file_in_use_error(DWORD errcode)
 125 {
 126         switch (errcode) {
 127         case ERROR_SHARING_VIOLATION:
 128         case ERROR_ACCESS_DENIED:
 129                 return 1;
 130         }
 131
 132         return 0;
 133 }
 134
 135 static int read_yes_no_answer(void)
 136 {
 137         char answer[1024];
 138
 139         if (fgets(answer, sizeof(answer), stdin)) {
 140                 size_t answer_len = strlen(answer);
 141                 int got_full_line = 0, c;
 142
 143                 /* remove the newline */
 144                 if (answer_len >= 2 && answer[answer_len-2] == '\r') {
 145                         answer[answer_len-2] = '\0';
 146                         got_full_line = 1;
 147                 } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
 148                         answer[answer_len-1] = '\0';
 149                         got_full_line = 1;
 150                 }
 151                 /* flush the buffer in case we did not get the full line */
 152                 if (!got_full_line)
 153                         while ((c = getchar()) != EOF && c != '\n')
 154                                 ;
 155         } else
 156                 /* we could not read, return the
 157                  * default answer which is no */
 158                 return 0;
 159
 160         if (tolower(answer[0]) == 'y' && !answer[1])
 161                 return 1;
 162         if (!strncasecmp(answer, "yes", sizeof(answer)))
 163                 return 1;
 164         if (tolower(answer[0]) == 'n' && !answer[1])
 165                 return 0;
 166         if (!strncasecmp(answer, "no", sizeof(answer)))
 167                 return 0;
 168
 169         /* did not find an answer we understand */
 170         return -1;
 171 }
 172
 173 static int ask_yes_no_if_possible(const char *format, ...)
 174 {
 175         char question[4096];
 176         const char *retry_hook[] = { NULL, NULL, NULL };
 177         va_list args;
 178
 179         va_start(args, format);
 180         vsnprintf(question, sizeof(question), format, args);
 181         va_end(args);
 182
 183         if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) {
 184                 retry_hook[1] = question;
 185                 return !run_command_v_opt(retry_hook, 0);
 186         }
 187
 188         if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
 189                 return 0;
 190
 191         while (1) {
 192                 int answer;
 193                 fprintf(stderr, "%s (y/n) ", question);
 194
 195                 if ((answer = read_yes_no_answer()) >= 0)
 196                         return answer;
 197
 198                 fprintf(stderr, "Sorry, I did not understand your answer. "
 199                                 "Please type 'y' or 'n'\n");
 200         }
 201 }
 202
 203 #undef unlink
 204 int mingw_unlink(const char *pathname)
 205 {
 206         int ret, tries = 0;
 207
 208         /* read-only files cannot be removed */
 209         chmod(pathname, 0666);
 210         while ((ret = unlink(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 211                 if (!is_file_in_use_error(GetLastError()))
 212                         break;
 213                 /*
 214                  * We assume that some other process had the source or
 215                  * destination file open at the wrong moment and retry.
 216                  * In order to give the other process a higher chance to
 217                  * complete its operation, we give up our time slice now.
 218                  * If we have to retry again, we do sleep a bit.
 219                  */
 220                 Sleep(delay[tries]);
 221                 tries++;
 222         }
 223         while (ret == -1 && is_file_in_use_error(GetLastError()) &&
 224                ask_yes_no_if_possible("Unlink of file '%s' failed. "
 225                         "Should I try again?", pathname))
 226                ret = unlink(pathname);
 227         return ret;
 228 }
 229
 230 static int is_dir_empty(const char *path)
 231 {
 232         struct strbuf buf = STRBUF_INIT;
 233         WIN32_FIND_DATAA findbuf;
 234         HANDLE handle;
 235
 236         strbuf_addf(&buf, "%s\\*", path);
 237         handle = FindFirstFileA(buf.buf, &findbuf);
 238         if (handle == INVALID_HANDLE_VALUE) {
 239                 strbuf_release(&buf);
 240                 return GetLastError() == ERROR_NO_MORE_FILES;
 241         }
 242
 243         while (!strcmp(findbuf.cFileName, ".") ||
 244                         !strcmp(findbuf.cFileName, ".."))
 245                 if (!FindNextFile(handle, &findbuf)) {
 246                         strbuf_release(&buf);
 247                         return GetLastError() == ERROR_NO_MORE_FILES;
 248                 }
 249         FindClose(handle);
 250         strbuf_release(&buf);
 251         return 0;
 252 }
 253
 254 #undef rmdir
 255 int mingw_rmdir(const char *pathname)
 256 {
 257         int ret, tries = 0;
 258
 259         while ((ret = rmdir(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 260                 if (!is_file_in_use_error(GetLastError()))
 261                         break;
 262                 if (!is_dir_empty(pathname)) {
 263                         errno = ENOTEMPTY;
 264                         break;
 265                 }
 266                 /*
 267                  * We assume that some other process had the source or
 268                  * destination file open at the wrong moment and retry.
 269                  * In order to give the other process a higher chance to
 270                  * complete its operation, we give up our time slice now.
 271                  * If we have to retry again, we do sleep a bit.
 272                  */
 273                 Sleep(delay[tries]);
 274                 tries++;
 275         }
 276         while (ret == -1 && is_file_in_use_error(GetLastError()) &&
 277                ask_yes_no_if_possible("Deletion of directory '%s' failed. "
 278                         "Should I try again?", pathname))
 279                ret = rmdir(pathname);
 280         return ret;
 281 }
 282
 283 static int make_hidden(const char *path)
 284 {
 285         DWORD attribs = GetFileAttributes(path);
 286         if (SetFileAttributes(path, FILE_ATTRIBUTE_HIDDEN | attribs))
 287                 return 0;
 288         errno = err_win_to_posix(GetLastError());
 289         return -1;
 290 }
 291
 292 void mingw_mark_as_git_dir(const char *dir)
 293 {
 294         if (hide_dotfiles != HIDE_DOTFILES_FALSE && !is_bare_repository() &&
 295             make_hidden(dir))
 296                 warning("Failed to make '%s' hidden", dir);
 297         git_config_set("core.hideDotFiles",
 298                 hide_dotfiles == HIDE_DOTFILES_FALSE ? "false" :
 299                 (hide_dotfiles == HIDE_DOTFILES_DOTGITONLY ?
 300                  "dotGitOnly" : "true"));
 301 }
 302
 303 #undef mkdir
 304 int mingw_mkdir(const char *path, int mode)
 305 {
 306         int ret = mkdir(path);
 307         if (!ret && hide_dotfiles == HIDE_DOTFILES_TRUE) {
 308                 /*
 309                  * In Windows a file or dir starting with a dot is not
 310                  * automatically hidden. So lets mark it as hidden when
 311                  * such a directory is created.
 312                  */
 313                 const char *start = basename((char*)path);
 314                 if (*start == '.')
 315                         return make_hidden(path);
 316         }
 317         return ret;
 318 }
 319
 320 #undef open
 321 int mingw_open (const char *filename, int oflags, ...)
 322 {
 323         va_list args;
 324         unsigned mode;
 325         int fd;
 326
 327         va_start(args, oflags);
 328         mode = va_arg(args, int);
 329         va_end(args);
 330
 331         if (filename && !strcmp(filename, "/dev/null"))
 332                 filename = "nul";
 333
 334         fd = open(filename, oflags, mode);
 335
 336         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 337                 DWORD attrs = GetFileAttributes(filename);
 338                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 339                         errno = EISDIR;
 340         }
 341         if ((oflags & O_CREAT) && fd >= 0 &&
 342             hide_dotfiles == HIDE_DOTFILES_TRUE) {
 343                 /*
 344                  * In Windows a file or dir starting with a dot is not
 345                  * automatically hidden. So lets mark it as hidden when
 346                  * such a file is created.
 347                  */
 348                 const char *start = basename((char*)filename);
 349                 if (*start == '.' && make_hidden(filename))
 350                         warning("Could not mark '%s' as hidden.", filename);
 351         }
 352         return fd;
 353 }
 354
 355 #undef write
 356 ssize_t mingw_write(int fd, const void *buf, size_t count)
 357 {
 358         /*
 359          * While write() calls to a file on a local disk are translated
 360          * into WriteFile() calls with a maximum size of 64KB on Windows
 361          * XP and 256KB on Vista, no such cap is placed on writes to
 362          * files over the network on Windows XP.  Unfortunately, there
 363          * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 364          * bigger writes fail on Windows XP.
 365          * So we cap to a nice 31MB here to avoid write failures over
 366          * the net without changing the number of WriteFile() calls in
 367          * the local case.
 368          */
 369         return write(fd, buf, min(count, 31 * 1024 * 1024));
 370 }
 371
 372 #undef fopen
 373 FILE *mingw_fopen (const char *filename, const char *otype)
 374 {
 375         int hide = 0;
 376         FILE *file;
 377         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 378             basename((char*)filename)[0] == '.')
 379                 hide = access(filename, F_OK);
 380         if (filename && !strcmp(filename, "/dev/null"))
 381                 filename = "nul";
 382         file = fopen(filename, otype);
 383         if (file && hide && make_hidden(filename))
 384                 warning("Could not mark '%s' as hidden.", filename);
 385         return file;
 386 }
 387
 388 #undef freopen
 389 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 390 {
 391         int hide = 0;
 392         FILE *file;
 393         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 394             basename((char*)filename)[0] == '.')
 395                 hide = access(filename, F_OK);
 396         if (filename && !strcmp(filename, "/dev/null"))
 397                 filename = "nul";
 398         file = freopen(filename, otype, stream);
 399         if (file && hide && make_hidden(filename))
 400                 warning("Could not mark '%s' as hidden.", filename);
 401         return file;
 402 }
 403
 404 /*
 405  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 406  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 407  */
 408 static inline long long filetime_to_hnsec(const FILETIME *ft)
 409 {
 410         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 411         /* Windows to Unix Epoch conversion */
 412         return winTime - 116444736000000000LL;
 413 }
 414
 415 static inline time_t filetime_to_time_t(const FILETIME *ft)
 416 {
 417         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 418 }
 419
 420 /* We keep the do_lstat code in a separate function to avoid recursion.
 421  * When a path ends with a slash, the stat will fail with ENOENT. In
 422  * this case, we strip the trailing slashes and stat again.
 423  *
 424  * If follow is true then act like stat() and report on the link
 425  * target. Otherwise report on the link itself.
 426  */
 427 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 428 {
 429         int err;
 430         WIN32_FILE_ATTRIBUTE_DATA fdata;
 431
 432         if (!(err = get_file_attr(file_name, &fdata))) {
 433                 buf->st_ino = 0;
 434                 buf->st_gid = 0;
 435                 buf->st_uid = 0;
 436                 buf->st_nlink = 1;
 437                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 438                 buf->st_size = fdata.nFileSizeLow |
 439                         (((off_t)fdata.nFileSizeHigh)<<32);
 440                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 441                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 442                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 443                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 444                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 445                         WIN32_FIND_DATAA findbuf;
 446                         HANDLE handle = FindFirstFileA(file_name, &findbuf);
 447                         if (handle != INVALID_HANDLE_VALUE) {
 448                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 449                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 450                                         if (follow) {
 451                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 452                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 453                                         } else {
 454                                                 buf->st_mode = S_IFLNK;
 455                                         }
 456                                         buf->st_mode |= S_IREAD;
 457                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 458                                                 buf->st_mode |= S_IWRITE;
 459                                 }
 460                                 FindClose(handle);
 461                         }
 462                 }
 463                 return 0;
 464         }
 465         errno = err;
 466         return -1;
 467 }
 468
 469 /* We provide our own lstat/fstat functions, since the provided
 470  * lstat/fstat functions are so slow. These stat functions are
 471  * tailored for Git's usage (read: fast), and are not meant to be
 472  * complete. Note that Git stat()s are redirected to mingw_lstat()
 473  * too, since Windows doesn't really handle symlinks that well.
 474  */
 475 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 476 {
 477         int namelen;
 478         char alt_name[PATH_MAX];
 479
 480         if (!do_lstat(follow, file_name, buf))
 481                 return 0;
 482
 483         /* if file_name ended in a '/', Windows returned ENOENT;
 484          * try again without trailing slashes
 485          */
 486         if (errno != ENOENT)
 487                 return -1;
 488
 489         namelen = strlen(file_name);
 490         if (namelen && file_name[namelen-1] != '/')
 491                 return -1;
 492         while (namelen && file_name[namelen-1] == '/')
 493                 --namelen;
 494         if (!namelen || namelen >= PATH_MAX)
 495                 return -1;
 496
 497         memcpy(alt_name, file_name, namelen);
 498         alt_name[namelen] = 0;
 499         return do_lstat(follow, alt_name, buf);
 500 }
 501
 502 int mingw_lstat(const char *file_name, struct stat *buf)
 503 {
 504         return do_stat_internal(0, file_name, buf);
 505 }
 506 int mingw_stat(const char *file_name, struct stat *buf)
 507 {
 508         return do_stat_internal(1, file_name, buf);
 509 }
 510
 511 #undef fstat
 512 int mingw_fstat(int fd, struct stat *buf)
 513 {
 514         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 515         BY_HANDLE_FILE_INFORMATION fdata;
 516
 517         if (fh == INVALID_HANDLE_VALUE) {
 518                 errno = EBADF;
 519                 return -1;
 520         }
 521         /* direct non-file handles to MS's fstat() */
 522         if (GetFileType(fh) != FILE_TYPE_DISK)
 523                 return _fstati64(fd, buf);
 524
 525         if (GetFileInformationByHandle(fh, &fdata)) {
 526                 buf->st_ino = 0;
 527                 buf->st_gid = 0;
 528                 buf->st_uid = 0;
 529                 buf->st_nlink = 1;
 530                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 531                 buf->st_size = fdata.nFileSizeLow |
 532                         (((off_t)fdata.nFileSizeHigh)<<32);
 533                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 534                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 535                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 536                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 537                 return 0;
 538         }
 539         errno = EBADF;
 540         return -1;
 541 }
 542
 543 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 544 {
 545         long long winTime = t * 10000000LL + 116444736000000000LL;
 546         ft->dwLowDateTime = winTime;
 547         ft->dwHighDateTime = winTime >> 32;
 548 }
 549
 550 int mingw_utime (const char *file_name, const struct utimbuf *times)
 551 {
 552         FILETIME mft, aft;
 553         int fh, rc;
 554
 555         /* must have write permission */
 556         DWORD attrs = GetFileAttributes(file_name);
 557         if (attrs != INVALID_FILE_ATTRIBUTES &&
 558             (attrs & FILE_ATTRIBUTE_READONLY)) {
 559                 /* ignore errors here; open() will report them */
 560                 SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 561         }
 562
 563         if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 564                 rc = -1;
 565                 goto revert_attrs;
 566         }
 567
 568         if (times) {
 569                 time_t_to_filetime(times->modtime, &mft);
 570                 time_t_to_filetime(times->actime, &aft);
 571         } else {
 572                 GetSystemTimeAsFileTime(&mft);
 573                 aft = mft;
 574         }
 575         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 576                 errno = EINVAL;
 577                 rc = -1;
 578         } else
 579                 rc = 0;
 580         close(fh);
 581
 582 revert_attrs:
 583         if (attrs != INVALID_FILE_ATTRIBUTES &&
 584             (attrs & FILE_ATTRIBUTE_READONLY)) {
 585                 /* ignore errors again */
 586                 SetFileAttributes(file_name, attrs);
 587         }
 588         return rc;
 589 }
 590
 591 unsigned int sleep (unsigned int seconds)
 592 {
 593         Sleep(seconds*1000);
 594         return 0;
 595 }
 596
 597 int mkstemp(char *template)
 598 {
 599         char *filename = mktemp(template);
 600         if (filename == NULL)
 601                 return -1;
 602         return open(filename, O_RDWR | O_CREAT, 0600);
 603 }
 604
 605 int gettimeofday(struct timeval *tv, void *tz)
 606 {
 607         FILETIME ft;
 608         long long hnsec;
 609
 610         GetSystemTimeAsFileTime(&ft);
 611         hnsec = filetime_to_hnsec(&ft);
 612         tv->tv_sec = hnsec / 10000000;
 613         tv->tv_usec = (hnsec % 10000000) / 10;
 614         return 0;
 615 }
 616
 617 int pipe(int filedes[2])
 618 {
 619         HANDLE h[2];
 620
 621         /* this creates non-inheritable handles */
 622         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 623                 errno = err_win_to_posix(GetLastError());
 624                 return -1;
 625         }
 626         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 627         if (filedes[0] < 0) {
 628                 CloseHandle(h[0]);
 629                 CloseHandle(h[1]);
 630                 return -1;
 631         }
 632         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 633         if (filedes[0] < 0) {
 634                 close(filedes[0]);
 635                 CloseHandle(h[1]);
 636                 return -1;
 637         }
 638         return 0;
 639 }
 640
 641 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 642 {
 643         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 644         memcpy(result, gmtime(timep), sizeof(struct tm));
 645         return result;
 646 }
 647
 648 struct tm *localtime_r(const time_t *timep, struct tm *result)
 649 {
 650         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 651         memcpy(result, localtime(timep), sizeof(struct tm));
 652         return result;
 653 }
 654
 655 #undef getcwd
 656 char *mingw_getcwd(char *pointer, int len)
 657 {
 658         int i;
 659         char *ret = getcwd(pointer, len);
 660         if (!ret)
 661                 return ret;
 662         for (i = 0; pointer[i]; i++)
 663                 if (pointer[i] == '\\')
 664                         pointer[i] = '/';
 665         return ret;
 666 }
 667
 668 /*
 669  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 670  * (Parsing C++ Command-Line Arguments)
 671  */
 672 static const char *quote_arg(const char *arg)
 673 {
 674         /* count chars to quote */
 675         int len = 0, n = 0;
 676         int force_quotes = 0;
 677         char *q, *d;
 678         const char *p = arg;
 679         if (!*p) force_quotes = 1;
 680         while (*p) {
 681                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 682                         force_quotes = 1;
 683                 else if (*p == '"')
 684                         n++;
 685                 else if (*p == '\\') {
 686                         int count = 0;
 687                         while (*p == '\\') {
 688                                 count++;
 689                                 p++;
 690                                 len++;
 691                         }
 692                         if (*p == '"')
 693                                 n += count*2 + 1;
 694                         continue;
 695                 }
 696                 len++;
 697                 p++;
 698         }
 699         if (!force_quotes && n == 0)
 700                 return arg;
 701
 702         /* insert \ where necessary */
 703         d = q = xmalloc(len+n+3);
 704         *d++ = '"';
 705         while (*arg) {
 706                 if (*arg == '"')
 707                         *d++ = '\\';
 708                 else if (*arg == '\\') {
 709                         int count = 0;
 710                         while (*arg == '\\') {
 711                                 count++;
 712                                 *d++ = *arg++;
 713                         }
 714                         if (*arg == '"') {
 715                                 while (count-- > 0)
 716                                         *d++ = '\\';
 717                                 *d++ = '\\';
 718                         }
 719                 }
 720                 *d++ = *arg++;
 721         }
 722         *d++ = '"';
 723         *d++ = 0;
 724         return q;
 725 }
 726
 727 static const char *parse_interpreter(const char *cmd)
 728 {
 729         static char buf[100];
 730         char *p, *opt;
 731         int n, fd;
 732
 733         /* don't even try a .exe */
 734         n = strlen(cmd);
 735         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 736                 return NULL;
 737
 738         fd = open(cmd, O_RDONLY);
 739         if (fd < 0)
 740                 return NULL;
 741         n = read(fd, buf, sizeof(buf)-1);
 742         close(fd);
 743         if (n < 4)      /* at least '#!/x' and not error */
 744                 return NULL;
 745
 746         if (buf[0] != '#' || buf[1] != '!')
 747                 return NULL;
 748         buf[n] = '\0';
 749         p = buf + strcspn(buf, "\r\n");
 750         if (!*p)
 751                 return NULL;
 752
 753         *p = '\0';
 754         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 755                 return NULL;
 756         /* strip options */
 757         if ((opt = strchr(p+1, ' ')))
 758                 *opt = '\0';
 759         return p+1;
 760 }
 761
 762 /*
 763  * Splits the PATH into parts.
 764  */
 765 static char **get_path_split(void)
 766 {
 767         char *p, **path, *envpath = mingw_getenv("PATH");
 768         int i, n = 0;
 769
 770         if (!envpath || !*envpath)
 771                 return NULL;
 772
 773         envpath = xstrdup(envpath);
 774         p = envpath;
 775         while (p) {
 776                 char *dir = p;
 777                 p = strchr(p, ';');
 778                 if (p) *p++ = '\0';
 779                 if (*dir) {     /* not earlier, catches series of ; */
 780                         ++n;
 781                 }
 782         }
 783         if (!n)
 784                 return NULL;
 785
 786         path = xmalloc((n+1)*sizeof(char *));
 787         p = envpath;
 788         i = 0;
 789         do {
 790                 if (*p)
 791                         path[i++] = xstrdup(p);
 792                 p = p+strlen(p)+1;
 793         } while (i < n);
 794         path[i] = NULL;
 795
 796         free(envpath);
 797
 798         return path;
 799 }
 800
 801 static void free_path_split(char **path)
 802 {
 803         char **p = path;
 804
 805         if (!path)
 806                 return;
 807
 808         while (*p)
 809                 free(*p++);
 810         free(path);
 811 }
 812
 813 /*
 814  * exe_only means that we only want to detect .exe files, but not scripts
 815  * (which do not have an extension)
 816  */
 817 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 818 {
 819         char path[MAX_PATH];
 820         snprintf(path, sizeof(path), "%s\\%s.exe", dir, cmd);
 821
 822         if (!isexe && access(path, F_OK) == 0)
 823                 return xstrdup(path);
 824         path[strlen(path)-4] = '\0';
 825         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 826                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 827                         return xstrdup(path);
 828         return NULL;
 829 }
 830
 831 /*
 832  * Determines the absolute path of cmd using the split path in path.
 833  * If cmd contains a slash or backslash, no lookup is performed.
 834  */
 835 static char *path_lookup(const char *cmd, char **path, int exe_only)
 836 {
 837         char *prog = NULL;
 838         int len = strlen(cmd);
 839         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 840
 841         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 842                 prog = xstrdup(cmd);
 843
 844         while (!prog && *path)
 845                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 846
 847         return prog;
 848 }
 849
 850 static int env_compare(const void *a, const void *b)
 851 {
 852         char *const *ea = a;
 853         char *const *eb = b;
 854         return strcasecmp(*ea, *eb);
 855 }
 856
 857 struct pinfo_t {
 858         struct pinfo_t *next;
 859         pid_t pid;
 860         HANDLE proc;
 861 } pinfo_t;
 862 struct pinfo_t *pinfo = NULL;
 863 CRITICAL_SECTION pinfo_cs;
 864
 865 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 866                               const char *dir,
 867                               int prepend_cmd, int fhin, int fhout, int fherr)
 868 {
 869         STARTUPINFO si;
 870         PROCESS_INFORMATION pi;
 871         struct strbuf envblk, args;
 872         unsigned flags;
 873         BOOL ret;
 874
 875         /* Determine whether or not we are associated to a console */
 876         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 877                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 878                         FILE_ATTRIBUTE_NORMAL, NULL);
 879         if (cons == INVALID_HANDLE_VALUE) {
 880                 /* There is no console associated with this process.
 881                  * Since the child is a console process, Windows
 882                  * would normally create a console window. But
 883                  * since we'll be redirecting std streams, we do
 884                  * not need the console.
 885                  * It is necessary to use DETACHED_PROCESS
 886                  * instead of CREATE_NO_WINDOW to make ssh
 887                  * recognize that it has no console.
 888                  */
 889                 flags = DETACHED_PROCESS;
 890         } else {
 891                 /* There is already a console. If we specified
 892                  * DETACHED_PROCESS here, too, Windows would
 893                  * disassociate the child from the console.
 894                  * The same is true for CREATE_NO_WINDOW.
 895                  * Go figure!
 896                  */
 897                 flags = 0;
 898                 CloseHandle(cons);
 899         }
 900         memset(&si, 0, sizeof(si));
 901         si.cb = sizeof(si);
 902         si.dwFlags = STARTF_USESTDHANDLES;
 903         si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 904         si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 905         si.hStdError = (HANDLE) _get_osfhandle(fherr);
 906
 907         /* concatenate argv, quoting args as we go */
 908         strbuf_init(&args, 0);
 909         if (prepend_cmd) {
 910                 char *quoted = (char *)quote_arg(cmd);
 911                 strbuf_addstr(&args, quoted);
 912                 if (quoted != cmd)
 913                         free(quoted);
 914         }
 915         for (; *argv; argv++) {
 916                 char *quoted = (char *)quote_arg(*argv);
 917                 if (*args.buf)
 918                         strbuf_addch(&args, ' ');
 919                 strbuf_addstr(&args, quoted);
 920                 if (quoted != *argv)
 921                         free(quoted);
 922         }
 923
 924         if (env) {
 925                 int count = 0;
 926                 char **e, **sorted_env;
 927
 928                 for (e = env; *e; e++)
 929                         count++;
 930
 931                 /* environment must be sorted */
 932                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 933                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 934                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 935
 936                 strbuf_init(&envblk, 0);
 937                 for (e = sorted_env; *e; e++) {
 938                         strbuf_addstr(&envblk, *e);
 939                         strbuf_addch(&envblk, '\0');
 940                 }
 941                 free(sorted_env);
 942         }
 943
 944         memset(&pi, 0, sizeof(pi));
 945         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 946                 env ? envblk.buf : NULL, dir, &si, &pi);
 947
 948         if (env)
 949                 strbuf_release(&envblk);
 950         strbuf_release(&args);
 951
 952         if (!ret) {
 953                 errno = ENOENT;
 954                 return -1;
 955         }
 956         CloseHandle(pi.hThread);
 957
 958         /*
 959          * The process ID is the human-readable identifier of the process
 960          * that we want to present in log and error messages. The handle
 961          * is not useful for this purpose. But we cannot close it, either,
 962          * because it is not possible to turn a process ID into a process
 963          * handle after the process terminated.
 964          * Keep the handle in a list for waitpid.
 965          */
 966         EnterCriticalSection(&pinfo_cs);
 967         {
 968                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
 969                 info->pid = pi.dwProcessId;
 970                 info->proc = pi.hProcess;
 971                 info->next = pinfo;
 972                 pinfo = info;
 973         }
 974         LeaveCriticalSection(&pinfo_cs);
 975
 976         return (pid_t)pi.dwProcessId;
 977 }
 978
 979 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 980                            int prepend_cmd)
 981 {
 982         return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 983 }
 984
 985 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 986                      const char *dir,
 987                      int fhin, int fhout, int fherr)
 988 {
 989         pid_t pid;
 990         char **path = get_path_split();
 991         char *prog = path_lookup(cmd, path, 0);
 992
 993         if (!prog) {
 994                 errno = ENOENT;
 995                 pid = -1;
 996         }
 997         else {
 998                 const char *interpr = parse_interpreter(prog);
 999
1000                 if (interpr) {
1001                         const char *argv0 = argv[0];
1002                         char *iprog = path_lookup(interpr, path, 1);
1003                         argv[0] = prog;
1004                         if (!iprog) {
1005                                 errno = ENOENT;
1006                                 pid = -1;
1007                         }
1008                         else {
1009                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
1010                                                        fhin, fhout, fherr);
1011                                 free(iprog);
1012                         }
1013                         argv[0] = argv0;
1014                 }
1015                 else
1016                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
1017                                                fhin, fhout, fherr);
1018                 free(prog);
1019         }
1020         free_path_split(path);
1021         return pid;
1022 }
1023
1024 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
1025 {
1026         const char *interpr = parse_interpreter(cmd);
1027         char **path;
1028         char *prog;
1029         int pid = 0;
1030
1031         if (!interpr)
1032                 return 0;
1033         path = get_path_split();
1034         prog = path_lookup(interpr, path, 1);
1035         if (prog) {
1036                 int argc = 0;
1037                 const char **argv2;
1038                 while (argv[argc]) argc++;
1039                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1040                 argv2[0] = (char *)cmd; /* full path to the script file */
1041                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1042                 pid = mingw_spawnve(prog, argv2, env, 1);
1043                 if (pid >= 0) {
1044                         int status;
1045                         if (waitpid(pid, &status, 0) < 0)
1046                                 status = 255;
1047                         exit(status);
1048                 }
1049                 pid = 1;        /* indicate that we tried but failed */
1050                 free(prog);
1051                 free(argv2);
1052         }
1053         free_path_split(path);
1054         return pid;
1055 }
1056
1057 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
1058 {
1059         /* check if git_command is a shell script */
1060         if (!try_shell_exec(cmd, argv, (char **)env)) {
1061                 int pid, status;
1062
1063                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
1064                 if (pid < 0)
1065                         return;
1066                 if (waitpid(pid, &status, 0) < 0)
1067                         status = 255;
1068                 exit(status);
1069         }
1070 }
1071
1072 void mingw_execvp(const char *cmd, char *const *argv)
1073 {
1074         char **path = get_path_split();
1075         char *prog = path_lookup(cmd, path, 0);
1076
1077         if (prog) {
1078                 mingw_execve(prog, argv, environ);
1079                 free(prog);
1080         } else
1081                 errno = ENOENT;
1082
1083         free_path_split(path);
1084 }
1085
1086 void mingw_execv(const char *cmd, char *const *argv)
1087 {
1088         mingw_execve(cmd, argv, environ);
1089 }
1090
1091 int mingw_kill(pid_t pid, int sig)
1092 {
1093         if (pid > 0 && sig == SIGTERM) {
1094                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1095
1096                 if (TerminateProcess(h, -1)) {
1097                         CloseHandle(h);
1098                         return 0;
1099                 }
1100
1101                 errno = err_win_to_posix(GetLastError());
1102                 CloseHandle(h);
1103                 return -1;
1104         }
1105
1106         errno = EINVAL;
1107         return -1;
1108 }
1109
1110 static char **copy_environ(void)
1111 {
1112         char **env;
1113         int i = 0;
1114         while (environ[i])
1115                 i++;
1116         env = xmalloc((i+1)*sizeof(*env));
1117         for (i = 0; environ[i]; i++)
1118                 env[i] = xstrdup(environ[i]);
1119         env[i] = NULL;
1120         return env;
1121 }
1122
1123 void free_environ(char **env)
1124 {
1125         int i;
1126         for (i = 0; env[i]; i++)
1127                 free(env[i]);
1128         free(env);
1129 }
1130
1131 static int lookup_env(char **env, const char *name, size_t nmln)
1132 {
1133         int i;
1134
1135         for (i = 0; env[i]; i++) {
1136                 if (0 == strncmp(env[i], name, nmln)
1137                     && '=' == env[i][nmln])
1138                         /* matches */
1139                         return i;
1140         }
1141         return -1;
1142 }
1143
1144 /*
1145  * If name contains '=', then sets the variable, otherwise it unsets it
1146  */
1147 static char **env_setenv(char **env, const char *name)
1148 {
1149         char *eq = strchrnul(name, '=');
1150         int i = lookup_env(env, name, eq-name);
1151
1152         if (i < 0) {
1153                 if (*eq) {
1154                         for (i = 0; env[i]; i++)
1155                                 ;
1156                         env = xrealloc(env, (i+2)*sizeof(*env));
1157                         env[i] = xstrdup(name);
1158                         env[i+1] = NULL;
1159                 }
1160         }
1161         else {
1162                 free(env[i]);
1163                 if (*eq)
1164                         env[i] = xstrdup(name);
1165                 else
1166                         for (; env[i]; i++)
1167                                 env[i] = env[i+1];
1168         }
1169         return env;
1170 }
1171
1172 /*
1173  * Copies global environ and adjusts variables as specified by vars.
1174  */
1175 char **make_augmented_environ(const char *const *vars)
1176 {
1177         char **env = copy_environ();
1178
1179         while (*vars)
1180                 env = env_setenv(env, *vars++);
1181         return env;
1182 }
1183
1184 #undef getenv
1185
1186 /*
1187  * The system's getenv looks up the name in a case-insensitive manner.
1188  * This version tries a case-sensitive lookup and falls back to
1189  * case-insensitive if nothing was found.  This is necessary because,
1190  * as a prominent example, CMD sets 'Path', but not 'PATH'.
1191  * Warning: not thread-safe.
1192  */
1193 static char *getenv_cs(const char *name)
1194 {
1195         size_t len = strlen(name);
1196         int i = lookup_env(environ, name, len);
1197         if (i >= 0)
1198                 return environ[i] + len + 1;    /* skip past name and '=' */
1199         return getenv(name);
1200 }
1201
1202 char *mingw_getenv(const char *name)
1203 {
1204         char *result = getenv_cs(name);
1205         if (!result && !strcmp(name, "TMPDIR")) {
1206                 /* on Windows it is TMP and TEMP */
1207                 result = getenv_cs("TMP");
1208                 if (!result)
1209                         result = getenv_cs("TEMP");
1210         }
1211         else if (!result && !strcmp(name, "TERM")) {
1212                 /* simulate TERM to enable auto-color (see color.c) */
1213                 result = "winansi";
1214         }
1215         return result;
1216 }
1217
1218 /*
1219  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1220  * that service contains a numerical port, or that it is null. It
1221  * does a simple search using gethostbyname, and returns one IPv4 host
1222  * if one was found.
1223  */
1224 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1225                                    const struct addrinfo *hints,
1226                                    struct addrinfo **res)
1227 {
1228         struct hostent *h = NULL;
1229         struct addrinfo *ai;
1230         struct sockaddr_in *sin;
1231
1232         if (node) {
1233                 h = gethostbyname(node);
1234                 if (!h)
1235                         return WSAGetLastError();
1236         }
1237
1238         ai = xmalloc(sizeof(struct addrinfo));
1239         *res = ai;
1240         ai->ai_flags = 0;
1241         ai->ai_family = AF_INET;
1242         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1243         switch (ai->ai_socktype) {
1244         case SOCK_STREAM:
1245                 ai->ai_protocol = IPPROTO_TCP;
1246                 break;
1247         case SOCK_DGRAM:
1248                 ai->ai_protocol = IPPROTO_UDP;
1249                 break;
1250         default:
1251                 ai->ai_protocol = 0;
1252                 break;
1253         }
1254         ai->ai_addrlen = sizeof(struct sockaddr_in);
1255         if (hints && (hints->ai_flags & AI_CANONNAME))
1256                 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1257         else
1258                 ai->ai_canonname = NULL;
1259
1260         sin = xmalloc(ai->ai_addrlen);
1261         memset(sin, 0, ai->ai_addrlen);
1262         sin->sin_family = AF_INET;
1263         /* Note: getaddrinfo is supposed to allow service to be a string,
1264          * which should be looked up using getservbyname. This is
1265          * currently not implemented */
1266         if (service)
1267                 sin->sin_port = htons(atoi(service));
1268         if (h)
1269                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1270         else if (hints && (hints->ai_flags & AI_PASSIVE))
1271                 sin->sin_addr.s_addr = INADDR_ANY;
1272         else
1273                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1274         ai->ai_addr = (struct sockaddr *)sin;
1275         ai->ai_next = 0;
1276         return 0;
1277 }
1278
1279 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1280 {
1281         free(res->ai_canonname);
1282         free(res->ai_addr);
1283         free(res);
1284 }
1285
1286 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1287                                    char *host, DWORD hostlen,
1288                                    char *serv, DWORD servlen, int flags)
1289 {
1290         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1291         if (sa->sa_family != AF_INET)
1292                 return EAI_FAMILY;
1293         if (!host && !serv)
1294                 return EAI_NONAME;
1295
1296         if (host && hostlen > 0) {
1297                 struct hostent *ent = NULL;
1298                 if (!(flags & NI_NUMERICHOST))
1299                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1300                                             sizeof(sin->sin_addr), AF_INET);
1301
1302                 if (ent)
1303                         snprintf(host, hostlen, "%s", ent->h_name);
1304                 else if (flags & NI_NAMEREQD)
1305                         return EAI_NONAME;
1306                 else
1307                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1308         }
1309
1310         if (serv && servlen > 0) {
1311                 struct servent *ent = NULL;
1312                 if (!(flags & NI_NUMERICSERV))
1313                         ent = getservbyport(sin->sin_port,
1314                                             flags & NI_DGRAM ? "udp" : "tcp");
1315
1316                 if (ent)
1317                         snprintf(serv, servlen, "%s", ent->s_name);
1318                 else
1319                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1320         }
1321
1322         return 0;
1323 }
1324
1325 static HMODULE ipv6_dll = NULL;
1326 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1327 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1328                                       const struct addrinfo *hints,
1329                                       struct addrinfo **res);
1330 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1331                                       char *host, DWORD hostlen,
1332                                       char *serv, DWORD servlen, int flags);
1333 /*
1334  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1335  * don't need to try to load that one dynamically.
1336  */
1337
1338 static void socket_cleanup(void)
1339 {
1340         WSACleanup();
1341         if (ipv6_dll)
1342                 FreeLibrary(ipv6_dll);
1343         ipv6_dll = NULL;
1344         ipv6_freeaddrinfo = freeaddrinfo_stub;
1345         ipv6_getaddrinfo = getaddrinfo_stub;
1346         ipv6_getnameinfo = getnameinfo_stub;
1347 }
1348
1349 static void ensure_socket_initialization(void)
1350 {
1351         WSADATA wsa;
1352         static int initialized = 0;
1353         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1354         const char **name;
1355
1356         if (initialized)
1357                 return;
1358
1359         if (WSAStartup(MAKEWORD(2,2), &wsa))
1360                 die("unable to initialize winsock subsystem, error %d",
1361                         WSAGetLastError());
1362
1363         for (name = libraries; *name; name++) {
1364                 ipv6_dll = LoadLibrary(*name);
1365                 if (!ipv6_dll)
1366                         continue;
1367
1368                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1369                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1370                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1371                                                    const struct addrinfo *,
1372                                                    struct addrinfo **))
1373                         GetProcAddress(ipv6_dll, "getaddrinfo");
1374                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1375                                                    socklen_t, char *, DWORD,
1376                                                    char *, DWORD, int))
1377                         GetProcAddress(ipv6_dll, "getnameinfo");
1378                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1379                         FreeLibrary(ipv6_dll);
1380                         ipv6_dll = NULL;
1381                 } else
1382                         break;
1383         }
1384         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1385                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1386                 ipv6_getaddrinfo = getaddrinfo_stub;
1387                 ipv6_getnameinfo = getnameinfo_stub;
1388         }
1389
1390         atexit(socket_cleanup);
1391         initialized = 1;
1392 }
1393
1394 #undef gethostname
1395 int mingw_gethostname(char *name, int namelen)
1396 {
1397     ensure_socket_initialization();
1398     return gethostname(name, namelen);
1399 }
1400
1401 #undef gethostbyname
1402 struct hostent *mingw_gethostbyname(const char *host)
1403 {
1404         ensure_socket_initialization();
1405         return gethostbyname(host);
1406 }
1407
1408 void mingw_freeaddrinfo(struct addrinfo *res)
1409 {
1410         ipv6_freeaddrinfo(res);
1411 }
1412
1413 int mingw_getaddrinfo(const char *node, const char *service,
1414                       const struct addrinfo *hints, struct addrinfo **res)
1415 {
1416         ensure_socket_initialization();
1417         return ipv6_getaddrinfo(node, service, hints, res);
1418 }
1419
1420 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1421                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1422                       int flags)
1423 {
1424         ensure_socket_initialization();
1425         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1426 }
1427
1428 int mingw_socket(int domain, int type, int protocol)
1429 {
1430         int sockfd;
1431         SOCKET s;
1432
1433         ensure_socket_initialization();
1434         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1435         if (s == INVALID_SOCKET) {
1436                 /*
1437                  * WSAGetLastError() values are regular BSD error codes
1438                  * biased by WSABASEERR.
1439                  * However, strerror() does not know about networking
1440                  * specific errors, which are values beginning at 38 or so.
1441                  * Therefore, we choose to leave the biased error code
1442                  * in errno so that _if_ someone looks up the code somewhere,
1443                  * then it is at least the number that are usually listed.
1444                  */
1445                 errno = WSAGetLastError();
1446                 return -1;
1447         }
1448         /* convert into a file descriptor */
1449         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1450                 closesocket(s);
1451                 return error("unable to make a socket file descriptor: %s",
1452                         strerror(errno));
1453         }
1454         return sockfd;
1455 }
1456
1457 #undef connect
1458 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1459 {
1460         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1461         return connect(s, sa, sz);
1462 }
1463
1464 #undef bind
1465 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1466 {
1467         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1468         return bind(s, sa, sz);
1469 }
1470
1471 #undef setsockopt
1472 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1473 {
1474         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1475         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1476 }
1477
1478 #undef shutdown
1479 int mingw_shutdown(int sockfd, int how)
1480 {
1481         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1482         return shutdown(s, how);
1483 }
1484
1485 #undef listen
1486 int mingw_listen(int sockfd, int backlog)
1487 {
1488         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1489         return listen(s, backlog);
1490 }
1491
1492 #undef accept
1493 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1494 {
1495         int sockfd2;
1496
1497         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1498         SOCKET s2 = accept(s1, sa, sz);
1499
1500         /* convert into a file descriptor */
1501         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1502                 int err = errno;
1503                 closesocket(s2);
1504                 return error("unable to make a socket file descriptor: %s",
1505                         strerror(err));
1506         }
1507         return sockfd2;
1508 }
1509
1510 #undef rename
1511 int mingw_rename(const char *pold, const char *pnew)
1512 {
1513         DWORD attrs, gle;
1514         int tries = 0;
1515
1516         /*
1517          * Try native rename() first to get errno right.
1518          * It is based on MoveFile(), which cannot overwrite existing files.
1519          */
1520         if (!rename(pold, pnew))
1521                 return 0;
1522         if (errno != EEXIST)
1523                 return -1;
1524 repeat:
1525         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1526                 return 0;
1527         /* TODO: translate more errors */
1528         gle = GetLastError();
1529         if (gle == ERROR_ACCESS_DENIED &&
1530             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1531                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1532                         errno = EISDIR;
1533                         return -1;
1534                 }
1535                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1536                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1537                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1538                                 return 0;
1539                         gle = GetLastError();
1540                         /* revert file attributes on failure */
1541                         SetFileAttributes(pnew, attrs);
1542                 }
1543         }
1544         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1545                 /*
1546                  * We assume that some other process had the source or
1547                  * destination file open at the wrong moment and retry.
1548                  * In order to give the other process a higher chance to
1549                  * complete its operation, we give up our time slice now.
1550                  * If we have to retry again, we do sleep a bit.
1551                  */
1552                 Sleep(delay[tries]);
1553                 tries++;
1554                 goto repeat;
1555         }
1556         if (gle == ERROR_ACCESS_DENIED &&
1557                ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1558                        "Should I try again?", pold, pnew))
1559                 goto repeat;
1560
1561         errno = EACCES;
1562         return -1;
1563 }
1564
1565 /*
1566  * Note that this doesn't return the actual pagesize, but
1567  * the allocation granularity. If future Windows specific git code
1568  * needs the real getpagesize function, we need to find another solution.
1569  */
1570 int mingw_getpagesize(void)
1571 {
1572         SYSTEM_INFO si;
1573         GetSystemInfo(&si);
1574         return si.dwAllocationGranularity;
1575 }
1576
1577 struct passwd *getpwuid(int uid)
1578 {
1579         static char user_name[100];
1580         static struct passwd p;
1581
1582         DWORD len = sizeof(user_name);
1583         if (!GetUserName(user_name, &len))
1584                 return NULL;
1585         p.pw_name = user_name;
1586         p.pw_gecos = "unknown";
1587         p.pw_dir = NULL;
1588         return &p;
1589 }
1590
1591 static HANDLE timer_event;
1592 static HANDLE timer_thread;
1593 static int timer_interval;
1594 static int one_shot;
1595 static sig_handler_t timer_fn = SIG_DFL;
1596
1597 /* The timer works like this:
1598  * The thread, ticktack(), is a trivial routine that most of the time
1599  * only waits to receive the signal to terminate. The main thread tells
1600  * the thread to terminate by setting the timer_event to the signalled
1601  * state.
1602  * But ticktack() interrupts the wait state after the timer's interval
1603  * length to call the signal handler.
1604  */
1605
1606 static unsigned __stdcall ticktack(void *dummy)
1607 {
1608         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1609                 if (timer_fn == SIG_DFL)
1610                         die("Alarm");
1611                 if (timer_fn != SIG_IGN)
1612                         timer_fn(SIGALRM);
1613                 if (one_shot)
1614                         break;
1615         }
1616         return 0;
1617 }
1618
1619 static int start_timer_thread(void)
1620 {
1621         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1622         if (timer_event) {
1623                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1624                 if (!timer_thread )
1625                         return errno = ENOMEM,
1626                                 error("cannot start timer thread");
1627         } else
1628                 return errno = ENOMEM,
1629                         error("cannot allocate resources for timer");
1630         return 0;
1631 }
1632
1633 static void stop_timer_thread(void)
1634 {
1635         if (timer_event)
1636                 SetEvent(timer_event);  /* tell thread to terminate */
1637         if (timer_thread) {
1638                 int rc = WaitForSingleObject(timer_thread, 1000);
1639                 if (rc == WAIT_TIMEOUT)
1640                         error("timer thread did not terminate timely");
1641                 else if (rc != WAIT_OBJECT_0)
1642                         error("waiting for timer thread failed: %lu",
1643                               GetLastError());
1644                 CloseHandle(timer_thread);
1645         }
1646         if (timer_event)
1647                 CloseHandle(timer_event);
1648         timer_event = NULL;
1649         timer_thread = NULL;
1650 }
1651
1652 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1653 {
1654         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1655 }
1656
1657 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1658 {
1659         static const struct timeval zero;
1660         static int atexit_done;
1661
1662         if (out != NULL)
1663                 return errno = EINVAL,
1664                         error("setitimer param 3 != NULL not implemented");
1665         if (!is_timeval_eq(&in->it_interval, &zero) &&
1666             !is_timeval_eq(&in->it_interval, &in->it_value))
1667                 return errno = EINVAL,
1668                         error("setitimer: it_interval must be zero or eq it_value");
1669
1670         if (timer_thread)
1671                 stop_timer_thread();
1672
1673         if (is_timeval_eq(&in->it_value, &zero) &&
1674             is_timeval_eq(&in->it_interval, &zero))
1675                 return 0;
1676
1677         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1678         one_shot = is_timeval_eq(&in->it_interval, &zero);
1679         if (!atexit_done) {
1680                 atexit(stop_timer_thread);
1681                 atexit_done = 1;
1682         }
1683         return start_timer_thread();
1684 }
1685
1686 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1687 {
1688         if (sig != SIGALRM)
1689                 return errno = EINVAL,
1690                         error("sigaction only implemented for SIGALRM");
1691         if (out != NULL)
1692                 return errno = EINVAL,
1693                         error("sigaction: param 3 != NULL not implemented");
1694
1695         timer_fn = in->sa_handler;
1696         return 0;
1697 }
1698
1699 #undef signal
1700 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1701 {
1702         sig_handler_t old = timer_fn;
1703         if (sig != SIGALRM)
1704                 return signal(sig, handler);
1705         timer_fn = handler;
1706         return old;
1707 }
1708
1709 static const char *make_backslash_path(const char *path)
1710 {
1711         static char buf[PATH_MAX + 1];
1712         char *c;
1713
1714         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1715                 die("Too long path: %.*s", 60, path);
1716
1717         for (c = buf; *c; c++) {
1718                 if (*c == '/')
1719                         *c = '\\';
1720         }
1721         return buf;
1722 }
1723
1724 void mingw_open_html(const char *unixpath)
1725 {
1726         const char *htmlpath = make_backslash_path(unixpath);
1727         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1728                         const char *, const char *, const char *, INT);
1729         T ShellExecute;
1730         HMODULE shell32;
1731         int r;
1732
1733         shell32 = LoadLibrary("shell32.dll");
1734         if (!shell32)
1735                 die("cannot load shell32.dll");
1736         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1737         if (!ShellExecute)
1738                 die("cannot run browser");
1739
1740         printf("Launching default browser to display HTML ...\n");
1741         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1742         FreeLibrary(shell32);
1743         /* see the MSDN documentation referring to the result codes here */
1744         if (r <= 32) {
1745                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1746         }
1747 }
1748
1749 int link(const char *oldpath, const char *newpath)
1750 {
1751         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1752         static T create_hard_link = NULL;
1753         if (!create_hard_link) {
1754                 create_hard_link = (T) GetProcAddress(
1755                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1756                 if (!create_hard_link)
1757                         create_hard_link = (T)-1;
1758         }
1759         if (create_hard_link == (T)-1) {
1760                 errno = ENOSYS;
1761                 return -1;
1762         }
1763         if (!create_hard_link(newpath, oldpath, NULL)) {
1764                 errno = err_win_to_posix(GetLastError());
1765                 return -1;
1766         }
1767         return 0;
1768 }
1769
1770 char *getpass(const char *prompt)
1771 {
1772         struct strbuf buf = STRBUF_INIT;
1773
1774         fputs(prompt, stderr);
1775         for (;;) {
1776                 char c = _getch();
1777                 if (c == '\r' || c == '\n')
1778                         break;
1779                 strbuf_addch(&buf, c);
1780         }
1781         fputs("\n", stderr);
1782         return strbuf_detach(&buf, NULL);
1783 }
1784
1785 pid_t waitpid(pid_t pid, int *status, int options)
1786 {
1787         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1788             FALSE, pid);
1789         if (!h) {
1790                 errno = ECHILD;
1791                 return -1;
1792         }
1793
1794         if (pid > 0 && options & WNOHANG) {
1795                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1796                         CloseHandle(h);
1797                         return 0;
1798                 }
1799                 options &= ~WNOHANG;
1800         }
1801
1802         if (options == 0) {
1803                 struct pinfo_t **ppinfo;
1804                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1805                         CloseHandle(h);
1806                         return 0;
1807                 }
1808
1809                 if (status)
1810                         GetExitCodeProcess(h, (LPDWORD)status);
1811
1812                 EnterCriticalSection(&pinfo_cs);
1813
1814                 ppinfo = &pinfo;
1815                 while (*ppinfo) {
1816                         struct pinfo_t *info = *ppinfo;
1817                         if (info->pid == pid) {
1818                                 CloseHandle(info->proc);
1819                                 *ppinfo = info->next;
1820                                 free(info);
1821                                 break;
1822                         }
1823                         ppinfo = &info->next;
1824                 }
1825
1826                 LeaveCriticalSection(&pinfo_cs);
1827
1828                 CloseHandle(h);
1829                 return pid;
1830         }
1831         CloseHandle(h);
1832
1833         errno = EINVAL;
1834         return -1;
1835 }
1836
1837 const char *get_windows_home_directory(void)
1838 {
1839         static const char *home_directory = NULL;
1840         struct strbuf buf = STRBUF_INIT;
1841
1842         if (home_directory)
1843                 return home_directory;
1844
1845         home_directory = getenv("HOME");
1846         if (home_directory && *home_directory)
1847                 return home_directory;
1848
1849         strbuf_addf(&buf, "%s/%s", getenv("HOMEDRIVE"), getenv("HOMEPATH"));
1850         home_directory = strbuf_detach(&buf, NULL);
1851
1852         return home_directory;
1853 }
1854
1855 int mingw_offset_1st_component(const char *path)
1856 {
1857         int offset = 0;
1858         if (has_dos_drive_prefix(path))
1859                 offset = 2;
1860
1861         /* unc paths */
1862         else if (is_dir_sep(path[0]) && is_dir_sep(path[1])) {
1863
1864                 /* skip server name */
1865                 char *pos = strpbrk(path + 2, "\\/");
1866                 if (!pos)
1867                         return 0; /* Error: malformed unc path */
1868
1869                 do {
1870                         pos++;
1871                 } while (*pos && !is_dir_sep(*pos));
1872
1873                 offset = pos - path;
1874         }
1875
1876         return offset + is_dir_sep(path[offset]);
1877 }
1878
1879 /*
1880  * Disable MSVCRT command line wildcard expansion (__getmainargs called from
1881  * mingw startup code, see init.c in mingw runtime).
1882  */
1883 int _CRT_glob = 0;
1884
1885 void mingw_startup()
1886 {
1887         /* copy executable name to argv[0] */
1888         __argv[0] = xstrdup(_pgmptr);
1889
1890         /* initialize critical section for waitpid pinfo_t list */
1891         InitializeCriticalSection(&pinfo_cs);
1892
1893         /* set up default file mode and file modes for stdin/out/err */
1894         _fmode = _O_BINARY;
1895         _setmode(_fileno(stdin), _O_BINARY);
1896         _setmode(_fileno(stdout), _O_BINARY);
1897         _setmode(_fileno(stderr), _O_BINARY);
1898 }