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] = 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         static 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 #undef getenv
 669 char *mingw_getenv(const char *name)
 670 {
 671         char *result = getenv(name);
 672         if (!result) {
 673                 if (!strcmp(name, "TMPDIR")) {
 674                         /* on Windows it is TMP and TEMP */
 675                         result = getenv("TMP");
 676                         if (!result)
 677                                 result = getenv("TEMP");
 678                 } else if (!strcmp(name, "TERM")) {
 679                         /* simulate TERM to enable auto-color (see color.c) */
 680                         result = "winansi";
 681                 }
 682         }
 683         return result;
 684 }
 685
 686 /*
 687  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 688  * (Parsing C++ Command-Line Arguments)
 689  */
 690 static const char *quote_arg(const char *arg)
 691 {
 692         /* count chars to quote */
 693         int len = 0, n = 0;
 694         int force_quotes = 0;
 695         char *q, *d;
 696         const char *p = arg;
 697         if (!*p) force_quotes = 1;
 698         while (*p) {
 699                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 700                         force_quotes = 1;
 701                 else if (*p == '"')
 702                         n++;
 703                 else if (*p == '\\') {
 704                         int count = 0;
 705                         while (*p == '\\') {
 706                                 count++;
 707                                 p++;
 708                                 len++;
 709                         }
 710                         if (*p == '"')
 711                                 n += count*2 + 1;
 712                         continue;
 713                 }
 714                 len++;
 715                 p++;
 716         }
 717         if (!force_quotes && n == 0)
 718                 return arg;
 719
 720         /* insert \ where necessary */
 721         d = q = xmalloc(len+n+3);
 722         *d++ = '"';
 723         while (*arg) {
 724                 if (*arg == '"')
 725                         *d++ = '\\';
 726                 else if (*arg == '\\') {
 727                         int count = 0;
 728                         while (*arg == '\\') {
 729                                 count++;
 730                                 *d++ = *arg++;
 731                         }
 732                         if (*arg == '"') {
 733                                 while (count-- > 0)
 734                                         *d++ = '\\';
 735                                 *d++ = '\\';
 736                         }
 737                 }
 738                 *d++ = *arg++;
 739         }
 740         *d++ = '"';
 741         *d++ = 0;
 742         return q;
 743 }
 744
 745 static const char *parse_interpreter(const char *cmd)
 746 {
 747         static char buf[100];
 748         char *p, *opt;
 749         int n, fd;
 750
 751         /* don't even try a .exe */
 752         n = strlen(cmd);
 753         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 754                 return NULL;
 755
 756         fd = open(cmd, O_RDONLY);
 757         if (fd < 0)
 758                 return NULL;
 759         n = read(fd, buf, sizeof(buf)-1);
 760         close(fd);
 761         if (n < 4)      /* at least '#!/x' and not error */
 762                 return NULL;
 763
 764         if (buf[0] != '#' || buf[1] != '!')
 765                 return NULL;
 766         buf[n] = '\0';
 767         p = buf + strcspn(buf, "\r\n");
 768         if (!*p)
 769                 return NULL;
 770
 771         *p = '\0';
 772         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 773                 return NULL;
 774         /* strip options */
 775         if ((opt = strchr(p+1, ' ')))
 776                 *opt = '\0';
 777         return p+1;
 778 }
 779
 780 /*
 781  * Splits the PATH into parts.
 782  */
 783 static char **get_path_split(void)
 784 {
 785         char *p, **path, *envpath = getenv("PATH");
 786         int i, n = 0;
 787
 788         if (!envpath || !*envpath)
 789                 return NULL;
 790
 791         envpath = xstrdup(envpath);
 792         p = envpath;
 793         while (p) {
 794                 char *dir = p;
 795                 p = strchr(p, ';');
 796                 if (p) *p++ = '\0';
 797                 if (*dir) {     /* not earlier, catches series of ; */
 798                         ++n;
 799                 }
 800         }
 801         if (!n)
 802                 return NULL;
 803
 804         path = xmalloc((n+1)*sizeof(char *));
 805         p = envpath;
 806         i = 0;
 807         do {
 808                 if (*p)
 809                         path[i++] = xstrdup(p);
 810                 p = p+strlen(p)+1;
 811         } while (i < n);
 812         path[i] = NULL;
 813
 814         free(envpath);
 815
 816         return path;
 817 }
 818
 819 static void free_path_split(char **path)
 820 {
 821         char **p = path;
 822
 823         if (!path)
 824                 return;
 825
 826         while (*p)
 827                 free(*p++);
 828         free(path);
 829 }
 830
 831 /*
 832  * exe_only means that we only want to detect .exe files, but not scripts
 833  * (which do not have an extension)
 834  */
 835 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 836 {
 837         char path[MAX_PATH];
 838         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 839
 840         if (!isexe && access(path, F_OK) == 0)
 841                 return xstrdup(path);
 842         path[strlen(path)-4] = '\0';
 843         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 844                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 845                         return xstrdup(path);
 846         return NULL;
 847 }
 848
 849 /*
 850  * Determines the absolute path of cmd using the split path in path.
 851  * If cmd contains a slash or backslash, no lookup is performed.
 852  */
 853 static char *path_lookup(const char *cmd, char **path, int exe_only)
 854 {
 855         char *prog = NULL;
 856         int len = strlen(cmd);
 857         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 858
 859         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 860                 prog = xstrdup(cmd);
 861
 862         while (!prog && *path)
 863                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 864
 865         return prog;
 866 }
 867
 868 static int env_compare(const void *a, const void *b)
 869 {
 870         char *const *ea = a;
 871         char *const *eb = b;
 872         return strcasecmp(*ea, *eb);
 873 }
 874
 875 struct pinfo_t {
 876         struct pinfo_t *next;
 877         pid_t pid;
 878         HANDLE proc;
 879 } pinfo_t;
 880 struct pinfo_t *pinfo = NULL;
 881 CRITICAL_SECTION pinfo_cs;
 882
 883 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 884                               const char *dir,
 885                               int prepend_cmd, int fhin, int fhout, int fherr)
 886 {
 887         STARTUPINFO si;
 888         PROCESS_INFORMATION pi;
 889         struct strbuf envblk, args;
 890         unsigned flags;
 891         BOOL ret;
 892
 893         /* Determine whether or not we are associated to a console */
 894         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 895                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 896                         FILE_ATTRIBUTE_NORMAL, NULL);
 897         if (cons == INVALID_HANDLE_VALUE) {
 898                 /* There is no console associated with this process.
 899                  * Since the child is a console process, Windows
 900                  * would normally create a console window. But
 901                  * since we'll be redirecting std streams, we do
 902                  * not need the console.
 903                  * It is necessary to use DETACHED_PROCESS
 904                  * instead of CREATE_NO_WINDOW to make ssh
 905                  * recognize that it has no console.
 906                  */
 907                 flags = DETACHED_PROCESS;
 908         } else {
 909                 /* There is already a console. If we specified
 910                  * DETACHED_PROCESS here, too, Windows would
 911                  * disassociate the child from the console.
 912                  * The same is true for CREATE_NO_WINDOW.
 913                  * Go figure!
 914                  */
 915                 flags = 0;
 916                 CloseHandle(cons);
 917         }
 918         memset(&si, 0, sizeof(si));
 919         si.cb = sizeof(si);
 920         si.dwFlags = STARTF_USESTDHANDLES;
 921         si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 922         si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 923         si.hStdError = (HANDLE) _get_osfhandle(fherr);
 924
 925         /* concatenate argv, quoting args as we go */
 926         strbuf_init(&args, 0);
 927         if (prepend_cmd) {
 928                 char *quoted = (char *)quote_arg(cmd);
 929                 strbuf_addstr(&args, quoted);
 930                 if (quoted != cmd)
 931                         free(quoted);
 932         }
 933         for (; *argv; argv++) {
 934                 char *quoted = (char *)quote_arg(*argv);
 935                 if (*args.buf)
 936                         strbuf_addch(&args, ' ');
 937                 strbuf_addstr(&args, quoted);
 938                 if (quoted != *argv)
 939                         free(quoted);
 940         }
 941
 942         if (env) {
 943                 int count = 0;
 944                 char **e, **sorted_env;
 945
 946                 for (e = env; *e; e++)
 947                         count++;
 948
 949                 /* environment must be sorted */
 950                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 951                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 952                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 953
 954                 strbuf_init(&envblk, 0);
 955                 for (e = sorted_env; *e; e++) {
 956                         strbuf_addstr(&envblk, *e);
 957                         strbuf_addch(&envblk, '\0');
 958                 }
 959                 free(sorted_env);
 960         }
 961
 962         memset(&pi, 0, sizeof(pi));
 963         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 964                 env ? envblk.buf : NULL, dir, &si, &pi);
 965
 966         if (env)
 967                 strbuf_release(&envblk);
 968         strbuf_release(&args);
 969
 970         if (!ret) {
 971                 errno = ENOENT;
 972                 return -1;
 973         }
 974         CloseHandle(pi.hThread);
 975
 976         /*
 977          * The process ID is the human-readable identifier of the process
 978          * that we want to present in log and error messages. The handle
 979          * is not useful for this purpose. But we cannot close it, either,
 980          * because it is not possible to turn a process ID into a process
 981          * handle after the process terminated.
 982          * Keep the handle in a list for waitpid.
 983          */
 984         EnterCriticalSection(&pinfo_cs);
 985         {
 986                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
 987                 info->pid = pi.dwProcessId;
 988                 info->proc = pi.hProcess;
 989                 info->next = pinfo;
 990                 pinfo = info;
 991         }
 992         LeaveCriticalSection(&pinfo_cs);
 993
 994         return (pid_t)pi.dwProcessId;
 995 }
 996
 997 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 998                            int prepend_cmd)
 999 {
1000         return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
1001 }
1002
1003 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
1004                      const char *dir,
1005                      int fhin, int fhout, int fherr)
1006 {
1007         pid_t pid;
1008         char **path = get_path_split();
1009         char *prog = path_lookup(cmd, path, 0);
1010
1011         if (!prog) {
1012                 errno = ENOENT;
1013                 pid = -1;
1014         }
1015         else {
1016                 const char *interpr = parse_interpreter(prog);
1017
1018                 if (interpr) {
1019                         const char *argv0 = argv[0];
1020                         char *iprog = path_lookup(interpr, path, 1);
1021                         argv[0] = prog;
1022                         if (!iprog) {
1023                                 errno = ENOENT;
1024                                 pid = -1;
1025                         }
1026                         else {
1027                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
1028                                                        fhin, fhout, fherr);
1029                                 free(iprog);
1030                         }
1031                         argv[0] = argv0;
1032                 }
1033                 else
1034                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
1035                                                fhin, fhout, fherr);
1036                 free(prog);
1037         }
1038         free_path_split(path);
1039         return pid;
1040 }
1041
1042 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
1043 {
1044         const char *interpr = parse_interpreter(cmd);
1045         char **path;
1046         char *prog;
1047         int pid = 0;
1048
1049         if (!interpr)
1050                 return 0;
1051         path = get_path_split();
1052         prog = path_lookup(interpr, path, 1);
1053         if (prog) {
1054                 int argc = 0;
1055                 const char **argv2;
1056                 while (argv[argc]) argc++;
1057                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1058                 argv2[0] = (char *)cmd; /* full path to the script file */
1059                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1060                 pid = mingw_spawnve(prog, argv2, env, 1);
1061                 if (pid >= 0) {
1062                         int status;
1063                         if (waitpid(pid, &status, 0) < 0)
1064                                 status = 255;
1065                         exit(status);
1066                 }
1067                 pid = 1;        /* indicate that we tried but failed */
1068                 free(prog);
1069                 free(argv2);
1070         }
1071         free_path_split(path);
1072         return pid;
1073 }
1074
1075 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
1076 {
1077         /* check if git_command is a shell script */
1078         if (!try_shell_exec(cmd, argv, (char **)env)) {
1079                 int pid, status;
1080
1081                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
1082                 if (pid < 0)
1083                         return;
1084                 if (waitpid(pid, &status, 0) < 0)
1085                         status = 255;
1086                 exit(status);
1087         }
1088 }
1089
1090 void mingw_execvp(const char *cmd, char *const *argv)
1091 {
1092         char **path = get_path_split();
1093         char *prog = path_lookup(cmd, path, 0);
1094
1095         if (prog) {
1096                 mingw_execve(prog, argv, environ);
1097                 free(prog);
1098         } else
1099                 errno = ENOENT;
1100
1101         free_path_split(path);
1102 }
1103
1104 void mingw_execv(const char *cmd, char *const *argv)
1105 {
1106         mingw_execve(cmd, argv, environ);
1107 }
1108
1109 int mingw_kill(pid_t pid, int sig)
1110 {
1111         if (pid > 0 && sig == SIGTERM) {
1112                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1113
1114                 if (TerminateProcess(h, -1)) {
1115                         CloseHandle(h);
1116                         return 0;
1117                 }
1118
1119                 errno = err_win_to_posix(GetLastError());
1120                 CloseHandle(h);
1121                 return -1;
1122         }
1123
1124         errno = EINVAL;
1125         return -1;
1126 }
1127
1128 static char **copy_environ(void)
1129 {
1130         char **env;
1131         int i = 0;
1132         while (environ[i])
1133                 i++;
1134         env = xmalloc((i+1)*sizeof(*env));
1135         for (i = 0; environ[i]; i++)
1136                 env[i] = xstrdup(environ[i]);
1137         env[i] = NULL;
1138         return env;
1139 }
1140
1141 void free_environ(char **env)
1142 {
1143         int i;
1144         for (i = 0; env[i]; i++)
1145                 free(env[i]);
1146         free(env);
1147 }
1148
1149 static int lookup_env(char **env, const char *name, size_t nmln)
1150 {
1151         int i;
1152
1153         for (i = 0; env[i]; i++) {
1154                 if (0 == strncmp(env[i], name, nmln)
1155                     && '=' == env[i][nmln])
1156                         /* matches */
1157                         return i;
1158         }
1159         return -1;
1160 }
1161
1162 /*
1163  * If name contains '=', then sets the variable, otherwise it unsets it
1164  */
1165 static char **env_setenv(char **env, const char *name)
1166 {
1167         char *eq = strchrnul(name, '=');
1168         int i = lookup_env(env, name, eq-name);
1169
1170         if (i < 0) {
1171                 if (*eq) {
1172                         for (i = 0; env[i]; i++)
1173                                 ;
1174                         env = xrealloc(env, (i+2)*sizeof(*env));
1175                         env[i] = xstrdup(name);
1176                         env[i+1] = NULL;
1177                 }
1178         }
1179         else {
1180                 free(env[i]);
1181                 if (*eq)
1182                         env[i] = xstrdup(name);
1183                 else
1184                         for (; env[i]; i++)
1185                                 env[i] = env[i+1];
1186         }
1187         return env;
1188 }
1189
1190 /*
1191  * Copies global environ and adjusts variables as specified by vars.
1192  */
1193 char **make_augmented_environ(const char *const *vars)
1194 {
1195         char **env = copy_environ();
1196
1197         while (*vars)
1198                 env = env_setenv(env, *vars++);
1199         return env;
1200 }
1201
1202 /*
1203  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1204  * that service contains a numerical port, or that it is null. It
1205  * does a simple search using gethostbyname, and returns one IPv4 host
1206  * if one was found.
1207  */
1208 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1209                                    const struct addrinfo *hints,
1210                                    struct addrinfo **res)
1211 {
1212         struct hostent *h = NULL;
1213         struct addrinfo *ai;
1214         struct sockaddr_in *sin;
1215
1216         if (node) {
1217                 h = gethostbyname(node);
1218                 if (!h)
1219                         return WSAGetLastError();
1220         }
1221
1222         ai = xmalloc(sizeof(struct addrinfo));
1223         *res = ai;
1224         ai->ai_flags = 0;
1225         ai->ai_family = AF_INET;
1226         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1227         switch (ai->ai_socktype) {
1228         case SOCK_STREAM:
1229                 ai->ai_protocol = IPPROTO_TCP;
1230                 break;
1231         case SOCK_DGRAM:
1232                 ai->ai_protocol = IPPROTO_UDP;
1233                 break;
1234         default:
1235                 ai->ai_protocol = 0;
1236                 break;
1237         }
1238         ai->ai_addrlen = sizeof(struct sockaddr_in);
1239         if (hints && (hints->ai_flags & AI_CANONNAME))
1240                 ai->ai_canonname = h ? strdup(h->h_name) : NULL;
1241         else
1242                 ai->ai_canonname = NULL;
1243
1244         sin = xmalloc(ai->ai_addrlen);
1245         memset(sin, 0, ai->ai_addrlen);
1246         sin->sin_family = AF_INET;
1247         /* Note: getaddrinfo is supposed to allow service to be a string,
1248          * which should be looked up using getservbyname. This is
1249          * currently not implemented */
1250         if (service)
1251                 sin->sin_port = htons(atoi(service));
1252         if (h)
1253                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1254         else if (hints && (hints->ai_flags & AI_PASSIVE))
1255                 sin->sin_addr.s_addr = INADDR_ANY;
1256         else
1257                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1258         ai->ai_addr = (struct sockaddr *)sin;
1259         ai->ai_next = 0;
1260         return 0;
1261 }
1262
1263 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1264 {
1265         free(res->ai_canonname);
1266         free(res->ai_addr);
1267         free(res);
1268 }
1269
1270 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1271                                    char *host, DWORD hostlen,
1272                                    char *serv, DWORD servlen, int flags)
1273 {
1274         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1275         if (sa->sa_family != AF_INET)
1276                 return EAI_FAMILY;
1277         if (!host && !serv)
1278                 return EAI_NONAME;
1279
1280         if (host && hostlen > 0) {
1281                 struct hostent *ent = NULL;
1282                 if (!(flags & NI_NUMERICHOST))
1283                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1284                                             sizeof(sin->sin_addr), AF_INET);
1285
1286                 if (ent)
1287                         snprintf(host, hostlen, "%s", ent->h_name);
1288                 else if (flags & NI_NAMEREQD)
1289                         return EAI_NONAME;
1290                 else
1291                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1292         }
1293
1294         if (serv && servlen > 0) {
1295                 struct servent *ent = NULL;
1296                 if (!(flags & NI_NUMERICSERV))
1297                         ent = getservbyport(sin->sin_port,
1298                                             flags & NI_DGRAM ? "udp" : "tcp");
1299
1300                 if (ent)
1301                         snprintf(serv, servlen, "%s", ent->s_name);
1302                 else
1303                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1304         }
1305
1306         return 0;
1307 }
1308
1309 static HMODULE ipv6_dll = NULL;
1310 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1311 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1312                                       const struct addrinfo *hints,
1313                                       struct addrinfo **res);
1314 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1315                                       char *host, DWORD hostlen,
1316                                       char *serv, DWORD servlen, int flags);
1317 /*
1318  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1319  * don't need to try to load that one dynamically.
1320  */
1321
1322 static void socket_cleanup(void)
1323 {
1324         WSACleanup();
1325         if (ipv6_dll)
1326                 FreeLibrary(ipv6_dll);
1327         ipv6_dll = NULL;
1328         ipv6_freeaddrinfo = freeaddrinfo_stub;
1329         ipv6_getaddrinfo = getaddrinfo_stub;
1330         ipv6_getnameinfo = getnameinfo_stub;
1331 }
1332
1333 static void ensure_socket_initialization(void)
1334 {
1335         WSADATA wsa;
1336         static int initialized = 0;
1337         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1338         const char **name;
1339
1340         if (initialized)
1341                 return;
1342
1343         if (WSAStartup(MAKEWORD(2,2), &wsa))
1344                 die("unable to initialize winsock subsystem, error %d",
1345                         WSAGetLastError());
1346
1347         for (name = libraries; *name; name++) {
1348                 ipv6_dll = LoadLibrary(*name);
1349                 if (!ipv6_dll)
1350                         continue;
1351
1352                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1353                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1354                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1355                                                    const struct addrinfo *,
1356                                                    struct addrinfo **))
1357                         GetProcAddress(ipv6_dll, "getaddrinfo");
1358                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1359                                                    socklen_t, char *, DWORD,
1360                                                    char *, DWORD, int))
1361                         GetProcAddress(ipv6_dll, "getnameinfo");
1362                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1363                         FreeLibrary(ipv6_dll);
1364                         ipv6_dll = NULL;
1365                 } else
1366                         break;
1367         }
1368         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1369                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1370                 ipv6_getaddrinfo = getaddrinfo_stub;
1371                 ipv6_getnameinfo = getnameinfo_stub;
1372         }
1373
1374         atexit(socket_cleanup);
1375         initialized = 1;
1376 }
1377
1378 #undef gethostbyname
1379 struct hostent *mingw_gethostbyname(const char *host)
1380 {
1381         ensure_socket_initialization();
1382         return gethostbyname(host);
1383 }
1384
1385 void mingw_freeaddrinfo(struct addrinfo *res)
1386 {
1387         ipv6_freeaddrinfo(res);
1388 }
1389
1390 int mingw_getaddrinfo(const char *node, const char *service,
1391                       const struct addrinfo *hints, struct addrinfo **res)
1392 {
1393         ensure_socket_initialization();
1394         return ipv6_getaddrinfo(node, service, hints, res);
1395 }
1396
1397 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1398                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1399                       int flags)
1400 {
1401         ensure_socket_initialization();
1402         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1403 }
1404
1405 int mingw_socket(int domain, int type, int protocol)
1406 {
1407         int sockfd;
1408         SOCKET s;
1409
1410         ensure_socket_initialization();
1411         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1412         if (s == INVALID_SOCKET) {
1413                 /*
1414                  * WSAGetLastError() values are regular BSD error codes
1415                  * biased by WSABASEERR.
1416                  * However, strerror() does not know about networking
1417                  * specific errors, which are values beginning at 38 or so.
1418                  * Therefore, we choose to leave the biased error code
1419                  * in errno so that _if_ someone looks up the code somewhere,
1420                  * then it is at least the number that are usually listed.
1421                  */
1422                 errno = WSAGetLastError();
1423                 return -1;
1424         }
1425         /* convert into a file descriptor */
1426         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1427                 closesocket(s);
1428                 return error("unable to make a socket file descriptor: %s",
1429                         strerror(errno));
1430         }
1431         return sockfd;
1432 }
1433
1434 #undef connect
1435 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1436 {
1437         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1438         return connect(s, sa, sz);
1439 }
1440
1441 #undef bind
1442 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1443 {
1444         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1445         return bind(s, sa, sz);
1446 }
1447
1448 #undef setsockopt
1449 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1450 {
1451         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1452         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1453 }
1454
1455 #undef shutdown
1456 int mingw_shutdown(int sockfd, int how)
1457 {
1458         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1459         return shutdown(s, how);
1460 }
1461
1462 #undef listen
1463 int mingw_listen(int sockfd, int backlog)
1464 {
1465         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1466         return listen(s, backlog);
1467 }
1468
1469 #undef accept
1470 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1471 {
1472         int sockfd2;
1473
1474         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1475         SOCKET s2 = accept(s1, sa, sz);
1476
1477         /* convert into a file descriptor */
1478         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1479                 int err = errno;
1480                 closesocket(s2);
1481                 return error("unable to make a socket file descriptor: %s",
1482                         strerror(err));
1483         }
1484         return sockfd2;
1485 }
1486
1487 #undef rename
1488 int mingw_rename(const char *pold, const char *pnew)
1489 {
1490         DWORD attrs, gle;
1491         int tries = 0;
1492
1493         /*
1494          * Try native rename() first to get errno right.
1495          * It is based on MoveFile(), which cannot overwrite existing files.
1496          */
1497         if (!rename(pold, pnew))
1498                 return 0;
1499         if (errno != EEXIST)
1500                 return -1;
1501 repeat:
1502         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1503                 return 0;
1504         /* TODO: translate more errors */
1505         gle = GetLastError();
1506         if (gle == ERROR_ACCESS_DENIED &&
1507             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1508                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1509                         errno = EISDIR;
1510                         return -1;
1511                 }
1512                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1513                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1514                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1515                                 return 0;
1516                         gle = GetLastError();
1517                         /* revert file attributes on failure */
1518                         SetFileAttributes(pnew, attrs);
1519                 }
1520         }
1521         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1522                 /*
1523                  * We assume that some other process had the source or
1524                  * destination file open at the wrong moment and retry.
1525                  * In order to give the other process a higher chance to
1526                  * complete its operation, we give up our time slice now.
1527                  * If we have to retry again, we do sleep a bit.
1528                  */
1529                 Sleep(delay[tries]);
1530                 tries++;
1531                 goto repeat;
1532         }
1533         if (gle == ERROR_ACCESS_DENIED &&
1534                ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1535                        "Should I try again?", pold, pnew))
1536                 goto repeat;
1537
1538         errno = EACCES;
1539         return -1;
1540 }
1541
1542 /*
1543  * Note that this doesn't return the actual pagesize, but
1544  * the allocation granularity. If future Windows specific git code
1545  * needs the real getpagesize function, we need to find another solution.
1546  */
1547 int mingw_getpagesize(void)
1548 {
1549         SYSTEM_INFO si;
1550         GetSystemInfo(&si);
1551         return si.dwAllocationGranularity;
1552 }
1553
1554 struct passwd *getpwuid(int uid)
1555 {
1556         static char user_name[100];
1557         static struct passwd p;
1558
1559         DWORD len = sizeof(user_name);
1560         if (!GetUserName(user_name, &len))
1561                 return NULL;
1562         p.pw_name = user_name;
1563         p.pw_gecos = "unknown";
1564         p.pw_dir = NULL;
1565         return &p;
1566 }
1567
1568 static HANDLE timer_event;
1569 static HANDLE timer_thread;
1570 static int timer_interval;
1571 static int one_shot;
1572 static sig_handler_t timer_fn = SIG_DFL;
1573
1574 /* The timer works like this:
1575  * The thread, ticktack(), is a trivial routine that most of the time
1576  * only waits to receive the signal to terminate. The main thread tells
1577  * the thread to terminate by setting the timer_event to the signalled
1578  * state.
1579  * But ticktack() interrupts the wait state after the timer's interval
1580  * length to call the signal handler.
1581  */
1582
1583 static unsigned __stdcall ticktack(void *dummy)
1584 {
1585         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1586                 if (timer_fn == SIG_DFL)
1587                         die("Alarm");
1588                 if (timer_fn != SIG_IGN)
1589                         timer_fn(SIGALRM);
1590                 if (one_shot)
1591                         break;
1592         }
1593         return 0;
1594 }
1595
1596 static int start_timer_thread(void)
1597 {
1598         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1599         if (timer_event) {
1600                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1601                 if (!timer_thread )
1602                         return errno = ENOMEM,
1603                                 error("cannot start timer thread");
1604         } else
1605                 return errno = ENOMEM,
1606                         error("cannot allocate resources for timer");
1607         return 0;
1608 }
1609
1610 static void stop_timer_thread(void)
1611 {
1612         if (timer_event)
1613                 SetEvent(timer_event);  /* tell thread to terminate */
1614         if (timer_thread) {
1615                 int rc = WaitForSingleObject(timer_thread, 1000);
1616                 if (rc == WAIT_TIMEOUT)
1617                         error("timer thread did not terminate timely");
1618                 else if (rc != WAIT_OBJECT_0)
1619                         error("waiting for timer thread failed: %lu",
1620                               GetLastError());
1621                 CloseHandle(timer_thread);
1622         }
1623         if (timer_event)
1624                 CloseHandle(timer_event);
1625         timer_event = NULL;
1626         timer_thread = NULL;
1627 }
1628
1629 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1630 {
1631         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1632 }
1633
1634 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1635 {
1636         static const struct timeval zero;
1637         static int atexit_done;
1638
1639         if (out != NULL)
1640                 return errno = EINVAL,
1641                         error("setitimer param 3 != NULL not implemented");
1642         if (!is_timeval_eq(&in->it_interval, &zero) &&
1643             !is_timeval_eq(&in->it_interval, &in->it_value))
1644                 return errno = EINVAL,
1645                         error("setitimer: it_interval must be zero or eq it_value");
1646
1647         if (timer_thread)
1648                 stop_timer_thread();
1649
1650         if (is_timeval_eq(&in->it_value, &zero) &&
1651             is_timeval_eq(&in->it_interval, &zero))
1652                 return 0;
1653
1654         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1655         one_shot = is_timeval_eq(&in->it_interval, &zero);
1656         if (!atexit_done) {
1657                 atexit(stop_timer_thread);
1658                 atexit_done = 1;
1659         }
1660         return start_timer_thread();
1661 }
1662
1663 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1664 {
1665         if (sig != SIGALRM)
1666                 return errno = EINVAL,
1667                         error("sigaction only implemented for SIGALRM");
1668         if (out != NULL)
1669                 return errno = EINVAL,
1670                         error("sigaction: param 3 != NULL not implemented");
1671
1672         timer_fn = in->sa_handler;
1673         return 0;
1674 }
1675
1676 #undef signal
1677 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1678 {
1679         sig_handler_t old = timer_fn;
1680         if (sig != SIGALRM)
1681                 return signal(sig, handler);
1682         timer_fn = handler;
1683         return old;
1684 }
1685
1686 static const char *make_backslash_path(const char *path)
1687 {
1688         static char buf[PATH_MAX + 1];
1689         char *c;
1690
1691         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1692                 die("Too long path: %.*s", 60, path);
1693
1694         for (c = buf; *c; c++) {
1695                 if (*c == '/')
1696                         *c = '\\';
1697         }
1698         return buf;
1699 }
1700
1701 void mingw_open_html(const char *unixpath)
1702 {
1703         const char *htmlpath = make_backslash_path(unixpath);
1704         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1705                         const char *, const char *, const char *, INT);
1706         T ShellExecute;
1707         HMODULE shell32;
1708         int r;
1709
1710         shell32 = LoadLibrary("shell32.dll");
1711         if (!shell32)
1712                 die("cannot load shell32.dll");
1713         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1714         if (!ShellExecute)
1715                 die("cannot run browser");
1716
1717         printf("Launching default browser to display HTML ...\n");
1718         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1719         FreeLibrary(shell32);
1720         /* see the MSDN documentation referring to the result codes here */
1721         if (r <= 32) {
1722                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1723         }
1724 }
1725
1726 int link(const char *oldpath, const char *newpath)
1727 {
1728         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1729         static T create_hard_link = NULL;
1730         if (!create_hard_link) {
1731                 create_hard_link = (T) GetProcAddress(
1732                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1733                 if (!create_hard_link)
1734                         create_hard_link = (T)-1;
1735         }
1736         if (create_hard_link == (T)-1) {
1737                 errno = ENOSYS;
1738                 return -1;
1739         }
1740         if (!create_hard_link(newpath, oldpath, NULL)) {
1741                 errno = err_win_to_posix(GetLastError());
1742                 return -1;
1743         }
1744         return 0;
1745 }
1746
1747 char *getpass(const char *prompt)
1748 {
1749         struct strbuf buf = STRBUF_INIT;
1750
1751         fputs(prompt, stderr);
1752         for (;;) {
1753                 char c = _getch();
1754                 if (c == '\r' || c == '\n')
1755                         break;
1756                 strbuf_addch(&buf, c);
1757         }
1758         fputs("\n", stderr);
1759         return strbuf_detach(&buf, NULL);
1760 }
1761
1762 pid_t waitpid(pid_t pid, int *status, unsigned options)
1763 {
1764         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1765             FALSE, pid);
1766         if (!h) {
1767                 errno = ECHILD;
1768                 return -1;
1769         }
1770
1771         if (pid > 0 && options & WNOHANG) {
1772                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1773                         CloseHandle(h);
1774                         return 0;
1775                 }
1776                 options &= ~WNOHANG;
1777         }
1778
1779         if (options == 0) {
1780                 struct pinfo_t **ppinfo;
1781                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1782                         CloseHandle(h);
1783                         return 0;
1784                 }
1785
1786                 if (status)
1787                         GetExitCodeProcess(h, (LPDWORD)status);
1788
1789                 EnterCriticalSection(&pinfo_cs);
1790
1791                 ppinfo = &pinfo;
1792                 while (*ppinfo) {
1793                         struct pinfo_t *info = *ppinfo;
1794                         if (info->pid == pid) {
1795                                 CloseHandle(info->proc);
1796                                 *ppinfo = info->next;
1797                                 free(info);
1798                                 break;
1799                         }
1800                         ppinfo = &info->next;
1801                 }
1802
1803                 LeaveCriticalSection(&pinfo_cs);
1804
1805                 CloseHandle(h);
1806                 return pid;
1807         }
1808         CloseHandle(h);
1809
1810         errno = EINVAL;
1811         return -1;
1812 }
1813
1814 const char *get_windows_home_directory(void)
1815 {
1816         static const char *home_directory = NULL;
1817         struct strbuf buf = STRBUF_INIT;
1818
1819         if (home_directory)
1820                 return home_directory;
1821
1822         home_directory = getenv("HOME");
1823         if (home_directory && *home_directory)
1824                 return home_directory;
1825
1826         strbuf_addf(&buf, "%s/%s", getenv("HOMEDRIVE"), getenv("HOMEPATH"));
1827         home_directory = strbuf_detach(&buf, NULL);
1828
1829         return home_directory;
1830 }
1831
1832 int mingw_offset_1st_component(const char *path)
1833 {
1834         int offset = 0;
1835         if (has_dos_drive_prefix(path))
1836                 offset = 2;
1837
1838         /* unc paths */
1839         else if (is_dir_sep(path[0]) && is_dir_sep(path[1])) {
1840
1841                 /* skip server name */
1842                 char *pos = strpbrk(path + 2, "\\/");
1843                 if (!pos)
1844                         return 0; /* Error: malformed unc path */
1845
1846                 do {
1847                         pos++;
1848                 } while (*pos && !is_dir_sep(*pos));
1849
1850                 offset = pos - path;
1851         }
1852
1853         return offset + is_dir_sep(path[offset]);
1854 }