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