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