compat/mingw.c

   1 #include "../git-compat-util.h"
   2 #include "win32.h"
   3 #include <conio.h>
   4 #include "../strbuf.h"
   5 #include "../run-command.h"
   6 #include "../cache.h"
   7
   8 static const int delay[] = { 0, 1, 10, 20, 40 };
   9 unsigned int _CRT_fmode = _O_BINARY;
  10
  11 int err_win_to_posix(DWORD winerr)
  12 {
  13         int error = ENOSYS;
  14         switch(winerr) {
  15         case ERROR_ACCESS_DENIED: error = EACCES; break;
  16         case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  17         case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  18         case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  19         case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  20         case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  21         case ERROR_BAD_COMMAND: error = EIO; break;
  22         case ERROR_BAD_DEVICE: error = ENODEV; break;
  23         case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  24         case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  25         case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  26         case ERROR_BAD_LENGTH: error = EINVAL; break;
  27         case ERROR_BAD_PATHNAME: error = ENOENT; break;
  28         case ERROR_BAD_PIPE: error = EPIPE; break;
  29         case ERROR_BAD_UNIT: error = ENODEV; break;
  30         case ERROR_BAD_USERNAME: error = EINVAL; break;
  31         case ERROR_BROKEN_PIPE: error = EPIPE; break;
  32         case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  33         case ERROR_BUSY: error = EBUSY; break;
  34         case ERROR_BUSY_DRIVE: error = EBUSY; break;
  35         case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  36         case ERROR_CANNOT_MAKE: error = EACCES; break;
  37         case ERROR_CANTOPEN: error = EIO; break;
  38         case ERROR_CANTREAD: error = EIO; break;
  39         case ERROR_CANTWRITE: error = EIO; break;
  40         case ERROR_CRC: error = EIO; break;
  41         case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  42         case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  43         case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  44         case ERROR_DIRECTORY: error = EINVAL; break;
  45         case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  46         case ERROR_DISK_CHANGE: error = EIO; break;
  47         case ERROR_DISK_FULL: error = ENOSPC; break;
  48         case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  49         case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  50         case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  51         case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  52         case ERROR_FILE_EXISTS: error = EEXIST; break;
  53         case ERROR_FILE_INVALID: error = ENODEV; break;
  54         case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  55         case ERROR_GEN_FAILURE: error = EIO; break;
  56         case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  57         case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  58         case ERROR_INVALID_ACCESS: error = EACCES; break;
  59         case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  60         case ERROR_INVALID_BLOCK: error = EFAULT; break;
  61         case ERROR_INVALID_DATA: error = EINVAL; break;
  62         case ERROR_INVALID_DRIVE: error = ENODEV; break;
  63         case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  64         case ERROR_INVALID_FLAGS: error = EINVAL; break;
  65         case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  66         case ERROR_INVALID_HANDLE: error = EBADF; break;
  67         case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  68         case ERROR_INVALID_NAME: error = EINVAL; break;
  69         case ERROR_INVALID_OWNER: error = EINVAL; break;
  70         case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  71         case ERROR_INVALID_PASSWORD: error = EPERM; break;
  72         case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  73         case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  74         case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  75         case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  76         case ERROR_IO_DEVICE: error = EIO; break;
  77         case ERROR_IO_INCOMPLETE: error = EINTR; break;
  78         case ERROR_LOCKED: error = EBUSY; break;
  79         case ERROR_LOCK_VIOLATION: error = EACCES; break;
  80         case ERROR_LOGON_FAILURE: error = EACCES; break;
  81         case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  82         case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  83         case ERROR_MORE_DATA: error = EPIPE; break;
  84         case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  85         case ERROR_NOACCESS: error = EFAULT; break;
  86         case ERROR_NONE_MAPPED: error = EINVAL; break;
  87         case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  88         case ERROR_NOT_READY: error = EAGAIN; break;
  89         case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  90         case ERROR_NO_DATA: error = EPIPE; break;
  91         case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  92         case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  93         case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  94         case ERROR_OPEN_FAILED: error = EIO; break;
  95         case ERROR_OPEN_FILES: error = EBUSY; break;
  96         case ERROR_OPERATION_ABORTED: error = EINTR; break;
  97         case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  98         case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
  99         case ERROR_PATH_BUSY: error = EBUSY; break;
 100         case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
 101         case ERROR_PIPE_BUSY: error = EBUSY; break;
 102         case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 103         case ERROR_PIPE_LISTENING: error = EPIPE; break;
 104         case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 105         case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 106         case ERROR_READ_FAULT: error = EIO; break;
 107         case ERROR_SEEK: error = EIO; break;
 108         case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 109         case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 110         case ERROR_SHARING_VIOLATION: error = EACCES; break;
 111         case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 112         case ERROR_SWAPERROR: error = ENOENT; break;
 113         case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 114         case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 115         case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 116         case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 117         case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 118         case ERROR_WRITE_FAULT: error = EIO; break;
 119         case ERROR_WRITE_PROTECT: error = EROFS; break;
 120         }
 121         return error;
 122 }
 123
 124 static inline int is_file_in_use_error(DWORD errcode)
 125 {
 126         switch (errcode) {
 127         case ERROR_SHARING_VIOLATION:
 128         case ERROR_ACCESS_DENIED:
 129                 return 1;
 130         }
 131
 132         return 0;
 133 }
 134
 135 static int read_yes_no_answer(void)
 136 {
 137         char answer[1024];
 138
 139         if (fgets(answer, sizeof(answer), stdin)) {
 140                 size_t answer_len = strlen(answer);
 141                 int got_full_line = 0, c;
 142
 143                 /* remove the newline */
 144                 if (answer_len >= 2 && answer[answer_len-2] == '\r') {
 145                         answer[answer_len-2] = '\0';
 146                         got_full_line = 1;
 147                 } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
 148                         answer[answer_len-1] = '\0';
 149                         got_full_line = 1;
 150                 }
 151                 /* flush the buffer in case we did not get the full line */
 152                 if (!got_full_line)
 153                         while ((c = getchar()) != EOF && c != '\n')
 154                                 ;
 155         } else
 156                 /* we could not read, return the
 157                  * default answer which is no */
 158                 return 0;
 159
 160         if (tolower(answer[0]) == 'y' && !answer[1])
 161                 return 1;
 162         if (!strncasecmp(answer, "yes", sizeof(answer)))
 163                 return 1;
 164         if (tolower(answer[0]) == 'n' && !answer[1])
 165                 return 0;
 166         if (!strncasecmp(answer, "no", sizeof(answer)))
 167                 return 0;
 168
 169         /* did not find an answer we understand */
 170         return -1;
 171 }
 172
 173 static int ask_yes_no_if_possible(const char *format, ...)
 174 {
 175         char question[4096];
 176         const char *retry_hook[] = { NULL, NULL, NULL };
 177         va_list args;
 178
 179         va_start(args, format);
 180         vsnprintf(question, sizeof(question), format, args);
 181         va_end(args);
 182
 183         if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) {
 184                 retry_hook[1] = question;
 185                 return !run_command_v_opt(retry_hook, 0);
 186         }
 187
 188         if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
 189                 return 0;
 190
 191         while (1) {
 192                 int answer;
 193                 fprintf(stderr, "%s (y/n) ", question);
 194
 195                 if ((answer = read_yes_no_answer()) >= 0)
 196                         return answer;
 197
 198                 fprintf(stderr, "Sorry, I did not understand your answer. "
 199                                 "Please type 'y' or 'n'\n");
 200         }
 201 }
 202
 203 #undef unlink
 204 int mingw_unlink(const char *pathname)
 205 {
 206         int ret, tries = 0;
 207
 208         /* read-only files cannot be removed */
 209         chmod(pathname, 0666);
 210         while ((ret = unlink(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 211                 if (!is_file_in_use_error(GetLastError()))
 212                         break;
 213                 /*
 214                  * We assume that some other process had the source or
 215                  * destination file open at the wrong moment and retry.
 216                  * In order to give the other process a higher chance to
 217                  * complete its operation, we give up our time slice now.
 218                  * If we have to retry again, we do sleep a bit.
 219                  */
 220                 Sleep(delay[tries]);
 221                 tries++;
 222         }
 223         while (ret == -1 && is_file_in_use_error(GetLastError()) &&
 224                ask_yes_no_if_possible("Unlink of file '%s' failed. "
 225                         "Should I try again?", pathname))
 226                ret = unlink(pathname);
 227         return ret;
 228 }
 229
 230 static int is_dir_empty(const char *path)
 231 {
 232         struct strbuf buf = STRBUF_INIT;
 233         WIN32_FIND_DATAA findbuf;
 234         HANDLE handle;
 235
 236         strbuf_addf(&buf, "%s\\*", path);
 237         handle = FindFirstFileA(buf.buf, &findbuf);
 238         if (handle == INVALID_HANDLE_VALUE) {
 239                 strbuf_release(&buf);
 240                 return GetLastError() == ERROR_NO_MORE_FILES;
 241         }
 242
 243         while (!strcmp(findbuf.cFileName, ".") ||
 244                         !strcmp(findbuf.cFileName, ".."))
 245                 if (!FindNextFile(handle, &findbuf)) {
 246                         strbuf_release(&buf);
 247                         return GetLastError() == ERROR_NO_MORE_FILES;
 248                 }
 249         FindClose(handle);
 250         strbuf_release(&buf);
 251         return 0;
 252 }
 253
 254 #undef rmdir
 255 int mingw_rmdir(const char *pathname)
 256 {
 257         int ret, tries = 0;
 258
 259         while ((ret = rmdir(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 260                 if (!is_file_in_use_error(GetLastError()))
 261                         errno = err_win_to_posix(GetLastError());
 262                 if (errno != EACCES)
 263                         break;
 264                 if (!is_dir_empty(pathname)) {
 265                         errno = ENOTEMPTY;
 266                         break;
 267                 }
 268                 /*
 269                  * We assume that some other process had the source or
 270                  * destination file open at the wrong moment and retry.
 271                  * In order to give the other process a higher chance to
 272                  * complete its operation, we give up our time slice now.
 273                  * If we have to retry again, we do sleep a bit.
 274                  */
 275                 Sleep(delay[tries]);
 276                 tries++;
 277         }
 278         while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
 279                ask_yes_no_if_possible("Deletion of directory '%s' failed. "
 280                         "Should I try again?", pathname))
 281                ret = rmdir(pathname);
 282         return ret;
 283 }
 284
 285 static int make_hidden(const char *path)
 286 {
 287         DWORD attribs = GetFileAttributes(path);
 288         if (SetFileAttributes(path, FILE_ATTRIBUTE_HIDDEN | attribs))
 289                 return 0;
 290         errno = err_win_to_posix(GetLastError());
 291         return -1;
 292 }
 293
 294 void mingw_mark_as_git_dir(const char *dir)
 295 {
 296         if (hide_dotfiles != HIDE_DOTFILES_FALSE && !is_bare_repository() &&
 297             make_hidden(dir))
 298                 warning("Failed to make '%s' hidden", dir);
 299         git_config_set("core.hideDotFiles",
 300                 hide_dotfiles == HIDE_DOTFILES_FALSE ? "false" :
 301                 (hide_dotfiles == HIDE_DOTFILES_DOTGITONLY ?
 302                  "dotGitOnly" : "true"));
 303 }
 304
 305 #undef mkdir
 306 int mingw_mkdir(const char *path, int mode)
 307 {
 308         int ret = mkdir(path);
 309         if (!ret && hide_dotfiles == HIDE_DOTFILES_TRUE) {
 310                 /*
 311                  * In Windows a file or dir starting with a dot is not
 312                  * automatically hidden. So lets mark it as hidden when
 313                  * such a directory is created.
 314                  */
 315                 const char *start = basename((char*)path);
 316                 if (*start == '.')
 317                         return make_hidden(path);
 318         }
 319         return ret;
 320 }
 321
 322 #undef open
 323 int mingw_open (const char *filename, int oflags, ...)
 324 {
 325         va_list args;
 326         unsigned mode;
 327         int fd;
 328
 329         va_start(args, oflags);
 330         mode = va_arg(args, int);
 331         va_end(args);
 332
 333         if (filename && !strcmp(filename, "/dev/null"))
 334                 filename = "nul";
 335
 336         fd = open(filename, oflags, mode);
 337
 338         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 339                 DWORD attrs = GetFileAttributes(filename);
 340                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 341                         errno = EISDIR;
 342         }
 343         if ((oflags & O_CREAT) && fd >= 0 &&
 344             hide_dotfiles == HIDE_DOTFILES_TRUE) {
 345                 /*
 346                  * In Windows a file or dir starting with a dot is not
 347                  * automatically hidden. So lets mark it as hidden when
 348                  * such a file is created.
 349                  */
 350                 const char *start = basename((char*)filename);
 351                 if (*start == '.' && make_hidden(filename))
 352                         warning("Could not mark '%s' as hidden.", filename);
 353         }
 354         return fd;
 355 }
 356
 357 #undef write
 358 ssize_t mingw_write(int fd, const void *buf, size_t count)
 359 {
 360         /*
 361          * While write() calls to a file on a local disk are translated
 362          * into WriteFile() calls with a maximum size of 64KB on Windows
 363          * XP and 256KB on Vista, no such cap is placed on writes to
 364          * files over the network on Windows XP.  Unfortunately, there
 365          * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 366          * bigger writes fail on Windows XP.
 367          * So we cap to a nice 31MB here to avoid write failures over
 368          * the net without changing the number of WriteFile() calls in
 369          * the local case.
 370          */
 371         return write(fd, buf, min(count, 31 * 1024 * 1024));
 372 }
 373
 374 static BOOL WINAPI ctrl_ignore(DWORD type)
 375 {
 376         return TRUE;
 377 }
 378
 379 #undef fgetc
 380 int mingw_fgetc(FILE *stream)
 381 {
 382         int ch;
 383         if (!isatty(_fileno(stream)))
 384                 return fgetc(stream);
 385
 386         SetConsoleCtrlHandler(ctrl_ignore, TRUE);
 387         while (1) {
 388                 ch = fgetc(stream);
 389                 if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
 390                         break;
 391
 392                 /* Ctrl+C was pressed, simulate SIGINT and retry */
 393                 mingw_raise(SIGINT);
 394         }
 395         SetConsoleCtrlHandler(ctrl_ignore, FALSE);
 396         return ch;
 397 }
 398
 399 #undef fopen
 400 FILE *mingw_fopen (const char *filename, const char *otype)
 401 {
 402         int hide = 0;
 403         FILE *file;
 404         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 405             basename((char*)filename)[0] == '.')
 406                 hide = access(filename, F_OK);
 407         if (filename && !strcmp(filename, "/dev/null"))
 408                 filename = "nul";
 409         file = fopen(filename, otype);
 410         if (file && hide && make_hidden(filename))
 411                 warning("Could not mark '%s' as hidden.", filename);
 412         return file;
 413 }
 414
 415 #undef freopen
 416 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 417 {
 418         int hide = 0;
 419         FILE *file;
 420         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 421             basename((char*)filename)[0] == '.')
 422                 hide = access(filename, F_OK);
 423         if (filename && !strcmp(filename, "/dev/null"))
 424                 filename = "nul";
 425         file = freopen(filename, otype, stream);
 426         if (file && hide && make_hidden(filename))
 427                 warning("Could not mark '%s' as hidden.", filename);
 428         return file;
 429 }
 430
 431 #undef fflush
 432 int mingw_fflush(FILE *stream)
 433 {
 434         int ret = fflush(stream);
 435
 436         /*
 437          * write() is used behind the scenes of stdio output functions.
 438          * Since git code does not check for errors after each stdio write
 439          * operation, it can happen that write() is called by a later
 440          * stdio function even if an earlier write() call failed. In the
 441          * case of a pipe whose readable end was closed, only the first
 442          * call to write() reports EPIPE on Windows. Subsequent write()
 443          * calls report EINVAL. It is impossible to notice whether this
 444          * fflush invocation triggered such a case, therefore, we have to
 445          * catch all EINVAL errors whole-sale.
 446          */
 447         if (ret && errno == EINVAL)
 448                 errno = EPIPE;
 449
 450         return ret;
 451 }
 452
 453 /*
 454  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 455  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 456  */
 457 static inline long long filetime_to_hnsec(const FILETIME *ft)
 458 {
 459         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 460         /* Windows to Unix Epoch conversion */
 461         return winTime - 116444736000000000LL;
 462 }
 463
 464 static inline time_t filetime_to_time_t(const FILETIME *ft)
 465 {
 466         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 467 }
 468
 469 /* We keep the do_lstat code in a separate function to avoid recursion.
 470  * When a path ends with a slash, the stat will fail with ENOENT. In
 471  * this case, we strip the trailing slashes and stat again.
 472  *
 473  * If follow is true then act like stat() and report on the link
 474  * target. Otherwise report on the link itself.
 475  */
 476 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 477 {
 478         int err;
 479         WIN32_FILE_ATTRIBUTE_DATA fdata;
 480
 481         if (!(err = get_file_attr(file_name, &fdata))) {
 482                 buf->st_ino = 0;
 483                 buf->st_gid = 0;
 484                 buf->st_uid = 0;
 485                 buf->st_nlink = 1;
 486                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 487                 buf->st_size = fdata.nFileSizeLow |
 488                         (((off_t)fdata.nFileSizeHigh)<<32);
 489                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 490                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 491                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 492                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 493                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 494                         WIN32_FIND_DATAA findbuf;
 495                         HANDLE handle = FindFirstFileA(file_name, &findbuf);
 496                         if (handle != INVALID_HANDLE_VALUE) {
 497                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 498                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 499                                         if (follow) {
 500                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 501                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 502                                         } else {
 503                                                 buf->st_mode = S_IFLNK;
 504                                         }
 505                                         buf->st_mode |= S_IREAD;
 506                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 507                                                 buf->st_mode |= S_IWRITE;
 508                                 }
 509                                 FindClose(handle);
 510                         }
 511                 }
 512                 return 0;
 513         }
 514         errno = err;
 515         return -1;
 516 }
 517
 518 /* We provide our own lstat/fstat functions, since the provided
 519  * lstat/fstat functions are so slow. These stat functions are
 520  * tailored for Git's usage (read: fast), and are not meant to be
 521  * complete. Note that Git stat()s are redirected to mingw_lstat()
 522  * too, since Windows doesn't really handle symlinks that well.
 523  */
 524 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 525 {
 526         int namelen;
 527         static char alt_name[PATH_MAX];
 528
 529         if (!do_lstat(follow, file_name, buf))
 530                 return 0;
 531
 532         /* if file_name ended in a '/', Windows returned ENOENT;
 533          * try again without trailing slashes
 534          */
 535         if (errno != ENOENT)
 536                 return -1;
 537
 538         namelen = strlen(file_name);
 539         if (namelen && file_name[namelen-1] != '/')
 540                 return -1;
 541         while (namelen && file_name[namelen-1] == '/')
 542                 --namelen;
 543         if (!namelen || namelen >= PATH_MAX)
 544                 return -1;
 545
 546         memcpy(alt_name, file_name, namelen);
 547         alt_name[namelen] = 0;
 548         return do_lstat(follow, alt_name, buf);
 549 }
 550
 551 int mingw_lstat(const char *file_name, struct stat *buf)
 552 {
 553         return do_stat_internal(0, file_name, buf);
 554 }
 555 int mingw_stat(const char *file_name, struct stat *buf)
 556 {
 557         return do_stat_internal(1, file_name, buf);
 558 }
 559
 560 #undef fstat
 561 int mingw_fstat(int fd, struct stat *buf)
 562 {
 563         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 564         BY_HANDLE_FILE_INFORMATION fdata;
 565
 566         if (fh == INVALID_HANDLE_VALUE) {
 567                 errno = EBADF;
 568                 return -1;
 569         }
 570         /* direct non-file handles to MS's fstat() */
 571         if (GetFileType(fh) != FILE_TYPE_DISK)
 572                 return _fstati64(fd, buf);
 573
 574         if (GetFileInformationByHandle(fh, &fdata)) {
 575                 buf->st_ino = 0;
 576                 buf->st_gid = 0;
 577                 buf->st_uid = 0;
 578                 buf->st_nlink = 1;
 579                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 580                 buf->st_size = fdata.nFileSizeLow |
 581                         (((off_t)fdata.nFileSizeHigh)<<32);
 582                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 583                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 584                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 585                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 586                 return 0;
 587         }
 588         errno = EBADF;
 589         return -1;
 590 }
 591
 592 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 593 {
 594         long long winTime = t * 10000000LL + 116444736000000000LL;
 595         ft->dwLowDateTime = winTime;
 596         ft->dwHighDateTime = winTime >> 32;
 597 }
 598
 599 int mingw_utime (const char *file_name, const struct utimbuf *times)
 600 {
 601         FILETIME mft, aft;
 602         int fh, rc;
 603
 604         /* must have write permission */
 605         DWORD attrs = GetFileAttributes(file_name);
 606         if (attrs != INVALID_FILE_ATTRIBUTES &&
 607             (attrs & FILE_ATTRIBUTE_READONLY)) {
 608                 /* ignore errors here; open() will report them */
 609                 SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 610         }
 611
 612         if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 613                 rc = -1;
 614                 goto revert_attrs;
 615         }
 616
 617         if (times) {
 618                 time_t_to_filetime(times->modtime, &mft);
 619                 time_t_to_filetime(times->actime, &aft);
 620         } else {
 621                 GetSystemTimeAsFileTime(&mft);
 622                 aft = mft;
 623         }
 624         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 625                 errno = EINVAL;
 626                 rc = -1;
 627         } else
 628                 rc = 0;
 629         close(fh);
 630
 631 revert_attrs:
 632         if (attrs != INVALID_FILE_ATTRIBUTES &&
 633             (attrs & FILE_ATTRIBUTE_READONLY)) {
 634                 /* ignore errors again */
 635                 SetFileAttributes(file_name, attrs);
 636         }
 637         return rc;
 638 }
 639
 640 unsigned int sleep (unsigned int seconds)
 641 {
 642         Sleep(seconds*1000);
 643         return 0;
 644 }
 645
 646 int mkstemp(char *template)
 647 {
 648         char *filename = mktemp(template);
 649         if (filename == NULL)
 650                 return -1;
 651         return open(filename, O_RDWR | O_CREAT, 0600);
 652 }
 653
 654 int gettimeofday(struct timeval *tv, void *tz)
 655 {
 656         FILETIME ft;
 657         long long hnsec;
 658
 659         GetSystemTimeAsFileTime(&ft);
 660         hnsec = filetime_to_hnsec(&ft);
 661         tv->tv_sec = hnsec / 10000000;
 662         tv->tv_usec = (hnsec % 10000000) / 10;
 663         return 0;
 664 }
 665
 666 int pipe(int filedes[2])
 667 {
 668         HANDLE h[2];
 669
 670         /* this creates non-inheritable handles */
 671         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 672                 errno = err_win_to_posix(GetLastError());
 673                 return -1;
 674         }
 675         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 676         if (filedes[0] < 0) {
 677                 CloseHandle(h[0]);
 678                 CloseHandle(h[1]);
 679                 return -1;
 680         }
 681         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 682         if (filedes[0] < 0) {
 683                 close(filedes[0]);
 684                 CloseHandle(h[1]);
 685                 return -1;
 686         }
 687         return 0;
 688 }
 689
 690 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 691 {
 692         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 693         memcpy(result, gmtime(timep), sizeof(struct tm));
 694         return result;
 695 }
 696
 697 struct tm *localtime_r(const time_t *timep, struct tm *result)
 698 {
 699         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 700         memcpy(result, localtime(timep), sizeof(struct tm));
 701         return result;
 702 }
 703
 704 #undef getcwd
 705 char *mingw_getcwd(char *pointer, int len)
 706 {
 707         int i;
 708         char *ret = getcwd(pointer, len);
 709         if (!ret)
 710                 return ret;
 711         for (i = 0; pointer[i]; i++)
 712                 if (pointer[i] == '\\')
 713                         pointer[i] = '/';
 714         return ret;
 715 }
 716
 717 /*
 718  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 719  * (Parsing C++ Command-Line Arguments)
 720  */
 721 static const char *quote_arg(const char *arg)
 722 {
 723         /* count chars to quote */
 724         int len = 0, n = 0;
 725         int force_quotes = 0;
 726         char *q, *d;
 727         const char *p = arg;
 728         if (!*p) force_quotes = 1;
 729         while (*p) {
 730                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 731                         force_quotes = 1;
 732                 else if (*p == '"')
 733                         n++;
 734                 else if (*p == '\\') {
 735                         int count = 0;
 736                         while (*p == '\\') {
 737                                 count++;
 738                                 p++;
 739                                 len++;
 740                         }
 741                         if (*p == '"')
 742                                 n += count*2 + 1;
 743                         continue;
 744                 }
 745                 len++;
 746                 p++;
 747         }
 748         if (!force_quotes && n == 0)
 749                 return arg;
 750
 751         /* insert \ where necessary */
 752         d = q = xmalloc(len+n+3);
 753         *d++ = '"';
 754         while (*arg) {
 755                 if (*arg == '"')
 756                         *d++ = '\\';
 757                 else if (*arg == '\\') {
 758                         int count = 0;
 759                         while (*arg == '\\') {
 760                                 count++;
 761                                 *d++ = *arg++;
 762                         }
 763                         if (*arg == '"') {
 764                                 while (count-- > 0)
 765                                         *d++ = '\\';
 766                                 *d++ = '\\';
 767                         }
 768                 }
 769                 *d++ = *arg++;
 770         }
 771         *d++ = '"';
 772         *d++ = 0;
 773         return q;
 774 }
 775
 776 static const char *parse_interpreter(const char *cmd)
 777 {
 778         static char buf[100];
 779         char *p, *opt;
 780         int n, fd;
 781
 782         /* don't even try a .exe */
 783         n = strlen(cmd);
 784         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 785                 return NULL;
 786
 787         fd = open(cmd, O_RDONLY);
 788         if (fd < 0)
 789                 return NULL;
 790         n = read(fd, buf, sizeof(buf)-1);
 791         close(fd);
 792         if (n < 4)      /* at least '#!/x' and not error */
 793                 return NULL;
 794
 795         if (buf[0] != '#' || buf[1] != '!')
 796                 return NULL;
 797         buf[n] = '\0';
 798         p = buf + strcspn(buf, "\r\n");
 799         if (!*p)
 800                 return NULL;
 801
 802         *p = '\0';
 803         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 804                 return NULL;
 805         /* strip options */
 806         if ((opt = strchr(p+1, ' ')))
 807                 *opt = '\0';
 808         return p+1;
 809 }
 810
 811 /*
 812  * Splits the PATH into parts.
 813  */
 814 static char **get_path_split(void)
 815 {
 816         char *p, **path, *envpath = mingw_getenv("PATH");
 817         int i, n = 0;
 818
 819         if (!envpath || !*envpath)
 820                 return NULL;
 821
 822         envpath = xstrdup(envpath);
 823         p = envpath;
 824         while (p) {
 825                 char *dir = p;
 826                 p = strchr(p, ';');
 827                 if (p) *p++ = '\0';
 828                 if (*dir) {     /* not earlier, catches series of ; */
 829                         ++n;
 830                 }
 831         }
 832         if (!n)
 833                 return NULL;
 834
 835         path = xmalloc((n+1)*sizeof(char *));
 836         p = envpath;
 837         i = 0;
 838         do {
 839                 if (*p)
 840                         path[i++] = xstrdup(p);
 841                 p = p+strlen(p)+1;
 842         } while (i < n);
 843         path[i] = NULL;
 844
 845         free(envpath);
 846
 847         return path;
 848 }
 849
 850 static void free_path_split(char **path)
 851 {
 852         char **p = path;
 853
 854         if (!path)
 855                 return;
 856
 857         while (*p)
 858                 free(*p++);
 859         free(path);
 860 }
 861
 862 /*
 863  * exe_only means that we only want to detect .exe files, but not scripts
 864  * (which do not have an extension)
 865  */
 866 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 867 {
 868         char path[MAX_PATH];
 869         snprintf(path, sizeof(path), "%s\\%s.exe", dir, cmd);
 870
 871         if (!isexe && access(path, F_OK) == 0)
 872                 return xstrdup(path);
 873         path[strlen(path)-4] = '\0';
 874         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 875                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 876                         return xstrdup(path);
 877         return NULL;
 878 }
 879
 880 /*
 881  * Determines the absolute path of cmd using the split path in path.
 882  * If cmd contains a slash or backslash, no lookup is performed.
 883  */
 884 static char *path_lookup(const char *cmd, char **path, int exe_only)
 885 {
 886         char *prog = NULL;
 887         int len = strlen(cmd);
 888         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 889
 890         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 891                 prog = xstrdup(cmd);
 892
 893         while (!prog && *path)
 894                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 895
 896         return prog;
 897 }
 898
 899 static int env_compare(const void *a, const void *b)
 900 {
 901         char *const *ea = a;
 902         char *const *eb = b;
 903         return strcasecmp(*ea, *eb);
 904 }
 905
 906 struct pinfo_t {
 907         struct pinfo_t *next;
 908         pid_t pid;
 909         HANDLE proc;
 910 } pinfo_t;
 911 struct pinfo_t *pinfo = NULL;
 912 CRITICAL_SECTION pinfo_cs;
 913
 914 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 915                               const char *dir,
 916                               int prepend_cmd, int fhin, int fhout, int fherr)
 917 {
 918         STARTUPINFO si;
 919         PROCESS_INFORMATION pi;
 920         struct strbuf envblk, args;
 921         unsigned flags;
 922         BOOL ret;
 923
 924         /* Determine whether or not we are associated to a console */
 925         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 926                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 927                         FILE_ATTRIBUTE_NORMAL, NULL);
 928         if (cons == INVALID_HANDLE_VALUE) {
 929                 /* There is no console associated with this process.
 930                  * Since the child is a console process, Windows
 931                  * would normally create a console window. But
 932                  * since we'll be redirecting std streams, we do
 933                  * not need the console.
 934                  * It is necessary to use DETACHED_PROCESS
 935                  * instead of CREATE_NO_WINDOW to make ssh
 936                  * recognize that it has no console.
 937                  */
 938                 flags = DETACHED_PROCESS;
 939         } else {
 940                 /* There is already a console. If we specified
 941                  * DETACHED_PROCESS here, too, Windows would
 942                  * disassociate the child from the console.
 943                  * The same is true for CREATE_NO_WINDOW.
 944                  * Go figure!
 945                  */
 946                 flags = 0;
 947                 CloseHandle(cons);
 948         }
 949         memset(&si, 0, sizeof(si));
 950         si.cb = sizeof(si);
 951         si.dwFlags = STARTF_USESTDHANDLES;
 952         si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 953         si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 954         si.hStdError = (HANDLE) _get_osfhandle(fherr);
 955
 956         /* concatenate argv, quoting args as we go */
 957         strbuf_init(&args, 0);
 958         if (prepend_cmd) {
 959                 char *quoted = (char *)quote_arg(cmd);
 960                 strbuf_addstr(&args, quoted);
 961                 if (quoted != cmd)
 962                         free(quoted);
 963         }
 964         for (; *argv; argv++) {
 965                 char *quoted = (char *)quote_arg(*argv);
 966                 if (*args.buf)
 967                         strbuf_addch(&args, ' ');
 968                 strbuf_addstr(&args, quoted);
 969                 if (quoted != *argv)
 970                         free(quoted);
 971         }
 972
 973         if (env) {
 974                 int count = 0;
 975                 char **e, **sorted_env;
 976
 977                 for (e = env; *e; e++)
 978                         count++;
 979
 980                 /* environment must be sorted */
 981                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 982                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 983                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 984
 985                 strbuf_init(&envblk, 0);
 986                 for (e = sorted_env; *e; e++) {
 987                         strbuf_addstr(&envblk, *e);
 988                         strbuf_addch(&envblk, '\0');
 989                 }
 990                 free(sorted_env);
 991         }
 992
 993         memset(&pi, 0, sizeof(pi));
 994         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 995                 env ? envblk.buf : NULL, dir, &si, &pi);
 996
 997         if (env)
 998                 strbuf_release(&envblk);
 999         strbuf_release(&args);
1000
1001         if (!ret) {
1002                 errno = ENOENT;
1003                 return -1;
1004         }
1005         CloseHandle(pi.hThread);
1006
1007         /*
1008          * The process ID is the human-readable identifier of the process
1009          * that we want to present in log and error messages. The handle
1010          * is not useful for this purpose. But we cannot close it, either,
1011          * because it is not possible to turn a process ID into a process
1012          * handle after the process terminated.
1013          * Keep the handle in a list for waitpid.
1014          */
1015         EnterCriticalSection(&pinfo_cs);
1016         {
1017                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
1018                 info->pid = pi.dwProcessId;
1019                 info->proc = pi.hProcess;
1020                 info->next = pinfo;
1021                 pinfo = info;
1022         }
1023         LeaveCriticalSection(&pinfo_cs);
1024
1025         return (pid_t)pi.dwProcessId;
1026 }
1027
1028 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
1029                            int prepend_cmd)
1030 {
1031         return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
1032 }
1033
1034 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
1035                      const char *dir,
1036                      int fhin, int fhout, int fherr)
1037 {
1038         pid_t pid;
1039         char **path = get_path_split();
1040         char *prog = path_lookup(cmd, path, 0);
1041
1042         if (!prog) {
1043                 errno = ENOENT;
1044                 pid = -1;
1045         }
1046         else {
1047                 const char *interpr = parse_interpreter(prog);
1048
1049                 if (interpr) {
1050                         const char *argv0 = argv[0];
1051                         char *iprog = path_lookup(interpr, path, 1);
1052                         argv[0] = prog;
1053                         if (!iprog) {
1054                                 errno = ENOENT;
1055                                 pid = -1;
1056                         }
1057                         else {
1058                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
1059                                                        fhin, fhout, fherr);
1060                                 free(iprog);
1061                         }
1062                         argv[0] = argv0;
1063                 }
1064                 else
1065                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
1066                                                fhin, fhout, fherr);
1067                 free(prog);
1068         }
1069         free_path_split(path);
1070         return pid;
1071 }
1072
1073 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
1074 {
1075         const char *interpr = parse_interpreter(cmd);
1076         char **path;
1077         char *prog;
1078         int pid = 0;
1079
1080         if (!interpr)
1081                 return 0;
1082         path = get_path_split();
1083         prog = path_lookup(interpr, path, 1);
1084         if (prog) {
1085                 int argc = 0;
1086                 const char **argv2;
1087                 while (argv[argc]) argc++;
1088                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
1089                 argv2[0] = (char *)cmd; /* full path to the script file */
1090                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1091                 pid = mingw_spawnve(prog, argv2, env, 1);
1092                 if (pid >= 0) {
1093                         int status;
1094                         if (waitpid(pid, &status, 0) < 0)
1095                                 status = 255;
1096                         exit(status);
1097                 }
1098                 pid = 1;        /* indicate that we tried but failed */
1099                 free(prog);
1100                 free(argv2);
1101         }
1102         free_path_split(path);
1103         return pid;
1104 }
1105
1106 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
1107 {
1108         /* check if git_command is a shell script */
1109         if (!try_shell_exec(cmd, argv, (char **)env)) {
1110                 int pid, status;
1111
1112                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
1113                 if (pid < 0)
1114                         return;
1115                 if (waitpid(pid, &status, 0) < 0)
1116                         status = 255;
1117                 exit(status);
1118         }
1119 }
1120
1121 int mingw_execvp(const char *cmd, char *const *argv)
1122 {
1123         char **path = get_path_split();
1124         char *prog = path_lookup(cmd, path, 0);
1125
1126         if (prog) {
1127                 mingw_execve(prog, argv, environ);
1128                 free(prog);
1129         } else
1130                 errno = ENOENT;
1131
1132         free_path_split(path);
1133         return -1;
1134 }
1135
1136 int mingw_execv(const char *cmd, char *const *argv)
1137 {
1138         mingw_execve(cmd, argv, environ);
1139         return -1;
1140 }
1141
1142 int mingw_kill(pid_t pid, int sig)
1143 {
1144         if (pid > 0 && sig == SIGTERM) {
1145                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1146
1147                 if (TerminateProcess(h, -1)) {
1148                         CloseHandle(h);
1149                         return 0;
1150                 }
1151
1152                 errno = err_win_to_posix(GetLastError());
1153                 CloseHandle(h);
1154                 return -1;
1155         }
1156
1157         errno = EINVAL;
1158         return -1;
1159 }
1160
1161 static char **copy_environ(void)
1162 {
1163         char **env;
1164         int i = 0;
1165         while (environ[i])
1166                 i++;
1167         env = xmalloc((i+1)*sizeof(*env));
1168         for (i = 0; environ[i]; i++)
1169                 env[i] = xstrdup(environ[i]);
1170         env[i] = NULL;
1171         return env;
1172 }
1173
1174 void free_environ(char **env)
1175 {
1176         int i;
1177         for (i = 0; env[i]; i++)
1178                 free(env[i]);
1179         free(env);
1180 }
1181
1182 static int lookup_env(char **env, const char *name, size_t nmln)
1183 {
1184         int i;
1185
1186         for (i = 0; env[i]; i++) {
1187                 if (0 == strncmp(env[i], name, nmln)
1188                     && '=' == env[i][nmln])
1189                         /* matches */
1190                         return i;
1191         }
1192         return -1;
1193 }
1194
1195 /*
1196  * If name contains '=', then sets the variable, otherwise it unsets it
1197  */
1198 static char **env_setenv(char **env, const char *name)
1199 {
1200         char *eq = strchrnul(name, '=');
1201         int i = lookup_env(env, name, eq-name);
1202
1203         if (i < 0) {
1204                 if (*eq) {
1205                         for (i = 0; env[i]; i++)
1206                                 ;
1207                         env = xrealloc(env, (i+2)*sizeof(*env));
1208                         env[i] = xstrdup(name);
1209                         env[i+1] = NULL;
1210                 }
1211         }
1212         else {
1213                 free(env[i]);
1214                 if (*eq)
1215                         env[i] = xstrdup(name);
1216                 else
1217                         for (; env[i]; i++)
1218                                 env[i] = env[i+1];
1219         }
1220         return env;
1221 }
1222
1223 /*
1224  * Copies global environ and adjusts variables as specified by vars.
1225  */
1226 char **make_augmented_environ(const char *const *vars)
1227 {
1228         char **env = copy_environ();
1229
1230         while (*vars)
1231                 env = env_setenv(env, *vars++);
1232         return env;
1233 }
1234
1235 #undef getenv
1236
1237 /*
1238  * The system's getenv looks up the name in a case-insensitive manner.
1239  * This version tries a case-sensitive lookup and falls back to
1240  * case-insensitive if nothing was found.  This is necessary because,
1241  * as a prominent example, CMD sets 'Path', but not 'PATH'.
1242  * Warning: not thread-safe.
1243  */
1244 static char *getenv_cs(const char *name)
1245 {
1246         size_t len = strlen(name);
1247         int i = lookup_env(environ, name, len);
1248         if (i >= 0)
1249                 return environ[i] + len + 1;    /* skip past name and '=' */
1250         return getenv(name);
1251 }
1252
1253 char *mingw_getenv(const char *name)
1254 {
1255         char *result = getenv_cs(name);
1256         if (!result && !strcmp(name, "TMPDIR")) {
1257                 /* on Windows it is TMP and TEMP */
1258                 result = getenv_cs("TMP");
1259                 if (!result)
1260                         result = getenv_cs("TEMP");
1261         }
1262         return result;
1263 }
1264
1265 /*
1266  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1267  * that service contains a numerical port, or that it is null. It
1268  * does a simple search using gethostbyname, and returns one IPv4 host
1269  * if one was found.
1270  */
1271 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1272                                    const struct addrinfo *hints,
1273                                    struct addrinfo **res)
1274 {
1275         struct hostent *h = NULL;
1276         struct addrinfo *ai;
1277         struct sockaddr_in *sin;
1278
1279         if (node) {
1280                 h = gethostbyname(node);
1281                 if (!h)
1282                         return WSAGetLastError();
1283         }
1284
1285         ai = xmalloc(sizeof(struct addrinfo));
1286         *res = ai;
1287         ai->ai_flags = 0;
1288         ai->ai_family = AF_INET;
1289         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1290         switch (ai->ai_socktype) {
1291         case SOCK_STREAM:
1292                 ai->ai_protocol = IPPROTO_TCP;
1293                 break;
1294         case SOCK_DGRAM:
1295                 ai->ai_protocol = IPPROTO_UDP;
1296                 break;
1297         default:
1298                 ai->ai_protocol = 0;
1299                 break;
1300         }
1301         ai->ai_addrlen = sizeof(struct sockaddr_in);
1302         if (hints && (hints->ai_flags & AI_CANONNAME))
1303                 ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1304         else
1305                 ai->ai_canonname = NULL;
1306
1307         sin = xmalloc(ai->ai_addrlen);
1308         memset(sin, 0, ai->ai_addrlen);
1309         sin->sin_family = AF_INET;
1310         /* Note: getaddrinfo is supposed to allow service to be a string,
1311          * which should be looked up using getservbyname. This is
1312          * currently not implemented */
1313         if (service)
1314                 sin->sin_port = htons(atoi(service));
1315         if (h)
1316                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1317         else if (hints && (hints->ai_flags & AI_PASSIVE))
1318                 sin->sin_addr.s_addr = INADDR_ANY;
1319         else
1320                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1321         ai->ai_addr = (struct sockaddr *)sin;
1322         ai->ai_next = 0;
1323         return 0;
1324 }
1325
1326 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1327 {
1328         free(res->ai_canonname);
1329         free(res->ai_addr);
1330         free(res);
1331 }
1332
1333 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1334                                    char *host, DWORD hostlen,
1335                                    char *serv, DWORD servlen, int flags)
1336 {
1337         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1338         if (sa->sa_family != AF_INET)
1339                 return EAI_FAMILY;
1340         if (!host && !serv)
1341                 return EAI_NONAME;
1342
1343         if (host && hostlen > 0) {
1344                 struct hostent *ent = NULL;
1345                 if (!(flags & NI_NUMERICHOST))
1346                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1347                                             sizeof(sin->sin_addr), AF_INET);
1348
1349                 if (ent)
1350                         snprintf(host, hostlen, "%s", ent->h_name);
1351                 else if (flags & NI_NAMEREQD)
1352                         return EAI_NONAME;
1353                 else
1354                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1355         }
1356
1357         if (serv && servlen > 0) {
1358                 struct servent *ent = NULL;
1359                 if (!(flags & NI_NUMERICSERV))
1360                         ent = getservbyport(sin->sin_port,
1361                                             flags & NI_DGRAM ? "udp" : "tcp");
1362
1363                 if (ent)
1364                         snprintf(serv, servlen, "%s", ent->s_name);
1365                 else
1366                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1367         }
1368
1369         return 0;
1370 }
1371
1372 static HMODULE ipv6_dll = NULL;
1373 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1374 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1375                                       const struct addrinfo *hints,
1376                                       struct addrinfo **res);
1377 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1378                                       char *host, DWORD hostlen,
1379                                       char *serv, DWORD servlen, int flags);
1380 /*
1381  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1382  * don't need to try to load that one dynamically.
1383  */
1384
1385 static void socket_cleanup(void)
1386 {
1387         WSACleanup();
1388         if (ipv6_dll)
1389                 FreeLibrary(ipv6_dll);
1390         ipv6_dll = NULL;
1391         ipv6_freeaddrinfo = freeaddrinfo_stub;
1392         ipv6_getaddrinfo = getaddrinfo_stub;
1393         ipv6_getnameinfo = getnameinfo_stub;
1394 }
1395
1396 static void ensure_socket_initialization(void)
1397 {
1398         WSADATA wsa;
1399         static int initialized = 0;
1400         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1401         const char **name;
1402
1403         if (initialized)
1404                 return;
1405
1406         if (WSAStartup(MAKEWORD(2,2), &wsa))
1407                 die("unable to initialize winsock subsystem, error %d",
1408                         WSAGetLastError());
1409
1410         for (name = libraries; *name; name++) {
1411                 ipv6_dll = LoadLibrary(*name);
1412                 if (!ipv6_dll)
1413                         continue;
1414
1415                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1416                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1417                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1418                                                    const struct addrinfo *,
1419                                                    struct addrinfo **))
1420                         GetProcAddress(ipv6_dll, "getaddrinfo");
1421                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1422                                                    socklen_t, char *, DWORD,
1423                                                    char *, DWORD, int))
1424                         GetProcAddress(ipv6_dll, "getnameinfo");
1425                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1426                         FreeLibrary(ipv6_dll);
1427                         ipv6_dll = NULL;
1428                 } else
1429                         break;
1430         }
1431         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1432                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1433                 ipv6_getaddrinfo = getaddrinfo_stub;
1434                 ipv6_getnameinfo = getnameinfo_stub;
1435         }
1436
1437         atexit(socket_cleanup);
1438         initialized = 1;
1439 }
1440
1441 #undef gethostname
1442 int mingw_gethostname(char *name, int namelen)
1443 {
1444     ensure_socket_initialization();
1445     return gethostname(name, namelen);
1446 }
1447
1448 #undef gethostbyname
1449 struct hostent *mingw_gethostbyname(const char *host)
1450 {
1451         ensure_socket_initialization();
1452         return gethostbyname(host);
1453 }
1454
1455 void mingw_freeaddrinfo(struct addrinfo *res)
1456 {
1457         ipv6_freeaddrinfo(res);
1458 }
1459
1460 int mingw_getaddrinfo(const char *node, const char *service,
1461                       const struct addrinfo *hints, struct addrinfo **res)
1462 {
1463         ensure_socket_initialization();
1464         return ipv6_getaddrinfo(node, service, hints, res);
1465 }
1466
1467 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1468                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1469                       int flags)
1470 {
1471         ensure_socket_initialization();
1472         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1473 }
1474
1475 int mingw_socket(int domain, int type, int protocol)
1476 {
1477         int sockfd;
1478         SOCKET s;
1479
1480         ensure_socket_initialization();
1481         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1482         if (s == INVALID_SOCKET) {
1483                 /*
1484                  * WSAGetLastError() values are regular BSD error codes
1485                  * biased by WSABASEERR.
1486                  * However, strerror() does not know about networking
1487                  * specific errors, which are values beginning at 38 or so.
1488                  * Therefore, we choose to leave the biased error code
1489                  * in errno so that _if_ someone looks up the code somewhere,
1490                  * then it is at least the number that are usually listed.
1491                  */
1492                 errno = WSAGetLastError();
1493                 return -1;
1494         }
1495         /* convert into a file descriptor */
1496         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1497                 closesocket(s);
1498                 return error("unable to make a socket file descriptor: %s",
1499                         strerror(errno));
1500         }
1501         return sockfd;
1502 }
1503
1504 #undef connect
1505 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1506 {
1507         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1508         return connect(s, sa, sz);
1509 }
1510
1511 #undef bind
1512 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1513 {
1514         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1515         return bind(s, sa, sz);
1516 }
1517
1518 #undef setsockopt
1519 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1520 {
1521         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1522         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1523 }
1524
1525 #undef shutdown
1526 int mingw_shutdown(int sockfd, int how)
1527 {
1528         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1529         return shutdown(s, how);
1530 }
1531
1532 #undef listen
1533 int mingw_listen(int sockfd, int backlog)
1534 {
1535         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1536         return listen(s, backlog);
1537 }
1538
1539 #undef accept
1540 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1541 {
1542         int sockfd2;
1543
1544         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1545         SOCKET s2 = accept(s1, sa, sz);
1546
1547         /* convert into a file descriptor */
1548         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1549                 int err = errno;
1550                 closesocket(s2);
1551                 return error("unable to make a socket file descriptor: %s",
1552                         strerror(err));
1553         }
1554         return sockfd2;
1555 }
1556
1557 #undef rename
1558 int mingw_rename(const char *pold, const char *pnew)
1559 {
1560         DWORD attrs, gle;
1561         int tries = 0;
1562
1563         /*
1564          * Try native rename() first to get errno right.
1565          * It is based on MoveFile(), which cannot overwrite existing files.
1566          */
1567         if (!rename(pold, pnew))
1568                 return 0;
1569         if (errno != EEXIST)
1570                 return -1;
1571 repeat:
1572         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1573                 return 0;
1574         /* TODO: translate more errors */
1575         gle = GetLastError();
1576         if (gle == ERROR_ACCESS_DENIED &&
1577             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1578                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1579                         errno = EISDIR;
1580                         return -1;
1581                 }
1582                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1583                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1584                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1585                                 return 0;
1586                         gle = GetLastError();
1587                         /* revert file attributes on failure */
1588                         SetFileAttributes(pnew, attrs);
1589                 }
1590         }
1591         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1592                 /*
1593                  * We assume that some other process had the source or
1594                  * destination file open at the wrong moment and retry.
1595                  * In order to give the other process a higher chance to
1596                  * complete its operation, we give up our time slice now.
1597                  * If we have to retry again, we do sleep a bit.
1598                  */
1599                 Sleep(delay[tries]);
1600                 tries++;
1601                 goto repeat;
1602         }
1603         if (gle == ERROR_ACCESS_DENIED &&
1604                ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1605                        "Should I try again?", pold, pnew))
1606                 goto repeat;
1607
1608         errno = EACCES;
1609         return -1;
1610 }
1611
1612 /*
1613  * Note that this doesn't return the actual pagesize, but
1614  * the allocation granularity. If future Windows specific git code
1615  * needs the real getpagesize function, we need to find another solution.
1616  */
1617 int mingw_getpagesize(void)
1618 {
1619         SYSTEM_INFO si;
1620         GetSystemInfo(&si);
1621         return si.dwAllocationGranularity;
1622 }
1623
1624 struct passwd *getpwuid(int uid)
1625 {
1626         static char user_name[100];
1627         static struct passwd p;
1628
1629         DWORD len = sizeof(user_name);
1630         if (!GetUserName(user_name, &len))
1631                 return NULL;
1632         p.pw_name = user_name;
1633         p.pw_gecos = "unknown";
1634         p.pw_dir = NULL;
1635         return &p;
1636 }
1637
1638 static HANDLE timer_event;
1639 static HANDLE timer_thread;
1640 static int timer_interval;
1641 static int one_shot;
1642 static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1643
1644 /* The timer works like this:
1645  * The thread, ticktack(), is a trivial routine that most of the time
1646  * only waits to receive the signal to terminate. The main thread tells
1647  * the thread to terminate by setting the timer_event to the signalled
1648  * state.
1649  * But ticktack() interrupts the wait state after the timer's interval
1650  * length to call the signal handler.
1651  */
1652
1653 static unsigned __stdcall ticktack(void *dummy)
1654 {
1655         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1656                 mingw_raise(SIGALRM);
1657                 if (one_shot)
1658                         break;
1659         }
1660         return 0;
1661 }
1662
1663 static int start_timer_thread(void)
1664 {
1665         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1666         if (timer_event) {
1667                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1668                 if (!timer_thread )
1669                         return errno = ENOMEM,
1670                                 error("cannot start timer thread");
1671         } else
1672                 return errno = ENOMEM,
1673                         error("cannot allocate resources for timer");
1674         return 0;
1675 }
1676
1677 static void stop_timer_thread(void)
1678 {
1679         if (timer_event)
1680                 SetEvent(timer_event);  /* tell thread to terminate */
1681         if (timer_thread) {
1682                 int rc = WaitForSingleObject(timer_thread, 1000);
1683                 if (rc == WAIT_TIMEOUT)
1684                         error("timer thread did not terminate timely");
1685                 else if (rc != WAIT_OBJECT_0)
1686                         error("waiting for timer thread failed: %lu",
1687                               GetLastError());
1688                 CloseHandle(timer_thread);
1689         }
1690         if (timer_event)
1691                 CloseHandle(timer_event);
1692         timer_event = NULL;
1693         timer_thread = NULL;
1694 }
1695
1696 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1697 {
1698         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1699 }
1700
1701 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1702 {
1703         static const struct timeval zero;
1704         static int atexit_done;
1705
1706         if (out != NULL)
1707                 return errno = EINVAL,
1708                         error("setitimer param 3 != NULL not implemented");
1709         if (!is_timeval_eq(&in->it_interval, &zero) &&
1710             !is_timeval_eq(&in->it_interval, &in->it_value))
1711                 return errno = EINVAL,
1712                         error("setitimer: it_interval must be zero or eq it_value");
1713
1714         if (timer_thread)
1715                 stop_timer_thread();
1716
1717         if (is_timeval_eq(&in->it_value, &zero) &&
1718             is_timeval_eq(&in->it_interval, &zero))
1719                 return 0;
1720
1721         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1722         one_shot = is_timeval_eq(&in->it_interval, &zero);
1723         if (!atexit_done) {
1724                 atexit(stop_timer_thread);
1725                 atexit_done = 1;
1726         }
1727         return start_timer_thread();
1728 }
1729
1730 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1731 {
1732         if (sig != SIGALRM)
1733                 return errno = EINVAL,
1734                         error("sigaction only implemented for SIGALRM");
1735         if (out != NULL)
1736                 return errno = EINVAL,
1737                         error("sigaction: param 3 != NULL not implemented");
1738
1739         timer_fn = in->sa_handler;
1740         return 0;
1741 }
1742
1743 #undef signal
1744 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1745 {
1746         sig_handler_t old = timer_fn;
1747
1748         switch (sig) {
1749         case SIGALRM:
1750                 timer_fn = handler;
1751                 break;
1752
1753         case SIGINT:
1754                 sigint_fn = handler;
1755                 break;
1756
1757         default:
1758                 return signal(sig, handler);
1759         }
1760
1761         return old;
1762 }
1763
1764 #undef raise
1765 int mingw_raise(int sig)
1766 {
1767         switch (sig) {
1768         case SIGALRM:
1769                 if (timer_fn == SIG_DFL) {
1770                         if (isatty(STDERR_FILENO))
1771                                 fputs("Alarm clock\n", stderr);
1772                         exit(128 + SIGALRM);
1773                 } else if (timer_fn != SIG_IGN)
1774                         timer_fn(SIGALRM);
1775                 return 0;
1776
1777         case SIGINT:
1778                 if (sigint_fn == SIG_DFL)
1779                         exit(128 + SIGINT);
1780                 else if (sigint_fn != SIG_IGN)
1781                         sigint_fn(SIGINT);
1782                 return 0;
1783
1784         default:
1785                 return raise(sig);
1786         }
1787 }
1788
1789
1790 static const char *make_backslash_path(const char *path)
1791 {
1792         static char buf[PATH_MAX + 1];
1793         char *c;
1794
1795         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1796                 die("Too long path: %.*s", 60, path);
1797
1798         for (c = buf; *c; c++) {
1799                 if (*c == '/')
1800                         *c = '\\';
1801         }
1802         return buf;
1803 }
1804
1805 void mingw_open_html(const char *unixpath)
1806 {
1807         const char *htmlpath = make_backslash_path(unixpath);
1808         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1809                         const char *, const char *, const char *, INT);
1810         T ShellExecute;
1811         HMODULE shell32;
1812         int r;
1813
1814         shell32 = LoadLibrary("shell32.dll");
1815         if (!shell32)
1816                 die("cannot load shell32.dll");
1817         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1818         if (!ShellExecute)
1819                 die("cannot run browser");
1820
1821         printf("Launching default browser to display HTML ...\n");
1822         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1823         FreeLibrary(shell32);
1824         /* see the MSDN documentation referring to the result codes here */
1825         if (r <= 32) {
1826                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1827         }
1828 }
1829
1830 int link(const char *oldpath, const char *newpath)
1831 {
1832         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1833         static T create_hard_link = NULL;
1834         if (!create_hard_link) {
1835                 create_hard_link = (T) GetProcAddress(
1836                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1837                 if (!create_hard_link)
1838                         create_hard_link = (T)-1;
1839         }
1840         if (create_hard_link == (T)-1) {
1841                 errno = ENOSYS;
1842                 return -1;
1843         }
1844         if (!create_hard_link(newpath, oldpath, NULL)) {
1845                 errno = err_win_to_posix(GetLastError());
1846                 return -1;
1847         }
1848         return 0;
1849 }
1850
1851 pid_t waitpid(pid_t pid, int *status, int options)
1852 {
1853         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1854             FALSE, pid);
1855         if (!h) {
1856                 errno = ECHILD;
1857                 return -1;
1858         }
1859
1860         if (pid > 0 && options & WNOHANG) {
1861                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1862                         CloseHandle(h);
1863                         return 0;
1864                 }
1865                 options &= ~WNOHANG;
1866         }
1867
1868         if (options == 0) {
1869                 struct pinfo_t **ppinfo;
1870                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1871                         CloseHandle(h);
1872                         return 0;
1873                 }
1874
1875                 if (status)
1876                         GetExitCodeProcess(h, (LPDWORD)status);
1877
1878                 EnterCriticalSection(&pinfo_cs);
1879
1880                 ppinfo = &pinfo;
1881                 while (*ppinfo) {
1882                         struct pinfo_t *info = *ppinfo;
1883                         if (info->pid == pid) {
1884                                 CloseHandle(info->proc);
1885                                 *ppinfo = info->next;
1886                                 free(info);
1887                                 break;
1888                         }
1889                         ppinfo = &info->next;
1890                 }
1891
1892                 LeaveCriticalSection(&pinfo_cs);
1893
1894                 CloseHandle(h);
1895                 return pid;
1896         }
1897         CloseHandle(h);
1898
1899         errno = EINVAL;
1900         return -1;
1901 }
1902
1903 const char *get_windows_home_directory(void)
1904 {
1905         static const char *home_directory = NULL;
1906         struct strbuf buf = STRBUF_INIT;
1907
1908         if (home_directory)
1909                 return home_directory;
1910
1911         home_directory = getenv("HOME");
1912         if (home_directory && *home_directory)
1913                 return home_directory;
1914
1915         strbuf_addf(&buf, "%s/%s", getenv("HOMEDRIVE"), getenv("HOMEPATH"));
1916         home_directory = strbuf_detach(&buf, NULL);
1917
1918         return home_directory;
1919 }
1920
1921 int mingw_offset_1st_component(const char *path)
1922 {
1923         int offset = 0;
1924         if (has_dos_drive_prefix(path))
1925                 offset = 2;
1926
1927         /* unc paths */
1928         else if (is_dir_sep(path[0]) && is_dir_sep(path[1])) {
1929
1930                 /* skip server name */
1931                 char *pos = strpbrk(path + 2, "\\/");
1932                 if (!pos)
1933                         return 0; /* Error: malformed unc path */
1934
1935                 do {
1936                         pos++;
1937                 } while (*pos && !is_dir_sep(*pos));
1938
1939                 offset = pos - path;
1940         }
1941
1942         return offset + is_dir_sep(path[offset]);
1943 }