compat/mingw.c

   1 #include "../git-compat-util.h"
   2 #include "../strbuf.h"
   3
   4 unsigned int _CRT_fmode = _O_BINARY;
   5
   6 #undef open
   7 int mingw_open (const char *filename, int oflags, ...)
   8 {
   9         va_list args;
  10         unsigned mode;
  11         va_start(args, oflags);
  12         mode = va_arg(args, int);
  13         va_end(args);
  14
  15         if (!strcmp(filename, "/dev/null"))
  16                 filename = "nul";
  17         int fd = open(filename, oflags, mode);
  18         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
  19                 DWORD attrs = GetFileAttributes(filename);
  20                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
  21                         errno = EISDIR;
  22         }
  23         return fd;
  24 }
  25
  26 static inline time_t filetime_to_time_t(const FILETIME *ft)
  27 {
  28         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
  29         winTime -= 116444736000000000LL; /* Windows to Unix Epoch conversion */
  30         winTime /= 10000000;             /* Nano to seconds resolution */
  31         return (time_t)winTime;
  32 }
  33
  34 static inline size_t size_to_blocks(size_t s)
  35 {
  36         return (s+511)/512;
  37 }
  38
  39 extern int _getdrive( void );
  40 /* We keep the do_lstat code in a separate function to avoid recursion.
  41  * When a path ends with a slash, the stat will fail with ENOENT. In
  42  * this case, we strip the trailing slashes and stat again.
  43  */
  44 static int do_lstat(const char *file_name, struct stat *buf)
  45 {
  46         WIN32_FILE_ATTRIBUTE_DATA fdata;
  47
  48         if (GetFileAttributesExA(file_name, GetFileExInfoStandard, &fdata)) {
  49                 int fMode = S_IREAD;
  50                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
  51                         fMode |= S_IFDIR;
  52                 else
  53                         fMode |= S_IFREG;
  54                 if (!(fdata.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
  55                         fMode |= S_IWRITE;
  56
  57                 buf->st_ino = 0;
  58                 buf->st_gid = 0;
  59                 buf->st_uid = 0;
  60                 buf->st_mode = fMode;
  61                 buf->st_size = fdata.nFileSizeLow; /* Can't use nFileSizeHigh, since it's not a stat64 */
  62                 buf->st_blocks = size_to_blocks(buf->st_size);
  63                 buf->st_dev = _getdrive() - 1;
  64                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
  65                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
  66                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
  67                 errno = 0;
  68                 return 0;
  69         }
  70
  71         switch (GetLastError()) {
  72         case ERROR_ACCESS_DENIED:
  73         case ERROR_SHARING_VIOLATION:
  74         case ERROR_LOCK_VIOLATION:
  75         case ERROR_SHARING_BUFFER_EXCEEDED:
  76                 errno = EACCES;
  77                 break;
  78         case ERROR_BUFFER_OVERFLOW:
  79                 errno = ENAMETOOLONG;
  80                 break;
  81         case ERROR_NOT_ENOUGH_MEMORY:
  82                 errno = ENOMEM;
  83                 break;
  84         default:
  85                 errno = ENOENT;
  86                 break;
  87         }
  88         return -1;
  89 }
  90
  91 /* We provide our own lstat/fstat functions, since the provided
  92  * lstat/fstat functions are so slow. These stat functions are
  93  * tailored for Git's usage (read: fast), and are not meant to be
  94  * complete. Note that Git stat()s are redirected to mingw_lstat()
  95  * too, since Windows doesn't really handle symlinks that well.
  96  */
  97 int mingw_lstat(const char *file_name, struct mingw_stat *buf)
  98 {
  99         int namelen;
 100         static char alt_name[PATH_MAX];
 101
 102         if (!do_lstat(file_name, buf))
 103                 return 0;
 104
 105         /* if file_name ended in a '/', Windows returned ENOENT;
 106          * try again without trailing slashes
 107          */
 108         if (errno != ENOENT)
 109                 return -1;
 110
 111         namelen = strlen(file_name);
 112         if (namelen && file_name[namelen-1] != '/')
 113                 return -1;
 114         while (namelen && file_name[namelen-1] == '/')
 115                 --namelen;
 116         if (!namelen || namelen >= PATH_MAX)
 117                 return -1;
 118
 119         memcpy(alt_name, file_name, namelen);
 120         alt_name[namelen] = 0;
 121         return do_lstat(alt_name, buf);
 122 }
 123
 124 #undef fstat
 125 #undef stat
 126 int mingw_fstat(int fd, struct mingw_stat *buf)
 127 {
 128         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 129         BY_HANDLE_FILE_INFORMATION fdata;
 130
 131         if (fh == INVALID_HANDLE_VALUE) {
 132                 errno = EBADF;
 133                 return -1;
 134         }
 135         /* direct non-file handles to MS's fstat() */
 136         if (GetFileType(fh) != FILE_TYPE_DISK) {
 137                 struct stat st;
 138                 if (fstat(fd, &st))
 139                         return -1;
 140                 buf->st_ino = st.st_ino;
 141                 buf->st_gid = st.st_gid;
 142                 buf->st_uid = st.st_uid;
 143                 buf->st_mode = st.st_mode;
 144                 buf->st_size = st.st_size;
 145                 buf->st_blocks = size_to_blocks(buf->st_size);
 146                 buf->st_dev = st.st_dev;
 147                 buf->st_atime = st.st_atime;
 148                 buf->st_mtime = st.st_mtime;
 149                 buf->st_ctime = st.st_ctime;
 150                 return 0;
 151         }
 152
 153         if (GetFileInformationByHandle(fh, &fdata)) {
 154                 int fMode = S_IREAD;
 155                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
 156                         fMode |= S_IFDIR;
 157                 else
 158                         fMode |= S_IFREG;
 159                 if (!(fdata.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 160                         fMode |= S_IWRITE;
 161
 162                 buf->st_ino = 0;
 163                 buf->st_gid = 0;
 164                 buf->st_uid = 0;
 165                 buf->st_mode = fMode;
 166                 buf->st_size = fdata.nFileSizeLow; /* Can't use nFileSizeHigh, since it's not a stat64 */
 167                 buf->st_blocks = size_to_blocks(buf->st_size);
 168                 buf->st_dev = _getdrive() - 1;
 169                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 170                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 171                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 172                 return 0;
 173         }
 174         errno = EBADF;
 175         return -1;
 176 }
 177
 178 unsigned int sleep (unsigned int seconds)
 179 {
 180         Sleep(seconds*1000);
 181         return 0;
 182 }
 183
 184 int mkstemp(char *template)
 185 {
 186         char *filename = mktemp(template);
 187         if (filename == NULL)
 188                 return -1;
 189         return open(filename, O_RDWR | O_CREAT, 0600);
 190 }
 191
 192 int gettimeofday(struct timeval *tv, void *tz)
 193 {
 194         extern time_t my_mktime(struct tm *tm);
 195         SYSTEMTIME st;
 196         struct tm tm;
 197         GetSystemTime(&st);
 198         tm.tm_year = st.wYear-1900;
 199         tm.tm_mon = st.wMonth-1;
 200         tm.tm_mday = st.wDay;
 201         tm.tm_hour = st.wHour;
 202         tm.tm_min = st.wMinute;
 203         tm.tm_sec = st.wSecond;
 204         tv->tv_sec = my_mktime(&tm);
 205         if (tv->tv_sec < 0)
 206                 return -1;
 207         tv->tv_usec = st.wMilliseconds*1000;
 208         return 0;
 209 }
 210
 211 int pipe(int filedes[2])
 212 {
 213         int fd;
 214         HANDLE h[2], parent;
 215
 216         if (_pipe(filedes, 8192, 0) < 0)
 217                 return -1;
 218
 219         parent = GetCurrentProcess();
 220
 221         if (!DuplicateHandle (parent, (HANDLE)_get_osfhandle(filedes[0]),
 222                         parent, &h[0], 0, FALSE, DUPLICATE_SAME_ACCESS)) {
 223                 close(filedes[0]);
 224                 close(filedes[1]);
 225                 return -1;
 226         }
 227         if (!DuplicateHandle (parent, (HANDLE)_get_osfhandle(filedes[1]),
 228                         parent, &h[1], 0, FALSE, DUPLICATE_SAME_ACCESS)) {
 229                 close(filedes[0]);
 230                 close(filedes[1]);
 231                 CloseHandle(h[0]);
 232                 return -1;
 233         }
 234         fd = _open_osfhandle((int)h[0], O_NOINHERIT);
 235         if (fd < 0) {
 236                 close(filedes[0]);
 237                 close(filedes[1]);
 238                 CloseHandle(h[0]);
 239                 CloseHandle(h[1]);
 240                 return -1;
 241         }
 242         close(filedes[0]);
 243         filedes[0] = fd;
 244         fd = _open_osfhandle((int)h[1], O_NOINHERIT);
 245         if (fd < 0) {
 246                 close(filedes[0]);
 247                 close(filedes[1]);
 248                 CloseHandle(h[1]);
 249                 return -1;
 250         }
 251         close(filedes[1]);
 252         filedes[1] = fd;
 253         return 0;
 254 }
 255
 256 int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 257 {
 258         int i, pending;
 259
 260         if (timeout != -1)
 261                 return errno = EINVAL, error("poll timeout not supported");
 262
 263         /* When there is only one fd to wait for, then we pretend that
 264          * input is available and let the actual wait happen when the
 265          * caller invokes read().
 266          */
 267         if (nfds == 1) {
 268                 if (!(ufds[0].events & POLLIN))
 269                         return errno = EINVAL, error("POLLIN not set");
 270                 ufds[0].revents = POLLIN;
 271                 return 0;
 272         }
 273
 274 repeat:
 275         pending = 0;
 276         for (i = 0; i < nfds; i++) {
 277                 DWORD avail = 0;
 278                 HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 279                 if (h == INVALID_HANDLE_VALUE)
 280                         return -1;      /* errno was set */
 281
 282                 if (!(ufds[i].events & POLLIN))
 283                         return errno = EINVAL, error("POLLIN not set");
 284
 285                 /* this emulation works only for pipes */
 286                 if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 287                         int err = GetLastError();
 288                         if (err == ERROR_BROKEN_PIPE) {
 289                                 ufds[i].revents = POLLHUP;
 290                                 pending++;
 291                         } else {
 292                                 errno = EINVAL;
 293                                 return error("PeekNamedPipe failed,"
 294                                         " GetLastError: %u", err);
 295                         }
 296                 } else if (avail) {
 297                         ufds[i].revents = POLLIN;
 298                         pending++;
 299                 } else
 300                         ufds[i].revents = 0;
 301         }
 302         if (!pending) {
 303                 /* The only times that we spin here is when the process
 304                  * that is connected through the pipes is waiting for
 305                  * its own input data to become available. But since
 306                  * the process (pack-objects) is itself CPU intensive,
 307                  * it will happily pick up the time slice that we are
 308                  * relinguishing here.
 309                  */
 310                 Sleep(0);
 311                 goto repeat;
 312         }
 313         return 0;
 314 }
 315
 316 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 317 {
 318         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 319         memcpy(result, gmtime(timep), sizeof(struct tm));
 320         return result;
 321 }
 322
 323 struct tm *localtime_r(const time_t *timep, struct tm *result)
 324 {
 325         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 326         memcpy(result, localtime(timep), sizeof(struct tm));
 327         return result;
 328 }
 329
 330 #undef getcwd
 331 char *mingw_getcwd(char *pointer, int len)
 332 {
 333         char *ret = getcwd(pointer, len);
 334         if (!ret)
 335                 return ret;
 336         if (pointer[0] != 0 && pointer[1] == ':') {
 337                 int i;
 338                 for (i = 2; pointer[i]; i++)
 339                         /* Thanks, Bill. You'll burn in hell for that. */
 340                         if (pointer[i] == '\\')
 341                                 pointer[i] = '/';
 342         }
 343         return ret;
 344 }
 345
 346 /*
 347  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 348  * (Parsing C++ Command-Line Arguments)
 349  */
 350 static const char *quote_arg(const char *arg)
 351 {
 352         /* count chars to quote */
 353         int len = 0, n = 0;
 354         int force_quotes = 0;
 355         char *q, *d;
 356         const char *p = arg;
 357         if (!*p) force_quotes = 1;
 358         while (*p) {
 359                 if (isspace(*p) || *p == '*' || *p == '?')
 360                         force_quotes = 1;
 361                 else if (*p == '"')
 362                         n++;
 363                 else if (*p == '\\') {
 364                         int count = 0;
 365                         while (*p == '\\') {
 366                                 count++;
 367                                 p++;
 368                                 len++;
 369                         }
 370                         if (*p == '"')
 371                                 n += count*2 + 1;
 372                         continue;
 373                 }
 374                 len++;
 375                 p++;
 376         }
 377         if (!force_quotes && n == 0)
 378                 return arg;
 379
 380         /* insert \ where necessary */
 381         d = q = xmalloc(len+n+3);
 382         *d++ = '"';
 383         while (*arg) {
 384                 if (*arg == '"')
 385                         *d++ = '\\';
 386                 else if (*arg == '\\') {
 387                         int count = 0;
 388                         while (*arg == '\\') {
 389                                 count++;
 390                                 *d++ = *arg++;
 391                         }
 392                         if (*arg == '"') {
 393                                 while (count-- > 0)
 394                                         *d++ = '\\';
 395                                 *d++ = '\\';
 396                         }
 397                 }
 398                 *d++ = *arg++;
 399         }
 400         *d++ = '"';
 401         *d++ = 0;
 402         return q;
 403 }
 404
 405 static const char *parse_interpreter(const char *cmd)
 406 {
 407         static char buf[100];
 408         char *p, *opt;
 409         int n, fd;
 410
 411         /* don't even try a .exe */
 412         n = strlen(cmd);
 413         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 414                 return NULL;
 415
 416         fd = open(cmd, O_RDONLY);
 417         if (fd < 0)
 418                 return NULL;
 419         n = read(fd, buf, sizeof(buf)-1);
 420         close(fd);
 421         if (n < 4)      /* at least '#!/x' and not error */
 422                 return NULL;
 423
 424         if (buf[0] != '#' || buf[1] != '!')
 425                 return NULL;
 426         buf[n] = '\0';
 427         p = strchr(buf, '\n');
 428         if (!p)
 429                 return NULL;
 430
 431         *p = '\0';
 432         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 433                 return NULL;
 434         /* strip options */
 435         if ((opt = strchr(p+1, ' ')))
 436                 *opt = '\0';
 437         return p+1;
 438 }
 439
 440 /*
 441  * Splits the PATH into parts.
 442  */
 443 static char **get_path_split(void)
 444 {
 445         char *p, **path, *envpath = getenv("PATH");
 446         int i, n = 0;
 447
 448         if (!envpath || !*envpath)
 449                 return NULL;
 450
 451         envpath = xstrdup(envpath);
 452         p = envpath;
 453         while (p) {
 454                 char *dir = p;
 455                 p = strchr(p, ';');
 456                 if (p) *p++ = '\0';
 457                 if (*dir) {     /* not earlier, catches series of ; */
 458                         ++n;
 459                 }
 460         }
 461         if (!n)
 462                 return NULL;
 463
 464         path = xmalloc((n+1)*sizeof(char*));
 465         p = envpath;
 466         i = 0;
 467         do {
 468                 if (*p)
 469                         path[i++] = xstrdup(p);
 470                 p = p+strlen(p)+1;
 471         } while (i < n);
 472         path[i] = NULL;
 473
 474         free(envpath);
 475
 476         return path;
 477 }
 478
 479 static void free_path_split(char **path)
 480 {
 481         if (!path)
 482                 return;
 483
 484         char **p = path;
 485         while (*p)
 486                 free(*p++);
 487         free(path);
 488 }
 489
 490 /*
 491  * exe_only means that we only want to detect .exe files, but not scripts
 492  * (which do not have an extension)
 493  */
 494 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 495 {
 496         char path[MAX_PATH];
 497         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 498
 499         if (!isexe && access(path, F_OK) == 0)
 500                 return xstrdup(path);
 501         path[strlen(path)-4] = '\0';
 502         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 503                 return xstrdup(path);
 504         return NULL;
 505 }
 506
 507 /*
 508  * Determines the absolute path of cmd using the the split path in path.
 509  * If cmd contains a slash or backslash, no lookup is performed.
 510  */
 511 static char *path_lookup(const char *cmd, char **path, int exe_only)
 512 {
 513         char *prog = NULL;
 514         int len = strlen(cmd);
 515         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 516
 517         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 518                 prog = xstrdup(cmd);
 519
 520         while (!prog && *path)
 521                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 522
 523         return prog;
 524 }
 525
 526 static int env_compare(const void *a, const void *b)
 527 {
 528         char *const *ea = a;
 529         char *const *eb = b;
 530         return strcasecmp(*ea, *eb);
 531 }
 532
 533 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 534                            int prepend_cmd)
 535 {
 536         STARTUPINFO si;
 537         PROCESS_INFORMATION pi;
 538         struct strbuf envblk, args;
 539         unsigned flags;
 540         BOOL ret;
 541
 542         /* Determine whether or not we are associated to a console */
 543         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 544                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 545                         FILE_ATTRIBUTE_NORMAL, NULL);
 546         if (cons == INVALID_HANDLE_VALUE) {
 547                 /* There is no console associated with this process.
 548                  * Since the child is a console process, Windows
 549                  * would normally create a console window. But
 550                  * since we'll be redirecting std streams, we do
 551                  * not need the console.
 552                  */
 553                 flags = CREATE_NO_WINDOW;
 554         } else {
 555                 /* There is already a console. If we specified
 556                  * CREATE_NO_WINDOW here, too, Windows would
 557                  * disassociate the child from the console.
 558                  * Go figure!
 559                  */
 560                 flags = 0;
 561                 CloseHandle(cons);
 562         }
 563         memset(&si, 0, sizeof(si));
 564         si.cb = sizeof(si);
 565         si.dwFlags = STARTF_USESTDHANDLES;
 566         si.hStdInput = (HANDLE) _get_osfhandle(0);
 567         si.hStdOutput = (HANDLE) _get_osfhandle(1);
 568         si.hStdError = (HANDLE) _get_osfhandle(2);
 569
 570         /* concatenate argv, quoting args as we go */
 571         strbuf_init(&args, 0);
 572         if (prepend_cmd) {
 573                 char *quoted = (char *)quote_arg(cmd);
 574                 strbuf_addstr(&args, quoted);
 575                 if (quoted != cmd)
 576                         free(quoted);
 577         }
 578         for (; *argv; argv++) {
 579                 char *quoted = (char *)quote_arg(*argv);
 580                 if (*args.buf)
 581                         strbuf_addch(&args, ' ');
 582                 strbuf_addstr(&args, quoted);
 583                 if (quoted != *argv)
 584                         free(quoted);
 585         }
 586
 587         if (env) {
 588                 int count = 0;
 589                 char **e, **sorted_env;
 590
 591                 for (e = env; *e; e++)
 592                         count++;
 593
 594                 /* environment must be sorted */
 595                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 596                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 597                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 598
 599                 strbuf_init(&envblk, 0);
 600                 for (e = sorted_env; *e; e++) {
 601                         strbuf_addstr(&envblk, *e);
 602                         strbuf_addch(&envblk, '\0');
 603                 }
 604                 free(sorted_env);
 605         }
 606
 607         memset(&pi, 0, sizeof(pi));
 608         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 609                 env ? envblk.buf : NULL, NULL, &si, &pi);
 610
 611         if (env)
 612                 strbuf_release(&envblk);
 613         strbuf_release(&args);
 614
 615         if (!ret) {
 616                 errno = ENOENT;
 617                 return -1;
 618         }
 619         CloseHandle(pi.hThread);
 620         return (pid_t)pi.hProcess;
 621 }
 622
 623 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env)
 624 {
 625         pid_t pid;
 626         char **path = get_path_split();
 627         char *prog = path_lookup(cmd, path, 0);
 628
 629         if (!prog) {
 630                 errno = ENOENT;
 631                 pid = -1;
 632         }
 633         else {
 634                 const char *interpr = parse_interpreter(prog);
 635
 636                 if (interpr) {
 637                         const char *argv0 = argv[0];
 638                         char *iprog = path_lookup(interpr, path, 1);
 639                         argv[0] = prog;
 640                         if (!iprog) {
 641                                 errno = ENOENT;
 642                                 pid = -1;
 643                         }
 644                         else {
 645                                 pid = mingw_spawnve(iprog, argv, env, 1);
 646                                 free(iprog);
 647                         }
 648                         argv[0] = argv0;
 649                 }
 650                 else
 651                         pid = mingw_spawnve(prog, argv, env, 0);
 652                 free(prog);
 653         }
 654         free_path_split(path);
 655         return pid;
 656 }
 657
 658 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 659 {
 660         const char *interpr = parse_interpreter(cmd);
 661         char **path;
 662         char *prog;
 663         int pid = 0;
 664
 665         if (!interpr)
 666                 return 0;
 667         path = get_path_split();
 668         prog = path_lookup(interpr, path, 1);
 669         if (prog) {
 670                 int argc = 0;
 671                 const char **argv2;
 672                 while (argv[argc]) argc++;
 673                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
 674                 argv2[0] = (char *)cmd; /* full path to the script file */
 675                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 676                 pid = mingw_spawnve(prog, argv2, env, 1);
 677                 if (pid >= 0) {
 678                         int status;
 679                         if (waitpid(pid, &status, 0) < 0)
 680                                 status = 255;
 681                         exit(status);
 682                 }
 683                 pid = 1;        /* indicate that we tried but failed */
 684                 free(prog);
 685                 free(argv2);
 686         }
 687         free_path_split(path);
 688         return pid;
 689 }
 690
 691 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 692 {
 693         /* check if git_command is a shell script */
 694         if (!try_shell_exec(cmd, argv, (char **)env)) {
 695                 int pid, status;
 696
 697                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 698                 if (pid < 0)
 699                         return;
 700                 if (waitpid(pid, &status, 0) < 0)
 701                         status = 255;
 702                 exit(status);
 703         }
 704 }
 705
 706 void mingw_execvp(const char *cmd, char *const *argv)
 707 {
 708         char **path = get_path_split();
 709         char *prog = path_lookup(cmd, path, 0);
 710
 711         if (prog) {
 712                 mingw_execve(prog, argv, environ);
 713                 free(prog);
 714         } else
 715                 errno = ENOENT;
 716
 717         free_path_split(path);
 718 }
 719
 720 char **copy_environ()
 721 {
 722         char **env;
 723         int i = 0;
 724         while (environ[i])
 725                 i++;
 726         env = xmalloc((i+1)*sizeof(*env));
 727         for (i = 0; environ[i]; i++)
 728                 env[i] = xstrdup(environ[i]);
 729         env[i] = NULL;
 730         return env;
 731 }
 732
 733 void free_environ(char **env)
 734 {
 735         int i;
 736         for (i = 0; env[i]; i++)
 737                 free(env[i]);
 738         free(env);
 739 }
 740
 741 static int lookup_env(char **env, const char *name, size_t nmln)
 742 {
 743         int i;
 744
 745         for (i = 0; env[i]; i++) {
 746                 if (0 == strncmp(env[i], name, nmln)
 747                     && '=' == env[i][nmln])
 748                         /* matches */
 749                         return i;
 750         }
 751         return -1;
 752 }
 753
 754 /*
 755  * If name contains '=', then sets the variable, otherwise it unsets it
 756  */
 757 char **env_setenv(char **env, const char *name)
 758 {
 759         char *eq = strchrnul(name, '=');
 760         int i = lookup_env(env, name, eq-name);
 761
 762         if (i < 0) {
 763                 if (*eq) {
 764                         for (i = 0; env[i]; i++)
 765                                 ;
 766                         env = xrealloc(env, (i+2)*sizeof(*env));
 767                         env[i] = xstrdup(name);
 768                         env[i+1] = NULL;
 769                 }
 770         }
 771         else {
 772                 free(env[i]);
 773                 if (*eq)
 774                         env[i] = xstrdup(name);
 775                 else
 776                         for (; env[i]; i++)
 777                                 env[i] = env[i+1];
 778         }
 779         return env;
 780 }
 781
 782 /* this is the first function to call into WS_32; initialize it */
 783 #undef gethostbyname
 784 struct hostent *mingw_gethostbyname(const char *host)
 785 {
 786         WSADATA wsa;
 787
 788         if (WSAStartup(MAKEWORD(2,2), &wsa))
 789                 die("unable to initialize winsock subsystem, error %d",
 790                         WSAGetLastError());
 791         atexit((void(*)(void)) WSACleanup);
 792         return gethostbyname(host);
 793 }
 794
 795 int mingw_socket(int domain, int type, int protocol)
 796 {
 797         int sockfd;
 798         SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
 799         if (s == INVALID_SOCKET) {
 800                 /*
 801                  * WSAGetLastError() values are regular BSD error codes
 802                  * biased by WSABASEERR.
 803                  * However, strerror() does not know about networking
 804                  * specific errors, which are values beginning at 38 or so.
 805                  * Therefore, we choose to leave the biased error code
 806                  * in errno so that _if_ someone looks up the code somewhere,
 807                  * then it is at least the number that are usually listed.
 808                  */
 809                 errno = WSAGetLastError();
 810                 return -1;
 811         }
 812         /* convert into a file descriptor */
 813         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
 814                 closesocket(s);
 815                 return error("unable to make a socket file descriptor: %s",
 816                         strerror(errno));
 817         }
 818         return sockfd;
 819 }
 820
 821 #undef connect
 822 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
 823 {
 824         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
 825         return connect(s, sa, sz);
 826 }
 827
 828 #undef rename
 829 int mingw_rename(const char *pold, const char *pnew)
 830 {
 831         /*
 832          * Try native rename() first to get errno right.
 833          * It is based on MoveFile(), which cannot overwrite existing files.
 834          */
 835         if (!rename(pold, pnew))
 836                 return 0;
 837         if (errno != EEXIST)
 838                 return -1;
 839         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
 840                 return 0;
 841         /* TODO: translate more errors */
 842         if (GetLastError() == ERROR_ACCESS_DENIED) {
 843                 DWORD attrs = GetFileAttributes(pnew);
 844                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY)) {
 845                         errno = EISDIR;
 846                         return -1;
 847                 }
 848         }
 849         errno = EACCES;
 850         return -1;
 851 }
 852
 853 #undef vsnprintf
 854 /* Note that the size parameter specifies the available space, i.e.
 855  * includes the trailing NUL byte; but Windows's vsnprintf expects the
 856  * number of characters to write without the trailing NUL.
 857  */
 858
 859 /* This is out of line because it uses alloca() behind the scenes,
 860  * which must not be called in a loop (alloca() reclaims the allocations
 861  * only at function exit).
 862  */
 863 static int try_vsnprintf(size_t size, const char *fmt, va_list args)
 864 {
 865         char buf[size]; /* gcc-ism */
 866         return vsnprintf(buf, size-1, fmt, args);
 867 }
 868
 869 int mingw_vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
 870 {
 871         int len;
 872         if (size > 0) {
 873                 len = vsnprintf(buf, size-1, fmt, args);
 874                 if (len >= 0)
 875                         return len;
 876         }
 877         /* ouch, buffer too small; need to compute the size */
 878         if (size < 250)
 879                 size = 250;
 880         do {
 881                 size *= 4;
 882                 len = try_vsnprintf(size, fmt, args);
 883         } while (len < 0);
 884         return len;
 885 }
 886
 887 struct passwd *getpwuid(int uid)
 888 {
 889         static char user_name[100];
 890         static struct passwd p;
 891
 892         DWORD len = sizeof(user_name);
 893         if (!GetUserName(user_name, &len))
 894                 return NULL;
 895         p.pw_name = user_name;
 896         p.pw_gecos = "unknown";
 897         p.pw_dir = NULL;
 898         return &p;
 899 }
 900
 901 static HANDLE timer_event;
 902 static HANDLE timer_thread;
 903 static int timer_interval;
 904 static int one_shot;
 905 static sig_handler_t timer_fn = SIG_DFL;
 906
 907 /* The timer works like this:
 908  * The thread, ticktack(), is basically a trivial routine that most of the
 909  * time only waits to receive the signal to terminate. The main thread
 910  * tells the thread to terminate by setting the timer_event to the signalled
 911  * state.
 912  * But ticktack() does not wait indefinitely; instead, it interrupts the
 913  * wait state every now and then, namely exactly after timer's interval
 914  * length. At these opportunities it calls the signal handler.
 915  */
 916
 917 static __stdcall unsigned ticktack(void *dummy)
 918 {
 919         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
 920                 if (timer_fn == SIG_DFL)
 921                         die("Alarm");
 922                 if (timer_fn != SIG_IGN)
 923                         timer_fn(SIGALRM);
 924                 if (one_shot)
 925                         break;
 926         }
 927         return 0;
 928 }
 929
 930 static int start_timer_thread(void)
 931 {
 932         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
 933         if (timer_event) {
 934                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
 935                 if (!timer_thread )
 936                         return errno = ENOMEM,
 937                                 error("cannot start timer thread");
 938         } else
 939                 return errno = ENOMEM,
 940                         error("cannot allocate resources timer");
 941         return 0;
 942 }
 943
 944 static void stop_timer_thread(void)
 945 {
 946         if (timer_event)
 947                 SetEvent(timer_event);  /* tell thread to terminate */
 948         if (timer_thread) {
 949                 int rc = WaitForSingleObject(timer_thread, 1000);
 950                 if (rc == WAIT_TIMEOUT)
 951                         error("timer thread did not terminate timely");
 952                 else if (rc != WAIT_OBJECT_0)
 953                         error("waiting for timer thread failed: %lu",
 954                               GetLastError());
 955                 CloseHandle(timer_thread);
 956         }
 957         if (timer_event)
 958                 CloseHandle(timer_event);
 959         timer_event = NULL;
 960         timer_thread = NULL;
 961 }
 962
 963 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
 964 {
 965         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
 966 }
 967
 968 int setitimer(int type, struct itimerval *in, struct itimerval *out)
 969 {
 970         static const struct timeval zero;
 971         static int atexit_done;
 972
 973         if (out != NULL)
 974                 return errno = EINVAL,
 975                         error("setitmer param 3 != NULL not implemented");
 976         if (!is_timeval_eq(&in->it_interval, &zero) &&
 977             !is_timeval_eq(&in->it_interval, &in->it_value))
 978                 return errno = EINVAL,
 979                         error("setitmer: it_interval must be zero or eq it_value");
 980
 981         if (timer_thread)
 982                 stop_timer_thread();
 983
 984         if (is_timeval_eq(&in->it_value, &zero) &&
 985             is_timeval_eq(&in->it_interval, &zero))
 986                 return 0;
 987
 988         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
 989         one_shot = is_timeval_eq(&in->it_interval, &zero);
 990         if (!atexit_done) {
 991                 atexit(stop_timer_thread);
 992                 atexit_done = 1;
 993         }
 994         return start_timer_thread();
 995 }
 996
 997 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
 998 {
 999         if (sig != SIGALRM)
1000                 return errno = EINVAL,
1001                         error("sigaction only implemented for SIGALRM");
1002         if (out != NULL)
1003                 return errno = EINVAL,
1004                         error("sigaction: param 3 != NULL not implemented");
1005
1006         timer_fn = in->sa_handler;
1007         return 0;
1008 }
1009
1010 #undef signal
1011 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1012 {
1013         if (sig != SIGALRM)
1014                 return signal(sig, handler);
1015         sig_handler_t old = timer_fn;
1016         timer_fn = handler;
1017         return old;
1018 }