compat/mingw.c

   1 #include "../common/git-compat-util.h"
   2 #include "../common/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         int fd;
  12
  13         va_start(args, oflags);
  14         mode = va_arg(args, int);
  15         va_end(args);
  16
  17         if (!strcmp(filename, "/dev/null"))
  18                 filename = "nul";
  19         fd = open(filename, oflags, mode);
  20         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
  21                 DWORD attrs = GetFileAttributes(filename);
  22                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
  23                         errno = EISDIR;
  24         }
  25         return fd;
  26 }
  27
  28 static inline time_t filetime_to_time_t(const FILETIME *ft)
  29 {
  30         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
  31         winTime -= 116444736000000000LL; /* Windows to Unix Epoch conversion */
  32         winTime /= 10000000;             /* Nano to seconds resolution */
  33         return (time_t)winTime;
  34 }
  35
  36 static inline size_t size_to_blocks(size_t s)
  37 {
  38         return (s+511)/512;
  39 }
  40
  41 extern int _getdrive( void );
  42 /* We keep the do_lstat code in a separate function to avoid recursion.
  43  * When a path ends with a slash, the stat will fail with ENOENT. In
  44  * this case, we strip the trailing slashes and stat again.
  45  */
  46 static int do_lstat(const char *file_name, struct stat *buf)
  47 {
  48         WIN32_FILE_ATTRIBUTE_DATA fdata;
  49
  50         if (GetFileAttributesExA(file_name, GetFileExInfoStandard, &fdata)) {
  51                 int fMode = S_IREAD;
  52                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
  53                         fMode |= S_IFDIR;
  54                 else
  55                         fMode |= S_IFREG;
  56                 if (!(fdata.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
  57                         fMode |= S_IWRITE;
  58
  59                 buf->st_ino = 0;
  60                 buf->st_gid = 0;
  61                 buf->st_uid = 0;
  62                 buf->st_mode = fMode;
  63                 buf->st_size = fdata.nFileSizeLow; /* Can't use nFileSizeHigh, since it's not a stat64 */
  64                 buf->st_blocks = size_to_blocks(buf->st_size);
  65                 buf->st_dev = _getdrive() - 1;
  66                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
  67                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
  68                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
  69                 errno = 0;
  70                 return 0;
  71         }
  72
  73         switch (GetLastError()) {
  74         case ERROR_ACCESS_DENIED:
  75         case ERROR_SHARING_VIOLATION:
  76         case ERROR_LOCK_VIOLATION:
  77         case ERROR_SHARING_BUFFER_EXCEEDED:
  78                 errno = EACCES;
  79                 break;
  80         case ERROR_BUFFER_OVERFLOW:
  81                 errno = ENAMETOOLONG;
  82                 break;
  83         case ERROR_NOT_ENOUGH_MEMORY:
  84                 errno = ENOMEM;
  85                 break;
  86         default:
  87                 errno = ENOENT;
  88                 break;
  89         }
  90         return -1;
  91 }
  92
  93 /* We provide our own lstat/fstat functions, since the provided
  94  * lstat/fstat functions are so slow. These stat functions are
  95  * tailored for Git's usage (read: fast), and are not meant to be
  96  * complete. Note that Git stat()s are redirected to mingw_lstat()
  97  * too, since Windows doesn't really handle symlinks that well.
  98  */
  99 int mingw_lstat(const char *file_name, struct mingw_stat *buf)
 100 {
 101         int namelen;
 102         static char alt_name[PATH_MAX];
 103
 104         if (!do_lstat(file_name, buf))
 105                 return 0;
 106
 107         /* if file_name ended in a '/', Windows returned ENOENT;
 108          * try again without trailing slashes
 109          */
 110         if (errno != ENOENT)
 111                 return -1;
 112
 113         namelen = strlen(file_name);
 114         if (namelen && file_name[namelen-1] != '/')
 115                 return -1;
 116         while (namelen && file_name[namelen-1] == '/')
 117                 --namelen;
 118         if (!namelen || namelen >= PATH_MAX)
 119                 return -1;
 120
 121         memcpy(alt_name, file_name, namelen);
 122         alt_name[namelen] = 0;
 123         return do_lstat(alt_name, buf);
 124 }
 125
 126 #undef fstat
 127 #undef stat
 128 int mingw_fstat(int fd, struct mingw_stat *buf)
 129 {
 130         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 131         BY_HANDLE_FILE_INFORMATION fdata;
 132
 133         if (fh == INVALID_HANDLE_VALUE) {
 134                 errno = EBADF;
 135                 return -1;
 136         }
 137         /* direct non-file handles to MS's fstat() */
 138         if (GetFileType(fh) != FILE_TYPE_DISK) {
 139                 struct stat st;
 140                 if (fstat(fd, &st))
 141                         return -1;
 142                 buf->st_ino = st.st_ino;
 143                 buf->st_gid = st.st_gid;
 144                 buf->st_uid = st.st_uid;
 145                 buf->st_mode = st.st_mode;
 146                 buf->st_size = st.st_size;
 147                 buf->st_blocks = size_to_blocks(buf->st_size);
 148                 buf->st_dev = st.st_dev;
 149                 buf->st_atime = st.st_atime;
 150                 buf->st_mtime = st.st_mtime;
 151                 buf->st_ctime = st.st_ctime;
 152                 return 0;
 153         }
 154
 155         if (GetFileInformationByHandle(fh, &fdata)) {
 156                 int fMode = S_IREAD;
 157                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
 158                         fMode |= S_IFDIR;
 159                 else
 160                         fMode |= S_IFREG;
 161                 if (!(fdata.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 162                         fMode |= S_IWRITE;
 163
 164                 buf->st_ino = 0;
 165                 buf->st_gid = 0;
 166                 buf->st_uid = 0;
 167                 buf->st_mode = fMode;
 168                 buf->st_size = fdata.nFileSizeLow; /* Can't use nFileSizeHigh, since it's not a stat64 */
 169                 buf->st_blocks = size_to_blocks(buf->st_size);
 170                 buf->st_dev = _getdrive() - 1;
 171                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 172                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 173                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 174                 return 0;
 175         }
 176         errno = EBADF;
 177         return -1;
 178 }
 179
 180 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 181 {
 182         long long winTime = t * 10000000LL + 116444736000000000LL;
 183         ft->dwLowDateTime = (DWORD)winTime;
 184         ft->dwHighDateTime = winTime >> 32;
 185 }
 186
 187 int mingw_utime (const char *file_name, const struct utimbuf *times)
 188 {
 189         FILETIME mft, aft;
 190         int fh, rc;
 191
 192         /* must have write permission */
 193         if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0)
 194                 return -1;
 195
 196         time_t_to_filetime(times->modtime, &mft);
 197         time_t_to_filetime(times->actime, &aft);
 198         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 199                 errno = EINVAL;
 200                 rc = -1;
 201         } else
 202                 rc = 0;
 203         close(fh);
 204         return rc;
 205 }
 206
 207 unsigned int sleep (unsigned int seconds)
 208 {
 209         Sleep(seconds*1000);
 210         return 0;
 211 }
 212
 213 int mkstemp(char *template)
 214 {
 215         char *filename = mktemp(template);
 216         if (filename == NULL)
 217                 return -1;
 218         return open(filename, O_RDWR | O_CREAT, 0600);
 219 }
 220
 221 int gettimeofday(struct timeval *tv, void *tz)
 222 {
 223         SYSTEMTIME st;
 224         struct tm tm;
 225         GetSystemTime(&st);
 226         tm.tm_year = st.wYear-1900;
 227         tm.tm_mon = st.wMonth-1;
 228         tm.tm_mday = st.wDay;
 229         tm.tm_hour = st.wHour;
 230         tm.tm_min = st.wMinute;
 231         tm.tm_sec = st.wSecond;
 232         tv->tv_sec = tm_to_time_t(&tm);
 233         if (tv->tv_sec < 0)
 234                 return -1;
 235         tv->tv_usec = st.wMilliseconds*1000;
 236         return 0;
 237 }
 238
 239 int pipe(int filedes[2])
 240 {
 241         int fd;
 242         HANDLE h[2], parent;
 243
 244         if (_pipe(filedes, 8192, 0) < 0)
 245                 return -1;
 246
 247         parent = GetCurrentProcess();
 248
 249         if (!DuplicateHandle (parent, (HANDLE)_get_osfhandle(filedes[0]),
 250                         parent, &h[0], 0, FALSE, DUPLICATE_SAME_ACCESS)) {
 251                 close(filedes[0]);
 252                 close(filedes[1]);
 253                 return -1;
 254         }
 255         if (!DuplicateHandle (parent, (HANDLE)_get_osfhandle(filedes[1]),
 256                         parent, &h[1], 0, FALSE, DUPLICATE_SAME_ACCESS)) {
 257                 close(filedes[0]);
 258                 close(filedes[1]);
 259                 CloseHandle(h[0]);
 260                 return -1;
 261         }
 262         fd = _open_osfhandle((intptr_t)h[0], O_NOINHERIT);
 263         if (fd < 0) {
 264                 close(filedes[0]);
 265                 close(filedes[1]);
 266                 CloseHandle(h[0]);
 267                 CloseHandle(h[1]);
 268                 return -1;
 269         }
 270         close(filedes[0]);
 271         filedes[0] = fd;
 272         fd = _open_osfhandle((intptr_t)h[1], O_NOINHERIT);
 273         if (fd < 0) {
 274                 close(filedes[0]);
 275                 close(filedes[1]);
 276                 CloseHandle(h[1]);
 277                 return -1;
 278         }
 279         close(filedes[1]);
 280         filedes[1] = fd;
 281         return 0;
 282 }
 283
 284 int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 285 {
 286         unsigned int i;
 287         int pending;
 288
 289         if (timeout != -1)
 290                 return errno = EINVAL, error("poll timeout not supported");
 291
 292         /* When there is only one fd to wait for, then we pretend that
 293          * input is available and let the actual wait happen when the
 294          * caller invokes read().
 295          */
 296         if (nfds == 1) {
 297                 if (!(ufds[0].events & POLLIN))
 298                         return errno = EINVAL, error("POLLIN not set");
 299                 ufds[0].revents = POLLIN;
 300                 return 0;
 301         }
 302
 303 repeat:
 304         pending = 0;
 305         for (i = 0; i < nfds; i++) {
 306                 DWORD avail = 0;
 307                 HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 308                 if (h == INVALID_HANDLE_VALUE)
 309                         return -1;      /* errno was set */
 310
 311                 if (!(ufds[i].events & POLLIN))
 312                         return errno = EINVAL, error("POLLIN not set");
 313
 314                 /* this emulation works only for pipes */
 315                 if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 316                         int err = GetLastError();
 317                         if (err == ERROR_BROKEN_PIPE) {
 318                                 ufds[i].revents = POLLHUP;
 319                                 pending++;
 320                         } else {
 321                                 errno = EINVAL;
 322                                 return error("PeekNamedPipe failed,"
 323                                         " GetLastError: %u", err);
 324                         }
 325                 } else if (avail) {
 326                         ufds[i].revents = POLLIN;
 327                         pending++;
 328                 } else
 329                         ufds[i].revents = 0;
 330         }
 331         if (!pending) {
 332                 /* The only times that we spin here is when the process
 333                  * that is connected through the pipes is waiting for
 334                  * its own input data to become available. But since
 335                  * the process (pack-objects) is itself CPU intensive,
 336                  * it will happily pick up the time slice that we are
 337                  * relinguishing here.
 338                  */
 339                 Sleep(0);
 340                 goto repeat;
 341         }
 342         return 0;
 343 }
 344
 345 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 346 {
 347         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 348         memcpy(result, gmtime(timep), sizeof(struct tm));
 349         return result;
 350 }
 351
 352 struct tm *localtime_r(const time_t *timep, struct tm *result)
 353 {
 354         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 355         memcpy(result, localtime(timep), sizeof(struct tm));
 356         return result;
 357 }
 358
 359 #undef getcwd
 360 char *mingw_getcwd(char *pointer, int len)
 361 {
 362         int i;
 363         char *ret = getcwd(pointer, len);
 364         if (!ret)
 365                 return ret;
 366         for (i = 0; pointer[i]; i++)
 367                 if (pointer[i] == '\\')
 368                         pointer[i] = '/';
 369         return ret;
 370 }
 371
 372 #undef getenv
 373 char *mingw_getenv(const char *name)
 374 {
 375         char *result = getenv(name);
 376         if (!result && !strcmp(name, "TMPDIR")) {
 377                 /* on Windows it is TMP and TEMP */
 378                 result = getenv("TMP");
 379                 if (!result)
 380                         result = getenv("TEMP");
 381         }
 382         return result;
 383 }
 384
 385 /*
 386  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 387  * (Parsing C++ Command-Line Arguments)
 388  */
 389 static const char *quote_arg(const char *arg)
 390 {
 391         /* count chars to quote */
 392         int len = 0, n = 0;
 393         int force_quotes = 0;
 394         char *q, *d;
 395         const char *p = arg;
 396         if (!*p) force_quotes = 1;
 397         while (*p) {
 398                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{')
 399                         force_quotes = 1;
 400                 else if (*p == '"')
 401                         n++;
 402                 else if (*p == '\\') {
 403                         int count = 0;
 404                         while (*p == '\\') {
 405                                 count++;
 406                                 p++;
 407                                 len++;
 408                         }
 409                         if (*p == '"')
 410                                 n += count*2 + 1;
 411                         continue;
 412                 }
 413                 len++;
 414                 p++;
 415         }
 416         if (!force_quotes && n == 0)
 417                 return arg;
 418
 419         /* insert \ where necessary */
 420         d = q = xmalloc(len+n+3);
 421         *d++ = '"';
 422         while (*arg) {
 423                 if (*arg == '"')
 424                         *d++ = '\\';
 425                 else if (*arg == '\\') {
 426                         int count = 0;
 427                         while (*arg == '\\') {
 428                                 count++;
 429                                 *d++ = *arg++;
 430                         }
 431                         if (*arg == '"') {
 432                                 while (count-- > 0)
 433                                         *d++ = '\\';
 434                                 *d++ = '\\';
 435                         }
 436                 }
 437                 *d++ = *arg++;
 438         }
 439         *d++ = '"';
 440         *d++ = 0;
 441         return q;
 442 }
 443
 444 static const char *parse_interpreter(const char *cmd)
 445 {
 446         static char buf[100];
 447         char *p, *opt;
 448         int n, fd;
 449
 450         /* don't even try a .exe */
 451         n = strlen(cmd);
 452         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 453                 return NULL;
 454
 455         fd = open(cmd, O_RDONLY);
 456         if (fd < 0)
 457                 return NULL;
 458         n = read(fd, buf, sizeof(buf)-1);
 459         close(fd);
 460         if (n < 4)      /* at least '#!/x' and not error */
 461                 return NULL;
 462
 463         if (buf[0] != '#' || buf[1] != '!')
 464                 return NULL;
 465         buf[n] = '\0';
 466         p = buf + strcspn(buf, "\r\n");
 467         if (!*p)
 468                 return NULL;
 469
 470         *p = '\0';
 471         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 472                 return NULL;
 473         /* strip options */
 474         if ((opt = strchr(p+1, ' ')))
 475                 *opt = '\0';
 476         return p+1;
 477 }
 478
 479 /*
 480  * returns value of PATH environment variable in the given environment or
 481  * in the system environment if NULL == env
 482  */
 483 static char *get_path(char **env)
 484 {
 485         char **e;
 486         if (!env)
 487                 return getenv("PATH");
 488
 489         for (e = env; *e; e++) {
 490                 /* if it's PATH variable (could be Path= too!) */
 491                 if (!strnicmp(*e, "PATH=", 5)) {
 492                         return *e + 5;
 493                 }
 494         }
 495
 496         return NULL;
 497 }
 498
 499 /*
 500  * Splits the PATH into parts.
 501  */
 502 static char **get_path_split(char **env)
 503 {
 504         char *p, **path, *envpath = get_path(env);
 505         int i, n = 0;
 506
 507         if (!envpath || !*envpath)
 508                 return NULL;
 509
 510         envpath = xstrdup(envpath);
 511         p = envpath;
 512         while (p) {
 513                 char *dir = p;
 514                 p = strchr(p, ';');
 515                 if (p) *p++ = '\0';
 516                 if (*dir) {     /* not earlier, catches series of ; */
 517                         ++n;
 518                 }
 519         }
 520         if (!n)
 521                 return NULL;
 522
 523         path = xmalloc((n+1)*sizeof(char*));
 524         p = envpath;
 525         i = 0;
 526         do {
 527                 if (*p)
 528                         path[i++] = xstrdup(p);
 529                 p = p+strlen(p)+1;
 530         } while (i < n);
 531         path[i] = NULL;
 532
 533         free(envpath);
 534
 535         return path;
 536 }
 537
 538 static void free_path_split(char **path)
 539 {
 540         char **p;
 541         if (!path)
 542                 return;
 543
 544         p = path;
 545         while (*p)
 546                 free(*p++);
 547         free(path);
 548 }
 549
 550 /*
 551  * exe_only means that we only want to detect .exe files, but not scripts
 552  * (which do not have an extension)
 553  */
 554 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 555 {
 556         char path[MAX_PATH];
 557         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 558
 559         if (!isexe && access(path, F_OK) == 0)
 560                 return xstrdup(path);
 561         path[strlen(path)-4] = '\0';
 562         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 563                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 564                         return xstrdup(path);
 565         return NULL;
 566 }
 567
 568 /*
 569  * Determines the absolute path of cmd using the the split path in path.
 570  * If cmd contains a slash or backslash, no lookup is performed.
 571  */
 572 static char *path_lookup(const char *cmd, char **path, int exe_only)
 573 {
 574         char *prog = NULL;
 575         int len = strlen(cmd);
 576         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 577
 578         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 579                 prog = xstrdup(cmd);
 580
 581         while (!prog && *path)
 582                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 583
 584         return prog;
 585 }
 586
 587 static int env_compare(const void *a, const void *b)
 588 {
 589         char *const *ea = a;
 590         char *const *eb = b;
 591         return strcasecmp(*ea, *eb);
 592 }
 593
 594 static pid_t mingw_spawnve_cwd(const char *cmd, const char **argv, char **env,
 595                            int prepend_cmd, const char *working_directory)
 596 {
 597         STARTUPINFO si;
 598         PROCESS_INFORMATION pi;
 599         struct strbuf envblk, args;
 600         unsigned flags;
 601         BOOL ret;
 602
 603         /* Determine whether or not we are associated to a console */
 604         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 605                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 606                         FILE_ATTRIBUTE_NORMAL, NULL);
 607         if (cons == INVALID_HANDLE_VALUE) {
 608                 /* There is no console associated with this process.
 609                  * Since the child is a console process, Windows
 610                  * would normally create a console window. But
 611                  * since we'll be redirecting std streams, we do
 612                  * not need the console.
 613                  */
 614                 flags = CREATE_NO_WINDOW;
 615         } else {
 616                 /* There is already a console. If we specified
 617                  * CREATE_NO_WINDOW here, too, Windows would
 618                  * disassociate the child from the console.
 619                  * Go figure!
 620                  */
 621                 flags = 0;
 622                 CloseHandle(cons);
 623         }
 624         memset(&si, 0, sizeof(si));
 625         si.cb = sizeof(si);
 626         si.dwFlags = STARTF_USESTDHANDLES;
 627         si.hStdInput = (HANDLE) _get_osfhandle(0);
 628         si.hStdOutput = (HANDLE) _get_osfhandle(1);
 629         si.hStdError = (HANDLE) _get_osfhandle(2);
 630
 631         /* concatenate argv, quoting args as we go */
 632         strbuf_init(&args, 0);
 633         if (prepend_cmd) {
 634                 char *quoted = (char *)quote_arg(cmd);
 635                 strbuf_addstr(&args, quoted);
 636                 if (quoted != cmd)
 637                         free(quoted);
 638         }
 639         for (; *argv; argv++) {
 640                 char *quoted = (char *)quote_arg(*argv);
 641                 if (*args.buf)
 642                         strbuf_addch(&args, ' ');
 643                 strbuf_addstr(&args, quoted);
 644                 if (quoted != *argv)
 645                         free(quoted);
 646         }
 647
 648         if (env) {
 649                 int count = 0;
 650                 char **e, **sorted_env;
 651
 652                 for (e = env; *e; e++)
 653                         count++;
 654
 655                 /* environment must be sorted */
 656                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 657                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 658                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 659
 660                 strbuf_init(&envblk, 0);
 661                 for (e = sorted_env; *e; e++) {
 662                         strbuf_addstr(&envblk, *e);
 663                         strbuf_addch(&envblk, '\0');
 664                 }
 665                 free(sorted_env);
 666         }
 667
 668         memset(&pi, 0, sizeof(pi));
 669         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 670                 env ? envblk.buf : NULL, working_directory, &si, &pi);
 671
 672         if (env)
 673                 strbuf_release(&envblk);
 674         strbuf_release(&args);
 675
 676         if (!ret) {
 677                 errno = ENOENT;
 678                 return -1;
 679         }
 680         CloseHandle(pi.hThread);
 681         return (pid_t)pi.hProcess;
 682 }
 683
 684 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 685                            int prepend_cmd)
 686 {
 687         return mingw_spawnve_cwd(cmd, argv, env, prepend_cmd, NULL);
 688 }
 689
 690 pid_t mingw_spawnvpe_cwd(const char *cmd, const char **argv, char **env,
 691                          const char *working_directory)
 692 {
 693         pid_t pid;
 694         char **path = get_path_split(env);
 695         char *prog = path_lookup(cmd, path, 0);
 696
 697         if (!prog) {
 698                 errno = ENOENT;
 699                 pid = -1;
 700         }
 701         else {
 702                 const char *interpr = parse_interpreter(prog);
 703
 704                 if (interpr) {
 705                         const char *argv0 = argv[0];
 706                         char *iprog = path_lookup(interpr, path, 1);
 707                         argv[0] = prog;
 708                         if (!iprog) {
 709                                 errno = ENOENT;
 710                                 pid = -1;
 711                         }
 712                         else {
 713                                 pid = mingw_spawnve_cwd(iprog, argv, env, 1,
 714                                         working_directory);
 715                                 free(iprog);
 716                         }
 717                         argv[0] = argv0;
 718                 }
 719                 else
 720                         pid = mingw_spawnve_cwd(prog, argv, env, 0,
 721                                 working_directory);
 722                 free(prog);
 723         }
 724         free_path_split(path);
 725         return pid;
 726 }
 727
 728 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env)
 729 {
 730         return mingw_spawnvpe_cwd(cmd, argv, env, NULL);
 731 }
 732
 733 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 734 {
 735         const char *interpr = parse_interpreter(cmd);
 736         char **path;
 737         char *prog;
 738         int pid = 0;
 739
 740         if (!interpr)
 741                 return 0;
 742         path = get_path_split(env);
 743         prog = path_lookup(interpr, path, 1);
 744         if (prog) {
 745                 int argc = 0;
 746                 const char **argv2;
 747                 while (argv[argc]) argc++;
 748                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
 749                 argv2[0] = (char *)cmd; /* full path to the script file */
 750                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 751                 pid = mingw_spawnve(prog, argv2, env, 1);
 752                 if (pid >= 0) {
 753                         int status;
 754                         if (waitpid(pid, &status, 0) < 0)
 755                                 status = 255;
 756                         exit(status);
 757                 }
 758                 pid = 1;        /* indicate that we tried but failed */
 759                 free(prog);
 760                 free(argv2);
 761         }
 762         free_path_split(path);
 763         return pid;
 764 }
 765
 766 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 767 {
 768         /* check if git_command is a shell script */
 769         if (!try_shell_exec(cmd, argv, (char **)env)) {
 770                 int pid, status;
 771
 772                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 773                 if (pid < 0)
 774                         return;
 775                 if (waitpid(pid, &status, 0) < 0)
 776                         status = 255;
 777                 exit(status);
 778         }
 779 }
 780
 781 void mingw_execvp(const char *cmd, char *const *argv)
 782 {
 783         char **path = get_path_split(NULL);
 784         char *prog = path_lookup(cmd, path, 0);
 785
 786         if (prog) {
 787                 mingw_execve(prog, argv, environ);
 788                 free(prog);
 789         } else
 790                 errno = ENOENT;
 791
 792         free_path_split(path);
 793 }
 794
 795 char **copy_environ()
 796 {
 797         char **env;
 798         int i = 0;
 799         while (environ[i])
 800                 i++;
 801         env = xmalloc((i+1)*sizeof(*env));
 802         for (i = 0; environ[i]; i++)
 803                 env[i] = xstrdup(environ[i]);
 804         env[i] = NULL;
 805         return env;
 806 }
 807
 808 void free_environ(char **env)
 809 {
 810         int i;
 811         for (i = 0; env[i]; i++)
 812                 free(env[i]);
 813         free(env);
 814 }
 815
 816 static int lookup_env(char **env, const char *name, size_t nmln)
 817 {
 818         int i;
 819
 820         for (i = 0; env[i]; i++) {
 821                 if (0 == strncmp(env[i], name, nmln)
 822                     && '=' == env[i][nmln])
 823                         /* matches */
 824                         return i;
 825         }
 826         return -1;
 827 }
 828
 829 /*
 830  * If name contains '=', then sets the variable, otherwise it unsets it
 831  */
 832 char **env_setenv(char **env, const char *name)
 833 {
 834         char *eq = strchrnul(name, '=');
 835         int i = lookup_env(env, name, eq-name);
 836
 837         if (i < 0) {
 838                 if (*eq) {
 839                         for (i = 0; env[i]; i++)
 840                                 ;
 841                         env = xrealloc(env, (i+2)*sizeof(*env));
 842                         env[i] = xstrdup(name);
 843                         env[i+1] = NULL;
 844                 }
 845         }
 846         else {
 847                 free(env[i]);
 848                 if (*eq)
 849                         env[i] = xstrdup(name);
 850                 else
 851                         for (; env[i]; i++)
 852                                 env[i] = env[i+1];
 853         }
 854         return env;
 855 }
 856
 857 /* this is the first function to call into WS_32; initialize it */
 858 #undef gethostbyname
 859 struct hostent *mingw_gethostbyname(const char *host)
 860 {
 861         WSADATA wsa;
 862
 863         if (WSAStartup(MAKEWORD(2,2), &wsa))
 864                 die("unable to initialize winsock subsystem, error %d",
 865                         WSAGetLastError());
 866         atexit((void(*)(void)) WSACleanup);
 867         return gethostbyname(host);
 868 }
 869
 870 int mingw_socket(int domain, int type, int protocol)
 871 {
 872         int sockfd;
 873         SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
 874         if (s == INVALID_SOCKET) {
 875                 /*
 876                  * WSAGetLastError() values are regular BSD error codes
 877                  * biased by WSABASEERR.
 878                  * However, strerror() does not know about networking
 879                  * specific errors, which are values beginning at 38 or so.
 880                  * Therefore, we choose to leave the biased error code
 881                  * in errno so that _if_ someone looks up the code somewhere,
 882                  * then it is at least the number that are usually listed.
 883                  */
 884                 errno = WSAGetLastError();
 885                 return -1;
 886         }
 887         /* convert into a file descriptor */
 888         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
 889                 closesocket(s);
 890                 return error("unable to make a socket file descriptor: %s",
 891                         strerror(errno));
 892         }
 893         return sockfd;
 894 }
 895
 896 #undef connect
 897 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
 898 {
 899         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
 900         return connect(s, sa, sz);
 901 }
 902
 903 #undef rename
 904 int mingw_rename(const char *pold, const char *pnew)
 905 {
 906         /*
 907          * Try native rename() first to get errno right.
 908          * It is based on MoveFile(), which cannot overwrite existing files.
 909          */
 910         if (!rename(pold, pnew))
 911                 return 0;
 912         if (errno != EEXIST)
 913                 return -1;
 914         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
 915                 return 0;
 916         /* TODO: translate more errors */
 917         if (GetLastError() == ERROR_ACCESS_DENIED) {
 918                 DWORD attrs = GetFileAttributes(pnew);
 919                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY)) {
 920                         errno = EISDIR;
 921                         return -1;
 922                 }
 923         }
 924         errno = EACCES;
 925         return -1;
 926 }
 927
 928 struct passwd *getpwuid(int uid)
 929 {
 930         static char user_name[100];
 931         static struct passwd p;
 932
 933         DWORD len = sizeof(user_name);
 934         if (!GetUserName(user_name, &len))
 935                 return NULL;
 936         p.pw_name = user_name;
 937         p.pw_gecos = "unknown";
 938         p.pw_dir = NULL;
 939         return &p;
 940 }
 941
 942 static HANDLE timer_event;
 943 static HANDLE timer_thread;
 944 static int timer_interval;
 945 static int one_shot;
 946 static sig_handler_t timer_fn = SIG_DFL;
 947
 948 /* The timer works like this:
 949  * The thread, ticktack(), is a trivial routine that most of the time
 950  * only waits to receive the signal to terminate. The main thread tells
 951  * the thread to terminate by setting the timer_event to the signalled
 952  * state.
 953  * But ticktack() interrupts the wait state after the timer's interval
 954  * length to call the signal handler.
 955  */
 956
 957 static unsigned __stdcall ticktack(void *dummy)
 958 {
 959         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
 960                 if (timer_fn == SIG_DFL)
 961                         die("Alarm");
 962                 if (timer_fn != SIG_IGN)
 963                         timer_fn(SIGALRM);
 964                 if (one_shot)
 965                         break;
 966         }
 967         return 0;
 968 }
 969
 970 static int start_timer_thread(void)
 971 {
 972         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
 973         if (timer_event) {
 974                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
 975                 if (!timer_thread )
 976                         return errno = ENOMEM,
 977                                 error("cannot start timer thread");
 978         } else
 979                 return errno = ENOMEM,
 980                         error("cannot allocate resources for timer");
 981         return 0;
 982 }
 983
 984 static void stop_timer_thread(void)
 985 {
 986         if (timer_event)
 987                 SetEvent(timer_event);  /* tell thread to terminate */
 988         if (timer_thread) {
 989                 int rc = WaitForSingleObject(timer_thread, 1000);
 990                 if (rc == WAIT_TIMEOUT)
 991                         error("timer thread did not terminate timely");
 992                 else if (rc != WAIT_OBJECT_0)
 993                         error("waiting for timer thread failed: %lu",
 994                               GetLastError());
 995                 CloseHandle(timer_thread);
 996         }
 997         if (timer_event)
 998                 CloseHandle(timer_event);
 999         timer_event = NULL;
1000         timer_thread = NULL;
1001 }
1002
1003 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1004 {
1005         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1006 }
1007
1008 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1009 {
1010         static const struct timeval zero;
1011         static int atexit_done;
1012
1013         if (out != NULL)
1014                 return errno = EINVAL,
1015                         error("setitimer param 3 != NULL not implemented");
1016         if (!is_timeval_eq(&in->it_interval, &zero) &&
1017             !is_timeval_eq(&in->it_interval, &in->it_value))
1018                 return errno = EINVAL,
1019                         error("setitimer: it_interval must be zero or eq it_value");
1020
1021         if (timer_thread)
1022                 stop_timer_thread();
1023
1024         if (is_timeval_eq(&in->it_value, &zero) &&
1025             is_timeval_eq(&in->it_interval, &zero))
1026                 return 0;
1027
1028         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1029         one_shot = is_timeval_eq(&in->it_interval, &zero);
1030         if (!atexit_done) {
1031                 atexit(stop_timer_thread);
1032                 atexit_done = 1;
1033         }
1034         return start_timer_thread();
1035 }
1036
1037 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1038 {
1039         if (sig != SIGALRM)
1040                 return errno = EINVAL,
1041                         error("sigaction only implemented for SIGALRM");
1042         if (out != NULL)
1043                 return errno = EINVAL,
1044                         error("sigaction: param 3 != NULL not implemented");
1045
1046         timer_fn = in->sa_handler;
1047         return 0;
1048 }
1049
1050 #undef signal
1051 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1052 {
1053         sig_handler_t old;
1054
1055         if (sig != SIGALRM)
1056                 return signal(sig, handler);
1057         old = timer_fn;
1058         timer_fn = handler;
1059         return old;
1060 }
1061
1062 static const char *make_backslash_path(const char *path)
1063 {
1064         static char buf[PATH_MAX + 1];
1065         char *c;
1066
1067         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1068                 die("Too long path: %.*s", 60, path);
1069
1070         for (c = buf; *c; c++) {
1071                 if (*c == '/')
1072                         *c = '\\';
1073         }
1074         return buf;
1075 }
1076
1077 void mingw_open_html(const char *unixpath)
1078 {
1079         const char *htmlpath = make_backslash_path(unixpath);
1080         printf("Launching default browser to display HTML ...\n");
1081         ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1082 }