compat/mingw.c

   1 #include "../git-compat-util.h"
   2
   3 unsigned int _CRT_fmode = _O_BINARY;
   4
   5 #undef open
   6 int mingw_open (const char *filename, int oflags, ...)
   7 {
   8         va_list args;
   9         unsigned mode;
  10         va_start(args, oflags);
  11         mode = va_arg(args, int);
  12         va_end(args);
  13
  14         if (!strcmp(filename, "/dev/null"))
  15                 filename = "nul";
  16         int fd = open(filename, oflags, mode);
  17         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
  18                 DWORD attrs = GetFileAttributes(filename);
  19                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
  20                         errno = EISDIR;
  21         }
  22         return fd;
  23 }
  24
  25 unsigned int sleep (unsigned int seconds)
  26 {
  27         Sleep(seconds*1000);
  28         return 0;
  29 }
  30
  31 int mkstemp(char *template)
  32 {
  33         char *filename = mktemp(template);
  34         if (filename == NULL)
  35                 return -1;
  36         return open(filename, O_RDWR | O_CREAT, 0600);
  37 }
  38
  39 int gettimeofday(struct timeval *tv, void *tz)
  40 {
  41         SYSTEMTIME st;
  42         struct tm tm;
  43         GetSystemTime(&st);
  44         tm.tm_year = st.wYear-1900;
  45         tm.tm_mon = st.wMonth-1;
  46         tm.tm_mday = st.wDay;
  47         tm.tm_hour = st.wHour;
  48         tm.tm_min = st.wMinute;
  49         tm.tm_sec = st.wSecond;
  50         tv->tv_sec = tm_to_time_t(&tm);
  51         if (tv->tv_sec < 0)
  52                 return -1;
  53         tv->tv_usec = st.wMilliseconds*1000;
  54         return 0;
  55 }
  56
  57 int pipe(int filedes[2])
  58 {
  59         int fd;
  60         HANDLE h[2], parent;
  61
  62         if (_pipe(filedes, 8192, 0) < 0)
  63                 return -1;
  64
  65         parent = GetCurrentProcess();
  66
  67         if (!DuplicateHandle (parent, (HANDLE)_get_osfhandle(filedes[0]),
  68                         parent, &h[0], 0, FALSE, DUPLICATE_SAME_ACCESS)) {
  69                 close(filedes[0]);
  70                 close(filedes[1]);
  71                 return -1;
  72         }
  73         if (!DuplicateHandle (parent, (HANDLE)_get_osfhandle(filedes[1]),
  74                         parent, &h[1], 0, FALSE, DUPLICATE_SAME_ACCESS)) {
  75                 close(filedes[0]);
  76                 close(filedes[1]);
  77                 CloseHandle(h[0]);
  78                 return -1;
  79         }
  80         fd = _open_osfhandle((int)h[0], O_NOINHERIT);
  81         if (fd < 0) {
  82                 close(filedes[0]);
  83                 close(filedes[1]);
  84                 CloseHandle(h[0]);
  85                 CloseHandle(h[1]);
  86                 return -1;
  87         }
  88         close(filedes[0]);
  89         filedes[0] = fd;
  90         fd = _open_osfhandle((int)h[1], O_NOINHERIT);
  91         if (fd < 0) {
  92                 close(filedes[0]);
  93                 close(filedes[1]);
  94                 CloseHandle(h[1]);
  95                 return -1;
  96         }
  97         close(filedes[1]);
  98         filedes[1] = fd;
  99         return 0;
 100 }
 101
 102 int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 103 {
 104         return -1;
 105 }
 106
 107 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 108 {
 109         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 110         memcpy(result, gmtime(timep), sizeof(struct tm));
 111         return result;
 112 }
 113
 114 struct tm *localtime_r(const time_t *timep, struct tm *result)
 115 {
 116         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 117         memcpy(result, localtime(timep), sizeof(struct tm));
 118         return result;
 119 }
 120
 121 #undef getcwd
 122 char *mingw_getcwd(char *pointer, int len)
 123 {
 124         int i;
 125         char *ret = getcwd(pointer, len);
 126         if (!ret)
 127                 return ret;
 128         for (i = 0; pointer[i]; i++)
 129                 if (pointer[i] == '\\')
 130                         pointer[i] = '/';
 131         return ret;
 132 }
 133
 134 static const char *parse_interpreter(const char *cmd)
 135 {
 136         static char buf[100];
 137         char *p, *opt;
 138         int n, fd;
 139
 140         /* don't even try a .exe */
 141         n = strlen(cmd);
 142         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 143                 return NULL;
 144
 145         fd = open(cmd, O_RDONLY);
 146         if (fd < 0)
 147                 return NULL;
 148         n = read(fd, buf, sizeof(buf)-1);
 149         close(fd);
 150         if (n < 4)      /* at least '#!/x' and not error */
 151                 return NULL;
 152
 153         if (buf[0] != '#' || buf[1] != '!')
 154                 return NULL;
 155         buf[n] = '\0';
 156         p = strchr(buf, '\n');
 157         if (!p)
 158                 return NULL;
 159
 160         *p = '\0';
 161         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 162                 return NULL;
 163         /* strip options */
 164         if ((opt = strchr(p+1, ' ')))
 165                 *opt = '\0';
 166         return p+1;
 167 }
 168
 169 /*
 170  * Splits the PATH into parts.
 171  */
 172 static char **get_path_split(void)
 173 {
 174         char *p, **path, *envpath = getenv("PATH");
 175         int i, n = 0;
 176
 177         if (!envpath || !*envpath)
 178                 return NULL;
 179
 180         envpath = xstrdup(envpath);
 181         p = envpath;
 182         while (p) {
 183                 char *dir = p;
 184                 p = strchr(p, ';');
 185                 if (p) *p++ = '\0';
 186                 if (*dir) {     /* not earlier, catches series of ; */
 187                         ++n;
 188                 }
 189         }
 190         if (!n)
 191                 return NULL;
 192
 193         path = xmalloc((n+1)*sizeof(char*));
 194         p = envpath;
 195         i = 0;
 196         do {
 197                 if (*p)
 198                         path[i++] = xstrdup(p);
 199                 p = p+strlen(p)+1;
 200         } while (i < n);
 201         path[i] = NULL;
 202
 203         free(envpath);
 204
 205         return path;
 206 }
 207
 208 static void free_path_split(char **path)
 209 {
 210         if (!path)
 211                 return;
 212
 213         char **p = path;
 214         while (*p)
 215                 free(*p++);
 216         free(path);
 217 }
 218
 219 /*
 220  * exe_only means that we only want to detect .exe files, but not scripts
 221  * (which do not have an extension)
 222  */
 223 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 224 {
 225         char path[MAX_PATH];
 226         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 227
 228         if (!isexe && access(path, F_OK) == 0)
 229                 return xstrdup(path);
 230         path[strlen(path)-4] = '\0';
 231         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 232                 return xstrdup(path);
 233         return NULL;
 234 }
 235
 236 /*
 237  * Determines the absolute path of cmd using the the split path in path.
 238  * If cmd contains a slash or backslash, no lookup is performed.
 239  */
 240 static char *path_lookup(const char *cmd, char **path, int exe_only)
 241 {
 242         char *prog = NULL;
 243         int len = strlen(cmd);
 244         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 245
 246         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 247                 prog = xstrdup(cmd);
 248
 249         while (!prog && *path)
 250                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 251
 252         return prog;
 253 }
 254
 255 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 256 {
 257         const char *interpr = parse_interpreter(cmd);
 258         char **path;
 259         char *prog;
 260         int pid = 0;
 261
 262         if (!interpr)
 263                 return 0;
 264         path = get_path_split();
 265         prog = path_lookup(interpr, path, 1);
 266         if (prog) {
 267                 int argc = 0;
 268                 const char **argv2;
 269                 while (argv[argc]) argc++;
 270                 argv2 = xmalloc(sizeof(*argv) * (argc+2));
 271                 argv2[0] = (char *)interpr;
 272                 argv2[1] = (char *)cmd; /* full path to the script file */
 273                 memcpy(&argv2[2], &argv[1], sizeof(*argv) * argc);
 274                 pid = spawnve(_P_NOWAIT, prog, argv2, (const char **)env);
 275                 if (pid >= 0) {
 276                         int status;
 277                         if (waitpid(pid, &status, 0) < 0)
 278                                 status = 255;
 279                         exit(status);
 280                 }
 281                 pid = 1;        /* indicate that we tried but failed */
 282                 free(prog);
 283                 free(argv2);
 284         }
 285         free_path_split(path);
 286         return pid;
 287 }
 288
 289 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 290 {
 291         /* check if git_command is a shell script */
 292         if (!try_shell_exec(cmd, argv, (char **)env)) {
 293                 int pid, status;
 294
 295                 pid = spawnve(_P_NOWAIT, cmd, (const char **)argv, (const char **)env);
 296                 if (pid < 0)
 297                         return;
 298                 if (waitpid(pid, &status, 0) < 0)
 299                         status = 255;
 300                 exit(status);
 301         }
 302 }
 303
 304 void mingw_execvp(const char *cmd, char *const *argv)
 305 {
 306         char **path = get_path_split();
 307         char *prog = path_lookup(cmd, path, 0);
 308
 309         if (prog) {
 310                 mingw_execve(prog, argv, environ);
 311                 free(prog);
 312         } else
 313                 errno = ENOENT;
 314
 315         free_path_split(path);
 316 }
 317
 318 #undef rename
 319 int mingw_rename(const char *pold, const char *pnew)
 320 {
 321         /*
 322          * Try native rename() first to get errno right.
 323          * It is based on MoveFile(), which cannot overwrite existing files.
 324          */
 325         if (!rename(pold, pnew))
 326                 return 0;
 327         if (errno != EEXIST)
 328                 return -1;
 329         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
 330                 return 0;
 331         /* TODO: translate more errors */
 332         if (GetLastError() == ERROR_ACCESS_DENIED) {
 333                 DWORD attrs = GetFileAttributes(pnew);
 334                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY)) {
 335                         errno = EISDIR;
 336                         return -1;
 337                 }
 338         }
 339         errno = EACCES;
 340         return -1;
 341 }
 342
 343 struct passwd *getpwuid(int uid)
 344 {
 345         static char user_name[100];
 346         static struct passwd p;
 347
 348         DWORD len = sizeof(user_name);
 349         if (!GetUserName(user_name, &len))
 350                 return NULL;
 351         p.pw_name = user_name;
 352         p.pw_gecos = "unknown";
 353         p.pw_dir = NULL;
 354         return &p;
 355 }
 356
 357 static HANDLE timer_event;
 358 static HANDLE timer_thread;
 359 static int timer_interval;
 360 static int one_shot;
 361 static sig_handler_t timer_fn = SIG_DFL;
 362
 363 /* The timer works like this:
 364  * The thread, ticktack(), is a trivial routine that most of the time
 365  * only waits to receive the signal to terminate. The main thread tells
 366  * the thread to terminate by setting the timer_event to the signalled
 367  * state.
 368  * But ticktack() interrupts the wait state after the timer's interval
 369  * length to call the signal handler.
 370  */
 371
 372 static __stdcall unsigned ticktack(void *dummy)
 373 {
 374         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
 375                 if (timer_fn == SIG_DFL)
 376                         die("Alarm");
 377                 if (timer_fn != SIG_IGN)
 378                         timer_fn(SIGALRM);
 379                 if (one_shot)
 380                         break;
 381         }
 382         return 0;
 383 }
 384
 385 static int start_timer_thread(void)
 386 {
 387         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
 388         if (timer_event) {
 389                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
 390                 if (!timer_thread )
 391                         return errno = ENOMEM,
 392                                 error("cannot start timer thread");
 393         } else
 394                 return errno = ENOMEM,
 395                         error("cannot allocate resources for timer");
 396         return 0;
 397 }
 398
 399 static void stop_timer_thread(void)
 400 {
 401         if (timer_event)
 402                 SetEvent(timer_event);  /* tell thread to terminate */
 403         if (timer_thread) {
 404                 int rc = WaitForSingleObject(timer_thread, 1000);
 405                 if (rc == WAIT_TIMEOUT)
 406                         error("timer thread did not terminate timely");
 407                 else if (rc != WAIT_OBJECT_0)
 408                         error("waiting for timer thread failed: %lu",
 409                               GetLastError());
 410                 CloseHandle(timer_thread);
 411         }
 412         if (timer_event)
 413                 CloseHandle(timer_event);
 414         timer_event = NULL;
 415         timer_thread = NULL;
 416 }
 417
 418 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
 419 {
 420         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
 421 }
 422
 423 int setitimer(int type, struct itimerval *in, struct itimerval *out)
 424 {
 425         static const struct timeval zero;
 426         static int atexit_done;
 427
 428         if (out != NULL)
 429                 return errno = EINVAL,
 430                         error("setitimer param 3 != NULL not implemented");
 431         if (!is_timeval_eq(&in->it_interval, &zero) &&
 432             !is_timeval_eq(&in->it_interval, &in->it_value))
 433                 return errno = EINVAL,
 434                         error("setitimer: it_interval must be zero or eq it_value");
 435
 436         if (timer_thread)
 437                 stop_timer_thread();
 438
 439         if (is_timeval_eq(&in->it_value, &zero) &&
 440             is_timeval_eq(&in->it_interval, &zero))
 441                 return 0;
 442
 443         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
 444         one_shot = is_timeval_eq(&in->it_interval, &zero);
 445         if (!atexit_done) {
 446                 atexit(stop_timer_thread);
 447                 atexit_done = 1;
 448         }
 449         return start_timer_thread();
 450 }
 451
 452 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
 453 {
 454         if (sig != SIGALRM)
 455                 return errno = EINVAL,
 456                         error("sigaction only implemented for SIGALRM");
 457         if (out != NULL)
 458                 return errno = EINVAL,
 459                         error("sigaction: param 3 != NULL not implemented");
 460
 461         timer_fn = in->sa_handler;
 462         return 0;
 463 }
 464
 465 #undef signal
 466 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
 467 {
 468         if (sig != SIGALRM)
 469                 return signal(sig, handler);
 470         sig_handler_t old = timer_fn;
 471         timer_fn = handler;
 472         return old;
 473 }