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      1 /*
      2  * Like select(2) but set the signals to block while waiting in
      3  * select.  This version is not entirely race condition safe. Only
      4  * operating system support can make it so.
      5  */
      6 
      7 #include <config.h>
      8 
      9 #include <sys/time.h>
     10 #include <sys/types.h>
     11 #ifdef HAVE_SYS_SELECT_H
     12 #include <sys/select.h>
     13 #endif
     14 #include <unistd.h>
     15 #include <signal.h>
     16 
     17 int
     18 pselect (int n,
     19 	 fd_set *readfds,
     20 	 fd_set *writefds,
     21 	 fd_set *exceptfds,
     22 	 const struct timespec *timeout,
     23 	 const sigset_t *sigmask)
     24 {
     25 	int result;
     26 	sigset_t saved_sigmask;
     27 	struct timeval saved_timeout;
     28 
     29 	if (sigmask && sigprocmask(SIG_SETMASK, sigmask, &saved_sigmask) == -1)
     30 		return -1;
     31 
     32 	if (timeout) {
     33 		saved_timeout.tv_sec = timeout->tv_sec;
     34 		saved_timeout.tv_usec = timeout->tv_nsec / 1000;
     35 		result = select(n, readfds, writefds, exceptfds, &saved_timeout);
     36 	} else {
     37 		result = select(n, readfds, writefds, exceptfds, NULL);
     38 	}
     39 
     40 	if (sigmask && sigprocmask(SIG_SETMASK, &saved_sigmask, NULL) == -1)
     41 		return -1;
     42 
     43 	return result;
     44 }
     45