don't use setjmp/longjmp, or problems if an interrupt routine

[unix-history] / usr / src / lib / libc / gen / alarm.c

/*      alarm.c 4.1     83/06/10        */

/*
* Backwards compatible alarm.
*/
#include <sys/time.h>

alarm(secs)
       int secs;
{
       struct itimerval it, oitv;
       register struct itimerval *itp = &it;

       timerclear(&itp->it_interval);
       itp->it_value.tv_sec = secs;
       itp->it_value.tv_usec = 0;
       if (setitimer(ITIMER_REAL, itp, &oitv) < 0)
               return (-1);
       return (oitv.it_value.tv_sec);
}