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Annotation of 43BSD/lib/libc/gen/ualarm.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1985 Regents of the University of California.
                      3:  * All rights reserved.  The Berkeley software License Agreement
                      4:  * specifies the terms and conditions for redistribution.
                      5:  */
                      6: 
                      7: #if defined(LIBC_SCCS) && !defined(lint)
                      8: static char sccsid[] = "@(#)ualarm.c   5.2 (Berkeley) 3/9/86";
                      9: #endif LIBC_SCCS and not lint
                     10: 
                     11: #include <sys/time.h>
                     12: 
                     13: #define        USPS    1000000         /* # of microseconds in a second */
                     14: 
                     15: /*
                     16:  * Generate a SIGALRM signal in ``usecs'' microseconds.
                     17:  * If ``reload'' is non-zero, keep generating SIGALRM
                     18:  * every ``reload'' microseconds after the first signal.
                     19:  */
                     20: unsigned
                     21: ualarm(usecs, reload)
                     22:        register unsigned usecs;
                     23:        register unsigned reload;
                     24: {
                     25:        struct itimerval new, old;
                     26: 
                     27:        new.it_interval.tv_usec = reload % USPS;
                     28:        new.it_interval.tv_sec = reload / USPS;
                     29:        
                     30:        new.it_value.tv_usec = usecs % USPS;
                     31:        new.it_value.tv_sec = usecs / USPS;
                     32: 
                     33:        if (setitimer(ITIMER_REAL, &new, &old) == 0)
                     34:                return (old.it_value.tv_sec * USPS + old.it_value.tv_usec);
                     35:        /* else */
                     36:                return (-1);
                     37: }

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