Return to ualarm.c CVS log

Up to [CSRG BSD Unix] / 43BSDReno / lib / libc / gen

Annotation of 43BSDReno/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.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted
                      6:  * provided that: (1) source distributions retain this entire copyright
                      7:  * notice and comment, and (2) distributions including binaries display
                      8:  * the following acknowledgement:  ``This product includes software
                      9:  * developed by the University of California, Berkeley and its contributors''
                     10:  * in the documentation or other materials provided with the distribution
                     11:  * and in all advertising materials mentioning features or use of this
                     12:  * software. Neither the name of the University nor the names of its
                     13:  * contributors may be used to endorse or promote products derived
                     14:  * from this software without specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  */
                     19: 
                     20: #if defined(LIBC_SCCS) && !defined(lint)
                     21: static char sccsid[] = "@(#)ualarm.c   5.4 (Berkeley) 6/1/90";
                     22: #endif /* LIBC_SCCS and not lint */
                     23: 
                     24: #include <sys/time.h>
                     25: 
                     26: #define        USPS    1000000         /* # of microseconds in a second */
                     27: 
                     28: /*
                     29:  * Generate a SIGALRM signal in ``usecs'' microseconds.
                     30:  * If ``reload'' is non-zero, keep generating SIGALRM
                     31:  * every ``reload'' microseconds after the first signal.
                     32:  */
                     33: unsigned
                     34: ualarm(usecs, reload)
                     35:        register unsigned usecs;
                     36:        register unsigned reload;
                     37: {
                     38:        struct itimerval new, old;
                     39: 
                     40:        new.it_interval.tv_usec = reload % USPS;
                     41:        new.it_interval.tv_sec = reload / USPS;
                     42:        
                     43:        new.it_value.tv_usec = usecs % USPS;
                     44:        new.it_value.tv_sec = usecs / USPS;
                     45: 
                     46:        if (setitimer(ITIMER_REAL, &new, &old) == 0)
                     47:                return (old.it_value.tv_sec * USPS + old.it_value.tv_usec);
                     48:        /* else */
                     49:                return (-1);
                     50: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.