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Annotation of src/lib/libc/gen/alarm.c, Revision 1.4.4.1

1.4.4.1 ! jtc         1: /*     $NetBSD: alarm.c,v 1.4 1995/02/25 15:39:04 cgd Exp $    */
1.4       cgd         2:
1.1       cgd         3: /*
1.4       cgd         4:  * Copyright (c) 1983, 1993
                      5:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd         6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. All advertising materials mentioning features or use of this software
                     16:  *    must display the following acknowledgement:
                     17:  *     This product includes software developed by the University of
                     18:  *     California, Berkeley and its contributors.
                     19:  * 4. Neither the name of the University nor the names of its contributors
                     20:  *    may be used to endorse or promote products derived from this software
                     21:  *    without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     33:  * SUCH DAMAGE.
                     34:  */
                     35:
                     36: #if defined(LIBC_SCCS) && !defined(lint)
1.4       cgd        37: #if 0
                     38: static char sccsid[] = "@(#)alarm.c    8.1 (Berkeley) 6/4/93";
                     39: #else
1.4.4.1 ! jtc        40: static char rcsid[] = "$NetBSD: alarm.c,v 1.4 1995/02/25 15:39:04 cgd Exp $";
1.4       cgd        41: #endif
1.1       cgd        42: #endif /* LIBC_SCCS and not lint */
                     43:
                     44: /*
                     45:  * Backwards compatible alarm.
                     46:  */
1.4.4.1 ! jtc        47: #include "namespace.h"
1.1       cgd        48: #include <sys/time.h>
                     49: #include <unistd.h>
1.4.4.1 ! jtc        50:
        !            51: #ifdef __weak_alias
        !            52: __weak_alias(alarm,_alarm);
        !            53: #endif
1.1       cgd        54:
                     55: unsigned int
                     56: alarm(secs)
                     57:        unsigned int secs;
                     58: {
                     59:        struct itimerval it, oitv;
                     60:        register struct itimerval *itp = &it;
                     61:
                     62:        timerclear(&itp->it_interval);
                     63:        itp->it_value.tv_sec = secs;
                     64:        itp->it_value.tv_usec = 0;
                     65:        if (setitimer(ITIMER_REAL, itp, &oitv) < 0)
                     66:                return (-1);
                     67:        if (oitv.it_value.tv_usec)
                     68:                oitv.it_value.tv_sec++;
                     69:        return (oitv.it_value.tv_sec);
                     70: }

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