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Annotation of 43BSDReno/lib/libc/gen/sleep.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1989 The 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[] = "@(#)sleep.c    5.5 (Berkeley) 6/1/90";
        !            22: #endif /* LIBC_SCCS and not lint */
        !            23: 
        !            24: #include <sys/time.h>
        !            25: #include <sys/signal.h>
        !            26: 
        !            27: #define        setvec(vec, a) \
        !            28:        vec.sv_handler = a; vec.sv_mask = vec.sv_onstack = 0
        !            29: 
        !            30: static int ringring;
        !            31: 
        !            32: sleep(seconds)
        !            33:        unsigned int seconds;
        !            34: {
        !            35:        register struct itimerval *itp;
        !            36:        struct itimerval itv, oitv;
        !            37:        struct sigvec vec, ovec;
        !            38:        long omask;
        !            39:        void sleephandler();
        !            40: 
        !            41:        itp = &itv;
        !            42:        if (!seconds)
        !            43:                return;
        !            44:        timerclear(&itp->it_interval);
        !            45:        timerclear(&itp->it_value);
        !            46:        if (setitimer(ITIMER_REAL, itp, &oitv) < 0)
        !            47:                return;
        !            48:        itp->it_value.tv_sec = seconds;
        !            49:        if (timerisset(&oitv.it_value)) {
        !            50:                if (timercmp(&oitv.it_value, &itp->it_value, >))
        !            51:                        oitv.it_value.tv_sec -= itp->it_value.tv_sec;
        !            52:                else {
        !            53:                        itp->it_value = oitv.it_value;
        !            54:                        /*
        !            55:                         * This is a hack, but we must have time to return
        !            56:                         * from the setitimer after the alarm or else it'll
        !            57:                         * be restarted.  And, anyway, sleep never did
        !            58:                         * anything more than this before.
        !            59:                         */
        !            60:                        oitv.it_value.tv_sec = 1;
        !            61:                        oitv.it_value.tv_usec = 0;
        !            62:                }
        !            63:        }
        !            64:        setvec(vec, sleephandler);
        !            65:        (void) sigvec(SIGALRM, &vec, &ovec);
        !            66:        omask = sigblock(sigmask(SIGALRM));
        !            67:        ringring = 0;
        !            68:        (void) setitimer(ITIMER_REAL, itp, (struct itimerval *)0);
        !            69:        while (!ringring)
        !            70:                sigpause(omask &~ sigmask(SIGALRM));
        !            71:        (void) sigvec(SIGALRM, &ovec, (struct sigvec *)0);
        !            72:        (void) sigsetmask(omask);
        !            73:        (void) setitimer(ITIMER_REAL, &oitv, (struct itimerval *)0);
        !            74: }
        !            75: 
        !            76: static void
        !            77: sleephandler()
        !            78: {
        !            79:        ringring = 1;
        !            80: }

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