79 lines
2.6 KiB
C
79 lines
2.6 KiB
C
/*
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* Copyright (c) 1989 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that: (1) source distributions retain this entire copyright
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* notice and comment, and (2) distributions including binaries display
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* the following acknowledgement: ``This product includes software
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* developed by the University of California, Berkeley and its contributors''
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* in the documentation or other materials provided with the distribution
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* and in all advertising materials mentioning features or use of this
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* software. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)sleep.c 5.5 (Berkeley) 6/1/90";
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#endif /* LIBC_SCCS and not lint */
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#define _KERNEL
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#include "ixemul.h"
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#include <sys/time.h>
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static void
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sleephandler_sleep(void)
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{
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usetup;
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u.u_ringring = 1;
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}
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u_int sleep(u_int seconds)
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{
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usetup;
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register struct itimerval *itp;
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struct itimerval itv, oitv;
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struct sigvec vec, ovec;
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long omask;
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itp = &itv;
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if (!seconds)
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return 0;
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timerclear(&itp->it_interval);
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timerclear(&itp->it_value);
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if (syscall (SYS_setitimer, ITIMER_REAL, itp, &oitv) < 0)
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return 0;
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itp->it_value.tv_sec = seconds;
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if (timerisset(&oitv.it_value)) {
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if (timercmp(&oitv.it_value, &itp->it_value, >))
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oitv.it_value.tv_sec -= itp->it_value.tv_sec;
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else {
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itp->it_value = oitv.it_value;
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/*
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* This is a hack, but we must have time to return
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* from the setitimer after the alarm or else it'll
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* be restarted. And, anyway, sleep never did
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* anything more than this before.
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*/
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oitv.it_value.tv_sec = 1;
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oitv.it_value.tv_usec = 0;
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}
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}
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vec.sv_handler = sleephandler_sleep;
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vec.sv_mask = vec.sv_onstack = 0;
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syscall (SYS_sigvec, SIGALRM, &vec, &ovec);
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omask = syscall (SYS_sigblock, sigmask(SIGALRM));
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u.u_ringring = 0;
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(void) syscall (SYS_setitimer, ITIMER_REAL, itp, (struct itimerval *)0);
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while (!u.u_ringring)
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syscall (SYS_sigpause, omask & ~sigmask(SIGALRM));
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(void) syscall (SYS_sigvec, SIGALRM, &ovec, (struct sigvec *)0);
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(void) syscall (SYS_sigsetmask, omask);
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(void) syscall (SYS_setitimer, ITIMER_REAL, &oitv, (struct itimerval *)0);
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return 0;
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}
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