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- 1.1
- date 92.06.08.18.31.20; author mwild; state Exp;
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- @initial checkin
- @
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- 1.1
- log
- @Initial revision
- @
- text
- @/*
- * Copyright (c) 1989 The Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms are permitted
- * provided that: (1) source distributions retain this entire copyright
- * notice and comment, and (2) distributions including binaries display
- * the following acknowledgement: ``This product includes software
- * developed by the University of California, Berkeley and its contributors''
- * in the documentation or other materials provided with the distribution
- * and in all advertising materials mentioning features or use of this
- * software. Neither the name of the University nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
- */
-
- #if defined(LIBC_SCCS) && !defined(lint)
- static char sccsid[] = "@@(#)sleep.c 5.5 (Berkeley) 6/1/90";
- #endif /* LIBC_SCCS and not lint */
-
- #define KERNEL
- #include "ixemul.h"
- #include <sys/time.h>
-
- #define setvec(vec, a) \
- vec.sv_handler = a; vec.sv_mask = vec.sv_onstack = 0
-
- #define ringring u.u_ringring
-
- int
- sleep(unsigned int seconds)
- {
- register struct itimerval *itp;
- struct itimerval itv, oitv;
- struct sigvec vec, ovec;
- long omask;
- void sleephandler();
-
- itp = &itv;
- if (!seconds)
- return -1;
- timerclear(&itp->it_interval);
- timerclear(&itp->it_value);
- if (syscall (SYS_setitimer, ITIMER_REAL, itp, &oitv) < 0)
- return -1;
- itp->it_value.tv_sec = seconds;
- if (timerisset(&oitv.it_value)) {
- if (timercmp(&oitv.it_value, &itp->it_value, >))
- oitv.it_value.tv_sec -= itp->it_value.tv_sec;
- else {
- itp->it_value = oitv.it_value;
- /*
- * This is a hack, but we must have time to return
- * from the setitimer after the alarm or else it'll
- * be restarted. And, anyway, sleep never did
- * anything more than this before.
- */
- oitv.it_value.tv_sec = 1;
- oitv.it_value.tv_usec = 0;
- }
- }
- setvec(vec, sleephandler);
- (void) syscall (SYS_sigvec, SIGALRM, &vec, &ovec);
- omask = syscall (SYS_sigblock, sigmask(SIGALRM));
- ringring = 0;
- (void) syscall (SYS_setitimer, ITIMER_REAL, itp, (struct itimerval *)0);
- while (!ringring)
- syscall (SYS_sigpause, omask &~ sigmask(SIGALRM));
- (void) syscall (SYS_sigvec, SIGALRM, &ovec, (struct sigvec *)0);
- (void) syscall (SYS_sigsetmask, omask);
- (void) syscall (SYS_setitimer, ITIMER_REAL, &oitv, (struct itimerval *)0);
- }
-
- static void
- sleephandler()
- {
- ringring = 1;
- }
- @
-