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Speccy ClassiX 1998
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ixemulsrc.lha
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ixemul-41.4
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sleep.c
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1994-08-21
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/*
* 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;
static 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;
}