121360Sdist /* 2*39169Sbostic * Copyright (c) 1989 The Regents of the University of California. 3*39169Sbostic * All rights reserved. 4*39169Sbostic * 5*39169Sbostic * Redistribution and use in source and binary forms are permitted 6*39169Sbostic * provided that the above copyright notice and this paragraph are 7*39169Sbostic * duplicated in all such forms and that any documentation, 8*39169Sbostic * advertising materials, and other materials related to such 9*39169Sbostic * distribution and use acknowledge that the software was developed 10*39169Sbostic * by the University of California, Berkeley. The name of the 11*39169Sbostic * University may not be used to endorse or promote products derived 12*39169Sbostic * from this software without specific prior written permission. 13*39169Sbostic * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14*39169Sbostic * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15*39169Sbostic * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 1621360Sdist */ 1721360Sdist 1826593Sdonn #if defined(LIBC_SCCS) && !defined(lint) 19*39169Sbostic static char sccsid[] = "@(#)sleep.c 5.4 (Berkeley) 09/18/89"; 20*39169Sbostic #endif /* LIBC_SCCS and not lint */ 2112977Ssam 2213582Ssam #include <sys/time.h> 23*39169Sbostic #include <sys/signal.h> 241979Swnj 2512977Ssam #define setvec(vec, a) \ 2612977Ssam vec.sv_handler = a; vec.sv_mask = vec.sv_onstack = 0 2712977Ssam 2814618Skarels static int ringring; 2914618Skarels 30*39169Sbostic sleep(seconds) 31*39169Sbostic unsigned int seconds; 321979Swnj { 33*39169Sbostic register struct itimerval *itp; 3412977Ssam struct itimerval itv, oitv; 3512977Ssam struct sigvec vec, ovec; 36*39169Sbostic long omask; 37*39169Sbostic void sleephandler(); 381979Swnj 39*39169Sbostic itp = &itv; 40*39169Sbostic if (!seconds) 411979Swnj return; 4212977Ssam timerclear(&itp->it_interval); 4312977Ssam timerclear(&itp->it_value); 4412977Ssam if (setitimer(ITIMER_REAL, itp, &oitv) < 0) 4512977Ssam return; 46*39169Sbostic itp->it_value.tv_sec = seconds; 4712977Ssam if (timerisset(&oitv.it_value)) { 4812977Ssam if (timercmp(&oitv.it_value, &itp->it_value, >)) 4912977Ssam oitv.it_value.tv_sec -= itp->it_value.tv_sec; 501979Swnj else { 5112977Ssam itp->it_value = oitv.it_value; 5212977Ssam /* 53*39169Sbostic * This is a hack, but we must have time to return 54*39169Sbostic * from the setitimer after the alarm or else it'll 55*39169Sbostic * be restarted. And, anyway, sleep never did 56*39169Sbostic * anything more than this before. 5712977Ssam */ 5813019Ssam oitv.it_value.tv_sec = 1; 5913019Ssam oitv.it_value.tv_usec = 0; 601979Swnj } 611979Swnj } 62*39169Sbostic setvec(vec, sleephandler); 6312977Ssam (void) sigvec(SIGALRM, &vec, &ovec); 6417491Skarels omask = sigblock(sigmask(SIGALRM)); 6514954Skarels ringring = 0; 6614618Skarels (void) setitimer(ITIMER_REAL, itp, (struct itimerval *)0); 6714618Skarels while (!ringring) 6817491Skarels sigpause(omask &~ sigmask(SIGALRM)); 6914618Skarels (void) sigvec(SIGALRM, &ovec, (struct sigvec *)0); 7017491Skarels (void) sigsetmask(omask); 7114618Skarels (void) setitimer(ITIMER_REAL, &oitv, (struct itimerval *)0); 721979Swnj } 731979Swnj 74*39169Sbostic static void 75*39169Sbostic sleephandler() 761979Swnj { 7714618Skarels ringring = 1; 781979Swnj } 79