Commit | Line | Data |
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bb0cfa24 | 1 | /* |
dc51c380 KB |
2 | * Copyright (c) 1989 The Regents of the University of California. |
3 | * All rights reserved. | |
4 | * | |
269a7923 | 5 | * %sccs.include.redist.c% |
bb0cfa24 DF |
6 | */ |
7 | ||
2ce81398 | 8 | #if defined(LIBC_SCCS) && !defined(lint) |
c5980113 | 9 | static char sccsid[] = "@(#)sleep.c 5.6 (Berkeley) %G%"; |
dc51c380 | 10 | #endif /* LIBC_SCCS and not lint */ |
fa95c6ae | 11 | |
455b164d | 12 | #include <sys/time.h> |
dc51c380 | 13 | #include <sys/signal.h> |
c5980113 | 14 | #include <unistd.h> |
cc749e07 | 15 | |
fa95c6ae SL |
16 | #define setvec(vec, a) \ |
17 | vec.sv_handler = a; vec.sv_mask = vec.sv_onstack = 0 | |
18 | ||
e15ec383 MK |
19 | static int ringring; |
20 | ||
c5980113 | 21 | unsigned int |
dc51c380 KB |
22 | sleep(seconds) |
23 | unsigned int seconds; | |
cc749e07 | 24 | { |
dc51c380 | 25 | register struct itimerval *itp; |
fa95c6ae | 26 | struct itimerval itv, oitv; |
fa95c6ae | 27 | struct sigvec vec, ovec; |
dc51c380 | 28 | long omask; |
c5980113 | 29 | static void sleephandler(); |
cc749e07 | 30 | |
dc51c380 KB |
31 | itp = &itv; |
32 | if (!seconds) | |
c5980113 | 33 | return 0; |
fa95c6ae SL |
34 | timerclear(&itp->it_interval); |
35 | timerclear(&itp->it_value); | |
36 | if (setitimer(ITIMER_REAL, itp, &oitv) < 0) | |
c5980113 | 37 | return seconds; |
dc51c380 | 38 | itp->it_value.tv_sec = seconds; |
fa95c6ae SL |
39 | if (timerisset(&oitv.it_value)) { |
40 | if (timercmp(&oitv.it_value, &itp->it_value, >)) | |
41 | oitv.it_value.tv_sec -= itp->it_value.tv_sec; | |
cc749e07 | 42 | else { |
fa95c6ae SL |
43 | itp->it_value = oitv.it_value; |
44 | /* | |
dc51c380 KB |
45 | * This is a hack, but we must have time to return |
46 | * from the setitimer after the alarm or else it'll | |
47 | * be restarted. And, anyway, sleep never did | |
48 | * anything more than this before. | |
fa95c6ae | 49 | */ |
a883f51a SL |
50 | oitv.it_value.tv_sec = 1; |
51 | oitv.it_value.tv_usec = 0; | |
cc749e07 BJ |
52 | } |
53 | } | |
dc51c380 | 54 | setvec(vec, sleephandler); |
fa95c6ae | 55 | (void) sigvec(SIGALRM, &vec, &ovec); |
1c9de88b | 56 | omask = sigblock(sigmask(SIGALRM)); |
e15ec383 | 57 | ringring = 0; |
b34945c3 | 58 | (void) setitimer(ITIMER_REAL, itp, (struct itimerval *)0); |
e15ec383 | 59 | while (!ringring) |
1c9de88b | 60 | sigpause(omask &~ sigmask(SIGALRM)); |
e15ec383 | 61 | (void) sigvec(SIGALRM, &ovec, (struct sigvec *)0); |
1c9de88b | 62 | (void) sigsetmask(omask); |
e15ec383 | 63 | (void) setitimer(ITIMER_REAL, &oitv, (struct itimerval *)0); |
c5980113 | 64 | return 0; |
cc749e07 BJ |
65 | } |
66 | ||
dc51c380 KB |
67 | static void |
68 | sleephandler() | |
cc749e07 | 69 | { |
e15ec383 | 70 | ringring = 1; |
cc749e07 | 71 | } |