mirror of https://github.com/mkerrisk/man-pages
84 lines
2.8 KiB
Groff
84 lines
2.8 KiB
Groff
.\" Copyright (C) 2004 Andries Brouwer (aeb@cwi.nl)
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.TH SIGPAUSE 2 2004-05-10 "Linux 2.6" "Linux Programmer's Manual"
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.SH NAME
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sigpause \- atomically release blocked signals and wait for interrupt
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.SH SYNOPSIS
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.nf
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.B #include <signal.h>
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.sp
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.BI "int sigpause(int " sigmask "); /* BSD */"
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.sp
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.BI "int sigpause(int " sig "); /* Unix95 */"
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.fi
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.SH DESCRIPTION
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Don't use this function. Use
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.BR sigsuspend (2)
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instead.
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.LP
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The function
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.B sigpause
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is designed to wait for some signal.
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It changes the process' signal mask (set of blocked signals),
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and then waits for a signal to arrive.
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Upon arrival of a signal, the original signal mask is restored.
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.SH "RETURN VALUE"
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If
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.B sigpause
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returns, it was interrupted by a signal and the return value is \-1
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with
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.I errno
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set to
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.BR EINTR .
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.SH HISTORY
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The classical BSD version of this function appeared in 4.2BSD.
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It sets the process' signal mask to
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.IR sigmask .
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When the number of signals was increased above 32, this version
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was replaced by the incompatible Unix95 one, which removes only the
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specified signal
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.I sig
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from the process' signal mask.
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.\" __xpg_sigpause: Unix 95, spec 1170, SVID, SVR4, XPG
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The unfortunate situation with two incompatible functions with the
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same name was solved by the
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.BR \%sigsuspend (2)
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function, that takes a
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.B "sigset_t *"
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parameter (instead of an int).
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.LP
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On Linux, this routine is a system call only on the Sparc (sparc64)
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architecture. Libc4 and libc5 only know about the BSD version.
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Glibc uses the BSD version unless _XOPEN_SOURCE is defined.
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.\" .SH NOTE
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.\" For the BSD version, one usually uses a zero
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.\" .I sigmask
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.\" to indicate that no signals are to be blocked.
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.SH "SEE ALSO"
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.BR kill (2),
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.BR sigaction (2),
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.BR sigblock (2),
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.BR sigprocmask (2),
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.BR sigsuspend (2),
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.BR sigvec (2)
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