sigpause — atomically release blocked signals and wait for interrupt
#include <signal.h>
int
sigpause( |
int | sigmask); |
/* BSD */
int
sigpause( |
int | sig); |
/* System V / Unix95 */
Don't use this function. Use sigsuspend(2) instead.
The function sigpause() is
designed to wait for some signal. It changes the process's
signal mask (set of blocked signals), and then waits for a
signal to arrive. Upon arrival of a signal, the original
signal mask is restored.
If sigpause() returns, it
was interrupted by a signal and the return value is −1
with errno set to EINTR.
The classical BSD version of this function appeared in
4.2BSD. It sets the process's signal mask to sigmask. Unix95 standardized
the incompatible System V version of this function, which
removes only the specified signal sig from the process's signal
mask. The unfortunate situation with two incompatible
functions with the same name was solved by the sigsuspend(2) function,
that takes a sigset_t
* parameter (instead of an int).
On Linux, this routine is a system call only on the Sparc (sparc64) architecture.
Libc4 and libc5 only know about the BSD version.
Glibc uses the BSD version if the _BSD_SOURCE feature test macro is defined
and none of _POSIX_SOURCE,
_POSIX_C_SOURCE, _XOPEN_SOURCE, _GNU_SOURCE, or _SVID_SOURCE is defined. The System V
version is used if _XOPEN_SOURCE is defined.
kill(2), sigaction(2), sigprocmask(2), sigsuspend(2), sigblock(3), sigvec(3), feature_test_macros(7)
This page is part of release 2.79 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man-pages/.
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Copyright (C) 2004 Andries Brouwer (aebcwi.nl) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. |