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SIGPAUSE(3) Linux Programmer's Manual SIGPAUSE(3)
NAME
sigpause - atomically release blocked signals and wait for interrupt
SYNOPSIS
#include <signal.h>
int sigpause(int sigmask); /* BSD (but see NOTES) */
int sigpause(int sig); /* System V / UNIX 95 */
DESCRIPTION
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.
RETURN VALUE
If sigpause() returns, it was interrupted by a signal and the return
value is -1 with errno set to EINTR.
ATTRIBUTES
Multithreading (see pthreads(7))
The sigpause() function is thread-safe.
CONFORMING TO
The System V version of sigpause() is standardized in POSIX.1-2001.
NOTES
History
The classical BSD version of this function appeared in 4.2BSD. It sets
the process's signal mask to sigmask. UNIX 95 standardized the incom-
patible System V version of this function, which removes only the spec-
ified signal sig from the process's signal mask. The unfortunate situ-
ation with two incompatible functions with the same name was solved by
the sigsuspend(2) function, that takes a sigset_t * argument (instead
of an int).
Linux notes
On Linux, this routine is a system call only on the Sparc (sparc64)
architecture.
Libc4 and libc5 know only 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. Otherwise, the System V ver-
sion is used (and _XOPEN_SOURCE must be defined to obtain the declara-
tion). Since glibc 2.19, only the System V version is exposed by <sig-
nal.h>; applications that formerly used the BSD sigpause() should be
amended to use sigsuspend(2).
SEE ALSO
kill(2), sigaction(2), sigprocmask(2), sigsuspend(2), sigblock(3),
sigvec(3), feature_test_macros(7)
COLOPHON
This page is part of release 3.69 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
http://www.kernel.org/doc/man-pages/.
Linux 2014-01-07 SIGPAUSE(3)
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