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sigpause.3

SIGPAUSE

Section: Linux Programmer's Manual (3)
Updated: 2005-12-01
Index Return to Main Contents
 

NAME

sigpause - atomically release blocked signals and wait for interrupt  

SYNOPSIS

#include <signal.h>

int sigpause(int sigmask);  /* BSD */

int sigpause(int sig);      /* System V / Unix95 */
 

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.  

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. 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 * argument (instead of an int).  

Linux Notes

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.  

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 3.21 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/.


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
CONFORMING TO
NOTES
History
Linux Notes
SEE ALSO
COLOPHON

 

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