SIGPAUSE

Section: Linux Programmer's Manual (3)
Updated: 2005-12-01
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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.  

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' 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 unless _XOPEN_SOURCE is defined.  

SEE ALSO

kill(2), sigaction(2), sigprocmask(2), sigsuspend(2), sigblock(3), sigvec(3)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
HISTORY
SEE ALSO

linux.jgfs.net manual pages