NAME
sigpause - atomically release blocked signals and wait for interrupt
SYNOPSIS
#include <signal.h>
I int sigpause(int sigmask ); /* BSD */
I int sigpause(int sig ); /* Unix95 */
DESCRIPTION
Don't use this function. Use
sigsuspend(2)
instead.
The function
R sigpause ()
is designed to wait for some signal.
It changes the process' 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
R sigpause ()
returns, it was interrupted by a signal and the return value is -1
with
errno
set to
R EINTR .
HISTORY
The classical BSD version of this function appeared in 4.2BSD.
It sets the process' signal mask to
R sigmask .
When the number of signals was increased above 32, this version
was replaced by the incompatible Unix95 one, 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
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