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 ); /* System V / 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'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
R sigpause ()
returns, it was interrupted by a signal and the return value is -1
with
errno
set to
R EINTR .
CONFORMING TO
The System V version of
R 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
R 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
R 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
R _POSIX_SOURCE ,
R _POSIX_C_SOURCE ,
R _XOPEN_SOURCE ,
R _GNU_SOURCE ,
or
_SVID_SOURCE
is defined.
The System V version is used if
_XOPEN_SOURCE
is defined.
SEE ALSO
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