SIGPAUSE
Section: Linux Programmer's Manual (3)
Updated: 2017-09-15
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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
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
sigpause()
| Thread safety | MT-Safe
|
CONFORMING TO
The System V version of
sigpause()
is standardized in POSIX.1-2001.
It is also specified in POSIX.1-2008, where it is marked obsolete.
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 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.
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 version is used,
and feature test macros must be defined as follows to obtain the declaration:
- *
-
Since glibc 2.26:
_XOPEN_SOURCE >= 500
- *
-
Glibc 2.25 and earlier: _XOPEN_SOURCE
Since glibc 2.19, only the System V version is exposed by
<signal.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 4.13 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
https://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ATTRIBUTES
-
- CONFORMING TO
-
- NOTES
-
- History
-
- Linux notes
-
- SEE ALSO
-
- COLOPHON
-
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