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 |
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 _XOPEN_SOURCE must be
defined to obtain the declaration). 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).
COLOPHON¶
This page is part of release 4.10 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/.