SIGPENDING(2)

NAME
sigpending - examine pending signals

SYNOPSIS
#include <signal.h>

int sigpending(sigset_t *set);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

sigpending(): _POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_SOURCE

DESCRIPTION

sigpending() returns the set of signals that are pending for delivery to the calling thread (i.e., the signals which have been raised while blocked). The mask of pending signals is returned in set.

RETURN VALUE
sigpending() returns 0 on success and -1 on error. In the event of an error, errno is set to indicate the cause.

ERRORS

EFAULT
    set points to memory which is not a valid part of the process address space.

CONFORMING TO
POSIX.1-2001.

NOTES
See sigsetops(3) for details on manipulating signal sets. The set of signals that is pending for a thread is the union of the set of signals that is pending for that thread and the set of signals that is pending for the process as a whole; see signal(7). A child created via fork(2) initially has an empty pending signal set; the pending signal set is preserved across an execve(2).

BUGS
In versions of glibc up to and including 2.2.1, there is a bug in the wrapper function for sigpending() which means that information about pending real-time signals is not correctly returned.

SEE ALSO
kill(2), sigaction(2), signal(2), sigprocmask(2), sigsuspend(2), sigsetops(3), signal(7)

COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.