linux man page for sigpending

SIGPENDING(2)						     Linux Programmer's Manual						     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.

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 3.27 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/.

Linux								    2008-10-04							     SIGPENDING(2)