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 sig‐
       nals 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.

       If a signal is both blocked and has a disposition of "ignored", it is  not  added  to  the
       mask of pending signals when generated.

       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 3.74 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 http://www.kernel.org/doc/man-pages/.



Linux                                       2013-12-11                              SIGPENDING(2)