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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 threads that
       is peding 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

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