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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 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

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       pages/.