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SIGPENDING(2) Linux Programmer's Manual SIGPENDING(2)
sigpending, rt_sigpending - examine pending signals
#include <signal.h>
int sigpending(sigset_t *set);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
sigpending(): _POSIX_C_SOURCE
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.
sigpending() returns 0 on success and -1 on error. In the event
of an error, errno is set to indicate the cause.
EFAULT set points to memory which is not a valid part of the
process address space.
POSIX.1-2001, POSIX.1-2008.
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).
C library/kernel differences
The original Linux system call was named sigpending(). However,
with the addition of real-time signals in Linux 2.2, the fixed-
size, 32-bit sigset_t argument supported by that system call was
no longer fit for purpose. Consequently, a new system call,
rt_sigpending(), was added to support an enlarged sigset_t type.
The new system call takes a second argument, size_t sigsetsize,
which specifies the size in bytes of the signal set in set. The
glibc sigpending() wrapper function hides these details from us,
transparently calling rt_sigpending() when the kernel provides
it.
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.
kill(2), sigaction(2), signal(2), sigprocmask(2), sigsuspend(2),
sigsetops(3), signal(7)
This page is part of release 5.10 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
https://www.kernel.org/doc/man-pages/.
Linux 2017-09-15 SIGPENDING(2)
Pages that refer to this page: clone(2), fork(2), sigaction(2), signal(2), sigprocmask(2), sigwaitinfo(2), syscalls(2), pthread_create(3), pthread_kill(3), pthread_sigmask(3), sigsetops(3), sigwait(3), signal(7), signal-safety(7), system_data_types(7)
Copyright and license for this manual page
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