.\" Copyright (c) 2005 Michael Kerrisk .\" based on earlier work by faith@cs.unc.edu and .\" Mike Battersby .\" .\" %%%LICENSE_START(VERBATIM) .\" Permission is granted to make and distribute verbatim copies of this .\" manual provided the copyright notice and this permission notice are .\" preserved on all copies. .\" .\" Permission is granted to copy and distribute modified versions of this .\" manual under the conditions for verbatim copying, provided that the .\" entire resulting derived work is distributed under the terms of a .\" permission notice identical to this one. .\" .\" Since the Linux kernel and libraries are constantly changing, this .\" manual page may be incorrect or out-of-date. The author(s) assume no .\" responsibility for errors or omissions, or for damages resulting from .\" the use of the information contained herein. The author(s) may not .\" have taken the same level of care in the production of this manual, .\" which is licensed free of charge, as they might when working .\" professionally. .\" .\" Formatted or processed versions of this manual, if unaccompanied by .\" the source, must acknowledge the copyright and authors of this work. .\" %%%LICENSE_END .\" .\" 2005-09-15, mtk, Created new page by splitting off from sigaction.2 .\" .TH SIGPENDING 2 2013-12-11 "Linux" "Linux Programmer's Manual" .SH NAME sigpending \- examine pending signals .SH SYNOPSIS .B #include .sp .BI "int sigpending(sigset_t *" set ); .sp .in -4n Feature Test Macro Requirements for glibc (see .BR feature_test_macros (7)): .in .sp .ad l .BR sigpending (): _POSIX_C_SOURCE\ >=\ 1 || _XOPEN_SOURCE || _POSIX_SOURCE .ad b .SH DESCRIPTION .PP .BR 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 .IR set . .SH RETURN VALUE .BR sigpending () returns 0 on success and \-1 on error. In the event of an error, .I errno is set to indicate the cause. .SH ERRORS .TP .B EFAULT .I set points to memory which is not a valid part of the process address space. .SH CONFORMING TO POSIX.1-2001. .SH NOTES See .BR sigsetops (3) for details on manipulating signal sets. If a signal is both blocked and has a disposition of "ignored", it is .I 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 .BR signal (7). A child created via .BR fork (2) initially has an empty pending signal set; the pending signal set is preserved across an .BR execve (2). .SH BUGS In versions of glibc up to and including 2.2.1, there is a bug in the wrapper function for .BR sigpending () which means that information about pending real-time signals is not correctly returned. .SH SEE ALSO .BR kill (2), .BR sigaction (2), .BR signal (2), .BR sigprocmask (2), .BR sigsuspend (2), .BR sigsetops (3), .BR signal (7) .SH COLOPHON This page is part of release 3.74 of the Linux .I 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/.