mirror of https://github.com/mkerrisk/man-pages
90 lines
2.8 KiB
Groff
90 lines
2.8 KiB
Groff
.\" Copyright (c) 2005 Michael Kerrisk
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.\" based on earlier work by faith@cs.unc.edu and
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.\" Mike Battersby <mib@deakin.edu.au>
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.\" 2005-09-15, mtk, Created new page by splitting off from sigaction.2
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.\"
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.TH SIGPENDING 2 2008-10-04 "Linux" "Linux Programmer's Manual"
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.SH NAME
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sigpending \- examine pending signals
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.SH SYNOPSIS
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.B #include <signal.h>
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.sp
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.BI "int sigpending(sigset_t *" set );
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.sp
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.in -4n
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Feature Test Macro Requirements for glibc (see
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.BR feature_test_macros (7)):
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.in
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.sp
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.ad l
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.BR sigpending ():
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_POSIX_C_SOURCE\ >=\ 1 || _XOPEN_SOURCE || _POSIX_SOURCE
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.ad b
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.SH DESCRIPTION
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.PP
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.BR sigpending ()
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returns the set of signals that are pending for delivery to the calling
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thread (i.e., the signals which have been raised while blocked).
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The mask of pending signals is returned in
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.IR set .
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.SH "RETURN VALUE"
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.BR sigpending ()
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returns 0 on success and \-1 on error.
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.SH ERRORS
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.TP
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.B EFAULT
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.I set
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points to memory which is not a valid part of the process address space.
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.SH "CONFORMING TO"
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POSIX.1-2001.
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.SH NOTES
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See
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.BR sigsetops (3)
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for details on manipulating signal sets.
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The set of signals that is pending for a thread
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is the union of the set of signals that is pending for that thread
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and the set of signals that is pending for the process as a whole; see
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.BR signal (7).
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A child created via
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.BR fork (2)
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initially has an empty pending signal set;
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the pending signal set is preserved across an
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.BR execve (2).
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.SH BUGS
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In versions of glibc up to and including 2.2.1,
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there is a bug in the wrapper function for
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.BR sigpending ()
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which means that information about pending real-time signals
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is not correctly returned.
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.SH "SEE ALSO"
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.BR kill (2),
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.BR sigaction (2),
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.BR signal (2),
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.BR sigprocmask (2),
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.BR sigsuspend (2),
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.BR sigsetops (3),
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.BR signal (7)
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