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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 19:40:15 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 19:40:15 +0000 |
commit | 399644e47874bff147afb19c89228901ac39340e (patch) | |
tree | 1c4c0b733f4c16b5783b41bebb19194a9ef62ad1 /man2/sigpending.2 | |
parent | Initial commit. (diff) | |
download | manpages-399644e47874bff147afb19c89228901ac39340e.tar.xz manpages-399644e47874bff147afb19c89228901ac39340e.zip |
Adding upstream version 6.05.01.upstream/6.05.01
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'man2/sigpending.2')
-rw-r--r-- | man2/sigpending.2 | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/man2/sigpending.2 b/man2/sigpending.2 new file mode 100644 index 0000000..e1b3158 --- /dev/null +++ b/man2/sigpending.2 @@ -0,0 +1,110 @@ +.\" Copyright (c) 2005 Michael Kerrisk +.\" based on earlier work by faith@cs.unc.edu and +.\" Mike Battersby <mib@deakin.edu.au> +.\" +.\" SPDX-License-Identifier: Linux-man-pages-copyleft +.\" +.\" 2005-09-15, mtk, Created new page by splitting off from sigaction.2 +.\" +.TH sigpending 2 2023-03-30 "Linux man-pages 6.05.01" +.SH NAME +sigpending, rt_sigpending \- examine pending signals +.SH LIBRARY +Standard C library +.RI ( libc ", " \-lc ) +.SH SYNOPSIS +.nf +.B #include <signal.h> +.PP +.BI "int sigpending(sigset_t *" set ); +.fi +.PP +.RS -4 +Feature Test Macro Requirements for glibc (see +.BR feature_test_macros (7)): +.RE +.PP +.BR sigpending (): +.nf + _POSIX_C_SOURCE +.fi +.SH DESCRIPTION +.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. +On failure, \-1 is returned and +.I errno +is set to indicate the error. +.SH ERRORS +.TP +.B EFAULT +.I set +points to memory which is not a valid part of the process address space. +.SH STANDARDS +POSIX.1-2008. +.SH HISTORY +POSIX.1-2001. +.SS C library/kernel differences +The original Linux system call was named +.BR sigpending (). +However, with the addition of real-time signals in Linux 2.2, +the fixed-size, 32-bit +.I sigset_t +argument supported by that system call was no longer fit for purpose. +Consequently, a new system call, +.BR rt_sigpending (), +was added to support an enlarged +.I sigset_t +type. +The new system call takes a second argument, +.IR "size_t sigsetsize" , +which specifies the size in bytes of the signal set in +.IR set . +.\" This argument is currently required to be less than or equal to +.\" .IR sizeof(sigset_t) +.\" (or the error +.\" .B EINVAL +.\" results). +The glibc +.BR sigpending () +wrapper function hides these details from us, transparently calling +.BR rt_sigpending () +when the kernel provides it. +.SH NOTES +See +.BR sigsetops (3) +for details on manipulating signal sets. +.PP +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. +.PP +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). +.PP +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 +Up to and including glibc 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) |