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.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
.\" and Copyright (C) 2020 Michael Kerrisk <mtk.manpages@gmail.com>
.\"
.\" %%%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.\" manual page may be incorrect or out-of-date.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
.\"
.\" References consulted:
.\" Linux libc source code
.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
.\" 386BSD man pages
.\" Modified Sat Jul 24 17:59:03 1993 by Rik Faith (faith@cs.unc.edu)
.TH STRSIGNAL 3 2020-11-01 "GNU" "Linux Programmer's Manual"
.SH NAME
strsignal, sigdescr_np, sigdescr_np, sys_siglist \- return string describing signal
.SH SYNOPSIS
.nf
.B #include <string.h>
.PP
.BI "char *strsignal(int " sig );
.BI "char *sigdescr_np(int " sig );
.BI "char *sigabbrev_np(int " sig );
.PP
.BI "extern const char * const " sys_siglist [];
.fi
.PP
.RS -4
Feature Test Macro Requirements for glibc (see
.BR feature_test_macros (7)):
.RE
.PP
.BR sigabbrev_np (),
.BR sigdescr_np ():
.PD 0
.ad l
.RS 4
.TP 4
_GNU_SOURCE
.RE
.BR strsignal ():
.ad l
.RS 4
.TP 4
From glibc 2.10 to 2.31:
_POSIX_C_SOURCE\ >=\ 200809L
.TP
Before glibc 2.10:
_GNU_SOURCE
.RE
.br
.IR sys_siglist :
Since glibc 2.19:
_DEFAULT_SOURCE
Glibc 2.19 and earlier:
_BSD_SOURCE
.ad
.PD
.SH DESCRIPTION
The
.BR strsignal ()
function returns a string describing the signal
number passed in the argument
.IR sig .
The string can be used only until the next call to
.BR strsignal ().
The string returned by
.BR strsignal ()
is localized according to the
.B LC_MESSAGES
category in the current locale.
.PP
The
.BR sigdescr_np ()
function returns a string describing the signal
number passed in the argument
.IR sig .
Unlike
.BR strsignal ()
this string is not influenced by the current locale.
.PP
The
.BR sigabbrev_np ()
function returns the abbreviated name of the signal,
.IR sig .
For example, given the value
.BR SIGINT ,
it returns the string "INT".
.PP
The (deprecated) array
.I sys_siglist
holds the signal description strings
indexed by signal number.
The
.BR strsignal ()
or the
.BR sigdescr_np ()
function should be used instead of this array; see also VERSIONS.
.SH RETURN VALUE
The
.BR strsignal ()
function returns the appropriate description
string, or an unknown signal message if the signal number is invalid.
On some systems (but not on Linux), NULL may instead be
returned for an invalid signal number.
.PP
The
.BR sigdescr_np ()
and
.BR sigdabbrev_np ()
functions return the appropriate description string.
The returned string is statically allocated and valid for
the lifetime of the program.
These functions return NULL for an invalid signal number.
.SH VERSIONS
.BR sigdescr_np ()
and
.BR sigdabbrev_np ()
first appeared in glibc 2.32.
.PP
Starting with version 2.32,
.\" glibc commit b1ccfc061feee9ce616444ded8e1cd5acf9fa97f
the
.I sys_siglist
symbol is no longer exported by glibc.
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.TS
allbox;
lb lb lbw31
l l l.
Interface Attribute Value
T{
.BR strsignal ()
T} Thread safety MT-Unsafe race:strsignal locale
T{
.BR sigdescr_np (),
.BR sigabbrev_np ()
T} Thread safety MT-Safe
.TE
.sp 1
.SH CONFORMING TO
.BR strsignal ():
POSIX.1-2008.
Present on Solaris and the BSDs.
.PP
.BR sigdescr_np ()
and
.BR sigdabbrev_np ()
are GNU extensions.
.PP
.I sys_siglist
is nonstandard, but present on many other systems.
.SH NOTES
.BR sigdescr_np ()
and
.BR sigdabbrev_np ()
are thread-safe and async-signal-safe.
.SH SEE ALSO
.BR psignal (3),
.BR strerror (3)
.SH COLOPHON
This page is part of release 5.10 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
\%https://www.kernel.org/doc/man\-pages/.
|
