.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
.\"
+.\" %%%LICENSE_START(VERBATIM)
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.\" manual provided the copyright notice and this permission notice are
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.\" manual under the conditions for verbatim copying, provided that the
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.\" responsibility for errors or omissions, or for damages resulting from
.\" have taken the same level of care in the production of this manual,
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.\" 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 1999-02-08 "GNU" "Linux Programmer's Manual"
+.TH STRSIGNAL 3 2017-09-15 "GNU" "Linux Programmer's Manual"
.SH NAME
strsignal \- return string describing signal
.SH SYNOPSIS
.nf
-.B #define _GNU_SOURCE
-.br
.B #include <string.h>
-.sp
+.PP
.BI "char *strsignal(int " sig );
-.sp
+.PP
.BI "extern const char * const " sys_siglist [];
.fi
+.PP
+.in -4n
+Feature Test Macro Requirements for glibc (see
+.BR feature_test_macros (7)):
+.in
+.PP
+.BR strsignal ():
+.PD 0
+.ad l
+.RS 4
+.TP 4
+Since glibc 2.10:
+_POSIX_C_SOURCE\ >=\ 200809L
+.TP
+Before glibc 2.10:
+_GNU_SOURCE
+.RE
+.ad
+.PD
.SH DESCRIPTION
-The \fBstrsignal()\fP function returns a string describing the signal
-number passed in the argument \fIsig\fP. The string can only be used
-until the next call to \fBstrsignal()\fP.
+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 ().
.PP
-The array \fIsys_siglist\fP holds the signal description strings
-indexed by signal number. The \fBstrsignal()\fP function should be
+The array
+.I sys_siglist
+holds the signal description strings
+indexed by signal number.
+The
+.BR strsignal ()
+function should be
used if possible instead of this array.
-.SH "RETURN VALUE"
-The \fBstrsignal()\fP function returns the appropriate description
+.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), a \fBNULL\fP pointer may be
-returned instead for an invalid signal number.
-.SH "CONFORMING TO"
-This function is not part of any standard, but may be found on Linux
-systems and some UNIX systems (such as Solaris).
-.SH "SEE ALSO"
+On some systems (but not on Linux), NULL may instead be
+returned for an invalid signal number.
+.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
+.TE
+.sp 1
+.SH CONFORMING TO
+POSIX.1-2008.
+Present on Solaris and the BSDs.
+.SH SEE ALSO
.BR psignal (3),
.BR strerror (3)