summaryrefslogtreecommitdiffstats
path: root/man/man3/strsignal.3
blob: 168cde418a5b3b93cb5dfd963decc4e5e4b4a78e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
'\" t
.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
.\" and Copyright (C) 2020 Michael Kerrisk <mtk.manpages@gmail.com>
.\"
.\" SPDX-License-Identifier: Linux-man-pages-copyleft
.\"
.\" 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 2024-05-02 "Linux man-pages (unreleased)"
.SH NAME
strsignal, sigabbrev_np, sigdescr_np, sys_siglist \-
return string describing signal
.SH LIBRARY
Standard C library
.RI ( libc ", " \-lc )
.SH SYNOPSIS
.nf
.B #include <string.h>
.P
.BI "char *strsignal(int " sig );
.BI "const char *sigdescr_np(int " sig );
.BI "const char *sigabbrev_np(int " sig );
.P
.BI "[[deprecated]] extern const char *const " sys_siglist [];
.fi
.P
.RS -4
Feature Test Macro Requirements for glibc (see
.BR feature_test_macros (7)):
.RE
.P
.BR sigabbrev_np (),
.BR sigdescr_np ():
.nf
    _GNU_SOURCE
.fi
.P
.BR strsignal ():
.nf
    From glibc 2.10 to glibc 2.31:
        _POSIX_C_SOURCE >= 200809L
    Before glibc 2.10:
        _GNU_SOURCE
.fi
.P
.IR sys_siglist :
.nf
    Since glibc 2.19:
        _DEFAULT_SOURCE
    glibc 2.19 and earlier:
        _BSD_SOURCE
.fi
.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.
.P
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.
.P
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".
.P
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.
.P
The
.BR sigdescr_np ()
and
.BR sigabbrev_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 ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.TS
allbox;
lb lb lbx
l l l.
Interface	Attribute	Value
T{
.na
.nh
.BR strsignal ()
T}	Thread safety	T{
.na
.nh
MT-Unsafe race:strsignal locale
T}
T{
.na
.nh
.BR sigdescr_np (),
.BR sigabbrev_np ()
T}	Thread safety	MT-Safe
.TE
.SH STANDARDS
.TP
.BR strsignal ()
POSIX.1-2008.
.TP
.BR sigdescr_np ()
.TQ
.BR sigabbrev_np ()
GNU.
.TP
.I sys_siglist
None.
.\" glibc commit b1ccfc061feee9ce616444ded8e1cd5acf9fa97f
.SH HISTORY
.TP
.BR strsignal ()
POSIX.1-2008.
Solaris, BSD.
.TP
.BR sigdescr_np ()
.TQ
.BR sigabbrev_np ()
glibc 2.32.
.TP
.I sys_siglist
Removed in glibc 2.32.
.SH NOTES
.BR sigdescr_np ()
and
.BR sigabbrev_np ()
are thread-safe and async-signal-safe.
.SH SEE ALSO
.BR psignal (3),
.BR strerror (3)