1STRSIGNAL(3)               Linux Programmer's Manual              STRSIGNAL(3)
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NAME

6       strsignal,  sigdescr_np,  sigdescr_np,  sys_siglist - return string de‐
7       scribing signal
8

SYNOPSIS

10       #include <string.h>
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12       char *strsignal(int sig);
13       const char *sigdescr_np(int sig);
14       const char *sigabbrev_np(int sig);
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16       extern const char *const sys_siglist[];
17
18   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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20       sigabbrev_np(), sigdescr_np():
21           _GNU_SOURCE
22
23       strsignal():
24           From glibc 2.10 to 2.31:
25               _POSIX_C_SOURCE >= 200809L
26           Before glibc 2.10:
27               _GNU_SOURCE
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29       sys_siglist:
30           Since glibc 2.19:
31               _DEFAULT_SOURCE
32           Glibc 2.19 and earlier:
33               _BSD_SOURCE
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DESCRIPTION

36       The strsignal() function returns a string describing the signal  number
37       passed in the argument sig.  The string can be used only until the next
38       call to strsignal().  The string returned by strsignal()  is  localized
39       according to the LC_MESSAGES category in the current locale.
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41       The  sigdescr_np() function returns a string describing the signal num‐
42       ber passed in the argument sig.  Unlike strsignal() this string is  not
43       influenced by the current locale.
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45       The sigabbrev_np() function returns the abbreviated name of the signal,
46       sig.  For example, given the value SIGINT, it returns the string "INT".
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48       The (deprecated) array sys_siglist holds the signal description strings
49       indexed  by  signal number.  The strsignal() or the sigdescr_np() func‐
50       tion should be used instead of this array; see also VERSIONS.
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RETURN VALUE

53       The strsignal() function returns the appropriate description string, or
54       an  unknown  signal  message  if the signal number is invalid.  On some
55       systems (but not on Linux), NULL may instead be returned for an invalid
56       signal number.
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58       The  sigdescr_np() and sigdabbrev_np() functions return the appropriate
59       description string.  The returned string is  statically  allocated  and
60       valid for the lifetime of the program.  These functions return NULL for
61       an invalid signal number.
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VERSIONS

64       sigdescr_np() and sigdabbrev_np() first appeared in glibc 2.32.
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66       Starting with version 2.32, the sys_siglist symbol  is  no  longer  ex‐
67       ported by glibc.
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ATTRIBUTES

70       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
71       tributes(7).
72
73       ┌───────────────┬───────────────┬──────────────────────────────────────┐
74       │Interface      │ Attribute     │ Value                                │
75       ├───────────────┼───────────────┼──────────────────────────────────────┤
76       │strsignal()    │ Thread safety │ MT-Unsafe race:strsignal locale      │
77       ├───────────────┼───────────────┼──────────────────────────────────────┤
78       │sigdescr_np(), │ Thread safety │ MT-Safe                              │
79       │sigabbrev_np() │               │                                      │
80       └───────────────┴───────────────┴──────────────────────────────────────┘
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CONFORMING TO

83       strsignal(): POSIX.1-2008.  Present on Solaris and the BSDs.
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85       sigdescr_np() and sigdabbrev_np() are GNU extensions.
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87       sys_siglist is nonstandard, but present on many other systems.
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NOTES

90       sigdescr_np()  and  sigdabbrev_np()  are  thread-safe and async-signal-
91       safe.
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SEE ALSO

94       psignal(3), strerror(3)
95

COLOPHON

97       This page is part of release 5.12 of the Linux  man-pages  project.   A
98       description  of  the project, information about reporting bugs, and the
99       latest    version    of    this    page,    can     be     found     at
100       https://www.kernel.org/doc/man-pages/.
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104GNU                               2021-03-22                      STRSIGNAL(3)