strsignal(3)

1strsignal(3)               Library Functions Manual               strsignal(3)
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NAME

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

LIBRARY

10       Standard C library (libc, -lc)
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SYNOPSIS

13       #include <string.h>
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15       char *strsignal(int sig);
16       const char *sigdescr_np(int sig);
17       const char *sigabbrev_np(int sig);
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19       [[deprecated]] extern const char *const sys_siglist[];
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21   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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23       sigabbrev_np(), sigdescr_np():
24           _GNU_SOURCE
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26       strsignal():
27           From glibc 2.10 to glibc 2.31:
28               _POSIX_C_SOURCE >= 200809L
29           Before glibc 2.10:
30               _GNU_SOURCE
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32       sys_siglist:
33           Since glibc 2.19:
34               _DEFAULT_SOURCE
35           glibc 2.19 and earlier:
36               _BSD_SOURCE
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DESCRIPTION

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

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

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

80       strsignal()
81              POSIX.1-2008.
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83       sigdescr_np()
84       sigabbrev_np()
85              GNU.
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87       sys_siglist
88              None.
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HISTORY

91       strsignal()
92              POSIX.1-2008.  Solaris, BSD.
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94       sigdescr_np()
95       sigabbrev_np()
96              glibc 2.32.
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98       sys_siglist
99              Removed in glibc 2.32.
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NOTES

102       sigdescr_np() and sigabbrev_np() are thread-safe and async-signal-safe.
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