NAME

       strsignal, sigdescr_np, sigdescr_np, sys_siglist - return string describing signal

SYNOPSIS

       #include <string.h>

       char *strsignal(int sig);
       char *sigdescr_np(int sig);
       char *sigabbrev_np(int sig);

       extern const char * const sys_siglist[];

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       sigabbrev_np(), sigdescr_np():
           _GNU_SOURCE
       strsignal():
           From glibc 2.10 to 2.31:
               _POSIX_C_SOURCE >= 200809L
           Before glibc 2.10:
               _GNU_SOURCE
       sys_siglist:
           Since glibc 2.19:
               _DEFAULT_SOURCE
           Glibc 2.19 and earlier:
               _BSD_SOURCE

DESCRIPTION

       The  strsignal()  function returns a string describing the signal number passed in the argument sig.  The
       string can be used only until the next call to  strsignal().   The  string  returned  by  strsignal()  is
       localized according to the LC_MESSAGES category in the current locale.

       The  sigdescr_np()  function  returns  a  string describing the signal number passed in the argument sig.
       Unlike strsignal() this string is not influenced by the current locale.

       The sigabbrev_np() function returns the abbreviated name of the signal,  sig.   For  example,  given  the
       value SIGINT, it returns the string "INT".

       The  (deprecated)  array  sys_siglist holds the signal description strings indexed by signal number.  The
       strsignal() or the sigdescr_np() function should be used instead of this array; see also VERSIONS.

RETURN VALUE

       The 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.

       The sigdescr_np() and 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.

VERSIONS

       sigdescr_np() and sigdabbrev_np() first appeared in glibc 2.32.

       Starting with version 2.32, the sys_siglist symbol is no longer exported by glibc.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).
       ┌────────────────┬───────────────┬─────────────────────────────────┐
       │ Interface      │ Attribute     │ Value                           │
       ├────────────────┼───────────────┼─────────────────────────────────┤
       │ strsignal()    │ Thread safety │ MT-Unsafe race:strsignal locale │
       ├────────────────┼───────────────┼─────────────────────────────────┤
       │ sigdescr_np(), │ Thread safety │ MT-Safe                         │
       │ sigabbrev_np() │               │                                 │
       └────────────────┴───────────────┴─────────────────────────────────┘

CONFORMING TO

       strsignal(): POSIX.1-2008.  Present on Solaris and the BSDs.

       sigdescr_np() and sigdabbrev_np() are GNU extensions.

       sys_siglist is nonstandard, but present on many other systems.

NOTES

       sigdescr_np() and sigdabbrev_np() are thread-safe and async-signal-safe.

SEE ALSO

       psignal(3), strerror(3)

COLOPHON

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GNU                                                2020-11-01                                       STRSIGNAL(3)