NAME

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

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

       #include <string.h>

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

       [[deprecated]] 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 glibc 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 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.

VERSIONS

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

       Starting with glibc 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() │               │                                                         │
       └───────────────┴───────────────┴─────────────────────────────────────────────────────────┘

STANDARDS

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

       sigdescr_np() and sigabbrev_np() are GNU extensions.

       sys_siglist is nonstandard, but present on many other systems.

NOTES

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

SEE ALSO

       psignal(3), strerror(3)