strsignal(3) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | VERSIONS | ATTRIBUTES | CONFORMING TO | NOTES | SEE ALSO | COLOPHON

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

NAME         top

       strsignal,  sigdescr_np, sigdescr_np, sys_siglist - return string de‐
       scribing signal

SYNOPSIS         top

       #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         top

       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         top

       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         top

       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         top

       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         top

       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         top

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

SEE ALSO         top

       psignal(3), strerror(3)

COLOPHON         top

       This page is part of release 5.09 of the Linux man-pages project.  A
       description of the project, information about reporting bugs, and the
       latest version of this page, can be found at
       https://www.kernel.org/doc/man-pages/.

GNU                              2020-11-01                     STRSIGNAL(3)

Pages that refer to this page: psiginfo(3)psignal(3)strerror(3)strerrordesc_np(3)strerror_l(3)strerrorname_np(3)strerror_r(3)signal(7)