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[];

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).

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)