strsignal - return string describing signal
sys_siglist holds the signal description strings indexed by signal number. The strsignal() function should be used if possible instead of this array.
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.
POSIX.1-2008. Present on Solaris and the BSDs.
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