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PSIGNAL(3) Library Functions Manual PSIGNAL(3)

psignal, sys_siglist, sys_signame
system signal messages

#include <signal.h>
psignal(unsigned int sig, const char *s);
extern char *sys_siglist[];
extern char *sys_signame[];

The psignal() function locates the descriptive message string for the given signal number sig and writes it to the standard error.
If the argument s is not NULL it is written to the standard error file descriptor prior to the message string, immediately followed by a colon and a space. If the signal number is not recognized (see sigaction(2) for a list), the string “Unknown signal” is produced.
The message strings can be accessed directly using the external array sys_siglist, indexed by recognized signal numbers. The external array sys_signame is used similarly and contains short, upper-case abbreviations for signals which are useful for recognizing signal names in user input. The defined value NSIG contains a count of the strings in sys_siglist and sys_signame.

sigaction(2), perror(3), setlocale(3), strsignal(3)

The psignal() function appeared in 4.2BSD.
June 5, 2013 OpenBSD-current