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PSIGNAL(3) Library Functions Manual PSIGNAL(3)

psignal, strsignal, sys_siglist, sys_signame — system signal messages

library “libc”

#include <signal.h>

void
psignal(int sig, const char *s);

extern const char * const sys_siglist[];
extern const char * const sys_signame[];

#include <string.h>

char *
strsignal(int sig);

The () and strsignal() functions locate the descriptive message string for a signal number.

The () function accepts a signal number argument sig and returns a pointer to the corresponding message string.

The () function accepts a signal number argument sig and writes it to the standard error. If the argument s is non-NULL and does not point to the null character, s 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 (sigaction(2)), the string “Unknown signal” is produced.

The message strings can be accessed directly through 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 variable NSIG contains a count of the strings in sys_siglist and sys_signame.

sigaction(2), perror(3), strerror(3)

The psignal() function appeared in 4.2BSD.

May 30, 2016 FreeBSD-12.0