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FreeBSD 11.0 - man page for psignal (freebsd section 3)

PSIGNAL(3)						   BSD Library Functions Manual 						PSIGNAL(3)

psignal, strsignal, sys_siglist, sys_signame -- system signal messages
Standard C Library (libc, -lc)
#include <signal.h> void psignal(unsigned sig, const char *s); extern const char * const sys_siglist[]; extern const char * const sys_signame[]; #include <string.h> char * strsignal(int sig);
The psignal() and strsignal() functions locate the descriptive message string for a signal number. The strsignal() function accepts a signal number argument sig and returns a pointer to the corresponding message string. The psignal() 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.
February 4, 2011 BSD

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