#include <signal.h>
void psignal(int sig , const char * s );
extern const char *const sys_siglist []
DESCRIPTION
The psignal() function displays a message on stderr
consisting of the string s, a colon, a space, and a string
describing the signal number sig. If sig is invalid,
the message displayed will indicate an unknown signal.
The array sys_siglist holds the signal description strings
indexed by signal number.
