print names of signal numbers.

signames.c

#include <signal.h>
#include <stdio.h>
#include <string.h>

int
main (int   argc,
      char *argv[])
{
   const char *str;
   int i;

   for (i = 0; i < NSIG; i++) {
      str = strsignal (i);
      printf ("%02d: %s\n", i, str);
   }

   return 0;
}