Generates a specified software signal. Generating a signal causes
    the action routine established by the signal, ssignal, or sigvec
    function to be invoked.

    Format

      #include  <signal.h>

      int raise  (int sig); (ANSI C)

      int raise  (int sig[, int sigcode]); (DEC C Extension)

  Additional Information (explode) :

• Arguments
• Description
• Return Values