sig

    The signal to be generated.

 sigcode

    An optional signal code. For example, signal SIGFPE-the
    arithmetic trap signal-has 10 different codes, each representing
    a different type of arithmetic trap.

    The signal codes can be represented by mnemonics or numbers. The
    arithmetic trap codes are represented by the numbers 1 to 10, but
    the SIGILL codes are represented by the numbers 0 to 2. The code
    values are defined in the <signal.h> header file.