Provides a way to transfer control from a nested series of
    function invocations back to a predefined point without returning
    normally; that is, by not using a series of return statements.
    The longjmp function restores the context of the environment
    buffer.

    Format

      #include  <setjmp.h>

      void longjmp  (jmp_buf env, int value);

  Additional Information (explode) :

• Arguments
• Description
• Restrictions