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longjmp
=======

Syntax
------

     #include <setjmp.h>
     
     void longjmp(jmp_buf env, int val);

Description
-----------

This function reverts back to a CPU state that was stored in ENV by
`setjmp' (setjmp:.).  The state includes all CPU registers, so   
any variable in a register when `setjmp' was called will be preserved,
and all else will be indeterminate.

The value passed as VAL will be the return value of `setjmp' when it
resumes processing there.  If VAL is zero, the return value will be one.

Return Value
------------

This function does not return.

Example
-------

     jmp_buf j;
     if (setjmp(j))
       return;
     do_something();
     longjmp(j);