usr/src/lib/libcompat/4.1/reset.c

/*      reset.c 4.2     90/06/23        */

/*
 * This can't be written in C.  You have to longjmp from a context
 * below (stackwise) the call to setjmp:
 *
 *      /* test reset/setexit *(/
 *      main()
 *      {
 *              int i = setexit();
 *              printf("i=%d\n", i);
 *              if (i == 0)
 *                      reset(1);
 *      }
 *
 * The above prints `longjmp botch' and dumps core.
 */

/*
 * Backwards compatible setexit/reset.
 */
#include <setjmp.h>

static  jmp_buf save;

setexit()
{

        return (setjmp(save));
}

reset(x)
{

        longjmp(save, x);
}