Path: utzoo!yunexus!torsqnt!david
From: david@torsqnt.UUCP (David Haynes)
Newsgroups: comp.lang.c
Subject: Behaviour of setjmp/longjmp and registers
Message-ID: <25@torsqnt.UUCP>
Date: 20 Jan 89 03:30:14 GMT
Article-I.D.: torsqnt.25
Organization: Sequent Computers (Canada) Ltd., Toronto, CANADA
Lines: 24

What should be the result of running the following program?

#include <setjmp.h>

main()
{
	register int j;
	jmp_buf env;

	j = 1;
	if(setjmp(env) == 1) {
		printf("j = %d\n", j);
		exit(1);
	}
	printf("j = %d\n", j);
	j += 3;
	longjmp(env, 1);
}

Sequent, Ultrix and Vax C give results of j = 1, j = 4.
Gcc gives a result of j = 1, j = 1.
What does the ANSI standard say about this?

-david-