61 lines
1.5 KiB
C
61 lines
1.5 KiB
C
/* -*-comment-start: "//";comment-end:""-*-
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2017,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of GNU Mes.
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*
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* GNU Mes is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* GNU Mes is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <mes/lib.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <setjmp.h>
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int foo;
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jmp_buf buf;
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void
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second ()
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{
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if (foo++)
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exit (1);
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oputs ("second\n"); // prints
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longjmp (buf, 1); // jumps back to where setjmp was called - making setjmp now return 1
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exit (1);
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}
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void
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first ()
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{
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second ();
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oputs ("first\n"); // does not print
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exit (2);
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}
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int
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main ()
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{
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if (!setjmp (buf))
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first (); // when executed, setjmp returned 0
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else // when longjmp jumps back, setjmp returns 1
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{
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oputs ("main\n"); // prints
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return 0;
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}
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return 3;
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}
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