os161-1.99
 All Data Structures
setjmp.h
00001 /*
00002  * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
00003  *      The President and Fellows of Harvard College.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the University nor the names of its contributors
00014  *    may be used to endorse or promote products derived from this software
00015  *    without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
00018  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020  * ARE DISCLAIMED.  IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
00021  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00022  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00023  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00024  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00025  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00026  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00027  * SUCH DAMAGE.
00028  */
00029 
00030 #ifndef _SETJMP_H_
00031 #define _SETJMP_H_
00032 
00033 /* Get the (machine-dependent) definition of jmp_buf. */
00034 #include <machine/setjmp.h>
00035 
00036 /*
00037  * Functions.
00038  *
00039  * setjmp saves the current processor state in the jmp_buf and 
00040  * returns 0. A subsequent call to longjmp with the same jmp_buf
00041  * causes execution to return to where setjmp was called. setjmp
00042  * returns a second time, this time returning CODE. (If CODE is
00043  * 0, it is forced to 1.)
00044  *
00045  * If the stack frame that called setjmp returns before longjmp is
00046  * called, the results are undefined. 
00047  */
00048 
00049 int setjmp(jmp_buf jb);
00050 void longjmp(jmp_buf jb, int code);
00051 
00052 #endif /* _SETJMP_H_ */
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