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setjmp
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setjmp.h
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1993-07-25
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/* Copyright (C) 1991, 1992, 1993 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the, 1992 Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
/*
* ANSI Standard: 4.6 NON-LOCAL JUMPS <setjmp.h>
*/
#ifndef _SETJMP_H
#define _SETJMP_H 1
#include <features.h>
__BEGIN_DECLS
/* Get the machine-dependent definition of `__jmp_buf'. */
#include <jmp_buf.h>
#ifdef __USE_POSIX
#define __need_sigset_t
#include <signal.h>
/* Calling environment, plus possibly a saved signal mask. */
typedef struct
{
__jmp_buf __jmpbuf; /* Calling environment. */
int __mask_was_saved; /* Saved the signal mask? */
sigset_t __saved_mask; /* Saved signal mask. */
} sigjmp_buf[1];
/* Store the calling environment in ENV, also saving the
signal mask if SAVEMASK is nonzero. Return 0. */
extern void __sigjmp_save __P ((sigjmp_buf __env, int __savemask));
#ifdef __GNUC__
#define sigsetjmp(env, savemask) \
({ __typeof ((*((sigjmp_buf *) 0))[0]) *__e = (env); \
__sigjmp_save (__e, (savemask)); \
__setjmp (__e[0].__jmpbuf); })
#else
/* Not strictly POSIX-compliant, because it evaluates ENV more than once. */
#define sigsetjmp(env, savemask) \
(__sigjmp_save ((env), (savemask)), __setjmp ((env)[0].__jmpbuf))
#endif
/* Jump to the environment saved in ENV, making the
sigsetjmp call there return VAL, or 1 if VAL is 0.
Restore the signal mask if that sigsetjmp call saved it. */
extern __NORETURN void siglongjmp __P ((__const sigjmp_buf __env, int __val));
#endif /* Use POSIX. */
#ifdef __FAVOR_BSD
/* BSD defines `setjmp' and `longjmp' to save and restore the set of
blocked signals. For this, `jmp_buf' must be what POSIX calls
`sigjmp_buf', which includes that information. */
typedef sigjmp_buf jmp_buf;
#else /* Don't favor BSD. */
/* A `jmp_buf' really is a `jmp_buf'. Oh boy. */
typedef __jmp_buf jmp_buf;
#endif /* Favor BSD. */
/* Jump to the environment saved in ENV, making the
setjmp call there return VAL, or 1 if VAL is 0. */
extern __NORETURN void __longjmp __P ((__const __jmp_buf __env, int __val));
extern __NORETURN void longjmp __P ((__const jmp_buf __env, int __val));
#ifdef __OPTIMIZE__
#define longjmp(env, val) __longjmp ((env), (val))
#endif /* Optimizing. */
/* Set ENV to the current position and return 0. */
extern int __setjmp __P ((__jmp_buf __env));
/* The ANSI C standard says `setjmp' is a macro. */
#define setjmp(env) __setjmp (env)
#ifdef __USE_BSD
extern __NORETURN void _longjmp __P ((__const jmp_buf __env, int __val));
#endif /* Use BSD. */
#ifdef __FAVOR_BSD
/* We are in the mode in which `setjmp' and `longjmp' save and restore
the signal mask, and `jmp_buf' is `sigjmp_buf'. */
#undef setjmp
#undef longjmp
#define setjmp(env) sigsetjmp ((env), 1)
#ifdef __OPTIMIZE__
#define longjmp(env, val) siglongjmp ((env), (val))
#endif /* Optimizing. */
#define _setjmp(env) sigsetjmp ((env), 0)
#else /* Don't favor BSD. */
/* `setjmp' and `_setjmp' are the same. */
#define _setjmp(env) setjmp (env)
/* `longjmp' and `_longjmp' are the same. */
#define _longjmp(env, val) longjmp ((env), (val))
#endif /* Favor BSD. */
__END_DECLS
#endif /* setjmp.h */