| Current File : //usr/include/setjmp.h |
/* Copyright (C) 1991-2018 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
/*
* ISO C99 Standard: 7.13 Nonlocal jumps <setjmp.h>
*/
#ifndef _SETJMP_H
#define _SETJMP_H 1
#include <features.h>
__BEGIN_DECLS
#include <bits/setjmp.h> /* Get `__jmp_buf'. */
#include <bits/types/__sigset_t.h>
/* Calling environment, plus possibly a saved signal mask. */
struct __jmp_buf_tag
{
/* NOTE: The machine-dependent definitions of `__sigsetjmp'
assume that a `jmp_buf' begins with a `__jmp_buf' and that
`__mask_was_saved' follows it. Do not move these members
or add others before it. */
__jmp_buf __jmpbuf; /* Calling environment. */
int __mask_was_saved; /* Saved the signal mask? */
__sigset_t __saved_mask; /* Saved signal mask. */
};
typedef struct __jmp_buf_tag jmp_buf[1];
/* Store the calling environment in ENV, also saving the signal mask.
Return 0. */
extern int setjmp (jmp_buf __env) __THROWNL;
/* Store the calling environment in ENV, also saving the
signal mask if SAVEMASK is nonzero. Return 0.
This is the internal name for `sigsetjmp'. */
extern int __sigsetjmp (struct __jmp_buf_tag __env[1], int __savemask) __THROWNL;
/* Store the calling environment in ENV, not saving the signal mask.
Return 0. */
extern int _setjmp (struct __jmp_buf_tag __env[1]) __THROWNL;
/* Do not save the signal mask. This is equivalent to the `_setjmp'
BSD function. */
#define setjmp(env) _setjmp (env)
/* Jump to the environment saved in ENV, making the
`setjmp' call there return VAL, or 1 if VAL is 0. */
extern void longjmp (struct __jmp_buf_tag __env[1], int __val)
__THROWNL __attribute__ ((__noreturn__));
#if defined __USE_MISC || defined __USE_XOPEN
/* Same. Usually `_longjmp' is used with `_setjmp', which does not save
the signal mask. But it is how ENV was saved that determines whether
`longjmp' restores the mask; `_longjmp' is just an alias. */
extern void _longjmp (struct __jmp_buf_tag __env[1], int __val)
__THROWNL __attribute__ ((__noreturn__));
#endif
#ifdef __USE_POSIX
/* Use the same type for `jmp_buf' and `sigjmp_buf'.
The `__mask_was_saved' flag determines whether
or not `longjmp' will restore the signal mask. */
typedef struct __jmp_buf_tag sigjmp_buf[1];
/* Store the calling environment in ENV, also saving the
signal mask if SAVEMASK is nonzero. Return 0. */
# define sigsetjmp(env, savemask) __sigsetjmp (env, savemask)
/* 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.
This is just an alias `longjmp'. */
extern void siglongjmp (sigjmp_buf __env, int __val)
__THROWNL __attribute__ ((__noreturn__));
#endif /* Use POSIX. */
/* Define helper functions to catch unsafe code. */
#if __USE_FORTIFY_LEVEL > 0
# include <bits/setjmp2.h>
#endif
__END_DECLS
#endif /* setjmp.h */