/* Copyright (C) 1991-2018 Free Software Foundation, Inc.

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This file is part of the GNU C Library.

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The GNU C Library is free software; you can redistribute it and/or

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modify it under the terms of the GNU Lesser General Public

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License as published by the Free Software Foundation; either

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version 2.1 of the License, or (at your option) any later version.

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The GNU C Library is distributed in the hope that it will be useful,

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but WITHOUT ANY WARRANTY; without even the implied warranty of

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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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Lesser General Public License for more details.

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You should have received a copy of the GNU Lesser General Public

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License along with the GNU C Library; if not, see

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<http://www.gnu.org/licenses/>. */

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/*

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* ISO C99 Standard: 7.13 Nonlocal jumps <setjmp.h>

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*/

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#ifndef _SETJMP_H

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#define _SETJMP_H 1

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#include <features.h>

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__BEGIN_DECLS

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#include <bits/setjmp.h> /* Get `__jmp_buf'. */

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#include <bits/types/__sigset_t.h>

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/* Calling environment, plus possibly a saved signal mask. */

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struct __jmp_buf_tag

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{

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/* NOTE: The machine-dependent definitions of `__sigsetjmp'

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assume that a `jmp_buf' begins with a `__jmp_buf' and that

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`__mask_was_saved' follows it. Do not move these members

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or add others before it. */

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__jmp_buf __jmpbuf; /* Calling environment. */

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int __mask_was_saved; /* Saved the signal mask? */

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__sigset_t __saved_mask; /* Saved signal mask. */

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};

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typedef struct __jmp_buf_tag jmp_buf[1];

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/* Store the calling environment in ENV, also saving the signal mask.

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Return 0. */

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extern int setjmp (jmp_buf __env) __THROWNL;

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/* Store the calling environment in ENV, also saving the

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signal mask if SAVEMASK is nonzero. Return 0.

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This is the internal name for `sigsetjmp'. */

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extern int __sigsetjmp (struct __jmp_buf_tag __env[1], int __savemask) __THROWNL;

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/* Store the calling environment in ENV, not saving the signal mask.

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Return 0. */

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extern int _setjmp (struct __jmp_buf_tag __env[1]) __THROWNL;

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/* Do not save the signal mask. This is equivalent to the `_setjmp'

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BSD function. */

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#define setjmp(env) _setjmp (env)

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/* Jump to the environment saved in ENV, making the

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`setjmp' call there return VAL, or 1 if VAL is 0. */

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extern void longjmp (struct __jmp_buf_tag __env[1], int __val)

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__THROWNL __attribute__ ((__noreturn__));

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#if defined __USE_MISC || defined __USE_XOPEN

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/* Same. Usually `_longjmp' is used with `_setjmp', which does not save

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the signal mask. But it is how ENV was saved that determines whether

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`longjmp' restores the mask; `_longjmp' is just an alias. */

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extern void _longjmp (struct __jmp_buf_tag __env[1], int __val)

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__THROWNL __attribute__ ((__noreturn__));

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#endif

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#ifdef __USE_POSIX

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/* Use the same type for `jmp_buf' and `sigjmp_buf'.

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The `__mask_was_saved' flag determines whether

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or not `longjmp' will restore the signal mask. */

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typedef struct __jmp_buf_tag sigjmp_buf[1];

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/* Store the calling environment in ENV, also saving the

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signal mask if SAVEMASK is nonzero. Return 0. */

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# define sigsetjmp(env, savemask) __sigsetjmp (env, savemask)

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/* Jump to the environment saved in ENV, making the

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sigsetjmp call there return VAL, or 1 if VAL is 0.

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Restore the signal mask if that sigsetjmp call saved it.

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This is just an alias `longjmp'. */

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extern void siglongjmp (sigjmp_buf __env, int __val)

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__THROWNL __attribute__ ((__noreturn__));

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#endif /* Use POSIX. */

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/* Define helper functions to catch unsafe code. */

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#if __USE_FORTIFY_LEVEL > 0

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# include <bits/setjmp2.h>

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#endif

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__END_DECLS

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#endif /* setjmp.h */

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