b50f8e42ba
If longjmp restores the stack frame to an address which is beyond the stack frame at the time of the longjmp call it would install an uninitialized stack frame. If compiled with _FORTIFY_SOURCE defined, longjmp will now bail out in this situation.
123 lines
4 KiB
C
123 lines
4 KiB
C
/* Copyright (C) 1991-1999,2001,2002,2007,2009 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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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/sigset.h> /* Get `__sigset_t'. */
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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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__BEGIN_NAMESPACE_STD
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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) __THROW;
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__END_NAMESPACE_STD
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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) __THROW;
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#ifndef __FAVOR_BSD
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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]) __THROW;
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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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#else
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/* We are in 4.3 BSD-compatibility mode in which `setjmp'
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saves the signal mask like `sigsetjmp (ENV, 1)'. We have to
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define a macro since ISO C says `setjmp' is one. */
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# define setjmp(env) setjmp (env)
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#endif /* Favor BSD. */
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__BEGIN_NAMESPACE_STD
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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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__THROW __attribute__ ((__noreturn__));
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__END_NAMESPACE_STD
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#if defined __USE_BSD || 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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__THROW __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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__THROW __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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