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/* Copyright (C) 1998-2016 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/>. */
#ifndef _SYS_UCONTEXT_H
#define _SYS_UCONTEXT_H 1
#include <features.h>
#include <signal.h>
#include <bits/sigcontext.h>
/*
* These are here mostly for backwards compatibility with older Unices.
* IA-64 Linux does not distinguish between "struct sigcontext" and
* "ucontext_t" as all the necessary info is inside the former.
*/
typedef struct sigcontext mcontext_t;
#if __GNUC_PREREQ (3, 5)
# define _SC_GR0_OFFSET \
__builtin_offsetof (struct sigcontext, sc_gr[0])
#elif defined __GNUC__
# define _SC_GR0_OFFSET \
(((char *) &((struct sigcontext *) 0)->sc_gr[0]) - (char *) 0)
#else
# define _SC_GR0_OFFSET 0xc8 /* pray that this is correct... */
#endif
typedef struct ucontext
{
union
{
mcontext_t _mc;
struct
{
unsigned long _pad[_SC_GR0_OFFSET/8];
struct ucontext *_link; /* this should overlay sc_gr[0] */
}
_uc;
}
_u;
}
ucontext_t;
#define uc_mcontext _u._mc
#define uc_sigmask _u._mc.sc_mask
#define uc_stack _u._mc.sc_stack
#define uc_link _u._uc._link
#endif /* sys/ucontext.h */
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