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66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
/* Copyright (C) 1998-2015 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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#ifndef _SYS_UCONTEXT_H
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#define _SYS_UCONTEXT_H 1
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#include <features.h>
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#include <signal.h>
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#include <bits/sigcontext.h>
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/*
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* These are here mostly for backwards compatibility with older Unices.
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* IA-64 Linux does not distinguish between "struct sigcontext" and
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* "ucontext_t" as all the necessary info is inside the former.
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*/
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typedef struct sigcontext mcontext_t;
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#if __GNUC_PREREQ (3, 5)
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# define _SC_GR0_OFFSET \
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__builtin_offsetof (struct sigcontext, sc_gr[0])
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#elif defined __GNUC__
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# define _SC_GR0_OFFSET \
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(((char *) &((struct sigcontext *) 0)->sc_gr[0]) - (char *) 0)
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#else
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# define _SC_GR0_OFFSET 0xc8 /* pray that this is correct... */
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#endif
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typedef struct ucontext
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{
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union
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{
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mcontext_t _mc;
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struct
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{
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unsigned long _pad[_SC_GR0_OFFSET/8];
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struct ucontext *_link; /* this should overlay sc_gr[0] */
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}
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_uc;
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}
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_u;
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}
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ucontext_t;
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#define uc_mcontext _u._mc
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#define uc_sigmask _u._mc.sc_mask
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#define uc_stack _u._mc.sc_stack
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#define uc_link _u._uc._link
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#endif /* sys/ucontext.h */
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