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![Brooks Davis](/assets/img/avatar_default.png)
These provide standard APIs, but are implemented using another system call (e.g., pipe implemented in terms of pipe2) or are interposed by the threading library to support cancelation. After discussion with kib (see D44111), I've concluded that it is better to keep most public interfaces in libc with as little as possible in libsys. Reviewed by: kib Differential Revision: https://reviews.freebsd.org/D44241
50 lines
2 KiB
C
50 lines
2 KiB
C
/*
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* Copyright (c) 2001 Daniel M. Eischen <deischen@freebsd.org>
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* Copyright (c) 2014 The FreeBSD Foundation.
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* All rights reserved.
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*
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* Portions of this software were developed by Konstantin Belousov
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* under sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Neither the name of the author nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/signal.h>
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#include <sys/ucontext.h>
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#include <errno.h>
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#include <stddef.h>
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#include "libc_private.h"
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__weak_reference(__sys_swapcontext, __swapcontext);
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__sym_compat(swapcontext, __impl_swapcontext, FBSD_1.0);
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__weak_reference(swapcontext, __impl_swapcontext);
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__sym_default(swapcontext, swapcontext, FBSD_1.2);
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#pragma weak swapcontext
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int
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swapcontext(ucontext_t *oucp, const ucontext_t *ucp)
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{
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return (((int (*)(ucontext_t *, const ucontext_t *))
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*(__libc_interposing_slot(INTERPOS_swapcontext)))(oucp, ucp));
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}
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