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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
46 lines
1.7 KiB
C
46 lines
1.7 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2020 Kyle Evans <kevans@FreeBSD.org>
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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. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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#include "libc_private.h"
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#define CLOSE_RANGE_OSREL 1300091
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void
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closefrom(int lowfd)
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{
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if (__getosreldate() >= CLOSE_RANGE_OSREL)
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__sys_close_range(MAX(0, lowfd), ~0U, 0);
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else
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/* Fallback to closefrom(2) on older kernels. */
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syscall(SYS_freebsd12_closefrom, lowfd);
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}
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