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89ebe0ce1f
Due to memfd_create(3)'s construction of a path to pass to shm_open2(2), it has a much larger than typical dependency footprint for a system call wrapper (the list currently includes calloc, memset, sprintf, and strlen). As such, split it off into its own file under libc/gen to lighten libc/sys's dependency list. Reviewed by: kevans, imp, emaste Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D42709 (cherry picked from commit c3207e2d2554c8e36f9cf5950f8cd52a19fedfd5)
73 lines
2.4 KiB
C
73 lines
2.4 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 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(s), this list of conditions and the following disclaimer as
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* the first lines of this file unmodified other than the possible
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* addition of one or more copyright notices.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice(s), this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* 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/filio.h>
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#include <sys/mman.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <unistd.h>
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#include "libc_private.h"
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__weak_reference(shm_open, _shm_open);
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__weak_reference(shm_open, __sys_shm_open);
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int
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shm_open(const char *path, int flags, mode_t mode)
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{
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return (__sys_shm_open2(path, flags | O_CLOEXEC, mode, 0, NULL));
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}
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int
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shm_create_largepage(const char *path, int flags, int psind, int alloc_policy,
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mode_t mode)
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{
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struct shm_largepage_conf slc;
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int error, fd, saved_errno;
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fd = __sys_shm_open2(path, flags | O_CREAT, mode, SHM_LARGEPAGE, NULL);
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if (fd == -1)
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return (-1);
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memset(&slc, 0, sizeof(slc));
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slc.psind = psind;
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slc.alloc_policy = alloc_policy;
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error = ioctl(fd, FIOSSHMLPGCNF, &slc);
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if (error == -1) {
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saved_errno = errno;
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close(fd);
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errno = saved_errno;
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return (-1);
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}
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return (fd);
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}
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