80 lines
2.5 KiB
C
80 lines
2.5 KiB
C
/****************************************************************************
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* libs/libc/misc/lib_memfd.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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#if defined(CONFIG_LIBC_MEMFD_TMPFS) || defined(CONFIG_LIBC_MEMFD_SHMFS)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifdef CONFIG_LIBC_MEMFD_TMPFS
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# define LIBC_MEM_FD_VFS_PATH CONFIG_LIBC_TMPDIR "/" CONFIG_LIBC_MEM_FD_VFS_PATH
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#else
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# define LIBC_MEM_FD_VFS_PATH CONFIG_LIBC_MEM_FD_VFS_PATH
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#endif
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#define LIBC_MEM_FD_VFS_PATH_FMT LIBC_MEM_FD_VFS_PATH "/%s"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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int memfd_create(FAR const char *name, unsigned int flags)
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{
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#ifdef CONFIG_LIBC_MEMFD_ERROR
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set_errno(ENOSYS);
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return -1;
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#else
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char path[PATH_MAX];
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int ret;
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snprintf(path, sizeof(path), LIBC_MEM_FD_VFS_PATH_FMT, name);
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# ifdef CONFIG_LIBC_MEMFD_SHMFS
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ret = shm_open(path, O_RDWR | flags, 0660);
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if (ret >= 0)
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{
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shm_unlink(path);
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}
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# else
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mkdir(LIBC_MEM_FD_VFS_PATH, 0666);
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ret = open(path, O_RDWR | flags, 0660);
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if (ret >= 0)
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{
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unlink(path);
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}
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# endif
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return ret;
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#endif
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}
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#endif
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