614ac5b0f2
See the reference here: https://www.man7.org/linux/man-pages/man2/pipe2.2.html Change-Id: Ife19b9bdbde73c7421be381a094da67017819e63 Signed-off-by: chao.an <anchao@xiaomi.com>
71 lines
2.3 KiB
C
71 lines
2.3 KiB
C
/****************************************************************************
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* libs/libc/unistd/lib_pipe.c
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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 <nuttx/config.h>
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#include <errno.h>
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#include <unistd.h>
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#include <nuttx/drivers/drivers.h>
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#if defined(CONFIG_PIPES) && CONFIG_DEV_PIPE_SIZE > 0
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pipe
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*
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* Description:
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* pipe() creates a pair of file descriptors, pointing to a pipe inode,
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* and places them in the array pointed to by 'fd'. fd[0] is for reading,
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* fd[1] is for writing.
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*
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* Input Parameters:
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* fd[2] - The user provided array in which to catch the pipe file
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* descriptors
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*
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* Returned Value:
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* 0 is returned on success; otherwise, -1 is returned with errno set
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* appropriately.
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*
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****************************************************************************/
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int pipe(int fd[2])
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{
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int ret;
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ret = nx_pipe(fd, CONFIG_DEV_PIPE_SIZE, 0);
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if (ret < 0)
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{
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set_errno(-ret);
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ret = ERROR;
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}
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return ret;
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}
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#endif /* CONFIG_PIPES && CONFIG_DEV_PIPE_SIZE > 0 */
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