131 lines
4.3 KiB
C
131 lines
4.3 KiB
C
/****************************************************************************
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* libs/libc/misc/lib_mkfifo.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 <nuttx/config.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <nuttx/fs/fs.h>
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#include "libc.h"
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#if defined(CONFIG_PIPES) && CONFIG_DEV_FIFO_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: mkfifo
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*
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* Description:
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* mkfifo() makes a FIFO device driver file with name 'pathname.' Unlike
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* Linux, a NuttX FIFO is not a special file type but simply a device
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* driver instance. 'mode' specifies the FIFO's permissions.
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*
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* Once the FIFO has been created by mkfifo(), any thread can open it for
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* reading or writing, in the same way as an ordinary file. However, it
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* must have been opened from both reading and writing before input or
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* output can be performed. This FIFO implementation will block all
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* attempts to open a FIFO read-only until at least one thread has opened
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* the FIFO for writing.
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*
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* If all threads that write to the FIFO have closed, subsequent calls to
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* read() on the FIFO will return 0 (end-of-file).
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*
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* Input Parameters:
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* pathname - The full path to the FIFO instance to attach to or to create
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* (if not already created).
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* mode - Ignored for now
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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 mkfifo(FAR const char *pathname, mode_t mode)
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{
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int ret;
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ret = nx_mkfifo(pathname, mode, CONFIG_DEV_FIFO_SIZE);
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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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/****************************************************************************
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* Name: mkfifoat
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*
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* Description:
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* The mkfifoat() system call operates in exactly the same way as mkfifo(),
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* except for the differences described here.
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*
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* If the pathname given in pathname is relative, then it is interpreted
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* relative to the directory referred to by the file descriptor dirfd
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* (rather than relative to the current working directory of the calling
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* process)
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*
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* If pathname is relative and dirfd is the special value AT_FDCWD, then
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* pathname is interpreted relative to the current working directory of
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* the calling process (like mkfifo()).
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*
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* If pathname is absolute, then dirfd is ignored.
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*
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* Input Parameters:
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* dirfd - The file descriptor of directory.
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* path - a pointer to the path.
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* mode - the access mode.
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*
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* Returned Value:
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* Return zero on success, or -1 if an error occurred (in which case,
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* errno is set appropriately).
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*
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****************************************************************************/
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int mkfifoat(int dirfd, FAR const char *path, mode_t mode)
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{
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char fullpath[PATH_MAX];
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int ret;
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ret = lib_getfullpath(dirfd, path, fullpath, sizeof(fullpath));
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if (ret < 0)
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{
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set_errno(-ret);
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return ERROR;
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}
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return mkfifo(fullpath, mode);
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}
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#endif /* CONFIG_PIPES && CONFIG_DEV_FIFO_SIZE > 0 */
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