14f8a6c2dd
Refs to: https://linux.die.net/man/2/openat Signed-off-by: dongjiuzhu1 <dongjiuzhu1@xiaomi.com>
129 lines
4.2 KiB
C
129 lines
4.2 KiB
C
/****************************************************************************
|
|
* libs/libc/misc/lib_mkfifo.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <errno.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include <nuttx/fs/fs.h>
|
|
|
|
#include "libc.h"
|
|
|
|
#if defined(CONFIG_PIPES) && CONFIG_DEV_FIFO_SIZE > 0
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: mkfifo
|
|
*
|
|
* Description:
|
|
* mkfifo() makes a FIFO device driver file with name 'pathname.' Unlike
|
|
* Linux, a NuttX FIFO is not a special file type but simply a device
|
|
* driver instance. 'mode' specifies the FIFO's permissions.
|
|
*
|
|
* Once the FIFO has been created by mkfifo(), any thread can open it for
|
|
* reading or writing, in the same way as an ordinary file. However, it
|
|
* must have been opened from both reading and writing before input or
|
|
* output can be performed. This FIFO implementation will block all
|
|
* attempts to open a FIFO read-only until at least one thread has opened
|
|
* the FIFO for writing.
|
|
*
|
|
* If all threads that write to the FIFO have closed, subsequent calls to
|
|
* read() on the FIFO will return 0 (end-of-file).
|
|
*
|
|
* Input Parameters:
|
|
* pathname - The full path to the FIFO instance to attach to or to create
|
|
* (if not already created).
|
|
* mode - Ignored for now
|
|
*
|
|
* Returned Value:
|
|
* 0 is returned on success; otherwise, -1 is returned with errno set
|
|
* appropriately.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int mkfifo(FAR const char *pathname, mode_t mode)
|
|
{
|
|
int ret;
|
|
|
|
ret = nx_mkfifo(pathname, mode, CONFIG_DEV_FIFO_SIZE);
|
|
if (ret < 0)
|
|
{
|
|
set_errno(-ret);
|
|
ret = ERROR;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: mkfifoat
|
|
*
|
|
* Description:
|
|
* The mkfifoat() system call operates in exactly the same way as mkfifo(),
|
|
* except for the differences described here.
|
|
*
|
|
* If the pathname given in pathname is relative, then it is interpreted
|
|
* relative to the directory referred to by the file descriptor dirfd
|
|
* (rather than relative to the current working directory of the calling
|
|
* process)
|
|
*
|
|
* If pathname is relative and dirfd is the special value AT_FDCWD, then
|
|
* pathname is interpreted relative to the current working directory of
|
|
* the calling process (like mkfifo()).
|
|
*
|
|
* If pathname is absolute, then dirfd is ignored.
|
|
*
|
|
* Input Parameters:
|
|
* dirfd - The file descriptor of directory.
|
|
* path - a pointer to the path.
|
|
* mode - the access mode.
|
|
*
|
|
* Returned Value:
|
|
* Return zero on success, or -1 if an error occurred (in which case,
|
|
* errno is set appropriately).
|
|
*
|
|
****************************************************************************/
|
|
|
|
int mkfifoat(int dirfd, FAR const char *path, mode_t mode)
|
|
{
|
|
char fullpath[PATH_MAX];
|
|
int ret;
|
|
|
|
ret = lib_getfullpath(dirfd, path, fullpath);
|
|
if (ret < 0)
|
|
{
|
|
set_errno(-ret);
|
|
return ERROR;
|
|
}
|
|
|
|
return mkfifo(fullpath, mode);
|
|
}
|
|
|
|
#endif /* CONFIG_PIPES && CONFIG_DEV_FIFO_SIZE > 0 */
|