incubator-nuttx/sched/group/group_setupstreams.c

79 lines
2.7 KiB
C

/****************************************************************************
* sched/group/group_setupstreams.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 <sched.h>
#include <fcntl.h>
#include <nuttx/fs/fs.h>
#include <nuttx/net/net.h>
#include <nuttx/lib/lib.h>
#include "group/group.h"
/* Make sure that there are file or socket descriptors in the system and
* that some number of streams have been configured.
*/
#if CONFIG_NFILE_STREAMS > 0
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: group_setupstreams
*
* Description:
* Setup streams data structures that may be used for standard C buffered
* I/O with underlying socket or file descriptors
*
****************************************************************************/
int group_setupstreams(FAR struct task_tcb_s *tcb)
{
DEBUGASSERT(tcb && tcb->cmn.group);
/* Initialize file streams for the task group */
lib_stream_initialize(tcb->cmn.group);
/* fdopen to get the stdin, stdout and stderr streams. The following logic
* depends on the fact that the library layer will allocate FILEs in order.
*
* fd = 0 is stdin (read-only)
* fd = 1 is stdout (write-only, append)
* fd = 2 is stderr (write-only, append)
*/
fs_fdopen(0, O_RDONLY, (FAR struct tcb_s *)tcb, NULL);
fs_fdopen(1, O_WROK | O_CREAT, (FAR struct tcb_s *)tcb, NULL);
fs_fdopen(2, O_WROK | O_CREAT, (FAR struct tcb_s *)tcb, NULL);
return OK;
}
#endif /* CONFIG_NFILE_STREAMS > 0 */