316f6aea71
Tested with a modified nsh on esp32-devkitc.
```
int main(int argc, FAR char *argv[])
{
+ int fd = open("/dev/null", O_RDWR);
+ _info("hey _info %d\n", fd);
+ write(1, "hey stdout\n", 11);
+ write(2, "hey stderr\n", 11);
```
122 lines
3.6 KiB
C
122 lines
3.6 KiB
C
/****************************************************************************
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* sched/group/group_setupidlefiles.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 <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sched.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/net/net.h>
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#include "group/group.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: group_setupidlefiles
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*
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* Description:
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* Configure the idle thread's TCB.
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*
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* Input Parameters:
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* tcb - tcb of the idle task.
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*
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* Returned Value:
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* 0 is returned on success; a negated errno value is returned on a
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* failure.
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*
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****************************************************************************/
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int group_setupidlefiles(FAR struct task_tcb_s *tcb)
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{
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#if defined(CONFIG_DEV_CONSOLE) || defined(CONFIG_DEV_NULL)
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int fd;
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#endif
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DEBUGASSERT(tcb->cmn.group != NULL);
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/* Open stdin, dup to get stdout and stderr. This should always
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* be the first file opened and, hence, should always get file
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* descriptor 0.
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*/
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#if defined(CONFIG_DEV_CONSOLE) || defined(CONFIG_DEV_NULL)
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#ifdef CONFIG_DEV_CONSOLE
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fd = nx_open("/dev/console", O_RDWR);
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#else
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fd = nx_open("/dev/null", O_RDWR);
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#endif
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if (fd == 0)
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{
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/* Successfully opened stdin (fd == 0) */
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nx_dup2(0, 1);
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nx_dup2(0, 2);
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}
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else
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{
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/* We failed to open stdin OR for some reason, we opened
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* it and got some file descriptor other than 0.
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*/
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if (fd > 0)
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{
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sinfo("Open stdin fd: %d\n", fd);
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nx_close(fd);
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}
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else
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{
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serr("ERROR: Failed to open stdin: %d\n", fd);
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}
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return -ENFILE;
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}
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#else
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/* This configuration can confuse user programs and libraries.
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* Eg. a program which opens a file and then prints something to
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* STDERR_FILENO (2) can end up with something undesirable if the
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* file descriptor for the file happens to be 2.
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* It's a common practice to keep 0-2 always open even if they are
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* /dev/null to avoid that kind of problems. Thus the following warning.
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*/
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#warning file descriptors 0-2 are not opened
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#endif /* defined(CONFIG_DEV_CONSOLE) || defined(CONFIG_DEV_NULL) */
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/* Allocate file/socket streams for the TCB */
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#ifdef CONFIG_FILE_STREAM
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return group_setupstreams(tcb);
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#else
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return OK;
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#endif
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}
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