503 lines
14 KiB
C
503 lines
14 KiB
C
/****************************************************************************
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* fs/procfs/fs_skeleton.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 <sys/types.h>
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#include <sys/stat.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.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/arch.h>
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#include <nuttx/sched.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/fs/procfs.h>
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#include <arch/irq.h>
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#if !defined(CONFIG_DISABLE_MOUNTPOINT) && defined(CONFIG_FS_PROCFS)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/* This enumeration identifies all of the thread attributes that can be
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* accessed via the procfs file system.
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*/
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/* This structure describes one open "file" */
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struct skel_file_s
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{
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struct procfs_file_s base; /* Base open file structure */
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/* Add context specific data types for managing an open file here */
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};
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/* Level 1 is the directory of attributes */
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struct skel_level1_s
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{
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struct procfs_dir_priv_s base; /* Base directory private data */
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/* Add context specific data types here for managing the directory
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* open / read / stat, etc.
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*/
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* File system methods */
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static int skel_open(FAR struct file *filep, FAR const char *relpath,
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int oflags, mode_t mode);
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static int skel_close(FAR struct file *filep);
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static ssize_t skel_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen);
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/* TODO: Should not support skel_write if read-only */
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static ssize_t skel_write(FAR struct file *filep, FAR const char *buffer,
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size_t buflen);
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static int skel_dup(FAR const struct file *oldp,
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FAR struct file *newp);
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static int skel_opendir(FAR const char *relpath,
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FAR struct fs_dirent_s **dir);
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static int skel_closedir(FAR struct fs_dirent_s *dir);
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static int skel_readdir(FAR struct fs_dirent_s *dir,
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FAR struct dirent *entry);
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static int skel_rewinddir(FAR struct fs_dirent_s *dir);
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static int skel_stat(FAR const char *relpath, FAR struct stat *buf);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/* See include/nutts/fs/procfs.h
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* We use the old-fashioned kind of initializers so that this will compile
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* with any compiler.
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*/
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const struct procfs_operations skel_procfsoperations =
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{
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skel_open, /* open */
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skel_close, /* close */
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skel_read, /* read */
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/* TODO: Decide if this procfs entry supports write access */
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#if 0 /* NULL if the procfs entry does not support write access. */
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NULL, /* write */
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#else
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skel_write, /* write */
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#endif
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NULL, /* poll */
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skel_dup, /* dup */
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skel_opendir, /* opendir */
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skel_closedir, /* closedir */
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skel_readdir, /* readdir */
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skel_rewinddir, /* rewinddir */
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skel_stat /* stat */
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: skel_open
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****************************************************************************/
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static int skel_open(FAR struct file *filep, FAR const char *relpath,
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int oflags, mode_t mode)
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{
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FAR struct skel_file_s *priv;
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finfo("Open '%s'\n", relpath);
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/* If PROCFS is read-only, then the (1) the skel_write() method must not
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* be provided and (2) any attempt to open with any kind of write access
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* can not be permitted.
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*/
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if (((oflags & O_WRONLY) != 0 || (oflags & O_RDONLY) == 0) &&
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(skel_procfsoperations.write == NULL))
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{
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ferr("ERROR: Only O_RDONLY supported\n");
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return -EACCES;
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}
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/* Allocate the open file structure */
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priv = kmm_zalloc(sizeof(struct skel_file_s));
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if (!priv)
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{
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ferr("ERROR: Failed to allocate file attributes\n");
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return -ENOMEM;
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}
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/* TODO: Initialize the context specific data here */
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/* Save the open file structure as the open-specific state in
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* filep->f_priv.
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*/
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filep->f_priv = (FAR void *)priv;
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return OK;
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}
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/****************************************************************************
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* Name: skel_close
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****************************************************************************/
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static int skel_close(FAR struct file *filep)
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{
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FAR struct skel_file_s *priv;
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/* Recover our private data from the struct file instance */
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priv = (FAR struct skel_file_s *)filep->f_priv;
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DEBUGASSERT(priv);
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/* Release the file attributes structure */
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kmm_free(priv);
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filep->f_priv = NULL;
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return OK;
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}
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/****************************************************************************
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* Name: skel_read
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*
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* Description:
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* Handle read from procfs file.
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*
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****************************************************************************/
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static ssize_t skel_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen)
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{
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FAR struct skel_file_s *priv;
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ssize_t ret;
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finfo("buffer=%p buflen=%d\n", buffer, (int)buflen);
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/* Recover our private data from the struct file instance */
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priv = (FAR struct skel_file_s *)filep->f_priv;
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DEBUGASSERT(priv);
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/* TODO: Provide the requested data.
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* Take into account current filep->f_pos and 'buflen'. The read
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* could require several calls to skel_read().
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*/
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ret = 0;
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/* Update the file offset */
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if (ret > 0)
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{
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filep->f_pos += ret;
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}
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return ret;
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}
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/****************************************************************************
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* Name: skel_write
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*
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* Description:
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* Handle write3 to procfs file.
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*
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****************************************************************************/
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/* TODO: Should not support skel_write if read-only */
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static ssize_t skel_write(FAR struct file *filep, FAR const char *buffer,
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size_t buflen)
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{
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FAR struct skel_file_s *priv;
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ssize_t ret;
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finfo("buffer=%p buflen=%d\n", buffer, (int)buflen);
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/* Recover our private data from the struct file instance */
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priv = (FAR struct skel_file_s *)filep->f_priv;
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DEBUGASSERT(priv);
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/* TODO: Verify that the write is within range */
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/* TODO: Handle the write data as appropriate to function of file.
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* Take into account current filep->f_pos and 'buflen' since the
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* write may require several calls to skel_write().
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*/
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ret = 0;
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/* Update the file offset */
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if (ret > 0)
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{
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filep->f_pos += ret;
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}
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return ret;
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}
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/****************************************************************************
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* Name: skel_dup
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*
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* Description:
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* Duplicate open file data in the new file structure.
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*
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****************************************************************************/
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static int skel_dup(FAR const struct file *oldp, FAR struct file *newp)
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{
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FAR struct skel_file_s *oldpriv;
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FAR struct skel_file_s *newpriv;
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finfo("Dup %p->%p\n", oldp, newp);
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/* Recover our private data from the old struct file instance */
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oldpriv = (FAR struct skel_file_s *)oldp->f_priv;
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DEBUGASSERT(oldpriv);
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/* Allocate a new container to hold the task and attribute selection */
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newpriv = kmm_zalloc(sizeof(struct skel_file_s));
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if (!newpriv)
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{
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ferr("ERROR: Failed to allocate file attributes\n");
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return -ENOMEM;
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}
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/* The copy the file attribute from the old attributes to the new */
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memcpy(newpriv, oldpriv, sizeof(struct skel_file_s));
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/* Save the new attributes in the new file structure */
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newp->f_priv = (FAR void *)newpriv;
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return OK;
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}
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/****************************************************************************
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* Name: skel_opendir
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*
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* Description:
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* Open a directory for read access
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*
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****************************************************************************/
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static int skel_opendir(FAR const char *relpath,
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FAR struct fs_dirent_s **dir)
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{
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FAR struct skel_level1_s *level1;
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finfo("relpath: \"%s\"\n", relpath ? relpath : "NULL");
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DEBUGASSERT(relpath);
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/* The path refers to the 1st level sbdirectory. Allocate the level1
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* dirent structure.
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*/
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level1 = (FAR struct skel_level1_s *)
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kmm_zalloc(sizeof(struct skel_level1_s));
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if (!level1)
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{
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ferr("ERROR: Failed to allocate the level1 directory structure\n");
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return -ENOMEM;
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}
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/* TODO: Initialize context specific data */
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/* Initialize base structure components */
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level1->base.level = 1;
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level1->base.nentries = 0;
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level1->base.index = 0;
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*dir = (FAR struct fs_dirent_s *)level1;
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return OK;
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}
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/****************************************************************************
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* Name: skel_closedir
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*
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* Description: Close the directory listing
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*
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****************************************************************************/
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static int skel_closedir(FAR struct fs_dirent_s *dir)
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{
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DEBUGASSERT(dir);
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kmm_free(dir);
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return OK;
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}
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/****************************************************************************
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* Name: skel_readdir
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*
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* Description: Read the next directory entry
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*
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****************************************************************************/
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static int skel_readdir(FAR struct fs_dirent_s *dir,
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FAR struct dirent *entry)
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{
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FAR struct skel_level1_s *level1;
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char filename[16];
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int index;
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int ret;
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DEBUGASSERT(dir);
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level1 = (FAR struct skel_level1_s *)dir;
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/* TODO: Perform device specific readdir function here. This may
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* or may not involve validating the nentries variable
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* in the base depending on the implementation.
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*/
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/* Have we reached the end of the directory */
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index = level1->base.index;
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if (index >= level1->base.nentries)
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{
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/* We signal the end of the directory by returning the special
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* error -ENOENT
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*/
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finfo("Entry %d: End of directory\n", index);
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ret = -ENOENT;
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}
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/* We are traversing a subdirectory of task attributes */
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else
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{
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DEBUGASSERT(level1->base.level == 1);
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/* TODO: Add device specific entries */
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strlcpy(filename, "dummy", sizeof(filename));
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/* TODO: Specify the type of entry */
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entry->d_type = DTYPE_FILE;
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strlcpy(entry->d_name, filename, sizeof(entry->d_name));
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/* Set up the next directory entry offset. NOTE that we could use the
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* standard f_pos instead of our own private index.
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*/
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level1->base.index = index + 1;
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ret = OK;
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}
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return ret;
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}
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/****************************************************************************
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* Name: skel_rewindir
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*
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* Description: Reset directory read to the first entry
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*
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****************************************************************************/
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static int skel_rewinddir(FAR struct fs_dirent_s *dir)
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{
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FAR struct skel_level1_s *priv;
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DEBUGASSERT(dir);
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priv = (FAR struct skel_level1_s *)dir;
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priv->base.index = 0;
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return OK;
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}
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/****************************************************************************
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* Name: skel_stat
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*
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* Description: Return information about a file or directory
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*
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****************************************************************************/
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static int skel_stat(FAR const char *relpath, FAR struct stat *buf)
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{
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int ret = -ENOENT;
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/* TODO: Decide if the relpath is valid and if it is a file
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* or a directory and set it's permissions.
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*/
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memset(buf, 0, sizeof(struct stat));
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buf->st_mode = S_IFDIR | S_IROTH | S_IRGRP | S_IRUSR;
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/* TODO: Set S_IFREG if the relpath refers to a file.
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* TODO: If the skel_write() method is supported, then stat must also
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* report S_IWOTH | S_IWGRP | S_IWUSR for files (but not for
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* directories) as well.
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* TODO: Other 'struct buf' settings may be appropriate (optional)
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*/
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ret = OK;
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return ret;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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#endif /* !CONFIG_DISABLE_MOUNTPOINT && CONFIG_FS_PROCFS */
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