282 lines
8.4 KiB
C
282 lines
8.4 KiB
C
/****************************************************************************
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* fs/procfs/fs_procfstcbinfo.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 <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/kmalloc.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/fs/procfs.h>
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#if !defined(CONFIG_DISABLE_MOUNTPOINT) && defined(CONFIG_FS_PROCFS)
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#ifdef CONFIG_DEBUG_TCBINFO
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Determines the size of an intermediate buffer that must be large enough
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* to handle the longest line generated by this logic.
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*/
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#define TCBINFO_LINELEN 128
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/* This structure describes one open "file" */
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struct tcbinfo_file_s
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{
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struct procfs_file_s base; /* Base open file structure */
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unsigned int linesize; /* Number of valid characters in line[] */
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char line[TCBINFO_LINELEN]; /* Pre-allocated buffer for formatted lines */
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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 tcbinfo_open(FAR struct file *filep, FAR const char *relpath,
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int oflags, mode_t mode);
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static int tcbinfo_close(FAR struct file *filep);
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static ssize_t tcbinfo_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen);
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static int tcbinfo_dup(FAR const struct file *oldp,
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FAR struct file *newp);
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static int tcbinfo_stat(FAR const char *relpath, FAR struct stat *buf);
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/* See fs_mount.c -- this structure is explicitly externed there.
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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 tcbinfo_operations =
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{
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tcbinfo_open, /* open */
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tcbinfo_close, /* close */
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tcbinfo_read, /* read */
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NULL, /* write */
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tcbinfo_dup, /* dup */
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NULL, /* opendir */
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NULL, /* closedir */
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NULL, /* readdir */
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NULL, /* rewinddir */
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tcbinfo_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: tcbinfo_open
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****************************************************************************/
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static int tcbinfo_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 tcbinfo_file_s *attr;
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finfo("Open '%s'\n", relpath);
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/* PROCFS is read-only. Any attempt to open with any kind of write
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* access is not permitted.
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*
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* REVISIT: Write-able proc files could be quite useful.
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*/
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if ((oflags & O_WRONLY) != 0 || (oflags & O_RDONLY) == 0)
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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 a container to hold the file attributes */
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attr = (FAR struct tcbinfo_file_s *)
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kmm_zalloc(sizeof(struct tcbinfo_file_s));
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if (attr == NULL)
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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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/* Save the attributes as the open-specific state in filep->f_priv */
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filep->f_priv = (FAR void *)attr;
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return OK;
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}
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/****************************************************************************
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* Name: tcbinfo_close
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****************************************************************************/
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static int tcbinfo_close(FAR struct file *filep)
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{
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FAR struct tcbinfo_file_s *attr;
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/* Recover our private data from the struct file instance */
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attr = (FAR struct tcbinfo_file_s *)filep->f_priv;
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DEBUGASSERT(attr);
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/* Release the file attributes structure */
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kmm_free(attr);
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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: tcbinfo_read
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****************************************************************************/
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static ssize_t tcbinfo_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 tcbinfo_file_s *attr;
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size_t linesize;
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off_t offset;
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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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attr = (FAR struct tcbinfo_file_s *)filep->f_priv;
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DEBUGASSERT(attr);
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if (filep->f_pos == 0)
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{
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linesize = procfs_snprintf(attr->line, TCBINFO_LINELEN,
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"pointer %p size %d\n", g_tcbinfo,
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sizeof(struct tcbinfo_s));
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/* Save the linesize in case we are re-entered with f_pos > 0 */
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attr->linesize = linesize;
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}
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offset = filep->f_pos;
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ret = procfs_memcpy(attr->line, attr->linesize, buffer, buflen, &offset);
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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: tcbinfo_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 tcbinfo_dup(FAR const struct file *oldp, FAR struct file *newp)
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{
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FAR struct tcbinfo_file_s *oldattr;
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FAR struct tcbinfo_file_s *newattr;
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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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oldattr = (FAR struct tcbinfo_file_s *)oldp->f_priv;
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DEBUGASSERT(oldattr);
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/* Allocate a new container to hold the task and attribute selection */
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newattr = (FAR struct tcbinfo_file_s *)
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kmm_malloc(sizeof(struct tcbinfo_file_s));
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if (!newattr)
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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 attributes from the old attributes to the new */
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memcpy(newattr, oldattr, sizeof(struct tcbinfo_file_s));
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/* Save the new attributes in the new file structure */
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newp->f_priv = (FAR void *)newattr;
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return OK;
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}
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/****************************************************************************
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* Name: tcbinfo_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 tcbinfo_stat(FAR const char *relpath, FAR struct stat *buf)
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{
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/* "tcbinfo" is the name for a read-only file */
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memset(buf, 0, sizeof(struct stat));
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buf->st_mode = S_IFREG | S_IROTH | S_IRGRP | S_IRUSR;
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return OK;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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#endif /* CONFIG_DEBUG_TCBINFO */
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#endif /* !CONFIG_DISABLE_MOUNTPOINT && CONFIG_FS_PROCFS */
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