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synced 2026-05-28 11:56:10 +08:00
Support /proc/uptime
This commit is contained in:
Gregory Nutt
@@ -35,6 +35,10 @@ config FS_PROCFS_EXCLUDE_PROCESS
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This will reduce code space, but then giving access to process info
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was kinda the whole point of procfs, but hey, whatever.
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config FS_PROCFS_EXCLUDE_UPTIME
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bool "Exclude uptime"
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default n
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config FS_PROCFS_EXCLUDE_PARTITIONS
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bool "Exclude partitions"
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depends on MTD_PARTITION
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+1
-1
@@ -37,7 +37,7 @@ ifeq ($(CONFIG_FS_PROCFS),y)
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# Files required for procfs file system support
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ASRCS +=
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CSRCS += fs_procfs.c fs_procfsproc.c fs_procfsutil.c
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CSRCS += fs_procfs.c fs_procfsutil.c fs_procfsproc.c fs_procfsuptime.c
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# Include procfs build support
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@@ -76,6 +76,7 @@
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****************************************************************************/
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extern const struct procfs_operations process_operations;
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extern const struct procfs_operations uptime_operations;
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extern const struct procfs_operations mtd_procfsoperations;
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extern const struct procfs_operations part_procfsoperations;
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extern const struct procfs_operations smartfs_procfsoperations;
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@@ -101,6 +102,9 @@ static const struct procfs_entry_s g_procfsentries[] =
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#if defined(CONFIG_MTD_PARTITION) && !defined(CONFIG_FS_PROCFS_EXCLUDE_PARTITON)
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{ "partitions", &part_procfsoperations },
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#endif
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#if !defined(CONFIG_FS_PROCFS_EXCLUDE_UPTIME)
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{ "uptime", &uptime_operations },
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#endif
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};
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static const uint8_t g_procfsentrycount = sizeof(g_procfsentries) /
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@@ -68,6 +68,9 @@
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Determines the size of an intermeidate 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 STATUS_LINELEN 32
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@@ -344,7 +347,7 @@ static ssize_t process_status(FAR struct process_file_s *attr,
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return totalsize;
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}
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/* Show the signal mast */
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/* Show the signal mask */
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#ifndef CONFIG_DISABLE_SIGNALS
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linesize = snprintf(attr->line, STATUS_LINELEN, "%-12s%08x\n", "SigMask:",
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@@ -0,0 +1,359 @@
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/****************************************************************************
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* fs/procfs/fs_procfsuptime.c
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*
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* Copyright (C) 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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/statfs.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 <time.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/clock.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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#ifndef CONFIG_FS_PROCFS_EXCLUDE_PROCESS
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Determines the size of an intermeidate 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 UPTIME_LINELEN 16
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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 uptime_file_s
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{
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struct procfs_file_s base; /* Base open file structure */
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char line[UPTIME_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 uptime_open(FAR struct file *filep, FAR const char *relpath,
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int oflags, mode_t mode);
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static int uptime_close(FAR struct file *filep);
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static ssize_t uptime_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen);
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static int uptime_dup(FAR const struct file *oldp,
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FAR struct file *newp);
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static int uptime_stat(FAR const char *relpath, FAR struct stat *buf);
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/****************************************************************************
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* Private Variables
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****************************************************************************/
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/****************************************************************************
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* Public Variables
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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 uptime_operations =
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{
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uptime_open, /* open */
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uptime_close, /* close */
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uptime_read, /* read */
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NULL, /* write */
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uptime_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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uptime_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: uptime_open
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****************************************************************************/
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static int uptime_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 uptime_file_s *attr;
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fvdbg("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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fdbg("ERROR: Only O_RDONLY supported\n");
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return -EACCES;
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}
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/* "uptime" is the only acceptable value for the relpath */
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if (strcmp(relpath, "uptime") != 0)
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{
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fdbg("ERROR: relpath is '%s'\n", relpath);
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return -ENOENT;
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}
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/* Allocate a container to hold the file attributes */
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attr = (FAR struct uptime_file_s *)kzalloc(sizeof(struct uptime_file_s));
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if (!attr)
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{
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fdbg("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: uptime_close
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****************************************************************************/
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static int uptime_close(FAR struct file *filep)
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{
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FAR struct uptime_file_s *attr;
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/* Recover our private data from the struct file instance */
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attr = (FAR struct uptime_file_s *)filep->f_priv;
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DEBUGASSERT(attr);
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/* Release the file attributes structure */
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kfree(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: uptime_read
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****************************************************************************/
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static ssize_t uptime_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 uptime_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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#ifdef CONFIG_SYSTEM_TIME64
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/* 32-bit timer */
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uint64_t upticks = clock_systimer64();
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#if defined(CONFIG_HAVE_DOUBLE) && defined(CONFIG_LIBC_FLOATINGPOINT)
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double now = (double)upticks / (double)CLOCKS_PER_SEC;
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#else
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uint64_t sec = upticks / CLOCKS_PER_SEC;
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unsigned int remainder = (unsigned int)(upticks % CLOCKS_PER_SEC);
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unsigned int csec = (100 * remainder + (CLOCKS_PER_SEC / 2)) / CLOCKS_PER_SEC;
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#endif
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#else
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/* 32-bit timer */
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uint32_t upticks = clock_systimer();
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#if defined(CONFIG_HAVE_DOUBLE) && defined(CONFIG_LIBC_FLOATINGPOINT)
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double now = (double)upticks / (double)CLOCKS_PER_SEC;
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#else
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uint32_t sec = upticks / CLOCKS_PER_SEC;
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unsigned int remainder = (unsigned int)(upticks % CLOCKS_PER_SEC);
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unsigned int csec = (100 * remainder + (CLOCKS_PER_SEC / 2)) / CLOCKS_PER_SEC;
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#endif
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#endif
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fvdbg("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 uptime_file_s *)filep->f_priv;
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DEBUGASSERT(attr);
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#if defined(CONFIG_HAVE_DOUBLE) && defined(CONFIG_LIBC_FLOATINGPOINT)
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/* Convert the system up time to seconds + hundredths of seconds */
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linesize = snprintf(attr->line, UPTIME_LINELEN, "%10.2f\n", now);
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#else
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/* Make sure that rounding did not force the hundredths of a second above 99 */
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if (csec > 99)
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{
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sec++;
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csec -= 100;
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}
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/* Convert the system up time to seconds + hundredths of seconds */
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linesize = snprintf(attr->line, UPTIME_LINELEN, "%7lu.%02u\n", sec, csec);
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#endif
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/* Transfer the system up time to user receive buffer */
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offset = filep->f_pos;
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ret = procfs_memcpy(attr->line, 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: uptime_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 uptime_dup(FAR const struct file *oldp, FAR struct file *newp)
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{
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FAR struct uptime_file_s *oldattr;
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FAR struct uptime_file_s *newattr;
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fvdbg("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 uptime_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 uptime_file_s *)kzalloc(sizeof(struct uptime_file_s));
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if (!newattr)
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{
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fdbg("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 attribtes from the old attributes to the new */
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memcpy(&newattr->base, &oldattr->base, sizeof(struct procfs_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: uptime_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 uptime_stat(const char *relpath, struct stat *buf)
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{
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int ret;
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/* "uptime" is the only acceptable value for the relpath */
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if (strcmp(relpath, "uptime") != 0)
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{
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fdbg("ERROR: relpath is '%s'\n", relpath);
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return -ENOENT;
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}
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/* "uptime" is the name for a read-only file */
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buf->st_mode = S_IFREG|S_IROTH|S_IRGRP|S_IRUSR;
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buf->st_size = 0;
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buf->st_blksize = 0;
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buf->st_blocks = 0;
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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_FS_PROCFS_EXCLUDE_PROCESS */
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#endif /* !CONFIG_DISABLE_MOUNTPOINT && CONFIG_FS_PROCFS */
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