关闭uvcdynctrl-udev.log

最新推荐文章于 2023-01-20 22:57:43 发布

原创最新推荐文章于 2023-01-20 22:57:43 发布 · 2.4k 阅读

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本文探讨了Linux系统中uvcdynctrl工具的使用与问题，特别是其生成大量日志文件导致系统资源占用的问题。文章深入解析了位于/lib/udev下的uvcdynctrl文件如何控制日志输出，提供了调试配置的详细脚本，帮助读者理解并解决uvcdynctrl的日志管理难题。

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在linux系统中使用USB摄像头时，都会用到这个uvcdynctrl，但是uvcdynctrl也会一些问题引发输出巨量的log文件，会把系统占用达到100%。

但是事实上在根目录下的lib/udev中有一个uvcdynctrl文件可以控制是否把log输出到文件。

#!/bin/sh
###################################################################################################
# udev helper script for UVC devices to support dynamic controls.
#
# Version: 0.2
#
# Note that version 0.2 no longer works with older versions of udev. This script should be
# compatible with udev >= 141.
# Also check 80-uvcdynctrl.rules for more information.
###################################################################################################

# Constants
version=0.3

# Run-time configuration
debug=0 //默认是1
uvcdynctrlpath=uvcdynctrl

# Determine log destination
if [ "$debug" != 0 ]; then
logfile=/var/log/uvcdynctrl-udev.log
else
logfile=/dev/null //写入到“黑洞”里，就是不在文件系统保存
fi

# Write log header
echo >> $logfile
echo "==============================================================================" >> $logfile
echo "uvcdynctrl script version $version running from '$0'" >> $logfile
echo "Triggered at `date`" >> $logfile
echo >> $logfile
set >> $logfile
echo >> $logfile

# Check for the udev version and bail out if it's too old
if [ -z "$ID_VENDOR_ID" ]; then
echo "ERROR: The ID_VENDOR_ID variable is not defined. You are probably using an older version of udev. Please upgrade to udev >= 141 or use version 0.1 of this script." >> $logfile
exit 2
fi

# Extract the VID and PID
vid=$ID_VENDOR_ID
pid=$ID_MODEL_ID
echo "VID of new device: '$vid'" >> $logfile
echo "PID of new device: '$pid'" >> $logfile
if [ -z $vid ]; then
echo "ERROR: Unable to extract USB VID." >> $logfile
exit 3
fi

# Check whether the device is managed by the UVC driver
if [ "$ID_USB_DRIVER" != "uvcvideo" ]; then
echo "ERROR: Device is not handled by uvcvideo but by '$ID_USB_DRIVER'." >> $logfile
if [ "$ID_USB_DRIVER" = "usb" ]; then
@

就是这么简单