How does the system log in Kirin OS provide operating status and error troubleshooting?

How does the system log in Kirin Operating System provide operating status and error troubleshooting?

Introduction:
Kirin operating system is an operating system independently developed by Huawei of China that is suitable for a variety of devices. In the actual use process, we often encounter some operating problems and errors. At this time, the system log plays an important role. This article will introduce how to use system logs in Kirin Operating System and provide some code examples to help users better understand the functions and usage of system logs.

1. The role of the system log
The system log is an important tool in the Kirin operating system for recording operating conditions and errors. By viewing the system log, we can understand the running status of the system, including the execution of various operations, resource usage, etc. At the same time, system logs can also help us diagnose and troubleshoot errors. By analyzing the error information in the logs, we can locate and solve problems.

2. Obtaining system logs
In the Kirin operating system, obtaining system logs can be achieved by calling relevant API functions. Here is a simple code example that shows how to get the system log and output it to the screen:

#include <stdio.h>
#include <syslog.h>

int main()
{
    openlog("example", LOG_CONS | LOG_PID, LOG_USER);
    syslog(LOG_INFO, "This is a test message");
    closelog();
    
    return 0;
}

In the above code, we first call the openlog function to open the system log, And specify an identifier "example", then use the syslog function to write a message to the log, and finally call the closelog function to close the system log.

3. Viewing system logs
In Kirin operating system, we can view system logs through command line tools or graphical interface tools. The following are some commonly used commands to view system logs:

1. Use the dmesg command to view the kernel log:

   dmesg

2. Use journalctlCommand to view system logs:

   journalctl

3. Use the less command to view specific log files, such as /var/log/syslog:

   less /var/log/syslog

4. Analysis and troubleshooting of system logs
When we encounter a problem, analyzing the system log can help us locate and solve the problem. Here is a simple example that shows how to analyze error messages in the system log:

#include <stdio.h>
#include <syslog.h>

int main()
{
    openlog("example", LOG_CONS | LOG_PID, LOG_USER);
    syslog(LOG_ERR, "This is an error message");
    closelog();
    
    return 0;
}

In the above code, we use the syslog function to write an error message to the log. This error message will be logged to the system log when the program is running. We can find this error message by checking the system log and further analyze and solve the problem.

Summary:
The system log provides important running status and error troubleshooting functions in the Kirin operating system. By rationally using system logs, we can better understand the working status of the system, troubleshoot and solve problems in a timely manner, and improve the stability and reliability of the system. I hope this article can help readers to better use the system log in Kirin operating system.

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