How to use file writing to debug a Linux application

In Linux, everything is a file, so the Android system itself is just Linux+Java, and it also runs in the Linux environment.

Usually, we use printf when debugging programs.

In Android, we will use logcat. Now, I will introduce you to a commonly used debugging method, the debug writing file debugging method.

In the Android system, debugging a C application is extremely inconvenient. In order to preserve the integrity of the log, the file debugging method can play a significant role. Here is an example:

#include <stdio.h>
FILE * write_debug_file=NULL;
//Write debug information to file void write_Debug_to_file(char *debug_log)
{
 if(write_debug_file==NULL)
 wirte_debug_file = fopen("debug.txt","wt");
 if(write_debug_file==NULL)
 return;
 fputs(debug_log,write_debug_file);
}
int main(void)
{
 int i ;
 char buf[100];
 for(i = 0 ; i < 10 ; i++)
 {
 sprintf(buf,"i:%d\n",i);
 //Write debug information write_Debug_to_file(buf);
 }
 if(write_debug_file != NULL)
 fclose(write_debug_file);
 return 0 ;
}

Running results:

After we open debug.txt, we can see:

i:0
i:1
i:2
i:3
i:4
i:5
i:6
i:7
i:8
i:9

The printed data is saved in this file. We can even write any sentence in the code segment into the log and analyze the problem later.

This is a very good debugging tool.

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