In Linux/Unix system programming, buffer setting is a key concept that can significantly affect the performance and correctness of the program. However, there are some common mistakes that often occur when setting up buffering. This article describes these errors and provides solutions and sample code.
Error 1: The buffer type is not set correctly.
In Linux/Unix system programming, there are three common buffer types: full buffering, line buffering and no buffering. Full buffering is the default buffering type, and data is written to the file only after the buffer is filled. Line buffering flushes the buffer when a newline character occurs, while unbuffering writes the data to the file immediately. If the buffer type is not set correctly, data may not be written to the file in time, resulting in data loss or incompleteness.
Solution: Before using standard I/O functions (such as printf, fprintf, fscanfetc.) to output or input data, setvbufexplicitly set the buffer type by calling the function. Here's a sample code that sets a file to line buffering:
#include <stdio.h>
int main() {
FILE