如何在C中使用read()函数读取大文件

ssize_t read(int fd, void *buf, size_t count);

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>

#define BUFFER_SIZE 4096

int main() {
    int fd;
    char buffer[BUFFER_SIZE];
    ssize_t bytesRead;

    // 打开文件
    fd = open("large_file.txt", O_RDONLY);
    if (fd == -1) {
        perror("Failed to open file");
        exit(EXIT_FAILURE);
    }

    // 读取文件内容
    while ((bytesRead = read(fd, buffer, BUFFER_SIZE)) > 0) {
        // 处理读取的数据
        // ...

        // 清空缓冲区
        memset(buffer, 0, BUFFER_SIZE);
    }

    // 检查读取是否出错
    if (bytesRead == -1) {
        perror("Failed to read file");
        exit(EXIT_FAILURE);
    }

    // 关闭文件
    close(fd);

    return 0;
}