linux 内核 写文件

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

int main() {
    int fd;
    const char *filename = "example.txt";
    const char *data = "Hello, World!\n";

    // 打开文件，如果文件不存在则创建，使用写入模式
    fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0644);
    if (fd == -1) {
        perror("Error opening file");
        return EXIT_FAILURE;
    }

    // 写入数据
    ssize_t bytes_written = write(fd, data, strlen(data));
    if (bytes_written == -1) {
        perror("Error writing to file");
        close(fd);
        return EXIT_FAILURE;
    }

    // 关闭文件
    if (close(fd) == -1) {
        perror("Error closing file");
        return EXIT_FAILURE;
    }

    printf("Data written to %s successfully.\n", filename);
    return EXIT_SUCCESS;
}