linux 文件创建函数

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

int main() {
    int fd;
    const char *filename = "example.txt";

    // 使用open()函数创建文件
    fd = open(filename, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR);
    if (fd == -1) {
        perror("Error creating file");
        return 1;
    }

    // 写入文件
    const char *content = "Hello, World!\n";
    write(fd, content, strlen(content));

    // 关闭文件
    close(fd);

    printf("File '%s' created successfully.\n", filename);
    return 0;
}

fd = open(filename, O_CREAT | O_WRONLY | O_EXCL, S_IRUSR | S_IWUSR);

umask(0); // 设置默认权限掩码为0，允许最大权限
fd = open(filename, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR);