[学习笔记]通过open函数改变标准输出的方法

int main(void)
{
    char s[] = "abc.txt";
    int i = 0;

    close(STDOUT_FILENO);//关闭标准输出文件描述符
    int fd1 = open("/dev/pts/1", O_WRONLY);//打开设备文件/dev/pts/1，该设备将做为标准输出文件描述符
    int fd = open(s, O_RDONLY);//
    if (-1 == fd)
    {
        printf("%s\n", strerror(errno));//
    }
    else
    {
        while(1)
        {
            printf("fd1 = %d, fd = %d:%d\n", fd1, fd, i++);//printf语句将会打印到/dev/pts/1上
            sleep(1);//
        }
        close(fd);
    }
    return EXIT_SUCCESS;
}