[学习笔记]通过open函数改变标准输出的方法

 1 int main(void)
 2 {
 3     char s[] = "abc.txt";
 4     int i = 0;
 5 
 6     close(STDOUT_FILENO);//关闭标准输出文件描述符
 7     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
 8     int fd = open(s, O_RDONLY);//
 9     if (-1 == fd)
10     {
11         printf("%s\n", strerror(errno));//
12     }
13     else
14     {
15         while(1)
16         {
17             printf("fd1 = %d, fd = %d:%d\n", fd1, fd, i++);//printf语句将会打印到/dev/pts/1上
18             sleep(1);//
19         }
20         close(fd);
21     }
22     return EXIT_SUCCESS;
23 }