Unix系统编程:文件打开错误

Question

我正在尝试打开一个在open命令之前创建的文件。但它在open()命令行挂起。你有什么想法吗？

if(mkfifo("test", S_IRWXU | S_IRWXG | S_IRWXO))
{
    printf("File creation error.\n");
    return 0;
}

// Hangs below
while (((test_fd = open("test", O_RDONLY)) == -1) && (errno == EINTR));

Answer 1

来自mkfifo的手册页：

 Opening a FIFO for reading normally blocks until some other process opens  the  same  FIFO for  writing,  and vice versa.
 See fifo(7) for nonblocking handling of FIFO special files.