c - FIONBIO 和 FIOASYNC for socket 有什么区别？

Question

似乎这两个选项都可用于使套接字非阻塞/异步？

或者非阻塞和异步之间有什么区别？

Answer 1

如果您还没有，您可以在 BSD sockets 上看到非阻塞和阻塞套接字之间的区别。维基百科页面。

另外，您可以查看 ioctlsocket() MSDN page for a few details on FIONBIO .

According to IBM :

FIOASYNC Enables a simple form of asynchronous I/O notification. This command causes the kernel to send SIGIO signal to a process or a process group when I/O is possible. Only sockets, ttys, and pseudo-ttys implement this functionality.

FIONBIO Enables nonblocking I/O. The effect is similar to setting the O_NONBLOCK flag with the fcntl subroutine. The third parameter to the ioctl subroutine for this command is a pointer to an integer that indicates whether nonblocking I/O is being enabled or disabled. A value of 0 disables non-blocking I/O.

我希望这对你有所帮助。