Synchronous Networking

Synchronous networking proceeds similar to synchronous file and device I/O. Like the write(2) function, the request to send returns after buffering the message, but might suspend the calling process if buffer space is not immediately available. Like the read(2) function, a request to receive suspends execution of the calling process until data arrives to satisfy the request. Because SunOS provides no guaranteed bounds for transport services, synchronous networking is inappropriate for processes that must have real-time behavior with respect to other devices.