STREAMS Programming Guide by Inc. Sun Microsystems

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STREAMS modules and drivers must explicitly place messages on a queue, for example, when flow control is used. Each open driver or pushed module has a pair of queues allocated, one for the read side and one for the write side. Queues are always allocated in pairs. Kernel routines are available to access each queue’s mate. The queue’s put or service procedure can add a message to the current queue. If a module does not need to queue messages, its put procedure can call the neighboring queue’s put procedure.

The source address is then set and the number of bytes of data is returned. The example presented is a simplified service interface. It shows typical uses of putmsg(2) and getmsg(2). The state transition rules for the interface are not presented and this example does not handle expedited data. 56 STREAMS Programming Guide • May 2002 Input and Output Polling This section describes the synchronous polling mechanism and asynchronous event notification in STREAMS. User processes can efficiently monitor and control multiple streams with two system calls: poll(2) and the I_SETSIG ioctl(2) command.

Session Each process group is a member of a session that is identified by a session ID. Session ID A positive integer that uniquely identifies each session in the system. It is the same as the process ID of its session leader (POSIX). Session leader A process whose session ID is the same as its process and process group ID. Session lifetime A period that begins when the session is created by its session leader and ends when the lifetime of the last process group that is a member of the session ends.

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