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Plan 9 - man page for stream (plan9 section 3)

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STREAM(3)										STREAM(3)

       stream - a structure for communications

       bind streamdevice dir


       A  stream  is  not  a device per se.  However, many devices use the streams package in the
       kernel to implement communications channels.  The properties described here are common  to
       all such channels.

       All  streams are represented by two standard files, ctl and data, plus any others the par-
       ticular device wants to add.  Reading and writing the data file receives and sends data on
       the  channel.  If the channel is message oriented, each write will represent a message and
       each read will return at most one message.  If the buffer given in a read is smaller  than
       the message, subsequent reads will return the remainder of the message.

       Writing textual command strings to the ctl file performs control operations on the stream.
       The strings need not be null-terminated.  Each device may add to the  control  operations.
       The common control operations are:

       hangup	     Hang up this stream.  Any subsequent writes will return an error.	The first
		     subsequent read will return 0.  All following ones will return an error.

       push name     Push the module name onto the top of the stream.

       pop	     Pop the top module off the stream

       Reading the ctl file returns a textual identifier for the stream.  This is used by  multi-
       plexed devices and its use is described with the particular device.

       pipe(3), dk(3), cons(3), async(3), fcall(3), ip(3), reboot(3)


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