Plan 9 - man page for pipe (plan9 section 3)
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pipe - two-way interprocess communication
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An attach(5) of this device allocates two new streams joined at the device end. X/data
and x/ctl are the data and control channels of one stream and x/data1 and x/ctl1 are the
data and control channels of the other stream.
Data written to one channel becomes available for reading at the other. Write boundaries
are preserved: each read terminates when the read buffer is full or after reading the last
byte of a write, whichever comes first.
Written data is buffered in kernel stream blocks. The writer will block once the stream
is full, typically after 32768 bytes or 16 writes. The writer will resume once the stream
is less than half full.
If there are multiple writers, each write is guaranteed to be available in a contiguous
piece at the other end of the pipe. If there are multiple readers, each read will return
data from only one write.
The pipe(2) system call performs an attach of this device and returns file descriptors to
the new pipe's data and data1 files. The files are open with mode ORDWR.
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