IPC system calls
These system calls connect processes so they can communicate.
pipe is the system call for creating an interprocess channel.
dup is the call for duplicating an open file descriptor.
(These IPC mechanisms are not applicable for processes on separate hosts.)
Basic interprocess communication functions
pipe
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open file-descriptors for a pipe
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dup
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duplicate an open file-descriptor
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UnixWare 7 Release 7.1.4 - 27 April 2004