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Annotation of researchv10dc/dist/man/v3/man2/pipe.2, revision 1.1

1.1     ! root        1: .pa 1
        !             2: .he 'PIPE (II)'1/15/73'PIPE (II)'
        !             3: .ti 0
        !             4: NAME           pipe -- create a pipe
        !             5: .sp
        !             6: .ti 0
        !             7: SYNOPSIS       sys pipe        / pipe = 42.; not in assembler
        !             8: .br
        !             9: (file descriptor in r0)
        !            10: .sp
        !            11: .ti 0
        !            12: DESCRIPTION    The
        !            13: pipe____
        !            14: system call
        !            15: creates an I/O mechanism called a pipe.
        !            16: The file descriptor returned can
        !            17: be used in both read and write operations.
        !            18: When the pipe is written,
        !            19: the data is buffered up to 504 bytes
        !            20: at which time the writing process is suspended.
        !            21: A read on the pipe will pick up the buffered data.
        !            22: .sp
        !            23: It is assumed that after the
        !            24: pipe____ has been set up,
        !            25: two (or more)
        !            26: cooperating processes
        !            27: (created by subsequent fork____ calls)
        !            28: will pass data through the
        !            29: pipe with read____ and write_____ calls.
        !            30: 
        !            31: The shell has a syntax
        !            32: to set up a linear array of processes
        !            33: connected by pipes.
        !            34: .sp
        !            35: Read calls on an empty
        !            36: pipe (no buffered data) with only one end
        !            37: (no synonymous file
        !            38: descriptors resulting from fork____ or dup___)
        !            39: return an end-of-file.
        !            40: Write calls under similar conditions are ignored.
        !            41: 
        !            42: .ti 0
        !            43: SEE ALSO       sh(I), read(II), write(II), fork(II)
        !            44: .sp
        !            45: .ti 0
        !            46: DIAGNOSTICS    The error
        !            47: bit (c-bit) is set if
        !            48: 10 files are already open.
        !            49: .sp
        !            50: .ti 0
        !            51: BUGS           --

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