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Annotation of researchv10dc/dist/man/v4/man2/pipe.2, revision 1.1

1.1     ! root        1: .th PIPE II 8/5/73
        !             2: .sh NAME
        !             3: pipe \*- create a pipe
        !             4: .sh SYNOPSIS
        !             5: (pipe = 42.)
        !             6: .br
        !             7: .ft B
        !             8: sys pipe
        !             9: .br
        !            10: .ft R
        !            11: (read file descriptor in r0)
        !            12: .br
        !            13: (write file descriptor in r1)
        !            14: .s3
        !            15: .ft B
        !            16: pipe(fildes)
        !            17: .br
        !            18: int fildes[2];
        !            19: .ft R
        !            20: .sh DESCRIPTION
        !            21: The
        !            22: .it pipe
        !            23: system call
        !            24: creates an I/O mechanism called a pipe.
        !            25: The file descriptors returned can
        !            26: be used in read and write operations.
        !            27: When the pipe is written using the descriptor
        !            28: returned in r1 (resp. fildes[1]),
        !            29: up to 4096 bytes of data are buffered
        !            30: before the writing process is suspended.
        !            31: A read using the descriptor returned in r0
        !            32: (resp. fildes[0])
        !            33: will pick up the data.
        !            34: .s3
        !            35: It is assumed that after the
        !            36: pipe has been set up,
        !            37: two (or more)
        !            38: cooperating processes
        !            39: (created by subsequent
        !            40: .it fork
        !            41: calls)
        !            42: will pass data through the
        !            43: pipe with
        !            44: .it read
        !            45: and
        !            46: .it write
        !            47: calls.
        !            48: .s3
        !            49: The shell has a syntax
        !            50: to set up a linear array of processes
        !            51: connected by pipes.
        !            52: .s3
        !            53: Read calls on an empty
        !            54: pipe (no buffered data) with only one end
        !            55: (all write file descriptors closed)
        !            56: return an end-of-file.
        !            57: Write calls under similar conditions are ignored.
        !            58: .sh "SEE ALSO"
        !            59: sh(I), read(II), write(II), fork(II)
        !            60: .sh DIAGNOSTICS
        !            61: The error
        !            62: bit (c-bit) is set if
        !            63: more than
        !            64: 8 files are already open.
        !            65: From C, a \*-1 returned value
        !            66: indicates an error.

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