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Annotation of lucent/sys/man/3/async, revision 1.1

1.1     ! root        1: .TH ASYNC 3 
        !             2: .SH NAME
        !             3: async \- framing for a serial line to Datakit
        !             4: .SH SYNOPSIS
        !             5: .nf
        !             6: .B
        !             7: ctlfd = open(".../ctl", ORDWR);
        !             8: .B
        !             9: write(ctlfd, "push async", 10);
        !            10: .fi
        !            11: .SH DESCRIPTION
        !            12: .PP
        !            13: This is not a device, but rather a
        !            14: .I stream module
        !            15: (see
        !            16: .IR stream (3))
        !            17: that can be pushed onto a stream.
        !            18: This module provides the framing necessary to treat
        !            19: a serial line as a Datakit trunk.
        !            20: It is usually pushed onto a stream before the
        !            21: .I dkmux
        !            22: module.
        !            23: The frame includes a CRC.
        !            24: Any received frames with an incorrect CRC are
        !            25: discarded.
        !            26: .PP
        !            27: The format of a message upstream of the module is:
        !            28: .IP
        !            29: channel # low byte
        !            30: .br
        !            31: channel # high byte
        !            32: .br
        !            33: control byte (0 means none)
        !            34: .br
        !            35: data bytes
        !            36: .LP
        !            37: The format of a frame is:
        !            38: .IP
        !            39: .B 0x7d        
        !            40: .br
        !            41: .B 0x7d
        !            42: .br
        !            43: channel # low byte
        !            44: .br
        !            45: channel # high byte
        !            46: .br
        !            47: crc low byte
        !            48: .br
        !            49: crc high byte
        !            50: .br
        !            51: .B 0x7d        
        !            52: .br
        !            53: .B 0x7d
        !            54: .LP
        !            55: All control bytes in the frame are preceded by a
        !            56: .B 0x9d
        !            57: byte.
        !            58: All
        !            59: .B 0x9d
        !            60: and
        !            61: .B 0x7d
        !            62: bytes in the data are followed by a
        !            63: .B 0x00
        !            64: byte to distinguish them from framing or control
        !            65: specifiers.
        !            66: .SH "SEE ALSO"
        !            67: .IR stream (3),
        !            68: .IR cons (3),
        !            69: .IR dk (3)
        !            70: .SH SOURCE
        !            71: .B /sys/src/9/port/stasync.c

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