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.TH BUFIO-CHANFILL 2
.SH NAME
bufio: chanfill \- buffered I/O interface to named channel
.SH SYNOPSIS
.EX
include "bufio.m";
chanfill := load ChanFill ChanFill->PATH;
init: fn(data: array of byte, fid: int,
wc: Sys->Rwrite, r: ref Sys->FileIO,
b: Bufio): ref Bufio->Iobuf;
fill: fn(b: ref Bufio->Iobuf): int;
.EE
.SH DESCRIPTION
.B ChanFill
is an implementation of
.B BufioFill
(see
.IR bufio (2))
that refills an
.B Iobuf
as data is written to a file created by
.IR sys-file2chan (2),
which is allowed only one writer.
.B Init
returns an
.B Iobuf
allocated from the
.B Bufio
instance
.IR b ,
that when read will return data written to the file by another process.
.IR Data ,
.IR fid
and
.IR wc
are the values in the tuple presented by
.B Sys->file2chan
on the first write.
.I Data
becomes the initial data for the
.BR Iobuf ;
.B init
replies to the writer on
.IR wc .
The other values are saved for use by
.BR fill :
on later calls to
by
.B Bufio
to refill the buffer,
.B fill
waits for a new write request on
.IB fio .write
and either fills the buffer or signals end-of-file appropriately.
.SH SEE ALSO
.IR bufio (2)
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