BUFIO-CHANFILL(2)BUFIO-CHANFILL(2)NAME
bufio: chanfill - buffered I/O interface to named channel
SYNOPSIS
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;
DESCRIPTION
ChanFill is an implementation of BufioFill (see bufio(2)) that refills
an Iobuf as data is written to a file created by sys-file2chan(2),
which is allowed only one writer. Init returns an Iobuf allocated from
the Bufio instance b, that when read will return data written to the
file by another process. Data, fid and wc are the values in the tuple
presented by Sys->file2chan on the first write. Data becomes the ini‐
tial data for the Iobuf; init replies to the writer on wc. The other
values are saved for use by fill: on later calls to by Bufio to refill
the buffer, fill waits for a new write request on fio.write and either
fills the buffer or signals end-of-file appropriately.
SEE ALSObufio(2)BUFIO-CHANFILL(2)
