20091101-2150

forsyth committed 17 years ago

Commit 400101d1 parent 0aaf75e1 file · +21 −8Browse files

Unified · Split

@@ -120,20 +120,33 @@ is an empty or · 119 unmodified lines
120	120	.B nil
121	121	string or an explanation of the problem.
122	122	.PP
123		−If the client closes the file for reading (writing), the server will receive a
124		−.B read
125		−.RB ( write )
126		−message with a
127		−.B nil
128		−.I rc
129		−.BI ( wc )\f1.
130		−The server can use these signals to determine when to stop processing.
131	123	The
132	124	.I fid
133	125	received by the server can be used to manage the multiplexing of multiple
134	126	active clients sharing a single file; see
135	127	.IR intro (5)
136	128	for details.
	129	+Each distinct
	130	+open of the file will yield a distinct
	131	+.IR fid ,
	132	+unique to that open, which will appear in the read and write
	133	+messages corresponding to reads and writes on that open instance of the file.
	134	+.PP
	135	+When the client closes the file,
	136	+the server will be sent a
	137	+.B read
	138	+message with a nil
	139	+.IR rc ,
	140	+then a
	141	+.B write
	142	+message with a nil
	143	+.IR wc .
	144	+A server typically ignores the former and uses the latter as a signal to stop processing for the given client
	145	+(more precisely, the given
	146	+.IR fid ).
	147	+Note that the
	148	+.I fid
	149	+can later be re-used by another client.
137	150	.SH SOURCE
138	151	.B /emu/port/devsrv.c
139	152	.br