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authorandreas_kupries <akupries@shaw.ca>2001-09-14 19:20:39 (GMT)
committerandreas_kupries <akupries@shaw.ca>2001-09-14 19:20:39 (GMT)
commite670c6f17e7ac704c3c6f117912e45313254d4d9 (patch)
tree601c942962a61099835ec8cca4eb537578460b9d /doc/read.n
parent1aa543f158267b3810d76b69186f8aa94aec2c84 (diff)
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* doc/gets.n:
* doc/read.n: * doc/puts.n: * doc/flush.n: * doc/fconfigure.n: * doc/flush.n: * doc/eof.n: * doc/seek.n: * doc/tell.n: * doc/close.n: * doc/fileevent.n: Added references to the Tcl standard channels. Item [219250], reported by David LeBlanc <whisper@oz.net>. Thanks to Christopher Nelson <chris@pinebush.com> for doing editorial work.
Diffstat (limited to 'doc/read.n')
-rw-r--r--doc/read.n18
1 files changed, 12 insertions, 6 deletions
diff --git a/doc/read.n b/doc/read.n
index 66dba85..b80f134 100644
--- a/doc/read.n
+++ b/doc/read.n
@@ -5,7 +5,7 @@
'\" See the file "license.terms" for information on usage and redistribution
'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
'\"
-'\" RCS: @(#) $Id: read.n,v 1.6 2001/04/06 14:27:51 dkf Exp $
+'\" RCS: @(#) $Id: read.n,v 1.7 2001/09/14 19:20:40 andreas_kupries Exp $
'\"
.so man.macros
.TH read n 8.1 Tcl "Tcl Built-In Commands"
@@ -32,6 +32,14 @@ the channel is configured to use a multi-byte encoding, then the
number of characters read may not be the same as the number of bytes
read.
.PP
+.VS
+\fIChannelId\fR must be an identifier for an open channel such as the
+Tcl standard input channel (\fBstdin\fR), the return value from an
+invocation of \fBopen\fR or \fBsocket\fR, or the result of a channel
+creation command provided by a Tcl extension. The channel must have
+been opened for input.
+.VE
+.PP
If \fIchannelId\fR is in nonblocking mode, the command may not read as
many characters as requested: once all available input has been read,
the command will return the data that is available rather than
@@ -50,27 +58,25 @@ which \fBfconfigure\fR will alter input.
.SH "USE WITH SERIAL PORTS"
'\" Note: this advice actually applies to many versions of Tcl
-.VS 8.4
+
For most applications a channel connected to a serial port should be
configured to be nonblocking: \fBfconfigure \fIchannelId \fB\-blocking
\fI0\fR. Then \fBread\fR behaves much like described above. Care
must be taken when using \fBread\fR on blocking serial ports:
.TP
\fBread \fIchannelId numChars\fR
-.
In this form \fBread\fR blocks until \fInumChars\fR have been received
from the serial port.
.TP
\fBread \fIchannelId\fR
-.
In this form \fBread\fR blocks until the reception of the end-of-file
character, see \fBfconfigure -eofchar\fR. If there no end-of-file
character has been configured for the channel, then \fBread\fR will
block forever.
-.VE
+
.SH "SEE ALSO"
-file(n), eof(n), fblocked(n), fconfigure(n)
+file(n), eof(n), fblocked(n), fconfigure(n), Tcl_StandardChannels(3)
.SH KEYWORDS
blocking, channel, end of line, end of file, nonblocking, read, translation, encoding