diff options
Diffstat (limited to 'doc/socket.n')
| -rw-r--r-- | doc/socket.n | 32 |
1 files changed, 29 insertions, 3 deletions
diff --git a/doc/socket.n b/doc/socket.n index 70167f8..35d7671 100644 --- a/doc/socket.n +++ b/doc/socket.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: socket.n,v 1.9 2003/05/15 18:41:17 hobbs Exp $ +'\" RCS: @(#) $Id: socket.n,v 1.10 2004/04/16 12:58:52 dkf Exp $ .so man.macros .TH socket n 8.0 Tcl "Tcl Built-In Commands" .BS @@ -47,7 +47,7 @@ to connect to; there must be a server accepting connections on this port. \fIPort\fR is an integer port number (or service name, where supported and understood by the host operating system) and \fIhost\fR -is either a domain-style name such as \fBwww.sunlabs.com\fR or +is either a domain-style name such as \fBwww.tcl.tk\fR or a numerical IP address such as \fB127.0.0.1\fR. Use \fIlocalhost\fR to refer to the host on which the command is invoked. .PP @@ -84,7 +84,9 @@ returns immediately and \fBfblocked\fR on the socket returns 1. If the \fB\-server\fR option is specified then the new socket will be a server for the port given by \fIport\fR (either an integer or a service name, where supported and understood by the host -operating system). +operating system; if \fIport\fR is zero, the operating system will +allocate a free port to the server socket which may be discovered by +using \fBfconfigure\fR to read the \fB\-sockname\fR option). Tcl will automatically accept connections to the given port. For each connection Tcl will create a new channel that may be used to communicate with the client. Tcl then invokes \fIcommand\fR @@ -144,6 +146,30 @@ or bound. If the host name cannot be computed, the second element of the list is identical to the address, its first element. .PP +.SH "EXAMPLES" +Here is a very simple time server: + +.CS +proc Server {channel clientaddr clientport} { + puts "Connection from $clientaddr registered" + puts $channel [clock format [clock seconds]] + close $channel +} + +socket -server Server 9900 +vwait forever +.CE + +And here is the corresponding client to talk to the server: + +.CS +set server localhost +set sockChan [socket $server 9900] +gets $sockChan line +close $sockChan +puts "The time on $server is $line" +.CE + .SH "SEE ALSO" fconfigure(n), flush(n), open(n), read(n) |