07-01-2008
Indeed, it's possible.
Socket is alive until it's closed.
It's not a communication channel, but kernel api.
It's application's responsibility to close sockets properly.
If one side got disconnected another side expect to have 0 length of read data or failure to send error.
Multicast is another story.
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LEARN ABOUT CENTOS
tcl_createclosehandler
Tcl_CreateCloseHandler(3) Tcl Library Procedures Tcl_CreateCloseHandler(3)
__________________________________________________________________________________________________________________________________________________
NAME
Tcl_CreateCloseHandler, Tcl_DeleteCloseHandler - arrange for callbacks when channels are closed
SYNOPSIS
#include <tcl.h>
void
Tcl_CreateCloseHandler(channel, proc, clientData)
void
Tcl_DeleteCloseHandler(channel, proc, clientData)
ARGUMENTS
Tcl_Channel channel (in) The channel for which to create or delete a close callback.
Tcl_CloseProc *proc (in) The procedure to call as the callback.
ClientData clientData (in) Arbitrary one-word value to pass to proc.
_________________________________________________________________
DESCRIPTION
Tcl_CreateCloseHandler arranges for proc to be called when channel is closed with Tcl_Close or Tcl_UnregisterChannel, or using the Tcl
close command. Proc should match the following prototype:
typedef void Tcl_CloseProc(
ClientData clientData);
The clientData is the same as the value provided in the call to Tcl_CreateCloseHandler.
Tcl_DeleteCloseHandler removes a close callback for channel. The proc and clientData identify which close callback to remove; Tcl_Delete-
CloseHandler does nothing if its proc and clientData arguments do not match the proc and clientData for a close handler for channel.
SEE ALSO
close(n), Tcl_Close(3), Tcl_UnregisterChannel(3)
KEYWORDS
callback, channel closing
Tcl 7.5 Tcl_CreateCloseHandler(3)