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-.\" This is -*-nroff-*-
-.\" XXX standard disclaimer belongs here....
-.\" $Header: /cvsroot/pgsql/doc/man/Attic/listen.l,v 1.1.1.1 1996/08/18 22:14:25 scrappy Exp $
-.TH "LISTEN" SQL 03/12/94 Postgres95 Postgres95
-.SH NAME
-listen \(em listen for notification on a relation
-.SH SYNOPSIS
-.nf
-\fBlisten\fR class_name
-.fi
-.SH DESCRIPTION
-.BR listen
-is used to register the current backend as a listener on the relation
-.IR class_name .
-When the command 
-.BI notify " class_name"
-is called either from within a rule or at the query level, the
-frontend applications corresponding to the listening backends 
-are notified.  When the backend process exits, this registration
-is cleared.
-.PP
-This event notification is performed through the Libpq protocol
-and frontend application interface.  The application program 
-must explicitly poll a Libpq global variable, 
-.IR PQAsyncNotifyWaiting ,
-and call the routine
-.IR PQnotifies
-in order to find out the name of the class to which a given 
-notification corresponds.  If this code is not included in 
-the application, the event notification will be queued and 
-never be processed.
-.SH "SEE ALSO"
-create rule(l),
-notify(l),
-select(l),
-libpq.
-.SH BUGS
-There is no way to un-\c
-.BR listen
-except to drop the connection (i.e., restart the backend server).
-.PP
-The
-.IR monitor (1)
-command does not poll for asynchronous events.