EvmConnCheck(3) 					     Library Functions Manual						   EvmConnCheck(3)

NAME

       EvmConnCheck(), EvmConnWait(), EvmConnDispatch(), EvmConnFlush() - maintain connection with the EVM daemon

SYNOPSIS

   Library
       EVM Support Library

   Parameters
       connection  The EVM connection that is to be monitored.	See the EvmConnCreate(3) manpage.

       IOWaiting   This is the return operand.	Possible values for this operand are the following:

		   There is no outstanding I/O activity on the connection.

		   There is outstanding I/O activity on the connection.
			       The client needs to call to handle the outstanding activity.

       timeout	 If  the  timeout  value is NULL, it specifies that is to wait until there is activity on the connection.  If the timeout value is
		 not NULL, it specifies the amount of time that waits for activity on the connection.

       count	 Receives a count of messages queued for sending to the EVM daemon.

DESCRIPTION

       The routine checks whether there is any I/O activity outstanding on the connection.  If there is activity, IOWaiting is set to The  program
       is to then call to handle it.  If there is no outstanding I/O activity, IOWaiting is set to An response from this function does not guaran-
       tee that an event has arrived.  An response simply means that there is a message on the connection that needs to be handled.

       The routine blocks until activity is detected on the connection.  If timeout is not NULL, it specifies the amount of time that the function
       waits for activity on the connection before returning with a status of

       The  routine  handles one incoming I/O message on the connection, calling the client's callback function as needed.  If there is no message
       awaiting processing, the function returns immediately.  Calling this function is not guaranteed to invoke the connection's  callback  func-
       tion.  If the callback is invoked, it is not necessarily true that an event has arrived.

       The routine attempts to send to the EVM daemon any messages that are queued for output as a result of earlier calls on a connection that is
       marked as a non-blocking connection.  The routine continues to send messages from the queue, until either all messages have  been  sent	or
       until  the  send buffer is full.  On return, if the count output parameter is a number greater than zero, then that number is the number of
       messages still queued for sending.  returns See EvmConnControl(3) for more information.

RETURN VALUE

       The operation completed without error.

       One of the arguments to the function is invalid.

       A value in a structure member is invalid.

       An operation failed because an attempt to acquire heap memory failed.

       A read error occurred while reading from the EVM daemon connection.

       A write error occurred while writing to the EVM daemon connection.

       An error occurred on the EVM connection. Invoke
				  to destroy the connection.

       A timeout period expired.

       The current operation was interrupted by receipt of a signal.

       One or more messages is queued for sending to the EVM daemon.

ERRORS

       The value of is not set.

FILES

       Default pathname for the domain socket.

SEE ALSO

   Functions
       connect(2), select(2), socket(2).

   Routines
       EvmConnControl(3), EvmConnCreate(3), EvmConnDestroy(3), EvmEventPost(3).

   Event Management
       EVM(5).

   Event Callback
       EvmCallback(5).

   Event Connection
       EvmConnection(5).

   EVM Events
       EvmEvent(5).

																   EvmConnCheck(3)