EvmConnFlush man page on DigitalUNIX

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EvmConnWait(3)							EvmConnWait(3)

       EvmConnCheck,  EvmConnWait,  EvmConnDispatch,  EvmConnFlush - Maintains
       connection with the EVM daemon

       #include <sys/time.h> #include <evm/evm.h>

       EvmStatus_t EvmConnCheck (
	       EvmConnection_t connection,
	       EvmBoolean_t *IOWaiting ); EvmStatus_t EvmConnWait (
	       EvmConnection_t connection,
	       const struct timeval *timeout ); EvmStatus_t EvmConnDispatch (
	       EvmConnection_t connection ); EvmStatus_t EvmConnFlush (
	       EvmConnection_t connection,
	       EvmInt32_t *count );

       The EVM connection that is to be monitored.  This is the	 return	 oper‐
       and.  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 should call EvmConnDispatch() to
       handle the outstanding activity.	 If this value is NULL,	 it  specifies
       that  EvmConnWait()  should wait until there is activity on the connec‐
       tion. If this value is not NULL, it specifies the amount of  time  that
       EvmConnWait()  should  wait for activity on the connection.  Receives a
       count of messages queued for sending to the EVM daemon.

       The EvmConnCheck() routine checks whether there	is  any	 I/O  activity
       outstanding  on	the  connection.   If  there  is,  IOWaiting is set to
       EvmTRUE. The program should then call EvmConnDispatch() to  handle  it.
       If  there is no outstanding I/O activity, IOWaiting is set to EvmFALSE.
       A response EvmTRUE from this function does not guarantee that an	 event
       has  arrived;  simply  that  there  is a message on the connection that
       needs to be handled.

       The EvmConnWait() routine blocks until activity is detected on the con‐
       nection.	 If  timeout is not NULL, it specifies the amount of time that
       the function should wait for activity on the connection before  return‐
       ing with a status of EvmERROR_TIMEOUT.

       The  EvmConnDispatch()  routine will handle 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 immedi‐
       ately. Calling this function is not guaranteed to  invoke  the  connec‐
       tion's  callback	 function,  and	 if the callback is invoked, it is not
       necessarily true that an event has arrived.

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

       The operation was completed without error.  One of the arguments to the
       function was 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  EvmConnDestroy()  to
       destroy	the connection.	 A timeout period expired.  The current opera‐
       tion was interrupted by receipt of a signal.  One or more  messages  is
       queued for sending to the EVM daemon.


       EVM Support Library (libevm.so, libevm.a)

       Default pathname for the domain socket.

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

       Routines:    EvmConnControl(3),	 EvmConnCreate(3),   EvmConnDestroy(3)

       Files: kevm(7)

       Event Management: EVM(5)

       Event Callback: EvmCallback(5)

       Event Connection: EvmConnection(5)

       EVM Events: EvmEvent(5)


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