BUFINFO(3PVM)							  PVM Version 3.4						     BUFINFO(3PVM)

NAME

       pvm_bufinfo() - Returns information about a message buffer.

SYNOPSIS

       C    int info = pvm_bufinfo( int bufid, int *bytes, int *msgtag,
       int *tid )

       Fortran	 call pvmfbufinfo( bufid, bytes, msgtag, tid, info )

PARAMETERS

       bufid   Integer specifying a particular message buffer identifier.

       bytes   Integer	returning  the	length	in bytes of the body of the message.  This will be equal to the actual size of the data packed, if
	       PvmDataRaw is used, otherwise it may include pad bytes.

       msgtag  Integer returning the message label.  Useful when the message was received with a wildcard msgtag.

       tid     Integer returning the source of the message.  Useful when the message was received with a wildcard tid.

       info    Integer status code returned by the routine.  Values less than zero indicate an error.

DESCRIPTION

       The routine pvm_bufinfo returns information about the requested message buffer. Typically it is used to	determine  facts  about  the  last
       received message such as its size or source.  pvm_bufinfo is especially useful when an application is able to receive any incoming message,
       and the action taken depends on the source tid and the msgtag associated with the message that comes in first.  If pvm_bufinfo is  success-
       ful, info will be 0.  If some error occurs then info will be < 0.

EXAMPLES

       C:
	    bufid = pvm_recv( -1, -1 );
	    info = pvm_bufinfo( bufid, &bytes, &type, &source );

       Fortran:
	    CALL PVMFRECV( -1, -1, BUFID )
	    CALL PVMFBUFINFO( BUFID, BYTES, TYPE, SOURCE, INFO )

ERRORS

       This error condition can be returned by pvm_bufinfo.

       PvmNoSuchBuf
	      specified buffer does not exist.

       PvmBadParam
	      invalid argument

SEE ALSO

       pvm_recv(3PVM)

								  30 August, 1993						     BUFINFO(3PVM)