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Using the VPO Application Programming Interfaces
The VPO Interfaces
Chapter 4174
The routines return an error/ok code, with errors being logged in the file:
/var/opt/OV/log/OpC/mgmt_sv/opcerror
Access to the Server Message-stream Interface
If an application registers at the Message Stream Interface, VPO checks
the setting of the Enable Message Stream Interface checkbox in the
Server Configuration window. If the interface is enabled, the message
manager passes the message down to the next check. If the message
itself is also allowed for output, it is written to the interface queues of
OPCSVIF_EXTMSGPROC_READ and OPCSVIF_EXTMSGPROC_
READWRITE. If the option button Copy Message is selected, a copy of
the message is immediately passed back to the internal flow of the
management server, see Figure 4-7 on page 186.
To allow the encapsulation of the opcif_write() routine in a command
that can be used in shell scripts, it is possible to open the write queue of
the read/write interface in a separate process using another interface
type.