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VSTa manual pages  - MSG_PORTNAME (2)

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msg_portname - get name associated with port

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Synopsis
Description

#include <sys/msg.h>
port_name msg_port(port_t p);

The msg_portname() system service returns the port_name associated with an open port, suitable for use in a later call to msg_connect(). It is most often used to find out if two open files reside on the same "filesystem", that is, under the same server.