6.2. Adding Advanced Features

When designing an application, you must test for Digital Network Interface alarm, signaling, and other unsolicited or asynchronous events by constructing one or more event handlers. An event handler is an application-defined function that is called by the Standard Runtime Library (SRL).

NOTE:

Event handling operations vary with the mode type (i.e., callback, polled, synchronous, etc.) used by your application. For more information on application development models, refer to the Standard Runtime Library Programmer's Guide (for Linux or Windows - part of the Voice Software Reference for Linux or Windows).

Warning

To avoid re-entrance problems, construction of an event handler must follow the same rules as a signal handler. Consult your system administrator or documentation for detailed information.

Calls to the appropriate event handler are managed by SRL. Within a Digital Network Interface application, event notification may be enabled, disabled, held, and released by a combination of SRL and Digital Network Interface library functions. For more information, refer to Appendix A - Standard Runtime Library.

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