PPP user-level processes

The Asynchronous Point-to-Point Protocol on this operating system utilizes three user-level processes.

1. A control daemon (pppcontrold) run by root under the System Resource Controller (startsrc -s pppcontrold). The control daemon's function encompasses loading and configuring all kernel extensions associated with the subsystem. It remains running as long as PPP function is required by the operating system.
2. An attachment process (pppattachd) that binds a TTY stream to an instance of the Link Control Protocol, Network Control Protocol, and a datagram protocol. An instance of pppattachd exists for each active PPP connection in the system. Any user of the attachment process must belong to the uucp group and contain /usr/sbin within their PATH environment variable.
3. A dialer process (pppdial) that establishes an outgoing connection. The dialer is intended to be executed by pppattachd as the connector program. Its purpose is to interact over the asynchronous device prior to PPP negotiation. This interaction is defined similarly to the UUCP chat dialog format. The dialer capability is provided to assist in establishing a connection with a remote system. The actual session establishment is out of the scope of PPP.