TTY Monitor and Network Listener Port Monitors
Though the SAF provides a generic means for administering any future or third-party
port monitors, only two port monitors are implemented in the Solaris Operating
System: ttymon and listen.
TTY Port Monitor (ttymon)
The ttymon port monitor is STREAMS-based and does the following:
Sets terminal modes, baud rates, and line disciplines
Invokes the login process
The ttymon port monitor provides Solaris users the same services that the getty
port monitor did under previous versions of SunOS 4.1 software.
The ttymon port monitor runs under the SAC program and is configured with
the sacadm command. Each instance of ttymon can monitor multiple ports. These ports
are specified in the port monitor's administrative file. The administrative file is configured by
using the pmadm and ttyadm commands.
ttymon and the Console Port
Console services are not managed by the Service Access Controller (SAC), nor by
any explicit ttymon administration file. ttymon invocations are managed by SMF. As
a result, you can no longer invoke ttymon by adding an entry to
the /etc/inittab file. A property group with the type, application, and the name
ttymon, has been added to the SMF service, svc:/system/console-login:default. The properties within
this property group are used by the method script, /lib/svc/method/console-login. This script uses the
property values as arguments to the ttymon invocation. Usually, if the values are
empty, or if the values are not defined for any of the properties,
then the value is not used for ttymon. However, if the ttymon device
value is empty, or not set, then /dev/console is used as the default
to enable ttymon to run.
The following properties are available under the SMF service, svc:/system/console-login:default:
Specifies the nohangup property. If set to true, do not force a line hang up by setting the line speed to zero before setting the default or specified speed.
Specifies the prompt string for the console port.
Specifies the default terminal type for the console.
Specifies the console device.
Specifies the TTY label in the /etc/ttydefs line.
ttymon-Specific Administrative Command (ttyadm)
The ttymon administrative file is updated by the sacadm and pmadm commands,
as well as by the ttyadm command. The ttyadm command formats ttymon-specific
information and writes it to standard output, providing a means for presenting formatted
ttymon-specific data to the sacadm and pmadm commands.
Thus, the ttyadm command does not administer ttymon directly. The ttyadm command
complements the generic administrative commands, sacadm and pmadm. For more information, see the ttyadm(1M)
Network Listener Service (listen)
The listen port monitor runs under the SAC and does the following:
Monitors the network for service requests
Accepts requests when they arrive
Invokes servers in response to those service requests
The listen port monitor is configured by using the sacadm command. Each
instance of listen can provide multiple services. These services are specified in the
port monitor's administrative file. This administrative file is configured by using the pmadm
and nlsadmin commands.
The network listener process can be used with any connection-oriented transport provider that
conforms to the Transport Layer Interface (TLI) specification. In the Solaris Operating System,
listen port monitors can provide additional network services not provided by the inetd
Special listen-Specific Administrative Command (nlsadmin)
The listen port monitor's administrative file is updated by the sacadm and pmadm
commands, as well as by the nlsadmin command. The nlsadmin command formats listen-specific information
and writes it to standard output, providing a means of presenting formatted listen-specific data
to the sacadm and pmadm commands.
Thus, the nlsadmin command does not administer listen directly. The command complements
the generic administrative commands, sacadm and pmadm.
Each network, configured separately, can have at least one instance of the network
listener process associated with it. The nlsadmin command controls the operational states of
listen port monitors.
The nlsadmin command can establish a listen port monitor for a given network,
configure the specific attributes of that port monitor, and start and kill the monitor.
The nlsadmin command can also report on the listen port monitors on
For more information, see the nlsadmin(1M) man page.