Overall SAF Administration (sacadm)
The sacadm command is the top level of the SAF. The sacadm command
primarily is used to add and remove port monitors such as ttymon and
listen. Other sacadm functions include listing the current status of port monitors and
administering port monitor configuration scripts.
Service Access Controller (SAC Program)
The Service Access Controller program (SAC) oversees all port monitors. A system automatically
starts the SAC upon entering multiuser mode.
When the SAC program is invoked, it first looks for, and interprets, each
system's configuration script. You can use the configuration script to customize the SAC
program environment. This script is empty by default. The modifications made to the
SAC environment are inherited by all the “children” of the SAC. This inherited
environment might be modified by the children.
After the SAC program has interpreted the per-system configuration script, the SAC program
reads its administrative file and starts the specified port monitors. For each port
monitor, the SAC program runs a copy of itself, forking a child process.
Each child process then interprets its per-port monitor configuration script, if such a
script exists.
Any modifications to the environment specified in the per-port monitor configuration script affect
the port monitor and will be inherited by all its children. Finally, the
child process runs the port monitor program by using the command found in
the SAC program administrative file.
SAC Initialization Process
The following steps summarize what happens when SAC is first started:
The SAC program is started by the SMF service, svc:/system/sac:default.
The SAC program reads /etc/saf/_sysconfig, the per-system configuration script.
The SAC program reads /etc/saf/_sactab, the SAC administrative file.
The SAC program forks a child process for each port monitor it starts.
Each port monitor reads /etc/saf/pmtag/_config, the per-port monitor configuration script.
