evmd - Event Manager daemon
The Event Manager (EVM) daemon, evmd, receives events from
posting clients and distributes them to subscribing
clients that have indicated that they are interested in
receiving the events. The daemon is a critical system
facility that is started automatically when the system
transitions to run level 2, and which should not be terminated.
The daemon in turn starts the event logger, evmlogger,
and the channel manager, evmchmgr.
On startup, the daemon reads its configuration file,
/etc/evmdaemon.conf, the authorization file,
/etc/evm.auth, and the event template files stored under
the /usr/share/evm/templates directory. If these files are
modified while the daemon is running, the evmreload -d
command must be used or a SIGHUP signal must be sent to
instruct the daemon to reconfigure itself.
The system administrator can control access to events by
modifying the EVM authorization file, /etc/evm.auth.
As a daemon, evmd does not have a standard output. Any
error messages are written to the file /var/evm/adm/logfiles/evmdaemon.log.
The EVM daemon is monitored by the Essential Services Monitor
daemon, esmd, which automatically restarts evmd if it
terminates unexpectedly. See esmd(8) for more information.
The daemon rejects any attempt by a posting client to post
an event that is not registered, that contains invalid
item values, or that the poster is not authorized to post.
The following exit values are returned: Successful completion.
An error occurred.
Executable file Default directory for event template
files. Default location for event filter files. Filter
files must have the suffix Error log file for evmd. UNIX
domain socket established for connection between the EVM
daemon and the local clients. Daemon process id saved by
evmd. Lock file established to prevent multiple invocations
of the daemon. Default location of the EVM daemon
configuration file. Default location of the EVM daemon
Commands: esmd(8), evmchmgr(8), evmd(8), evmlogger(8),
evmreload(8), evmstart(8), evmstop(8)
Files: evm.auth(4), evmdaemon.conf(4), evmtemplate(4)
Event Management: EVM(5)
Event Connection: EvmConnection(5)
EVM Events: EvmEvent(5)
Event Filter: EvmFilter(5)
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