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man pages section 8: System Administration Commands

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Updated: Thursday, June 13, 2019
 
 

syseventadm(8)

Name

syseventadm - sysevent event specification administration

Synopsis

syseventadm add [-R rootdir] [-v vendor] [-p publisher] 
     [-c class] [-s subclass] [-u username] path [args]
syseventadm remove [-R rootdir] [-v vendor] [-p publisher] 
     [-c class] [-s subclass] [-u username] [path [args]]
syseventadm list [-R rootdir] [-v vendor] [-p publisher] 
     [-c class] [-s subclass] [-u username] [path [args]]
syseventadm restart

Description

The syseventadm command is an administrative front-end to add, remove and list sysevent event handlers. You can also restart the sysevent daemon by use of the restart command. syseventadm can only be run by root.

The syseventadm add command adds a handler for a sysevent event specified by at least one of vendor, publisher or class. If class is specified, it may be qualified with a sub-class. Only the values specified for vendor, publisher, class and sub-class when adding the handler are matched against sysevent events to determine if the specification matches the event and the handler should be run. path is the full pathname of the command to be run in response to matching events, with optional arguments (args). If username is specified, the command is invoked as user username, otherwise as root.

The syseventadm remove command removes handlers for matching sysevent event specifications. Event specifications may be matched by specifying at least one of vendor, publisher, class, username or path. If class is specified, it may be qualified with a sub-class. Any of vendor, publisher, class, sub-class, username, path or args not specified match the corresponding fields of all events. Handlers for all matching specifications are removed.

The syseventadm list command lists the handlers for matching sysevent event specifications using the same match criteria as the remove command but without the requirement that at least one of vendor, publisher, class, username or path be specified. With no match criteria, all specifications are listed. The list command output format is: [vendor=vendor] [publisher= publisher] [class=class] [subclass=subclass] [username=username] path [args] where each of class, sub-class, vendor, publisher and username is listed only if part of the match criteria for the listed specification is present.

The syseventadm restart command informs the syseventd daemon to reread the sysevent registry after a change has been made by adding or removing one or more sysevent handler specifications.

Argument Macro Substitution

The sysevent handling facility provides extensive macro capability for constructing the command line arguments to be executed in response to an event. Macro expansion applies only to the command line args specified for an event handler, with macros expanded with data from the event itself. Pre-defined macros are provided for the event class, subclass, publisher and vendor information. Macros not matching one of the pre-defined macro names cause the attribute list attached to the event to be searched for an attribute of that name, with the value of the matching attribute substituted on the command line.

Macros are introduced by the $ character, with the macro name being the following token separated by a SPACE or TAB character. If the macro name is embedded in text, it may be delineated by ${ and }. A \ before the $ causes macro expansion not to occur.

$class

The class string defining the event

$publisher

The publisher string defining the event

$sequence

The sequence number of the event.

$subclass

The subclass string defining the event

$timestamp

The timestamp of the event.

$vendor

The vendor string defining the event

Macro names other than those pre-defined are compared against the attribute list provided with the event. An attribute with name matching the macro name causes the value of the attribute to be substituted as ASCII text on the generated command line.

Use of a macro for which no attribute with that name is defined, or for which multiple attributes with that name are provided, cause an error and the command is not invoked.

Attributes with signed data types (DATA_TYPE_INT16, DATA_TYPE_INT32 and DATA_TYPE_INT64) are expanded as decimal digits.

Attributes with unsigned data types (DATA_TYPE_BYTE, DATA_TYPE_UINT16, DATA_TYPE_UINT32, DATA_TYPE_UINT64 and DATA_TYPE_HTTIME) are expanded as hexadecimal digits with a 0x prefix.

Attributes with string data type (DATA_TYPE_STRING) are expanded with the string data. The data is not quoted. If if it desired that the quoted strings be generated on the command line, put quotes around the macro call in the arguments.

Array types are expanded with each element expanded as defined for that scalar type, with a space separating each element substitution.

Options

The add, list and remove subcommands support the following options:

–c class

Specify the event class, class.

–p publisher

Specify the event publisher, publisher.

–R rootdir

Specify an alternate root path, rootdir.


Note - The root file system of any non-global zones must not be referenced with the –R option. Doing so might damage the global zone's file system, might compromise the security of the global zone, and might damage the non-global zone's file system. See zones(7).
–s subclass

Specify the event subclass, subclass.

–u username

Specify the username (username) to invoke the command.

–v vendor

Specify the vendor (vendor) that defines the event. Events defined by third-party software should specify the company's stock symbol as vendor. Oracle-defined events use SUNW.

Operands

The add, list and remove subcommands support the following options:

args

Command arguments

path

Full path of command to be run in response to event

Examples

Example 1 Adding an Event Handler

The following example adds an event handler for an event defined by vendor MYCO (“My Company”), class EC_ENV and sub-class ESC_ENV_TEMP. The command to be run is /opt/MYCOenv/bin/ec_env_temp, with arguments being the class name, sub-class name and pathname derived from the event attributes. The $ characters are preceded by a backslash to circumvent shell interpretation. There is no need to restart the service after the change since the registry is maintained on $ALTROOT.


# syseventadm add -R \ALTROOT -v MYCO -c EC_ENV -s ESC_ENV_TEMP \
     /opt/MYCOenv/bin/ec_env_temp \$class \$subclass \$pathname

Note the caveat on the use of the –R option in the description of that option, above.

Example 2 Removing an Event Handler

The following example removes the event handler added in Example 1.


# syseventadm remove -R \ALTROOT -v MYCO -c EC_ENV -s ESC_ENV_TEMP \
     /opt/MYCOenv/bin/ec_env_temp \class} \subclass} \pathname}

Note the caveat on the use of the –R option in the description of that option, above.

Example 3 Listing Event Handlers

The following example lists all event handlers for events of class EC_ENV, subclass ESC_ENV_TEMP, as defined by vendor MYCO:


# syseventadm list -v MYCO -c EC_ENV -s ESC_ENV_TEMP \
     vendor=MYCO class=EC_ENV subclass=ESC_ENV_TEMP \
     /opt/MYCOenv/bin/ec_env_temp \${class} \${subclass} \${pathname}

Example 4 Listing Event Handlers

The following example lists all event handlers defined by vendor VRTS.


# syseventadm list -v VRTS

Example 5 Removing Event Handlers

The following example removes all event handlers defined by vendor VRTS, and restarts service.


# syseventadm remove -v VRTS
# syseventadm restart

Example 6 Listing All Event Handlers Specified to Run a Command

The following example lists all event handlers specified to run the command /opt/MYCOenv/bin/ec_env_temp:


# syseventadm list /opt/MYCOenv/bin/ec_env_temp

Example 7 Removing Event Handlers and Restarting Service

The following example removes all event handlers specified to run the command /opt/MYCOenv/bin/ec_env_temp, and restarts service:


# syseventadm remove /opt/MYCOenv/bin/ec_env_temp
# syseventadm restart

Exit Status

The following exit values are returned:

0

Successful completion.

1

No matching event specification found (remove or list commands only).

2

Incorrect command usage.

3

Permission denied.

4

Command failed.

5

Out of memory.

Attributes

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE
ATTRIBUTE VALUE
Availability
system/system-events

See Also

sysevent_post_event(3SYSEVENT), attributes(7), syseventd(8), ddi_log_sysevent(9F)

Notes

To avoid upgrade problems, packages delivering a sysevent event handler should install the event handler by running syseventadm from the package's postinstall script. The event handler can then be removed by running syseventadm from the package's preremove script using the same arguments as when added.