on_demand_service_tool—Load and unload on-demand Mach services registered with launchd(8)
on_demand_service_tool -L -l LABEL [OPTION…] COMMAND [ARG…]
on_demand_service_tool -U -l LABEL
On-demand services may be registered with launchd(8) by using the --load form. One or more service names may be registered with the bootstrap server by specifying --mach-service. When a Mach message is sent to any of these services, launchd(8) will invoke COMMAND along with any arguments specified (ARG…). COMMAND must be an absolute pathname.
The --unload form unregisters jobs registered with launchd(8).
-L, --load
Registers a job with launchd(8). --label=LABEL and COMMAND are required. This operation may also be referred to as “load” or “submit”.
-U, --unload
Unregisters a job with launchd(8). --label=LABEL is required. This operation may also be referred to as “unload” or “remove”.
-l, --label=LABEL
LABEL is used as the job label to identify the job to launchd(8). LABEL must be unique within a launchd(8) context.
-m, --mach-service=SERVICE
In conjunction with --load, registers SERVICE with the bootstrap server. Clients will be able to obtain a send right by looking up the SERVICE name with the bootstrap server. When a message is sent to such a Mach port, launchd(8) will invoke COMMAND along with any arguments specified (ARG…) if it is not running. This forms the “on-demand” nature referenced by this tool’s name. This option may appear zero, one, or more times. SERVICE must be unique within a bootstrap context.
--help
Display help and exit.
--version
Output version information and exit.
Registers an on-demand server that will execute catch_exception_tool(1) when a Mach message is sent to a Mach port obtained from the bootstrap server by looking up the name svc:
$ on_demand_service_tool --load --label=catch_exception \
--mach-service=svc \
$(which catch_exception_tool) --mach-service=svc \
--file=/tmp/out --persistent --timeout=0
Unregisters the on-demand server installed above:
$ on_demand_service_tool --unload --label=catch_exception
0
Success.
1
Failure, with a message printed to the standard error stream.
catch_exception_tool(1), exception_port_tool(1), launchctl(1)
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Licensed under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
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