Add tool man pages in asciidoc format

tools/on_demand_service_tool.ad

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+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// 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
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+:doctype: manpage
+
+= on_demand_service_tool(1)
+
+== Name
+
+on_demand_service_tool - Load and unload on-demand Mach services registered with
+launchd(8)
+
+== Synopsis
+
+[verse]
+*on_demand_service_tool* *-L* *-l* 'LABEL' ['OPTION…'] 'COMMAND' ['ARG…']
+*on_demand_service_tool* *-U* *-l* 'LABEL'
+
+== Description
+
+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).
+
+== Options
+
+*-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.
+
+== Examples
+
+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+:
+[subs="quotes"]
+----
+$ *on_demand_service_tool --load --label=catch_exception \
+      --mach_service=svc \
+      $(which catch_exception_tool) --mach_service=svc \
+      --file=/tmp/out --nonblocking --persistent*
+----
+
+Unregisters the on-demand server installed above:
+[subs="quotes"]
+----
+$ *on_demand_service_tool --unload --label=catch_exception*
+----
+
+== Exit Status
+
+*0*::
+Success.
+
+*1*::
+Failure, with a message printed to the standard error stream.
+
+== See Also
+
+exception_port_tool(1),
+launchctl(1)
+on_demand_service_tool(1)
+
+include::man_footer.ad[]