Add the run_with_crashpad tool

tools/mac/run_with_crashpad.ad

Index: tools/mac/run_with_crashpad.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
+
+= run_with_crashpad(1)
+
+== Name
+
+run_with_crashpad - Run a program with a Crashpad exception handler
+
+== Synopsis
+
+[verse]
+*run_with_crashpad* ['OPTION…'] 'COMMAND' ['ARG…']
+
+== Description
+
+Starts a Crashpad exception handler server such as crashpad_handler(8) and
+becomes its client, setting an exception port referencing the handler. Then,
+executes 'COMMAND' along with any arguments specified ('ARG…') with the new
+exception port in effect.
+
+The exception port is configured to receive exceptions of type +EXC_CRASH+,
++EXC_RESOURCE+, and +EXC_GUARD+. The exception behavior is configured as
++EXCEPTION_STATE_IDENTITY | MACH_EXCEPTION_CODES+. The thread state flavor is
+set to +MACHINE_THREAD_STATE+.
+
+Programs that use the Crashpad client library directly will not normally use
+this tool. This tool exists to allow programs that are unaware of Crashpad to be
+run with a Crashpad exception handler.
+
+== Options
+*-h*, *--handler*='HANDLER'::
+Invoke 'HANDLER' as the Crashpad handler program instead of the default,
+*crashpad_handler*.
+
+*-a*, *--handler-argument*='ARGUMENT'::
+Invokes the Crashpad handler program with 'ARGUMENT' as one of its arguments.
+This option may appear zero, one, or more times. Regardless of this option’s
+presence, the handler will always be invoked with the necessary arguments to
+perform a handshake.
+
+*--help*::
+Display help and exit.
+
+*--version*::
+Output version information and exit.
+
+== Examples
+
+Starts a Crashpad exception handler server by its default name,
+*crashpad_handler*, and runs a program with this handler in effect.
+[subs="quotes"]
+----
+$ *run_with_crashpad crash*
+Illegal instruction: 4
+----
+
+Starts a Crashpad exception handler server at a nonstandard path, and runs
+exception_port_tool(1) to show the task-level exception ports.
+[subs="quotes"]
+----
+$ *run_with_crashpad --handler=/tmp/crashpad_handler exception_port_tool*
+task exception port 0, mask 0x1c00 (CRASH|RESOURCE|GUARD), port 0x30b, behavior
+0x80000003 (STATE_IDENTITY|MACH), flavor 7 (THREAD)
+----
+
+== Exit Status
+
+*0*::
+Success.
+
+*125*::
+Failure, with a message printed to the standard error stream.
+
+*126*::
+The program specified by 'COMMAND' was found, but could not be invoked.
+
+*127*::
+The program specified by 'COMMAND' could not be found.
+
+== See Also
+
+crashpad_handler(8),
+exception_port_tool(1)
+
+include::../man_footer.ad[]