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tools/catch_exception_tool.ad

+// 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
+
+= catch_exception_tool(1)
+
+== Name
+
+catch_exception_tool - Catch Mach exceptions and display information about them
+
+== Synopsis
+
+[verse]
+*catch_exception_tool* *-m* 'SERVICE' ['OPTION…']
+
+== Description
+
+Runs a Mach exception server registered with the bootstrap server under the name
+'SERVICE'. The exception server is capable of receiving exceptions for
+“behavior” values of +EXCEPTION_DEFAULT+, +EXCEPTION_STATE+, and
++EXCEPTION_STATE_IDENTITY+, with or without +MACH_EXCEPTION_CODES+ set.
+
+== Options
+
+*-f*, *--file*='FILE'::
+Information about the exception will be appended to 'FILE' instead of the
+standard output stream.
+
+*-m*, *--mach_service*='SERVICE'::
+Check in with the bootstrap server under the name 'SERVICE'. This service name
+may already be reserved with the bootstrap server in cases where this tool is
+started by launchd(8) as a result of a message being sent to a service declared
+in a job’s +MachServices+ dictionary (see launchd.plist(5)). The service name
+may also be completely unknown to the system.
+
+*-n*, *--nonblocking*::
+Don’t wait for an exception to occur if one is not received immediately. In
+nonblocking mode, this tool exits immediately if no exception is received. The
+default mode is blocking.
+
+*-p*, *--persistent*::
+Continue processing exceptions after the first one. The default mode is
+one-shot, where this tool exits after processing the first exception.
+
+*-t*, *--timeout*='TIMEOUT'::
+Run for a maximum of 'TIMEOUT' seconds. This option only has an effect in
+blocking mode (when *--nonblocking* is not specified). In *--persistent* mode,
+'TIMEOUT' applies to the overall duration that this tool will run, not to the
+processing of individual exceptions.
+
+*--help*::
+Display help and exit.
+
+*--version*::
+Output version information and exit.
+
+== Examples
+
+Run a one-shot blocking exception server registered with the bootstrap server
+under the name +svc+:
+[subs="quotes"]
+----
+$ *catch_exception_tool --mach_service=svc --file=out &*
+[1] 1233
+$ *exception_port_tool --set_handler=handler=bootstrap:svc crasher*
+Illegal instruction: 4
+[1]+  Done    catch_exception_tool --mach_service=svc --file=out
+$ *cat out*
+catch_exception_tool:
+behavior EXCEPTION_DEFAULT|MACH_EXCEPTION_CODES,
+pid 1234, thread 56789, exception EXC_CRASH, codes[2] 0x4200001, 0,
+original exception EXC_BAD_INSTRUCTION, original code[0] 1,
+signal SIGILL
+----
+
+Run an on-demand exception server started by launchd(5) available via the
+bootstrap server under the name +svc+:
+[subs="quotes"]
+----
+$ *on_demand_service_tool --load --label=catch_exception \
+      --mach_service=svc \
+      $(which catch_exception_tool) --mach_service=svc \
+      --file=/tmp/out --nonblocking --persistent*
+$ *exception_port_tool --set_handler=handler=bootstrap:svc crasher*
+Illegal instruction: 4
+$ *on_demand_service_tool --unload --label=catch_exception*
+$ *cat /tmp/out*
+catch_exception_tool:
+behavior EXCEPTION_DEFAULT|MACH_EXCEPTION_CODES,
+pid 2468, thread 13579, exception EXC_CRASH, codes[2] 0x4200001, 0,
+original exception EXC_BAD_INSTRUCTION, original code[0] 1,
+signal SIGILL
+----
+
+== Exit Status
+
+*0*::
+Success. In *--persistent* mode with a *--timeout* set, it is considered
+successful if at least one exception was caught when the timer expires.
+
+*1*::
+Failure, with a message printed to the standard error stream.
+
+== See Also
+
+exception_port_tool(1),
+on_demand_service_tool(1)
+
+include::man_footer.ad[]