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third_party/crashpad/crashpad/tools/mac/catch_exception_tool.md

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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.
+-->
+
+# catch_exception_tool(1)
+
+## Name
+
+catch_exception_tool—Catch Mach exceptions and display information about them
+
+## Synopsis
+
+**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.
+
+ * **-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. Specify `0` to request non-blocking
+   operation, in which the tool exits immediately if no exception is received.
+   In **--persistent** mode, _TIMEOUT_ applies to the overall duration that this
+   tool will run, not to the processing of individual exceptions. When
+   **--timeout** is not specified, this tool will block indefinitely while
+   waiting for an exception.
+
+ * **--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`:
+
+```
+$ 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`:
+
+```
+$ `on_demand_service_tool --load --label=catch_exception \
+      --mach-service=svc \
+      $(which catch_exception_tool) --mach-service=svc \
+      --file=/tmp/out --persistent --timeout=0
+$ 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)](exception_port_tool.md),
+[on_demand_service_tool(1)](on_demand_service_tool.md)
+
+## Resources
+
+Crashpad home page: https://crashpad.chromium.org/.
+
+Report bugs at https://crashpad.chromium.org/bug/new.
+
+## Copyright
+
+Copyright 2014 [The Crashpad
+Authors](https://chromium.googlesource.com/crashpad/crashpad/+/master/AUTHORS).
+
+## License
+
+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.