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third_party/crashpad/crashpad/tools/generate_dump.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.
+-->
+
+# generate_dump(1)
+
+## Name
+
+generate_dump—Generate a minidump file containing a snapshot of a running
+process
+
+## Synopsis
+
+**generate_dump** [_OPTION…_] _PID_
+
+## Description
+
+Generates a minidump file containing a snapshot of a running process whose
+process identifier is _PID_. By default, the target process will be suspended
+while the minidump is generated, and the minidump file will be written to
+`minidump.PID`. After the minidump file is generated, the target process resumes
+running.
+
+The minidump file will contain information about the process, its threads, its
+modules, and the system. It will not contain any exception information because
+it will be generated from a live running process, not as a result of an
+exception occurring.
+
+On macOS, this program uses `task_for_pid()` to access the process’ task port.
+This operation may be restricted to use by the superuser, executables signed by
+an authority trusted by the system, and processes otherwise permitted by
+taskgated(8). Consequently, this program must normally either be signed or be
+invoked by root. It is possible to install this program as a setuid root
+executable to overcome this limitation, although it will remain impossible to
+generate dumps for processes protected by [System Integrity Protection
+(SIP)](https://support.apple.com/HT204899), including those whose “restrict”
+codesign(1) option is respected.
+
+This program is similar to the gcore(1) program available on some operating
+systems.
+
+## Options
+
+ * **-r**, **--no-suspend**
+
+   The target process will continue running while the minidump file is
+   generated. Normally, the target process is suspended during this operation,
+   which guarantees that the minidump file will contain an atomic snapshot of
+   the process.
+
+   This option may be useful when attempting to generate a minidump from a
+   process that dump generation has an interprocess dependency on, such as a
+   system server like launchd(8) or opendirectoryd(8) on macOS. Deadlock could
+   occur if any portion of the dump generation operation blocks while waiting
+   for a response from one of these servers while they are suspended.
+
+ * **-o**, **--output**=_FILE_
+
+   The minidump will be written to _FILE_ instead of `minidump.PID`.
+
+ * **--help**
+
+   Display help and exit.
+
+ * **--version**
+
+   Output version information and exit.
+
+## Examples
+
+Generate a minidump file in `/tmp/minidump` containing a snapshot of the process
+with PID 1234.
+
+```
+$ generate_dump --output=/tmp/minidump 1234
+```
+
+## Exit Status
+
+ * **0**
+
+   Success.
+
+ * **1**
+
+   Failure, with a message printed to the standard error stream.
+
+## See Also
+
+[catch_exception_tool(1)](mac/catch_exception_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.