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leaks: add unix signals documentation
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4973>
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@ -27,10 +27,16 @@
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* objects and prints a list of leaks to the debug log under `GST_TRACER:7` when
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* gst_deinit() is called, and also prints a g_warning().
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*
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* Starting with GStreamer 1.18, you can also use action signals on the tracer
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* Starting with GStreamer 1.18, you can also use GObject action signals on the tracer
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* object to fetch leak information. Use gst_tracing_get_active_tracers() to
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* get a list of all active tracers and find the right one by name.
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*
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* If the `GST_LEAKS_TRACER_SIG` env variable is defined, you can use the
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* following POSIX signals to interact with the leaks tracer:
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* - SIGUSR1: log alive objects
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* - SIGUSR2: create a checkpoint and print a list of objects created and
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* destroyed since the previous checkpoint.
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*
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* You can activate this tracer in the usual way by adding the string 'leaks'
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* to the environment variable `GST_TRACERS`. Such as: `GST_TRACERS=leaks`
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*
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