UTRACE_SET_EVENTS - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : utrace core API

NAMEutrace_set_events − choose which event reports a tracing engine gets

SYNOPSISint utrace_set_events(struct task_struct * target, struct utrace_engine * engine, unsigned long events);

ARGUMENTStarget thread to affect engine attached engine to affect events new event mask

DESCRIPTIONThis changes the set of events for which engine wants callbacks made​. This fails with −EALREADY and does nothing if you try to clear UTRACE_EVENT(DEATH) when the report_death callback may already have begun, if you try to clear UTRACE_EVENT(REAP) when the report_reap callback may already have begun, or if you try to newly set UTRACE_EVENT(DEATH) or UTRACE_EVENT(QUIESCE) when target is already dead or dying​. This can fail with −ESRCH when target has already been detached, including forcible detach on reaping​. If target was stopped before the call, then after a successful call, no event callbacks not requested in events will be made; if UTRACE_EVENT(QUIESCE) is included in events, then a report_quiesce callback will be made when target resumes​. If target was not stopped and events excludes some bits that were set before, this can return −EINPROGRESS to indicate that target may have been making some callback to engine​. When this returns zero, you can be sure that no event callbacks you´ve disabled in events can be made​. If events only sets new bits that were not set before on engine, then −EINPROGRESS will never be returned​. To synchronize after an −EINPROGRESS return, see utrace_barrier​. When target is current, −EINPROGRESS is not returned​. But note that a newly−created engine will not receive any callbacks related to an event notification already in progress​. This call enables events callbacks to be made as soon as engine becomes eligible for any callbacks, see utrace_attach_task​. These rules provide for coherent synchronization based on UTRACE_STOP, even when SIGKILL is breaking its normal simple rules​.
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