UTRACE_FINISH_EXAMIN(9) utrace core API UTRACE_FINISH_EXAMIN(9)NAME
utrace_finish_examine - complete an examination of thread state
SYNOPSIS
int utrace_finish_examine(struct task_struct * target, struct utrace_engine * engine, struct utrace_examiner * exam);
ARGUMENTS
target
thread of interest, a struct task_struct pointer
engine
engine pointer returned by utrace_attach_task
exam
pointer passed to utrace_prepare_examine call
DESCRIPTION
This call completes an examination on the thread target begun by a paired utrace_prepare_examine call with the same arguments that returned
success (zero).
When target is current, this call is superfluous. When target is another thread, this returns zero if target has remained unscheduled since
the paired utrace_prepare_examine call returned zero.
When this returns an error, any examination done since the paired utrace_prepare_examine call is unreliable and the data extracted should
be discarded. The error is -EINVAL if engine is not keeping target stopped, or -EAGAIN if target woke up unexpectedly.
Kernel Hackers Manual 2.6. July 2010 UTRACE_FINISH_EXAMIN(9)
Check Out this Related Man Page
UTRACE_ATTACH_TASK(9) utrace core API UTRACE_ATTACH_TASK(9)NAME
utrace_attach_task - attach new engine, or look up an attached engine
SYNOPSIS
struct utrace_engine * utrace_attach_task(struct task_struct * target, int flags, const struct utrace_engine_ops * ops, void * data);
ARGUMENTS
target
thread to attach to
flags
flag bits combined with OR, see below
ops
callback table for new engine
data
engine private data pointer
DESCRIPTION
The caller must ensure that the target thread does not get freed, i.e. hold a ref or be its parent. It is always safe to call this on
current, or on the child pointer in a report_clone callback. For most other cases, it's easier to use utrace_attach_pid instead.
UTRACE_ATTACH_CREATE
Create a new engine. If UTRACE_ATTACH_CREATE is not specified, you only look up an existing engine already attached to the thread.
UTRACE_ATTACH_EXCLUSIVE
Attempting to attach a second (matching) engine fails with -EEXIST.
UTRACE_ATTACH_MATCH_OPS
Only consider engines matching ops.
UTRACE_ATTACH_MATCH_DATA
Only consider engines matching data.
Calls with neither UTRACE_ATTACH_MATCH_OPS nor UTRACE_ATTACH_MATCH_DATA match the first among any engines attached to target. That means
that UTRACE_ATTACH_EXCLUSIVE in such a call fails with -EEXIST if there are any engines on target at all.
Kernel Hackers Manual 2.6. July 2010 UTRACE_ATTACH_TASK(9)
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