USER_REGSET_ACTIVE_F - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Machine State

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NAMEuser_regset_active_fn − type of active function in struct user_regset

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SYNOPSIStypedef int user_regset_active_fn(struct task_struct * target, const struct user_regset * regset);

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ARGUMENTStarget thread being examined regset regset being examined

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DESCRIPTIONReturn −ENODEV if not available on the hardware found​. Return 0 if no interesting state in this thread​. Return >0 number of size units of interesting state​. Any get call fetching state beyond that number will see the default initialization state for this data, so a caller that knows what the default state is need not copy it all out​. This call is optional; the pointer is NULL if there is no inexpensive check to yield a value < n​. 0

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