1USER_REGSET_ACTIVE_F(9)          Machine State         USER_REGSET_ACTIVE_F(9)
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NAME

6       user_regset_active_fn - type of active function in struct user_regset
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SYNOPSIS

9       typedef int user_regset_active_fn(struct task_struct * target,
10                                         const struct user_regset * regset);
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ARGUMENTS

13       target
14           thread being examined
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16       regset
17           regset being examined
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DESCRIPTION

20       Return -ENODEV if not available on the hardware found. Return 0 if no
21       interesting state in this thread. Return >0 number of size units of
22       interesting state. Any get call fetching state beyond that number will
23       see the default initialization state for this data, so a caller that
24       knows what the default state is need not copy it all out. This call is
25       optional; the pointer is NULL if there is no inexpensive check to yield
26       a value < n.
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30Kernel Hackers Manual 2.6.         June 2019           USER_REGSET_ACTIVE_F(9)
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