reg_event_syscall_enter

Name:reg_event_syscall_enter

Proto:static int reg_event_syscall_enter(struct trace_event_file *file, struct trace_event_call *call)

Type:int

Parameter:

Type	Parameter	Name
struct trace_event_file *	file
struct trace_event_call *	call

412

tr = tr

413

ret = 0

416

num = syscall_nr

417

If WARN_ON_ONCE(num < 0 || num >= NR_syscalls) Then Return -ENOSYS

419

mutex_lock( & syscall_trace_lock)

420

If Not sys_refcount_enter Then ret = register_trace_sys_enter(ftrace_syscall_enter, tr)

422

If Not ret Then

423

cu_assign_pointer() - assign to RCU-protected pointer*@p: pointer to assign to*@v: value to assign (publish)* Assigns the specified value to the specified RCU-protected* pointer, ensuring that any concurrent RCU readers will see* any prior initialization(enter_syscall_files[num], file)

424

sys_refcount_enter++

426

mutex_unlock - release the mutex*@lock: the mutex to be released* Unlock a mutex that has been locked by this task previously.* This function must not be used in interrupt context. Unlocking* of a not locked mutex is not allowed.

427

Return ret

**Caller**
Name	Describe
syscall_enter_register

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