函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\trace\trace_syscalls.c Create Date:2022-07-27 13:29:28
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：reg_event_syscall_enter

函数原型：static int reg_event_syscall_enter(struct trace_event_file *file, struct trace_event_call *call)

返回类型：int

参数：

类型参数名称
struct trace_event_file *file
struct trace_event_call *call
412  tr等于tr
413  ret等于0
416  num等于syscall_nr
417  如果WARN_ON_ONCE(num < 0 || num >= NR_syscalls)则返回:负ENOSYS
419  mutex_lock( & syscall_trace_lock)
420  如果非sys_refcount_enter则ret等于register_trace_sys_enter(ftrace_syscall_enter, tr)
422  如果非ret则
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自加
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  返回:ret
调用者
名称描述
syscall_enter_register