函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\trace\trace.c Create Date:2022-07-27 13:09:34
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：trace_options_write

函数原型：static ssize_t trace_options_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos)

返回类型：ssize_t

参数：

类型参数名称
struct file *filp
const char __user *ubuf
size_tcnt
loff_t *ppos
7983  topt等于 needed for tty driver, and maybe others
7987  ret等于kstrtoul_from_user(ubuf, cnt, 10, & val)
7988  如果ret则返回:ret
7991  如果val不等于0且val不等于1则返回:负EINVAL
7994  如果非非val按位与Mask assigned in val field in tracer_flags 的值不等于val则
7995  mutex_lock( & race_types_lock is used to protect the trace_types list.)
7996  ret等于__set_tracer_option(tr, flags, opt, !val)
7998  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.
7999  如果ret则返回:ret
8003  ppos加等于cnt
8005  返回:cnt