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 13:09:37
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：trace_options_core_read

函数原型：static ssize_t trace_options_core_read(struct file *filp, 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
char __user *ubuf
size_tcnt
loff_t *ppos
8053  tr_index等于 needed for tty driver, and maybe others
8058  In order to pass in both the trace_array descriptor as well as the index* to the flag that the trace option file represents, the trace_array* has a character array of trace_flags_index[], which holds the index* of the bit for the flag it represents
8060  如果trace_flags按位与1左移index位则buf等于"1\n"
8062  否则buf等于"0\n"
8065  返回:simple_read_from_buffer(ubuf, cnt, ppos, buf, 2)