函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\trace\trace_events.c Create Date:2022-07-27 13:26:56
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：subsystem_filter_write

函数原型：static ssize_t subsystem_filter_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
1539  dir等于 needed for tty driver, and maybe others
1543  如果cnt大于等于PAGE_SIZE则返回:负EINVAL
1546  buf等于memdup_user_nul(ubuf, cnt)
1547  如果是错误则返回:错误
1550  err等于apply_subsystem_event_filter(dir, buf)
1551  kfree(buf)
1552  如果err小于0则返回:err
1555  ppos加等于cnt
1557  返回:cnt