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 13:26:47
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：event_filter_write

函数原型：static ssize_t event_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
1391  err等于负ENODEV
1393  如果cnt大于等于PAGE_SIZE则返回:负EINVAL
1396  buf等于memdup_user_nul(ubuf, cnt)
1397  如果是错误则返回:错误
1400  mutex_lock( & event_mutex)
1401  file等于event_file_data(filp)
1402  如果file则err等于apply_event_filter(file, buf)
1404  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.
1406  kfree(buf)
1407  如果err小于0则返回:err
1410  ppos加等于cnt
1412  返回:cnt