event_filter_read

Name:event_filter_read

Proto:static ssize_t event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)

Type:ssize_t

Parameter:

Type	Parameter	Name
struct file *	filp
char __user *	ubuf
size_t	cnt
loff_t *	ppos

1358

r = -ENODEV

1360

If ppos Then Return 0

1363

s = Allocation memory

1365

If Not s Then Return -ENOMEM

1368

trace_seq_init(s)

1370

mutex_lock( & event_mutex)

1371

file = event_file_data(filp)

1372

If file Then aller must hold event_mutex

1374

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.

1376

If file Then r = simple_read_from_buffer(ubuf, cnt, ppos, buffer, race_seq_used - amount of actual data written to buffer*@s: trace sequence descriptor* Returns the amount of data written to the buffer.* IMPORTANT!* Use this instead of @s->seq.len if you need to pass the amount)

1380

1382

Return r

Source code conversion tool public plug-in interface	X
Support c/c++/esqlc/java Oracle/Informix/Mysql Plug-in can realize: logical Report Code generation and batch code conversion