Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\trace\trace.c Create Date:2022-07-28 12:03:20
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name:rb_simple_read

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

Type:ssize_t

Parameter:

TypeParameterName
struct file *filp
char __user *ubuf
size_tcnt
loff_t *ppos
8262  tr = needed for tty driver, and maybe others
8266  r = racer_tracing_is_on - show real state of ring buffer enabled*@tr : the trace array to know if ring buffer is enabled* Shows real state of the ring buffer if it is enabled or not.
8267  r = sprintf(buf, "%d\n", r)
8269  Return simple_read_from_buffer(ubuf, cnt, ppos, buf, r)