Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\trace\trace.c Create Date:2022-07-28 12:03:08
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name:trace_options_core_read

Proto:static ssize_t trace_options_core_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
8053  tr_index = 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  If trace_flags & 1 << index Then buf = "1\n"
8062  Else buf = "0\n"
8065  Return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2)