Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\trace\trace.c Create Date:2022-07-28 12:01:26
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name:tracing_set_trace_write

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

Type:ssize_t

Parameter:

TypeParameterName
struct file *filp
const char __user *ubuf
size_tcnt
loff_t *ppos
5836  tr = needed for tty driver, and maybe others
5842  ret = cnt
5844  If cnt > MAX_TRACER_SIZE Then cnt = MAX_TRACER_SIZE
5847  If copy_from_user(buf, ubuf, cnt) Then Return -EFAULT
5850  buf[cnt] = 0
5853  When i > 0 && Note: isspace() must return false for %NUL-terminator (buf[i]) cycle buf[i] = 0
5856  err = tracing_set_tracer(tr, buf)
5857  If err Then Return err
5860  ppos += ret
5862  Return ret