Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\trace\trace.c Create Date:2022-07-28 12:03:05
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name:trace_options_write

Proto:static ssize_t trace_options_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
7983  topt = needed for tty driver, and maybe others
7987  ret = kstrtoul_from_user(ubuf, cnt, 10, & val)
7988  If ret Then Return ret
7991  If val != 0 && val != 1 Then Return -EINVAL
7994  If Not Not (val & Mask assigned in val field in tracer_flags ) != val Then
7995  mutex_lock( & race_types_lock is used to protect the trace_types list.)
7996  ret = __set_tracer_option(tr, flags, opt, !val)
7998  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.
7999  If ret Then Return ret
8003  ppos += cnt
8005  Return cnt