exact_copy_from

Name:Some copy_from_user() implementations do not return the exact number of* bytes remaining to copy on a fault. But copy_mount_options() requires that.* Note that this function differs from copy_from_user() in that it will oops

Proto:static long exact_copy_from_user(void *to, const void __user *from, unsigned long n)

Type:long

Parameter:

Type	Parameter	Name
void *	to
const void __user *	from
unsigned long	n

2991

t = to

2992

__user * f = from

2995

If Not access_ok - Checks if a user space pointer is valid*@addr: User space pointer to start of block to check*@size: Size of block to check* Context: User context only. This function may sleep if pagefaults are* enabled.(from, n) Then Return n

2998

When n cycle

2999

If Get a simple variable from user space, with less checking(c, f) Then

3000

memset(t, 0, n)

3001

Break

3003

t++ = c

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f++

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n--

3007

Return n

**Caller**
Name	Describe
copy_mount_options

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

Function report