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__COPY_TO_USER(9) Memory Management in Linux __COPY_TO_USER(9)

NAME

__copy_to_user - Copy a block of data into user space, with less checking.

SYNOPSIS

unsigned long __copy_to_user(void __user * to, const void * from, unsigned long n);

ARGUMENTS

void __user * to

Destination address, in user space.

const void * from

Source address, in kernel space.

unsigned long n

Number of bytes to copy.

CONTEXT

User context only. This function may sleep if pagefaults are enabled.

DESCRIPTION

Copy data from kernel space to user space. Caller must check the specified block with access_ok before calling this function.

Returns number of bytes that could not be copied. On success, this will be zero.

COPYRIGHT

June 2017 Kernel Hackers Manual 4.11