table of contents
other versions
- wheezy 3.2.78-1
__STRNCPY_FROM_USER(9) | Memory Management in Linux | __STRNCPY_FROM_USER(9) |
NAME¶
__strncpy_from_user - Copy a NUL terminated string from userspace, with less checking.SYNOPSIS¶
long
__strncpy_from_user(char * dst,
const char __user * src,
long count);
ARGUMENTS¶
dstDestination address, in kernel space. This
buffer must be at least count bytes long.
src
Source address, in user space.
count
Maximum number of bytes to copy, including the
trailing NUL.
DESCRIPTION¶
Copies a NUL-terminated string from userspace to kernel space. Caller must check the specified block with access_ok before calling this function. On success, returns the length of the string (not including the trailing NUL). If access to userspace fails, returns -EFAULT (some data may have been copied). If count is smaller than the length of the string, copies count bytes and returns count.COPYRIGHT¶
March 2016 | Kernel Hackers Manual 3.2. |