1__STRNCPY_FROM_USER(9)    Memory Management in Linux    __STRNCPY_FROM_USER(9)
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NAME

6       __strncpy_from_user - Copy a NUL terminated string from userspace, with
7       less checking.
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SYNOPSIS

10       long __strncpy_from_user(char * dst, const char __user * src,
11                                long count);
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ARGUMENTS

14       dst
15           Destination address, in kernel space. This buffer must be at least
16           count bytes long.
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18       src
19           Source address, in user space.
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21       count
22           Maximum number of bytes to copy, including the trailing NUL.
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DESCRIPTION

25       Copies a NUL-terminated string from userspace to kernel space. Caller
26       must check the specified block with access_ok before calling this
27       function.
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29       On success, returns the length of the string (not including the
30       trailing NUL).
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32       If access to userspace fails, returns -EFAULT (some data may have been
33       copied).
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35       If count is smaller than the length of the string, copies count bytes
36       and returns count.
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39Kernel Hackers Manual 2.6.         June 2019            __STRNCPY_FROM_USER(9)
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