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MEMCPY(3) Library Functions Manual MEMCPY(3)

copy bytes

#include <string.h>
void *
memcpy(void *dst, const void *src, size_t len);

The memcpy() function copies len bytes from buffer src to buffer dst. If the two buffers may overlap, memmove(3) must be used instead.

The memcpy() function returns the original value of dst.

bcopy(3), memccpy(3), memmove(3), strcpy(3), strlcpy(3), wmemcpy(3)

The memcpy() function conforms to ANSI X3.159-1989 (“ANSI C89”).

The memcpy() function first appeared in AT&T System V UNIX and was reimplemented for 4.3BSD-Tahoe.
June 5, 2013 OpenBSD-current