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Linux and UNIX Man Pages

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Linux 2.6 - man page for memcpy (linux section 3)

MEMCPY(3)						     Linux Programmer's Manual							 MEMCPY(3)

NAME
memcpy - copy memory area
SYNOPSIS
#include <string.h> void *memcpy(void *dest, const void *src, size_t n);
DESCRIPTION
The memcpy() function copies n bytes from memory area src to memory area dest. The memory areas must not overlap. Use memmove(3) if the memory areas do overlap.
RETURN VALUE
The memcpy() function returns a pointer to dest.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +----------+---------------+---------+ |Interface | Attribute | Value | +----------+---------------+---------+ |memcpy() | Thread safety | MT-Safe | +----------+---------------+---------+
CONFORMING TO
POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.
NOTES
Failure to observe the requirement that the memory areas do not overlap has been the source of significant bugs. (POSIX and the C stan- dards are explicit that employing memcpy() with overlapping areas produces undefined behavior.) Most notably, in glibc 2.13 a performance optimization of memcpy() on some platforms (including x86-64) included changing the order in which bytes were copied from src to dest. This change revealed breakages in a number of applications that performed copying with overlapping areas. Under the previous implementa- tion, the order in which the bytes were copied had fortuitously hidden the bug, which was revealed when the copying order was reversed. In glibc 2.14, a versioned symbol was added so that old binaries (i.e., those linked against glibc versions earlier than 2.14) employed a mem- cpy() implementation that safely handles the overlapping buffers case (by providing an "older" memcpy() implementation that was aliased to memmove(3)).
SEE ALSO
bcopy(3), bstring(3), memccpy(3), memmove(3), mempcpy(3), strcpy(3), strncpy(3), wmemcpy(3) 2017-09-15 MEMCPY(3)

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