.\" -*- coding: UTF-8 -*-
'\" t
.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
.\" and Copyright 2015 Michael Kerrisk <mtk.manpages@gmail.com>
.\"
.\" SPDX-License-Identifier: Linux-man-pages-copyleft
.\"
.\" References consulted:
.\"     Linux libc source code
.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
.\"     386BSD man pages
.\" Modified Sun Jul 25 10:41:09 1993 by Rik Faith (faith@cs.unc.edu)
.\"*******************************************************************
.\"
.\" This file was generated with po4a. Translate the source file.
.\"
.\"*******************************************************************
.TH memcpy 3 "2 Mayo 2024" "Páginas de Manual de Linux 6.8" 
.SH NOMBRE
memcpy \- copiar area de memoria
.SH BIBLIOTECA
Biblioteca Estándar C (\fIlibc\fP, \fI\-lc\fP)
.SH SINOPSIS
.nf
\fB#include <string.h>\fP
.P
\fBvoid *memcpy(void \fP\fIdest\fP\fB[restrict .\fP\fIn\fP\fB], const void \fP\fIsrc\fP\fB[restrict .\fP\fIn\fP\fB],\fP
\fB             size_t \fP\fIn\fP\fB);\fP
.fi
.SH DESCRIPCIÓN
The \fBmemcpy\fP()  function copies \fIn\fP bytes from memory area \fIsrc\fP to
memory area \fIdest\fP.  The memory areas must not overlap.  Use \fBmemmove\fP(3)
if the memory areas do overlap.
.SH "VALOR DEVUELTO"
La funcion \fBmemcpy\fP() devuelve un puntero a \fIdest\fP.
.SH ATRIBUTOS
Para obtener una explicación de los términos usados en esta sección, véase
\fBattributes\fP(7).
.TS
allbox;
lbx lb lb
l l l.
Interfaz	Atributo	Valor
T{
.na
.nh
\fBmemcpy\fP()
T}	Seguridad del hilo	Multi\-hilo seguro
.TE
.SH ESTÁNDARES
C11, POSIX.1\-2008.
.SH HISTORIAL
POSIX.1\-2001, C89, SVr4, 4.3BSD.
.SH CAVEATS
.\" glibc commit 6fb8cbcb58a29fff73eb2101b34caa19a7f88eba
.\" From forward copying to backward copying
Failure to observe the requirement that the memory areas do not overlap has
been the source of significant bugs.  (POSIX and the C standards are
explicit that employing \fBmemcpy\fP()  with overlapping areas produces
undefined behavior.)  Most notably, in glibc 2.13 a performance optimization
of \fBmemcpy\fP()  on some platforms (including x86\-64) included changing the
order in which bytes were copied from \fIsrc\fP to \fIdest\fP.
.P
.\" Adobe Flash player was the highest profile example:
.\"   https://bugzilla.redhat.com/show_bug.cgi?id=638477
.\"   Reported: 2010-09-29 02:35 EDT by JCHuynh
.\"   Bug 638477 - Strange sound on mp3 flash website
.\"
.\"   https://sourceware.org/bugzilla/show_bug.cgi?id=12518
.\"   Bug 12518 - memcpy acts randomly (and differently) with overlapping areas
.\"   Reported:       2011-02-25 02:26 UTC by Linus Torvalds
.\"
.\" glibc commit 0354e355014b7bfda32622e0255399d859862fcd
This change revealed breakages in a number of applications that performed
copying with overlapping areas.  Under the previous implementation, 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 \fBmemcpy\fP()  implementation
that safely handles the overlapping buffers case (by providing an "older"
\fBmemcpy\fP()  implementation that was aliased to \fBmemmove\fP(3)).
.SH "VÉASE TAMBIÉN"
\fBbcopy\fP(3), \fBbstring\fP(3), \fBmemccpy\fP(3), \fBmemmove\fP(3), \fBmempcpy\fP(3),
\fBstrcpy\fP(3), \fBstrncpy\fP(3), \fBwmemcpy\fP(3)
.PP
.SH TRADUCCIÓN
La traducción al español de esta página del manual fue creada por
Vicente Pastor Gómez <vpastorg@santandersupernet.com>
y
Juan Piernas <piernas@ditec.um.es>
.
.PP
Esta traducción es documentación libre; lea la
.UR https://www.gnu.org/licenses/gpl-3.0.html
GNU General Public License Version 3
.UE
o posterior con respecto a las condiciones de copyright.
No existe NINGUNA RESPONSABILIDAD.
.PP
Si encuentra algún error en la traducción de esta página del manual, envíe un
correo electrónico a
.MT debian-l10n-spanish@lists.debian.org
.ME .