memcpy(3)                  Library Functions Manual                  memcpy(3)

NOMBRE
       memcpy - copiar area de memoria

BIBLIOTECA
       Biblioteca Estandar C (libc, -lc)

SINOPSIS
       #include <string.h>

       void *memcpy(void dest[restrict .n], const void src[restrict .n],
                    size_t n);

DESCRIPCION
       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.

VALOR DEVUELTO
       La funcion memcpy() devuelve un puntero a dest.

ATRIBUTOS
       Para obtener una explicacion de los terminos usados en esta seccion,
       vease attributes(7).

       +-----------------------------+--------------------+-------------------+
       |Interfaz                     | Atributo           | Valor             |
       +-----------------------------+--------------------+-------------------+
       |memcpy()                     | Seguridad del hilo | Multi-hilo seguro |
       +-----------------------------+--------------------+-------------------+
ESTANDARES
       C11, POSIX.1-2008.

HISTORIAL
       POSIX.1-2001, C89, SVr4, 4.3BSD.

CAVEATS
       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 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
       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 memcpy()  implementation that safely handles the overlapping
       buffers case (by providing an "older" memcpy()  implementation that was
       aliased to memmove(3)).

VEASE TAMBIEN
       bcopy(3), bstring(3), memccpy(3), memmove(3), mempcpy(3), strcpy(3),
       strncpy(3), wmemcpy(3)

TRADUCCION
       La traduccion al espanol de esta pagina del manual fue creada por
       Vicente Pastor Gomez <vpastorg@santandersupernet.com> y Juan Piernas
       <piernas@ditec.um.es>

       Esta traduccion es documentacion libre; lea la GNU General Public
       License Version 3 <https://www.gnu.org/licenses/gpl-3.0.html> o
       posterior con respecto a las condiciones de copyright.  No existe
       NINGUNA RESPONSABILIDAD.

       Si encuentra algun error en la traduccion de esta pagina del manual,
       envie un correo electronico a <debian-l10n-spanish@lists.debian.org>.

Paginas de manual de Linux 6.06 31 Octubre 2023                      memcpy(3)