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.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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.\" References consulted:
.\"     Linux libc source code
.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
.\"     386BSD man pages
.\" Modified Sat Jul 24 18:55:27 1993 by Rik Faith (faith@cs.unc.edu)
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.TH MEMCMP 3 "15 Septiembre 2017" "" "Manual del Programador de Linux"
.SH NOMBRE
memcmp \- compara areas de memoria
.SH SINOPSIS
.nf
\fB#include <string.h>\fP
.PP
\fBint memcmp(const void *\fP\fIs1\fP\fB, const void *\fP\fIs2\fP\fB, size_t \fP\fIn\fP\fB);\fP
.fi
.SH DESCRIPCIÓN
The \fBmemcmp\fP()  function compares the first \fIn\fP bytes (each interpreted as
\fIunsigned char\fP)  of the memory areas \fIs1\fP and \fIs2\fP.
.SH "VALOR DEVUELTO"
The \fBmemcmp\fP()  function returns an integer less than, equal to, or greater
than zero if the first \fIn\fP bytes of \fIs1\fP is found, respectively, to be
less than, to match, or be greater than the first \fIn\fP bytes of \fIs2\fP.
.PP
For a nonzero return value, the sign is determined by the sign of the
difference between the first pair of bytes (interpreted as \fIunsigned char\fP)
that differ in \fIs1\fP and \fIs2\fP.
.PP
If \fIn\fP is zero, the return value is zero.
.SH ATRIBUTOS
Para obtener una explicación de los términos usados en esta sección, véase
\fBattributes\fP(7).
.TS
allbox;
lb lb lb
l l l.
Interfaz	Atributo	Valor
T{
\fBmemcmp\fP()
T}	Seguridad del hilo	Multi\-hilo seguro
.TE
.SH "CONFORME A"
POSIX.1\-2001, POSIX.1\-2008, C89, C99, SVr4, 4.3BSD.
.SH NOTAS
Do not use \fBmemcmp\fP()  to compare security critical data, such as
cryptographic secrets, because the required CPU time depends on the number
of equal bytes.  Instead, a function that performs comparisons in constant
time is required.  Some operating systems provide such a function (e.g.,
NetBSD's \fBconsttime_memequal\fP()), but no such function is specified in
POSIX.  On Linux, it may be necessary to implement such a function oneself.
.SH "VÉASE TAMBIÉN"
\fBbcmp\fP(3), \fBbstring\fP(3), \fBstrcasecmp\fP(3), \fBstrcmp\fP(3), \fBstrcoll\fP(3),
\fBstrncasecmp\fP(3), \fBstrncmp\fP(3), \fBwmemcmp\fP(3)
.SH COLOFÓN
Esta página es parte de la versión 5.10 del proyecto Linux
\fIman\-pages\fP. Puede encontrar una descripción del proyecto, información
sobre cómo informar errores y la última versión de esta página en
\%https://www.kernel.org/doc/man\-pages/.
.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 .