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.TH GETPAGESIZE 2 "15 Septiembre 2017" Linux "Manual del Programador de Linux"
.SH NOMBRE
getpagesize \- obtiene el tamaño de página de memoria
.SH SINOPSIS
\fB#include <unistd.h>\fP
.PP
\fBint getpagesize(void);\fP
.PP
.RS -4
Requisitos de Macros de Prueba de Características para glibc (véase
\fBfeature_test_macros\fP(7)):
.RE
.PP
\fBgetpagesize\fP():
.ad l
.RS 4
.PD 0
.TP  4
Desde glibc 2.19:
.nf
_DEFAULT_SOURCE || ! (_POSIX_C_SOURCE\ >=\ 200112L)
.fi
.TP  4
From glibc 2.12 to 2.19:
.nf
_BSD_SOURCE || ! (_POSIX_C_SOURCE\ >=\ 200112L)
.fi
.TP  4
Antes de glibc 2.12:
.\"    || _XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
_BSD_SOURCE || _XOPEN_SOURCE\ >=\ 500
.PD
.RE
.ad b
.SH DESCRIPCIÓN
.\" .SH HISTORY
.\" This call first appeared in 4.2BSD.
The function \fBgetpagesize\fP()  returns the number of bytes in a memory page,
where "page" is a fixed\-length block, the unit for memory allocation and
file mapping performed by \fBmmap\fP(2).
.SH "CONFORME A"
SVr4, 4.4BSD, SUSv2.  En SUSv2 la llamada \fBgetpagesize\fP() está etiquetada
como "LEGACY", y en POSIX.1\-2001 ha sido eliminada.  HP\-UX no posee esta
llamada.
.SH NOTAS
Portable applications should employ \fIsysconf(_SC_PAGESIZE)\fP instead of
\fBgetpagesize\fP():
.PP
.in +4n
.EX
#include <unistd.h>
long sz = sysconf(_SC_PAGESIZE);
.EE
.in
.PP
(Most systems allow the synonym \fB_SC_PAGE_SIZE\fP for \fB_SC_PAGESIZE\fP.)
.PP
Whether \fBgetpagesize\fP()  is present as a Linux system call depends on the
architecture.  If it is, it returns the kernel symbol \fBPAGE_SIZE\fP, whose
value depends on the architecture and machine model.  Generally, one uses
binaries that are dependent on the architecture but not on the machine
model, in order to have a single binary distribution per architecture.  This
means that a user program should not find \fBPAGE_SIZE\fP at compile time from
a header file, but use an actual system call, at least for those
architectures (like sun4) where this dependency exists.  Here glibc 2.0
fails because its \fBgetpagesize\fP()  returns a statically derived value, and
does not use a system call.  Things are OK in glibc 2.1.
.SH "VÉASE TAMBIÉN"
\fBmmap\fP(2), \fBsysconf\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/.

.SH TRADUCCIÓN
La traducción al español de esta página del manual fue creada por
Miguel Pérez Ibars <mpi79470@alu.um.es>
.

Esta traducción es documentación libre; lea la
.UR https://www.gnu.org/licenses/gpl-3.0.html
GNU General Public License Version 3
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