.\" Hey Emacs! This file is -*- nroff -*- source.
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.\" Copyright (c) 1992 Drew Eckhardt (drew@cs.colorado.edu), March 28, 1992
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.\" Permission is granted to copy and distribute modified versions of this
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.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date.  The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein.  The author(s) may not
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.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
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.\" Modified by Michael Haardt <michael@moria.de>
.\" Modified Sat Jul 24 12:02:47 1993 by Rik Faith <faith@cs.unc.edu>
.\" Modified 15 Apr 1995 by Michael Chastain <mec@shell.portal.com>:
.\"   Added reference to `bdflush(2)'.
.\" Modified 960414 by Andries Brouwer <aeb@cwi.nl>:
.\"   Added the fact that since 1.3.20 sync actually waits.
.\" Modified Tue Oct 22 22:27:07 1996 by Eric S. Raymond <esr@thyrsus.com>
.\" Modified 2001-10-10 by aeb, following Michael Kerrisk.
.\" Translated into Spanish Wed Feb 4 1998 by Gerardo Aburruzaga
.\" García <gerardo.aburruzaga@uca.es>
.\" Revisado por Miguel Pérez Ibars <mpi79470@alu.um.es> el 1-diciembre-2004
.\"
.TH SYNC 2 "10 octubre 2001" "Linux 2.4" "Manual del Programador de Linux"
.SH NOMBRE
sync \- entrega el búfer caché al disco
.SH SINOPSIS
.B #include <unistd.h>
.sp
.B void sync(void);
.SH DESCRIPCIÓN
.B sync
primero entrega los nodos-í a los búferes, y luego éstos al disco.
.SH "CONFORME A"
SVr4, SVID, X/OPEN, BSD 4.3
.SH FALLOS
De acuerdo con la especificación del estándar (p. ej., SVID),
\fBsync()\fP planifica las escrituras, pero puede regresar antes de
que la escritura real tenga lugar.
Sin embargo, desde la versión 1.3.20, Linux sí espera realmente.
(Esto aún no garantiza la integridad de los datos: los discos modernos
tienen grandes cachés.)
.SH OBSERVACIONES
Desde glibc 2.2.2 el prototipo de Linux es como se muestra arriba,
siguiendo varios estándares. En libc4, libc5, y glibc hasta la versión 2.2.1
el prototipo era "int sync(void)", y sync siempre devolvía 0.
.SH "VÉASE TAMBIÉN"
.BR bdflush (2),
.BR fsync (2),
.BR fdatasync (2),
.BR update (8),
.BR sync (8)