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.\" Copyright (c) 1992 Drew Eckhardt (drew@cs.colorado.edu), March 28, 1992
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.\" Formatted or processed versions of this manual, if unaccompanied by
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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.
.\"
.\" Tradotto da Goffredo Baroncelli kreijack@usa.net
.\" Aggiornamento a man-pages-2.11 di Giulio Daprelà <giulio@pluto.it>
.\" novembre 2005
.\" Aggiornamento a man-pages-2.38 di Giulio Daprelà - agosto 2006
.\" Aggiornamento a man-pages-2.64 di Elisabetta Galli - agosto 2007
.\"
.TH SYNC 2 "26 luglio 2007" "Linux" "Linux Programmer's Manual"
.SH NOME
sync \- svuota i buffer della cache del disco
.SH SINTASSI
.B #include <unistd.h>
.sp
.B void sync(void);
.sp
.in -4n
Test delle funzioni e requisiti delle macro per glibc (vedere
.BR feature_test_macros (7)):
.in
.sp
.BR sync ():
_BSD_SOURCE || _XOPEN_SOURCE\ >=\ 500
.SH DESCRIZIONE
.BR sync ()
prima riversa gli inode nei buffer, poi i buffer sul disco.
.SH ERRORI
Questa funzione termina sempre con successo.
.SH "CONFORME A"
SVr4, 4.3BSD, POSIX.1-2001.
.SH NOTE
A partire da glibc 2.2.2 il prototipo Linux è come elencato sopra,
seguendo i vari standard.
In libc4, libc5, e glibc fino a 2.2.1
era "int sync(void)", e
.BR sync ()
restituiva sempre 0.
.SH BACHI
Secondo le specifiche degli standard (per esempio, POSIX.1-2001),
.BR sync ()
programma le scritture, ma potrebbe tornare prima che la
scrittura sia eseguita.
Tuttavia, a partire dalla versione 1.3.20 di Linux, essa aspetta.
(Questo ancora non garantisce l'integrità dei dati: i dischi moderni hanno
grandi cache).
.SH "VEDERE ANCHE"
.BR bdflush (2),
.BR fdatasync (2),
.BR fsync (2),
.BR sync (8),
.BR update (8)