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SYNC(2)                    Linux Programmer's Manual                   SYNC(2)



NAME
       sync - commit buffer cache to disk

SYNOPSIS
       #include <unistd.h>

       void sync(void);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       sync(): _BSD_SOURCE || _XOPEN_SOURCE >= 500

DESCRIPTION
       sync() first commits inodes to buffers, and then buffers to disk.

ERRORS
       This function is always successful.

CONFORMING TO
       SVr4, 4.3BSD, POSIX.1-2001.

NOTES
       Since  glibc  2.2.2  the Linux prototype is as listed above, following the various standards.  In libc4, libc5,
       and glibc up to 2.2.1 it was "int sync(void)", and sync() always returned 0.

BUGS
       According to the standard specification (e.g., POSIX.1-2001), sync()  schedules  the  writes,  but  may  return
       before  the  actual writing is done.  However, since version 1.3.20 Linux does actually wait.  (This still does
       not guarantee data integrity: modern disks have large caches.)

SEE ALSO
       bdflush(2), fdatasync(2), fsync(2), sync(8), update(8)

COLOPHON
       This page is part of release 3.22 of the Linux man-pages project.  A description of the project,  and  informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                             2007-07-26                           SYNC(2)