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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 information about reporting bugs, can be found at http://www.ker-
       nel.org/doc/man-pages/.



Linux                             2007-07-26                           SYNC(2)

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