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



NAME
       sync - commit buffer cache to disk.

SYNOPSIS
       #include <unistd.h>

       void sync(c);

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

CONFORMING TO
       SVr4, SVID, X/OPEN, BSD 4.3

BUGS
       According to  the  standard  specification  (e.g.,  SVID),
       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.)

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(c)", and sync always
       returned 0.

SEE ALSO
       bdflush(h), fsync(c), fdatasync(c), update(e), sync(c)



Linux 2.4                   2001-10-10                    SYNC(C)