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



NAME
       sync - commit buffer cache to disk

SYNOPSIS
       #include 

       void sync(void);

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

ERRORS
       This function is always successful.

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.	 How-
       ever, 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(void)", and sync always returned 0.

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



Linux 2.4			  2001-10-10			      SYNC(2)