4.4BSD/usr/share/man/cat2/sync.0

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

NNAAMMEE
     ssyynncc - synchronize disk block in-core status with that on disk

SSYYNNOOPPSSIISS
     ##iinncclluuddee <<uunniissttdd..hh>>

     _v_o_i_d
     ssyynncc(_v_o_i_d);

DDEESSCCRRIIPPTTIIOONN
     The ssyynncc() function forces a write of dirty (modified) buffers in the
     block buffer cache out to disk. The kernel keeps this information in core
     to reduce the number of disk I/O transfers required by the system.  As
     information in the cache is lost after a system crash a ssyynncc() call is
     issued frequently by the user process update(8) (about every 30 seconds).

     The function fsync(2) may be used to synchronize individual file descrip-
     tor attributes.

SSEEEE AALLSSOO
     fsync(2),  sync(8),  update(8)

BBUUGGSS
     SSyynncc() may return before the buffers are completely flushed.

HHIISSTTOORRYY
     A ssyynncc function call appeared in Version 6 AT&T UNIX.

4th Berkeley Distribution        June 4, 1993                                1