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SYNC(2) UNIX 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