MirOS Manual: sync(2)

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

NAME

     sync - synchronize disk block in-core status with that on disk

SYNOPSIS

     #include <unistd.h>

     void
     sync(void);

DESCRIPTION

     The sync() 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 in-
     formation in the cache is lost after a system crash a sync() call is is-
     sued frequently by the in-kernel process update(8) (about every 30
     seconds).

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

SEE ALSO

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

HISTORY

     A sync() function call appeared in Version 2 AT&T UNIX.

BUGS

     sync() may return before the buffers are completely flushed.

MirOS BSD #10-current            June 4, 1993                                1

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