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Man Pages


Manual Reference Pages  -  SYNC (2)

NAME

sync - schedule file system updates

CONTENTS

Library
Synopsis
Description
See Also
History
Bugs

LIBRARY


.Lb libc

SYNOPSIS


.In unistd.h void sync void

DESCRIPTION

The sync system call 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 sync system call is issued frequently by the user process syncer(4) (about every 30 seconds).

The fsync(2) system call may be used to synchronize individual file descriptor attributes.

SEE ALSO

fsync(2), syncer(4), sync(8)

HISTORY

The sync function appeared in AT&T v6 .

BUGS

The sync system call may return before the buffers are completely flushed.
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