diff options
Diffstat (limited to 'lib/libc/sys/sync.2')
| -rw-r--r-- | lib/libc/sys/sync.2 | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/lib/libc/sys/sync.2 b/lib/libc/sys/sync.2 index 6b16b1f967e3..89c2583dc444 100644 --- a/lib/libc/sys/sync.2 +++ b/lib/libc/sys/sync.2 @@ -47,21 +47,22 @@ .Sh DESCRIPTION The .Fn sync -function forces a write of dirty (modified) buffers +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 +As information in the cache is lost after a system crash, a .Fn sync -call is issued +system call is issued frequently by the user process .Xr syncer 4 (about every 30 seconds). .Pp -The function +The .Xr fsync 2 +system call may be used to synchronize individual file descriptor attributes. .Sh SEE ALSO @@ -69,10 +70,12 @@ attributes. .Xr syncer 4 , .Xr sync 8 .Sh BUGS -.Fn Sync +The +.Fn sync +system call may return before the buffers are completely flushed. .Sh HISTORY -A +The .Fn sync -function call appeared in +function appeared in .At v6 . |