xref: /386bsd/usr/share/man/cat2/sync.0 (revision a2142627) 
1SYNC(2)                   386BSD Programmer's Manual                   SYNC(2)
2
3NNAAMMEE
4     ssyynncc - synchronize disk block in-core status with that on disk
5
6SSYYNNOOPPSSIISS
7     ##iinncclluuddee <<uunniissttdd..hh>>
8
9     _v_o_i_d
10     ssyynncc(_v_o_i_d)
11
12DDEESSCCRRIIPPTTIIOONN
13     The ssyynncc() function forces a write of dirty (modified) buffers in the
14     block buffer cache out to disk. The kernel keeps this information in core
15     to reduce the number of disk I/O transfers required by the system.  As
16     information in the cache is lost after a system crash a ssyynncc() call is
17     issued frequently by the user process update(8) (about every 30 seconds).
18
19     The function fsync(2) may be used to synchronize individual file
20     descriptor attributes.
21
22SSEEEE AALLSSOO
23     fsync(2),  sync(8),  update(8)
24
25BBUUGGSS
26     SSyynncc() may return before the buffers are completely flushed.
27
28HHIISSTTOORRYY
29     A ssyynncc function call appeared in Version 6 AT&T UNIX.
30
314th Berkeley Distribution       March 10, 1991                               1
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67