sync2 - Flush file system metadata and data from memory
buffers to disk
unsigned int POLICY,
char *path );
Flush the file system memory buffers to disk. The argument
is one of the following: Flush all memory buffers. Specifying
this flag causes the function to behave the same as
the sync() function. See sync(2). Flush all memory
buffers except those under smooth sync control. The name
of a UFS file system or AdvFS fileset. Specify the
optional path parameter when you want to have the POLICY
act only on that file system instead of all file systems.
Specify a NULL argument when you want to have the POLICY
act on all file systems.
The sync2() function causes file system data to be flushed
(written) to disk. Which memory buffers are flushed to
disk depends on the POLICY argument.
If the policy is SYNC_SYNCPOLICY, all memory buffers are
flushed to disk. If the policy is SYNC_SMOOTHSYNCPOLICY,
all memory buffers except those under smooth sync control
are flushed to disk.
To which file systems the POLICY argument applies depends
on the path argument. To apply the policy to one file
system, name it in the path argument. To apply the policy
to all file systems, specify the path argument as NULL.
The writing, although scheduled, is not necessarily complete
upon return from the sync2() function.
See the description of the smoothsync_age attribute in
sys_attrs_vfs(5) for the definition of the smooth sync age
period. See the description of the M_SMSYNC2 flag in
mount(2) for information on enabling an alternate smooth
Functions: mount(2), sync(2)
Others: standards(5), sys_attrs_vfs(5)
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