Hi all,
I found a way to issue an actual sync() on win32, and as browsing
through winsup directory gave me only this
winsup/sygwin/syscalls.cc #1128
extern "C" int
sync ()
{
return 0;
}
I think cygwin DLL might benefit from a code I found by looking in
sync.exe by M.Russinovich, which is schematically as such:
int
sync( char drive)
{
HANDLE f;
int ret;
char file[7] = "\\\\.\\X:";
file[5] = drive;
f = CreateFile( file, GENERIC_READ|GENERIC_WRITE,
FILE_SHARE_READ|FILE_SHARE_WRITE,
NULL, OPEN_EXISTING, 0, NULL);
if ((int) f < 0)
return -1;
ret = FlushFileBuffers(f) ? 0 : -1;
CloseHandle(f);
return ret;
}
And yes, it is working and doing actual sync of the corresponding file
system,
at least on my w2k machine.
I do not know if there are any issues or why sync() wasn't implemented
yet
but I think this may improve cygwin implementations of sync(), fsync(),
and
probably msync().
Cheers,
Dmitry Karasik
PS. This message is probably better off to developers@ or patches@ or
whatever,
but I don't want to subscribe for sending this letter only.
PPS. If you'd prefer an actual patch instead of the vague code just tell
me and
I'll resubmit.
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