byte locking bug?
davecb at canada.sun.com
Wed Jan 19 12:55:52 GMT 2000
| I'm having trouble with file locking in DOS over Samba. The trouble
| Samba seems to be translating my lock request to a different range.
| We attempt to put a lock on the byte 0x7ffffff0 from one of the
| however when we run a UNIX program that reveals where the lock was
| the file it indicates that the lock was put at 0x3ffffff0.
Yes, the lock requests are indeed being mapped, to avoid
the last two bits of a 32-bit quantity. This avoids
some disfeatures of a number of Unix OSs.
It's probably better to lock a byte that's within the file
than use a lock past the end for an IPC mechanism. There
was a dicussion the the tchnical list a few days ago about
reworking the locks, so I'd be cautious about depending on
anything past the end of the file: the implementation is,
as always, free to change.
David Collier-Brown, | Always do right. This will gratify some people
185 Ellerslie Ave., | and astonish the rest. -- Mark Twain
Willowdale, Ontario | //www.oreilly.com/catalog/samba/author.html
Work: (905) 415-2849 Home: (416) 223-8968 Email: davecb at canada.sun.com
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