Re: Locking Devices on the SUN IPC

In article 28783@dssmktg.com, rob@dssmktg.com (Rob Minter) writes: > I,ve tried posting in comp.unix to no avail. comp.unix.sun may be better (see .sig :-) > We are trying to lock devices on a SUN IPC running under 4.1.3 OS level, IPC on 4.1.2 here > and keep getting errors of 2,6, and 13. > No such file Which gets you this ? I couldn't on any file. Sure it's not a typo ? > No such device skyline# cat /dev/rsd9a cat: /dev/rsd9a: No such device or address if it really isn't there. > permission denied playpen 5171> cat /dev/rsd0a cat: /dev/rsd0a: Permission denied since the disk is playpen 5173> ls -lg /dev/rsd0a crw-r----- 1 root operator 17, 0 Jan 18 11:20 /dev/rsd0a as G*d intended. > ... C fcntl code deleted ... > Somehow error keeps getting set to one of those values indicated above. > If anyone can help - Thanks, in advance. Unfortunately, there's a bug logged against fcntl (and indirectly, flock(2), I suspect), 1055536. This says that you'll get EINVAL "Invalid argument" if you try to lock a special device in > 4.0.3. Integrated in 5.2. I see the EINVAL if I fcntl something that *is* there and *is* r/w (/dev/rfd0c). Since you're not getting EINVAL, looks like perms probs. However, if you really have to do this, prod your Sun support for a patch and consider using semaphores/shared memory/<add your own ipc here> meantime. > Robert Minter Data Systems Support > Programmer, Software Development Orange, CA > internet: rob@dssmktg.com Tel: 714.771.0454 > bangpath: uunet.uu.net!dssmktg!rob Fax: 714.771.3028 Hope you don't mind me posting, just occurred to me that others may be trying to do this. Good flames CC by email, please, case I miss 'em ... Disclaimer: "It wasn't me, it was the squirrels" Cheers ! Tony.Heskett@sun.co.uk Direct: (+44) 276 416490, (+44) 831 546576 Hotline: (+44) 276 691974 Recep'n: (+44) 276 20444 x490 Fax: (+44) 276 416655