News Group Posts

Samba semaphores

A semaphore is a kernel mechanism to control shared access to resources. Semaphores can be binary (meaning that if a process holds a semaphore on a resource, nothing else can use it until that process relinqueshes the semaphore) or more complicated.

Conceptually, it's like creating a lock file but of course much more efficient as it is done in the kernel.

See Understanding semaphores.

From: chriseli@my-deja.com
Newsgroups: comp.unix.sco.misc
Subject: Re: Samba on SCO
Date: Tue, 29 Feb 2000 22:58:55 GMT
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I've read before that the semaphore problem is a bug on Samba 2.0.5a and
there isn't a cure for it yet except for this workaround (that I've also
picked up from this newsgroup but forgot who posted it):

1. Kill smbd and nmbd processes

2. Run "ipcs -as" to list all active semaphores.

3. Remove the semaphore entry for Samba. The row with Key=0x00280269 is
Samba's. To remove it, run "ipcrm -s $ID" where $ID is the ID of the
Samba Semphore.

4. Start Samba again (eg. /usr/local/samba/bin/smbd -D and nmbd -D)

5. Make sure that the first connection with Samba is clean by doing

smbclient -L host_name -U username

When you do smbclient again, the report should be clean (no errors).

PS. I don't know what a semaphore is either. Sorry.

In article <88b8f1$c14$1@nereid.worldonline.nl>,
  "t035230" <mark.lassooy@europe.eds.com> wrote:

> What the hell is a semaphore, it seems to be a memory thing, but I
> don't know how to set it up, ans the man page is not clear to me
>
> Who knows
> =========================
> mark.lassooy@europe.eds.com
> =========================
>
>


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