[Q: udev] chmod required?

[Q: udev] chmod required?

[Michael Buesch]

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Hi,

Why do we chmod() after mknod() in make_node() ?
Mode is passed as arg1 to mknod(). As I understand
the glibc documentation, this should be enough to set
the file-mode, isn't it?

- --
Regards Michael Buesch  [ http://www.tuxsoft.de.vu ]
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Re: [Q: udev] chmod required?

[Greg KH]

On Tue, Feb 24, 2004 at 08:17:04PM +0100, Michael Buesch wrote:
> Hi,
> 
> Why do we chmod() after mknod() in make_node() ?
> Mode is passed as arg1 to mknod(). As I understand
> the glibc documentation, this should be enough to set
> the file-mode, isn't it?

Unfortunatly no.  The line in the man page to pay attention to is:

	The permissions are modified by the process's umask in the
	usual way: the permissions of the created node are (mode &
	~umask).

That umask logic just messed with everything.  By explictly setting it
with chmod() we solve the problem.  See the old changelog entries for
more details on me struggling with this :)

thanks,

greg k-h


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