Re: [gentoo-user] how to access mounted dir with non-root?

[Ciaran McCreesh <ciaranm@gentoo.org>]

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On Fri, 12 Aug 2005 21:45:44 +0200 Holly Bostick <motub@planet.nl>
wrote:
| If umask masks bits off of the 'default' permissions, then what is the
| point of umask=000? It seems that it would leave the permissions as
| the default, which appear to be 755 (is there a creation mask of 022
| somewhere in the 'default' settings? I can't find it, if so), unless
| you've explicitly set them to soemthing else.

umask 'masks' the bits. So umask=000 means "use whatever the
application uses when creating things without knocking off any bits".
Most system calls that create files or directories also take a
parameter for mode, which is where the 755 comes from. For example, for
mkdir(2):

> int mkdir(const char *pathname, mode_t mode);
> (...)
> The  parameter mode specifies the permissions to use. It is
> modified by the process's umask in the usual way: the permissions  of
> the  created directory  are  (mode & ~umask & 0777).  Other mode bits
> of the created directory depend on the operating system.  For Linux,
> see below.


-- 
Ciaran McCreesh : Gentoo Developer (Vim, Shell tools, Fluxbox, Cron)
Mail            : ciaranm at gentoo.org
Web             : http://dev.gentoo.org/~ciaranm


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