Very Computer

Doing a man mount gives the prototypes  They are:
        int  mount(const  char  *specialfile,  const  char * dir ,
        const char * filesystemtype, unsigned long rwflag ,  const
        void * data);

        int umount(const char *specialfile);

The parameters  specialfile, dir, and filesystemtype are quite self-
explainatory, as is the parameter rwflag (I assume 1=rw, 0=ro?).  But the
const void * data parameter, I have no idea what it is used for.  The man
page gives no clue; taking a peek at <sys/mount.h> is no more revealing.

So, I ask you, what is this parameter used for????

Thanks,

/sj/

Scott Johnson --  Graduate Slave, ECE Department, Oregon State University
Check out my new (but unfinished) Web page--http://www.ece.orst.edu/~johnsos
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I bet the Klan wishes they had thought of PC-bashing decades ago...it
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                                                                -Steve Roby

There's a long thread in c.o.l.admin on this with many more complete
answers in it.

ray

: >>I am trying to write a simple suid mount/umount  utility which will allow
: >>me to mount/unmount cdroms/floppies without becoming root.  (I'm the only
: >>one who uses the computer, and I'm not hooked up to a network of any sort,
: >>so security is not a problem.)

: >No need to write a utility for that.
: >Put the following in your /etc/fstab:

: >/dev/fd0  /flop           msdos   umask=0,quiet,user,noauto       1       1

: >Then a user can mount it.  Same for cdrom.

: Caveat: a user can mount it IF ITS AN MSDOS floppy. And not otherwise.
: The above line in /etc/fstab is absolutely no help if the user sticks
: in a minix floppy (for example).

Normally this isnt a problem - but if it is you can normally overcome
it by adding a few lines of the form
/dev/fd0     /flop/dos        msdos   umask=0,quiet,user,noauto
/dev/fd0     /flop/minix      minix   umask=0,quiet,user,noauto
(etc)

Sure, it's not perfect, but it works...

  Scott.