First, Thanks to the following for their responses:
Avraham
David Warren
alan_at_nabeth.cxo.de
Matt Groener
Jeffrey G. Micono
Basically, there really isn't a way to determine CD-ROM /dev files in
a C program. Avraham suggested exec-ing the file command and passing
the information via environment variables. I thought of this as well
but thought it too kludjy. David sent me a program that I have yet to
try, but will. Alan gave me some really good advice concerning not
using the file command to determine the CD-ROMs but to use scu. Matt
agreed that trying this in C would be a considerable endeavor (not for
me ;0). Jeff suggested using statfs(2) which gave almost the
information I needed but not all. So I'm going to write a script that
gets that CD-ROM information and pass the arguments to mountcd. I'll
post the code when complete.
Original Question:
>I'm trying to write a very secure version of mountcd that will do the
>following:
>
>1) When invoked, appends session information to security log.
>
>2) Dynamically determines default CD-ROM device (not statically in the
> program).
>
>3) Prompts user for a CD-ROM device and/or mount point that is not the
> default ones. If the user selects a non-default CD-ROM device, check
> the validity of it.
>
>4) Check mount point directory to ensure it's valid and empty.
>
>5) If all checks, mount CD-ROM.
>
>6) Closes security log.
>
>I've got all of this EXCEPT how to determine if a raw file is a valid
>CD-ROM device. For example, in a shell script (our environment) the
>following command works nicely,
> # file /dev/rrz*c | grep offline | cut -c 1-5,7-10
>How can I do the equivalent in a C program? This is the only thing
>left to do. I really don't want to wrap this is in a script or add a
>system call to the program.
Received on Wed Mar 18 1998 - 17:20:39 NZST