On 16.11.2015 17:16, .. ink .. wrote:
On Mon, Nov 16, 2015 at 5:47 PM, Guy <genl...@faert.net> wrote:
- An example: Good old udisks told us the name of files associated with loop
devices. This information is queried directly from the loop device driver,
by using an ioctl call. The consequence is, that this info only is available
when running as root.
It is possible to get a name of a file associated with a loop device
without root's privileges.
The path of the backing file of loop device "/dev/loop0" for
example,can be obtained by reading:
"/sys/block/loop0/loop/backing_file"
Yes, in deed! Thanks for the hint! I copied the ioctl-call from the
udisks source - but your solution is much better!
I updated my test program on faert.net/jangdeblannen/udevblk.c accordingly.
A few comments about your code:
1. No need to cast return value of malloc() as the language will
automatically do it for you.
Lint and g++ are not satisfied without casting. I always do this in
order to get rid of all the warnings.
2. Its perfectly fine to free a NULL pointer and hence no need to
check if a variable is not NULL
before passing it to free()
Maybe. Depends on your philosophy. I do not rely on it; old school,
wasn't allowed when I started programming a long long time ago ;-)
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