Permission Denied on linux

[jacek-kurlit]

Hello,

When I try to use this create I receive error
{ code: 13, kind: PermissionDenied, message: "Permission denied" }
All I do is calling let ports = listeners::get_all();

I'm using fedora 40, is there any limitation on linux systems?
I want to use this create in my tool but I cannot force user to run as root

[jacek-kurlit]

I tried to debug where this error comes from and I have found this place
helpers::build_inode_proc_map()
linie 17
let dir_fd = rustix::fs::openat(

[jacek-kurlit]

I have found some solution by filtering error_kind == PermissionDenied

        let dir_fd = match dir_fd {
            Ok(fd) => fd,
            Err(e) if e.kind() == ErrorKind::PermissionDenied => {
                continue;
            }
            Err(e) => return Err(Box::new(e)),
        };

I can create PR with fix if you are interested

[GyulyVGC]

Hey @jacek-kurlit thank you so much for this ticket and for your solution, you can feel free to open a PR and I'll be happy to merge.
As you've said, this error is generated from the fact that some processes are run with privileges and cannot be seen by regular users. I used to run this library as sudo on Linux, but if we can improve this aspect by letting normal users see standard processes, that's actually a good idea.

[GyulyVGC]

Actually you can skip all kind of errors... a change I should apply also in other places of the code is to ignore all the errors that are related to a specific process but that don't compromise other processes.

[jacek-kurlit]

Hi!

I have created PR #10

I didn't go as far to ignore all errors as I wasn't sure if this is good idea to swallow error without any info for lib user.
Also I have changed code by simply checking user permissions to read fd before opening it.