Panic with error: IoErrorWrapper { path: "/proc/net/udp", inner: None }

[desbma]

I'm getting an error a few second after startup:

'display_handler' panicked at 'called `Result::unwrap()` on an `Err` value: Io(Custom { kind: Other, error: IoErrorWrapper { path: "/proc/net/udp", inner: None } }, Some("/proc/net/udp"))', src/libcore/result.rs:1165:5

Full log with RUST_BACKTRACE=full (indentation is messed up): https://pastebin.com/raw/qGVpSjG0

Environment: Ubuntu 18.04 AMD64, up to date, with the 0.7.0 musl binary.

EDIT: /proc/net/udp exists and is readable.

[zhangxp1998]

Probably caused by this line

bandwhich/src/os/linux.rs

Line 25 in c2d18bd

let tcp = ::procfs::net::tcp().unwrap();

I'm surprised that we are simply unwrap()ing stuff... Better to return None or empty vector instead.

[zhangxp1998]

Fixed by #88