procfs 0.12.0

Interface to the linux procfs pseudo-filesystem
Documentation 
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use procfs::process::{FDTarget, Process};
use std::path::Path;
use std::{ffi::CString, os::unix::ffi::OsStrExt};

fn main() {
    let myself = Process::myself().unwrap();
    let mountinfo = myself.mountinfo().unwrap();

    for lock in procfs::locks().unwrap() {
        lock.pid
            .and_then(|pid| Process::new(pid).ok())
            .and_then(|proc| proc.cmdline().ok())
            .and_then(|mut cmd| cmd.drain(..).next())
            .map_or_else(
                || {
                    print!("{:18}", "(undefined)");
                },
                |s| {
                    let p = Path::new(&s);
                    print!(
                        "{:18}",
                        p.file_name().unwrap_or_else(|| p.as_os_str()).to_string_lossy()
                    );
                },
            );

        print!("{:<12} ", lock.pid.unwrap_or(-1));
        print!("{:12} ", lock.lock_type.as_str());
        print!("{:12} ", lock.mode.as_str());
        print!("{:12} ", lock.kind.as_str());

        // try to find the path for this inode
        let mut found = false;
        if let Some(pid) = lock.pid {
            if let Ok(fds) = Process::new(pid).and_then(|p| p.fd()) {
                for fd in fds {
                    if let FDTarget::Path(p) = fd.target {
                        let cstr = CString::new(p.as_os_str().as_bytes()).unwrap();

                        let mut stat = unsafe { std::mem::zeroed() };
                        if unsafe { libc::stat(cstr.as_ptr(), &mut stat) } == 0 && stat.st_ino as u64 == lock.inode {
                            print!("{}", p.display());
                            found = true;
                            break;
                        }
                    }
                }
            }
        }

        if !found {
            // we don't have a PID or we don't have permission to inspect the processes files, but we still have the device and inode
            // There's no way to look up a path from an inode, so just bring the device mount point
            for mount in &mountinfo {
                if format!("{}:{}", lock.devmaj, lock.devmin) == mount.majmin {
                    print!("{}...", mount.mount_point.display());
                    found = true;
                    break;
                }
            }
        }

        if !found {
            // still not found? print the device
            print!("{}:{}", lock.devmaj, lock.devmin);
        }

        println!();
    }
}