bin+lib libproc

A rust wrapper of libproc to get information about running processes - Mac OS X and Linux

10 releases (6 breaking)

✓ Uses Rust 2018 edition

0.7.1 Oct 13, 2019
0.6.0 Oct 11, 2019
0.4.0 Mar 10, 2019
0.3.2 Nov 3, 2018
0.1.0 Aug 22, 2016
Download history 189/week @ 2020-01-22 86/week @ 2020-01-29 60/week @ 2020-02-05 168/week @ 2020-02-12 120/week @ 2020-02-19 120/week @ 2020-02-26 217/week @ 2020-03-04 131/week @ 2020-03-11 88/week @ 2020-03-18 33/week @ 2020-03-25 82/week @ 2020-04-01 105/week @ 2020-04-08 140/week @ 2020-04-15 107/week @ 2020-04-22 99/week @ 2020-04-29 151/week @ 2020-05-06

500 downloads per month
Used in 5 crates (4 directly)

MIT license

1.5K SLoC

Build Status


This is a library for getting information about running processes for Mac OS X and Linux.

Using it

extern crate libproc;
use libproc::libproc::proc_pid;


match proc_pid::pidpath(pid) {
    Ok(path) => {
        println!("PID {}: has path {}", pid, path);
    Err(err) => writeln!(&mut std::io::stderr(), "Error: {}", err).unwrap()


Run "cargo doc" and then open "./target/doc/libproc/index.html". More documentation will be added over time.


At the moment these methods have been implemented:

Process / PID related

pub fn listpids(proc_types: ProcType) -> Result<Vec<u32>, String> (macos) (linux)
pub fn pidinfo<T: PIDInfo>(pid : i32, arg: u64) -> Result<T, String> (macos)
pub fn regionfilename(pid: i32, address: u64) -> Result<String, String> (macos)
pub fn pidpath(pid : i32) -> Result<String, String> (macos) (linux)
pub fn libversion() -> Result<(i32, i32), String> (macos)
pub fn name(pid: i32) -> Result<String, String> (linux) (macos)
pub fn listpidinfo<T: ListPIDInfo>(pid : i32, max_len: usize) -> Result<Vec<T::Item>, String> (macos)
pub fn pidcwd(pid: pid_t) -> Result<PathBuf, String> (linux)
pub fn cwdself() -> Result<PathBuf, String> (linux)

File and FileDescriptor related

pub fn pidfdinfo<T: PIDFDInfo>(pid : i32, fd: i32) -> Result<T, String> (macos)

PID Resource Usage related

pub fn pidrusage<T: PIDRUsage>(pid : i32) -> Result<T, String> (macos)


I have also implemented this method - but the MAGIC_NUMBER returned is not correct, and upon investigation it seems that Apple/Darwin/Mach have changed totally how dmessage works in latest versions, moving away from using libproc to use kvm - with a total rewrite of dmesg.

I leave it in for now, but some serious revision of the library, with conditional compilation depending on which version of Mac OS X and/or Darwin will be required to get a version that works broadly :-(

See Github issue

pub fn kmsgbuf() -> Result<String, String>


cargo build builds the following binaries:

  • procinfo that takes a PID as an optional argument (uses it's own pid if none supplied) and returns information about the process on stdout
  • dmesg is a version of dmesg implemented in rust that uses libproc-rs. This must be run as root. Currently fails (see above and bug).


Mac OS X and work started on Linux.

Build and Test

cargo test should build and test as usual for rust projects.

However, as some functions need to be run as root to work, I run travis-CI tests as root. So, when developing in local it's best if you use sudo cargo test. NOTE: This can get you into permissions problems when switching back and for between using cargo test and sudo cargo test. To fix that run sudo cargo clean and then build or test as you prefer.

In order to have tests pass when run as root or not, some tests need to check if they are root at run-time (using our own am_root() function is handy) and avoid failing if not run as root.

Input Requested

  • Suggestions for API, module re-org and cross-platform abstractions are welcome.
  • How to do error reporting? Define own new Errors, or keep simple with Strings?
  • Would like Path/PathBuf returned when it makes sense instead of String?


See the list of issues. I put the "help wanted" label where I need help from others.

  • Look at what similar methods could be implemented as a starting point on Linux
  • Complete the API on Mac OS X - figuring out all the Mac OS X / Darwin version mess....
  • Add more documentation (including samples with documentation test)
  • Add own custom error type and implement From::from to ease reporting of multiple error types in clients


This code is licensed under MIT license (see LICENCE).


You are welcome to fork this repo and make a pull request, or write an issue.