Below is the error I get, using rust distribution nightly-x86_64-pc-windows-msvc (also tried gnu, same error)

error[E0425]: cannot find function `sysconf` in crate `libc`
   --> C:\Users\Ruben Anders\.cargo\registry\src\github.com-1ecc6299db9ec823\sys-info-0.5.10\lib.rs:396:34
    |
396 |             let buf_size = libc::sysconf(libc::_SC_HOST_NAME_MAX) as usize;
    |                                  ^^^^^^^ not found in `libc`

error[E0425]: cannot find value `_SC_HOST_NAME_MAX` in crate `libc`
   --> C:\Users\Ruben Anders\.cargo\registry\src\github.com-1ecc6299db9ec823\sys-info-0.5.10\lib.rs:396:48
    |
396 |             let buf_size = libc::sysconf(libc::_SC_HOST_NAME_MAX) as usize;
    |                                                ^^^^^^^^^^^^^^^^^ not found in `libc`

error[E0425]: cannot find function `gethostname` in crate `libc`
   --> C:\Users\Ruben Anders\.cargo\registry\src\github.com-1ecc6299db9ec823\sys-info-0.5.10\lib.rs:398:22
    |
398 |               if libc::gethostname(buf.as_mut_ptr() as *mut libc::c_char, buf_size) < 0 {
    |                        ^^^^^^^^^^^ help: a function with a similar name exists: `getsockname`
    | 
   ::: C:\Users\Ruben Anders\.cargo\registry\src\github.com-1ecc6299db9ec823\libc-0.2.72\src\windows\mod.rs:556:5
    |
556 | /     pub fn getsockname(
557 | |         s: SOCKET,
558 | |         name: *mut ::sockaddr,
559 | |         nameln: *mut ::c_int,
560 | |     ) -> ::c_int;
    | |_________________- similarly named function `getsockname` defined here

The readme file says to install spork 0.1 from Cargo, but the spork package on crates.io is actually Jarusk/spork. It doesn't look like this library has been published.

It looks like the mach crate currently does not implement the task_info function required to read per-thread CPU and memory information. Until that's updated this module will not be able to handle StatType::Thread on OS X/Darwin. For processes and children POSIX calls seem to work, but for threads Darwin requires using the mach kernel interface.

More info:

• GNU Mach Docs: https://www.gnu.org/software/hurd/gnumach-doc/Task-Information.html
• The Task header file: https://opensource.apple.com/source/xnu/xnu-792.13.8/osfmk/mach/task_info.h.auto.html
• Current implementation: https://github.com/fitzgen/mach/blob/master/src/task.rs
• Examples: http://stackoverflow.com/questions/13893134/get-current-pthread-cpu-usage-mac-os-x, http://stackoverflow.com/questions/5652463/equivalent-to-rusage-thread-darwin

TODO:

• Deal with sizing macros for TASK_BASIC_INFO_COUNT, TASK_EVENTS_INFO_COUNT, and TASK_THREAD_TIMES_INFO_COUNT.
• Implement the new task structs: task_basic_info, task_basic_info_t, task_events_info, task_events_info_t, task_thread_times_info, task_thread_times_info_t, time_value, time_value_t.
• Implement task_info: pub fn task_info(target_task: task_t, flavor: c_int, task_info: *mut task_info_t, task_info_count: *mut mach_msg_type_number_t) -> kern_return_t;

I wonder if this library could provide a way to specify a custom process id when querying stats (cpu, mem) ? (I want to use it to collect stats from sub-processes executed from rust. These sub-processes potentially can be running in parallel where I would like to know the resource information per process basis individually).