darwin_libproc/
pid_rusage.rs

1use std::io;
2use std::mem;
3
4pub use darwin_libproc_sys::{
5    rusage_info_v0, rusage_info_v1, rusage_info_v2, rusage_info_v3,
6    rusage_info_v4,
7};
8
9mod private {
10    pub trait Sealed {}
11    impl Sealed for darwin_libproc_sys::rusage_info_v0 {}
12    impl Sealed for darwin_libproc_sys::rusage_info_v1 {}
13    impl Sealed for darwin_libproc_sys::rusage_info_v2 {}
14    impl Sealed for darwin_libproc_sys::rusage_info_v3 {}
15    impl Sealed for darwin_libproc_sys::rusage_info_v4 {}
16}
17
18/// `proc_pid_rusage` can return different versioned `rusage_info_v*` structs.
19///
20/// This sealed trait implemented for all possible variants
21/// and used by [`pid_rusage`]
22pub trait RusageFlavor: private::Sealed {
23    #[doc(hidden)]
24    fn flavor() -> libc::c_int;
25}
26
27impl RusageFlavor for rusage_info_v0 {
28    fn flavor() -> libc::c_int {
29        darwin_libproc_sys::RUSAGE_INFO_V0
30    }
31}
32
33impl RusageFlavor for rusage_info_v1 {
34    fn flavor() -> libc::c_int {
35        darwin_libproc_sys::RUSAGE_INFO_V1
36    }
37}
38
39impl RusageFlavor for rusage_info_v2 {
40    fn flavor() -> libc::c_int {
41        darwin_libproc_sys::RUSAGE_INFO_V2
42    }
43}
44
45impl RusageFlavor for rusage_info_v3 {
46    fn flavor() -> libc::c_int {
47        darwin_libproc_sys::RUSAGE_INFO_V3
48    }
49}
50
51impl RusageFlavor for rusage_info_v4 {
52    fn flavor() -> libc::c_int {
53        darwin_libproc_sys::RUSAGE_INFO_V4
54    }
55}
56
57/// Return resource usage information for the given pid, which can be a live process or a zombie.
58pub fn pid_rusage<T: RusageFlavor>(pid: libc::pid_t) -> io::Result<T> {
59    let mut rusage = mem::MaybeUninit::<T>::uninit();
60    let result = unsafe {
61        darwin_libproc_sys::proc_pid_rusage(
62            pid,
63            T::flavor(),
64            rusage.as_mut_ptr() as *mut _,
65        )
66    };
67
68    if result < 0 {
69        Err(io::Error::last_os_error())
70    } else {
71        Ok(unsafe { rusage.assume_init() })
72    }
73}
darwin_libproc/pid_rusage.rs

darwin_libproc/
pid_rusage.rs
