From 37818e1a25c68063f2e36b2cb24349643b44f34d Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Wed, 25 Feb 2026 23:11:43 +0000
Subject: [PATCH] Add getrusage suite to sys.

Signed-off-by: Jason Volk <jason@zemos.net>
---
 src/core/utils/sys.rs       |  3 ++-
 src/core/utils/sys/usage.rs | 25 +++++++++++++++++++++++++
 2 files changed, 27 insertions(+), 1 deletion(-)
 create mode 100644 src/core/utils/sys/usage.rs

diff --git a/src/core/utils/sys.rs b/src/core/utils/sys.rs
index 66f224c8..43712487 100644
--- a/src/core/utils/sys.rs
+++ b/src/core/utils/sys.rs
@@ -1,10 +1,11 @@
 pub mod compute;
 pub mod limits;
 pub mod storage;
+pub mod usage;
 
 use std::path::PathBuf;
 
-pub use self::{compute::available_parallelism, limits::*};
+pub use self::{compute::available_parallelism, limits::*, usage::*};
 use crate::{Result, at};
 
 /// Return a possibly corrected std::env::current_exe() even if the path is
diff --git a/src/core/utils/sys/usage.rs b/src/core/utils/sys/usage.rs
new file mode 100644
index 00000000..6bf6f01a
--- /dev/null
+++ b/src/core/utils/sys/usage.rs
@@ -0,0 +1,25 @@
+use nix::sys::resource::Usage;
+#[cfg(unix)]
+use nix::sys::resource::{UsageWho, getrusage};
+
+use crate::Result;
+
+#[cfg(unix)]
+pub fn usage() -> Result<Usage> { getrusage(UsageWho::RUSAGE_SELF).map_err(Into::into) }
+
+#[cfg(not(unix))]
+pub fn usage() -> Result<Usage> { Ok(Usage::default()) }
+
+#[cfg(any(
+	target_os = "linux",
+	target_os = "freebsd",
+	target_os = "openbsd"
+))]
+pub fn thread_usage() -> Result<Usage> { getrusage(UsageWho::RUSAGE_THREAD).map_err(Into::into) }
+
+#[cfg(not(any(
+	target_os = "linux",
+	target_os = "freebsd",
+	target_os = "openbsd"
+)))]
+pub fn thread_usage() -> Result<Usage> { Ok(Usage::default()) }