Fix maxrss on macos

On BSDs ru_maxrss measures in bytes,
so fix output for bsd systems (incl macos)

1 files changed, 12 insertions, 0 deletions

diff --git a/src/wait/rusage_ffi.rs b/src/wait/rusage_ffi.rs
index 5948958..0a9117a 100644
--- a/src/wait/rusage_ffi.rs
+++ b/src/wait/rusage_ffi.rs
@@ -51,3 +51,15 @@ impl From<libc::rusage> for Rusage {
         }
     }
 }
+
+impl Rusage {
+    pub fn get_rss_bytes(&self) -> i64 {
+        if cfg!(target_os = "macos") {
+            self.ru_maxrss
+        } else if cfg!(target_os = "linux") {
+            self.ru_maxrss * 1000 // on linux ru_maxrss is in kilobytes
+        } else {
+            unimplemented!();
+        }
+    }
+}
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