Fix maxrss on macos

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

2 files changed, 13 insertions, 1 deletions

diff --git a/src/main.rs b/src/main.rs
index b25443d..0d54445 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -59,7 +59,7 @@ fn main() {
                         eprintln!("wall time: {:?}", status.wall_time);
                     }
                     if matches.is_present("mem") {
-                        eprintln!("rss: {}K", status.usage.ru_maxrss);
+                        eprintln!("rss: {}K", status.usage.get_rss_bytes() / 1000);
                     }
                 },
                 Err(err) => error!("{}", err)
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!();
+        }
+    }
+}
\ No newline at end of file