Use a better package name for utility functions.

osutils/reaper.go

@@ -0,0 +1,38 @@
+package osutils
+
+import (
+	"syscall"
+
+	"github.com/opencontainers/runc/libcontainer/utils"
+)
+
+// Exit is the wait4 information from an exited process
+type Exit struct {
+	Pid    int
+	Status int
+}
+
+// Reap reaps all child processes for the calling process and returns their
+// exit information
+func Reap() (exits []Exit, err error) {
+	var (
+		ws  syscall.WaitStatus
+		rus syscall.Rusage
+	)
+	for {
+		pid, err := syscall.Wait4(-1, &ws, syscall.WNOHANG, &rus)
+		if err != nil {
+			if err == syscall.ECHILD {
+				return exits, nil
+			}
+			return exits, err
+		}
+		if pid <= 0 {
+			return exits, nil
+		}
+		exits = append(exits, Exit{
+			Pid:    pid,
+			Status: utils.ExitStatus(ws),
+		})
+	}
+}