diff --git a/sortix/include/sortix/clock.h b/sortix/include/sortix/clock.h
index 9c8b4795..b6e533f1 100644
--- a/sortix/include/sortix/clock.h
+++ b/sortix/include/sortix/clock.h
@@ -34,7 +34,11 @@ __BEGIN_DECLS
 #define CLOCK_BOOT 2 /* Time since system boot (uptime). */
 #define CLOCK_INIT 3 /* Time since 'init' process began. */
 #define CLOCK_PROCESS_CPUTIME_ID 4
-#define CLOCK_THREAD_CPUTIME_ID 5
+#define CLOCK_PROCESS_SYSTIME_ID 5
+#define CLOCK_CHILD_CPUTIME_ID 6
+#define CLOCK_CHILD_SYSTIME_ID 7
+#define CLOCK_THREAD_CPUTIME_ID 8
+#define CLOCK_THREAD_SYSTIME_ID 9
 
 __END_DECLS
 
diff --git a/sortix/time.cpp b/sortix/time.cpp
index 2d5864fd..47262b6f 100644
--- a/sortix/time.cpp
+++ b/sortix/time.cpp
@@ -61,6 +61,10 @@ Clock* GetClock(clockid_t clock)
 	case CLOCK_BOOT: return uptime_clock;
 	case CLOCK_INIT: return uptime_clock;
 	case CLOCK_MONOTONIC: return uptime_clock;
+	case CLOCK_PROCESS_CPUTIME_ID: return &CurrentProcess()->execute_clock;
+	case CLOCK_PROCESS_SYSTIME_ID: return &CurrentProcess()->system_clock;
+	case CLOCK_CHILD_CPUTIME_ID: return &CurrentProcess()->child_execute_clock;
+	case CLOCK_CHILD_SYSTIME_ID: return &CurrentProcess()->child_system_clock;
 	default: return errno = ENOTSUP, (Clock*) NULL;
 	}
 }