Add a "fork" of musl as //fusl.

fusl/src/time/clock.c

Index: fusl/src/time/clock.c
diff --git a/fusl/src/time/clock.c b/fusl/src/time/clock.c
new file mode 100644
index 0000000000000000000000000000000000000000..c348e39836caec86425652d6e0e3259ff9c05a2c
--- /dev/null
+++ b/fusl/src/time/clock.c
@@ -0,0 +1,18 @@
+#include <time.h>
+#include <limits.h>
+
+int __clock_gettime(clockid_t, struct timespec *);
+
+clock_t clock()
+{
+	struct timespec ts;
+
+	if (__clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts))
+		return -1;
+
+	if (ts.tv_sec > LONG_MAX/1000000
+	 || ts.tv_nsec/1000 > LONG_MAX-1000000*ts.tv_sec)
+		return -1;
+
+	return ts.tv_sec*1000000 + ts.tv_nsec/1000;
+}