LibC: Don't ASSERT in times

Return the current process CPU time as user time. We don't have a way to
get system/user time separation or CPU times of child processes

userspace/libraries/LibC/sys/times.cpp

@@ -1,9 +1,26 @@
 #include <sys/times.h>
+#include <time.h>
+#include <unistd.h>
 
-#include <BAN/Assert.h>
+static inline clock_t timespec_to_clock_t(const timespec& ts)
+{
+	static clock_t clock_tick = -1;
+	if (clock_tick == -1)
+		clock_tick = sysconf(_SC_CLK_TCK);
+
+	return ts.tv_sec * clock_tick + ts.tv_nsec * clock_tick / 1'000'000'000;
+}
 
 clock_t times(struct tms* buffer)
 {
-	(void)buffer;
-	ASSERT_NOT_REACHED();
+	// FIXME: system time, child times
+	*buffer = {};
+
+	timespec ts;
+
+	clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
+	buffer->tms_utime = timespec_to_clock_t(ts);
+
+	clock_gettime(CLOCK_MONOTONIC, &ts);
+	return timespec_to_clock_t(ts);
 }