1 files changed, 45 insertions, 0 deletions
diff --git a/libc/misc/time/clock.c b/libc/misc/time/clock.c
new file mode 100644
index 000000000..4d1a17869
--- /dev/null
+++ b/libc/misc/time/clock.c
@@ -0,0 +1,45 @@
+/* Copyright (C) 1991, 1992, 1996, 1999 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <sys/times.h>
+#include <time.h>
+#include <unistd.h>
+
+/* Return the time used by the program so far (user time + system time).  */
+clock_t
+clock (void)
+{
+  struct tms buf;
+  long clk_tck = sysconf (_SC_CLK_TCK);
+
+  /* We don't check for errors here.  The only error the kernel
+     returns is EFAULT if the value cannot be written to the struct we
+     pass a pointer to.  Otherwise the kernel returns an `unsigned
+     long' value which is the number of jiffies since system start.
+     But this number can be negative (when read as `long') when the
+     system is up for some time.  Ignoring errors should therefore
+     have no negative impacts but solve the problem.  */
+  times (&buf);
+
+  return
+    (clk_tck <= CLOCKS_PER_SEC)
+    ? ((unsigned long) buf.tms_utime + buf.tms_stime) * (CLOCKS_PER_SEC
+							 / clk_tck)
+    : ((unsigned long) buf.tms_utime + buf.tms_stime) / (clk_tck
+							 / CLOCKS_PER_SEC);
+}