diff options
Diffstat (limited to 'lib/libc/gen/clock.c')
-rw-r--r-- | lib/libc/gen/clock.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/lib/libc/gen/clock.c b/lib/libc/gen/clock.c new file mode 100644 index 0000000..fe867c2 --- /dev/null +++ b/lib/libc/gen/clock.c @@ -0,0 +1,57 @@ +/* + * Copyright (c) 1989, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)clock.c 8.1 (Berkeley) 6/4/93"; +#endif /* LIBC_SCCS and not lint */ + +#include <sys/param.h> +#include <sys/time.h> +#include <sys/resource.h> + +/* + * Convert usec to clock ticks; could do (usec * CLOCKS_PER_SEC) / 1000000, + * but this would overflow if we switch to nanosec. + */ +#define CONVTCK(r) ((r).tv_sec * CLOCKS_PER_SEC \ + + (r).tv_usec / (1000000 / CLOCKS_PER_SEC)) + +clock_t +clock() +{ + struct rusage ru; + + if (getrusage(RUSAGE_SELF, &ru)) + return ((clock_t) -1); + return((clock_t)((CONVTCK(ru.ru_utime) + CONVTCK(ru.ru_stime)))); +} |