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Annotation of 43BSDReno/lib/libc/gen/clock.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1989 The Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted
                      6:  * provided that: (1) source distributions retain this entire copyright
                      7:  * notice and comment, and (2) distributions including binaries display
                      8:  * the following acknowledgement:  ``This product includes software
                      9:  * developed by the University of California, Berkeley and its contributors''
                     10:  * in the documentation or other materials provided with the distribution
                     11:  * and in all advertising materials mentioning features or use of this
                     12:  * software. Neither the name of the University nor the names of its
                     13:  * contributors may be used to endorse or promote products derived
                     14:  * from this software without specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  */
                     19: 
                     20: #if defined(LIBC_SCCS) && !defined(lint)
                     21: static char sccsid[] = "@(#)clock.c    5.3 (Berkeley) 6/1/90";
                     22: #endif /* LIBC_SCCS and not lint */
                     23: 
                     24: #include <machine/machlimits.h>
                     25: #include <sys/types.h>
                     26: #include <sys/time.h>
                     27: #include <sys/resource.h>
                     28: 
                     29: clock_t
                     30: clock()
                     31: {
                     32:        struct rusage rusage;
                     33:        clock_t val;
                     34: 
                     35:        if (getrusage(RUSAGE_SELF, &rusage))
                     36:                return ((clock_t) -1);
                     37:        val = (rusage.ru_utime.tv_sec + rusage.ru_stime.tv_sec) * CLK_TCK;
                     38:        /*
                     39:         * Convert usec to clock ticks; could do (usec * CLK_TCK) / 1000000,
                     40:         * but this would overflow if we switch to nanosec.
                     41:         */
                     42:        val += (rusage.ru_utime.tv_usec + rusage.ru_stime.tv_usec) /
                     43:                (1000000 / CLK_TCK);
                     44:        return (val);
                     45: }

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