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 the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18 #if defined(LIBC_SCCS) && !defined(lint) 19 static char sccsid[] = "@(#)clock.c 5.2 (Berkeley) 05/17/90"; 20 #endif /* LIBC_SCCS and not lint */ 21 22 #include <machine/machlimits.h> 23 #include <sys/types.h> 24 #include <sys/time.h> 25 #include <sys/resource.h> 26 27 clock_t 28 clock() 29 { 30 struct rusage rusage; 31 clock_t val; 32 33 if (getrusage(RUSAGE_SELF, &rusage)) 34 return ((clock_t) -1); 35 val = (rusage.ru_utime.tv_sec + rusage.ru_stime.tv_sec) * CLK_TCK; 36 /* 37 * Convert usec to clock ticks; could do (usec * CLK_TCK) / 1000000, 38 * but this would overflow if we switch to nanosec. 39 */ 40 val += (rusage.ru_utime.tv_usec + rusage.ru_stime.tv_usec) / 41 (1000000 / CLK_TCK); 42 return (val); 43 } 44