1 /* $NetBSD: times.c,v 1.14 2005/09/13 01:44:09 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 #if 0 35 static char sccsid[] = "@(#)times.c 8.1 (Berkeley) 6/4/93"; 36 #else 37 __RCSID("$NetBSD: times.c,v 1.14 2005/09/13 01:44:09 christos Exp $"); 38 #endif 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include "namespace.h" 42 #include <sys/param.h> 43 #include <sys/time.h> 44 #include <sys/times.h> 45 #include <sys/resource.h> 46 47 #include <assert.h> 48 #include <errno.h> 49 #include <time.h> 50 51 /* 52 * Convert usec to clock ticks; could do (usec * CLK_TCK) / 1000000, 53 * but this would overflow if we switch to nanosec. 54 */ 55 #define CONVTCK(r) (r.tv_sec * clk_tck + r.tv_usec / (1000000 / (uint)clk_tck)) 56 57 clock_t 58 times(tp) 59 struct tms *tp; 60 { 61 struct rusage ru; 62 struct timeval t; 63 static clock_t clk_tck; 64 65 _DIAGASSERT(tp != NULL); 66 67 /* 68 * we use a local copy of CLK_TCK because it expands to a 69 * moderately expensive function call. 70 */ 71 if (clk_tck == 0) 72 clk_tck = (clock_t)CLK_TCK; 73 74 if (getrusage(RUSAGE_SELF, &ru) < 0) 75 return ((clock_t)-1); 76 tp->tms_utime = CONVTCK(ru.ru_utime); 77 tp->tms_stime = CONVTCK(ru.ru_stime); 78 if (getrusage(RUSAGE_CHILDREN, &ru) < 0) 79 return ((clock_t)-1); 80 tp->tms_cutime = CONVTCK(ru.ru_utime); 81 tp->tms_cstime = CONVTCK(ru.ru_stime); 82 if (gettimeofday(&t, (struct timezone *)0)) 83 return ((clock_t)-1); 84 return ((clock_t)(CONVTCK(t))); 85 } 86