1 /* $NetBSD: t_clock_gettime.c,v 1.3 2017/01/13 21:30:41 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Frank Kardel. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /*- 33 * Copyright (c) 2006 Frank Kardel 34 * All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 45 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 46 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 47 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 48 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 49 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 50 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 51 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 52 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 53 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 54 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 55 * POSSIBILITY OF SUCH DAMAGE. 56 */ 57 58 #include "macros.h" 59 60 #include <sys/cdefs.h> 61 __COPYRIGHT("@(#) Copyright (c) 2008\ 62 The NetBSD Foundation, inc. All rights reserved."); 63 __RCSID("$NetBSD: t_clock_gettime.c,v 1.3 2017/01/13 21:30:41 christos Exp $"); 64 65 #include <sys/param.h> 66 #include <sys/sysctl.h> 67 68 69 #include "atf-c.h" 70 #include <errno.h> 71 #include <limits.h> 72 #include <stdio.h> 73 #include <stdint.h> 74 #include <stdlib.h> 75 #include <string.h> 76 #include <time.h> 77 #include <unistd.h> 78 79 #include "h_macros.h" 80 81 #define MINPOSDIFF 15000000 /* 15 ms for now */ 82 #define TIMEOUT 5 83 84 #define TC_HARDWARE "kern.timecounter.hardware" 85 #define TC_CHOICE "kern.timecounter.choice" 86 87 static void 88 check_timecounter(void) 89 { 90 struct timespec tsa, tsb, tsl, res; 91 long long mindiff = INTMAX_MAX; 92 time_t endlimit; 93 94 #define CL(x) \ 95 do { \ 96 if ((x) != -1) \ 97 break; \ 98 atf_tc_fail_nonfatal("%s: %s", #x, strerror(errno)); \ 99 return; \ 100 } while (0) 101 102 CL(clock_gettime(CLOCK_REALTIME, &tsa)); 103 tsl = tsa; 104 105 CL(time(&endlimit)); 106 endlimit += TIMEOUT + 1; 107 108 while ((time_t)tsa.tv_sec < endlimit) { 109 long long diff; 110 111 CL(clock_gettime(CLOCK_REALTIME, &tsb)); 112 diff = 1000000000LL * (tsb.tv_sec - tsa.tv_sec) 113 + tsb.tv_nsec - tsa.tv_nsec; 114 115 if (diff > 0 && mindiff > diff) 116 mindiff = diff; 117 118 if (diff < 0 || diff > MINPOSDIFF) { 119 long long elapsed; 120 (void)printf("%stime TSA: 0x%jx.%08jx, TSB: 0x%jx.%08jx, " 121 "diff = %lld nsec, ", (diff < 0) ? "BAD " : "", 122 (uintmax_t)tsa.tv_sec, (uintmax_t)tsa.tv_nsec, 123 (uintmax_t)tsb.tv_sec, (uintmax_t)tsb.tv_nsec, diff); 124 125 elapsed = 1000000000LL * (tsb.tv_sec - tsl.tv_sec) 126 + tsb.tv_nsec - tsl.tv_nsec; 127 128 129 (void)printf("%lld nsec\n", elapsed); 130 tsl = tsb; 131 132 ATF_CHECK(diff >= 0); 133 if (diff < 0) 134 return; 135 } 136 137 tsa.tv_sec = tsb.tv_sec; 138 tsa.tv_nsec = tsb.tv_nsec; 139 } 140 141 if (clock_getres(CLOCK_REALTIME, &res) == 0) { 142 long long r = res.tv_sec * 1000000000 + res.tv_nsec; 143 144 (void)printf("Claimed resolution: %lld nsec (%f Hz) or " 145 "better\n", r, 1.0 / r * 1e9); 146 (void)printf("Observed minimum non zero delta: %lld " 147 "nsec\n", mindiff); 148 } 149 150 #undef CL 151 } 152 153 ATF_TC(clock_gettime_real); 154 ATF_TC_HEAD(clock_gettime_real, tc) 155 { 156 atf_tc_set_md_var(tc, "require.user", "root"); 157 atf_tc_set_md_var(tc, "descr", 158 "Checks the monotonicity of the CLOCK_REALTIME implementation"); 159 atf_tc_set_md_var(tc, "timeout", "300"); 160 } 161 162 ATF_TC_BODY(clock_gettime_real, tc) 163 { 164 char name[128], cbuf[512], ctrbuf[10240]; 165 size_t cbufsiz = sizeof(cbuf); 166 size_t ctrbufsiz = sizeof(ctrbuf); 167 const char *p; 168 char *save; 169 int quality, n; 170 171 if (sysctlbyname(TC_HARDWARE, cbuf, &cbufsiz, NULL, 0) != 0) { 172 (void)printf("\nChecking legacy time implementation " 173 "for %d seconds\n", TIMEOUT); 174 check_timecounter(); 175 return; 176 /* NOTREACHED */ 177 } 178 (void)printf("%s = %s\n", TC_HARDWARE, cbuf); 179 REQUIRE_LIBC(save = strdup(cbuf), NULL); 180 181 RL(sysctlbyname(TC_CHOICE, ctrbuf, &ctrbufsiz, NULL, 0)); 182 (void)printf("%s = %s\n", TC_CHOICE, ctrbuf); 183 184 for (p = ctrbuf, n = 0; sscanf(p, "%127[^(](q=%d, f=%*u Hz)%*[ ]%n", 185 name, &quality, &n) == 2; p += n) { 186 struct timespec ts; 187 int ret; 188 189 if (quality < 0) 190 continue; 191 192 (void)printf("\nChecking %s for %d seconds\n", name, TIMEOUT); 193 CHECK_LIBC(ret = sysctlbyname(TC_HARDWARE, NULL, 0, 194 name, strlen(name)), -1); 195 if (ret == -1) 196 continue; 197 198 /* wait a bit to select new counter in clockinterrupt */ 199 ts.tv_sec = 0; 200 ts.tv_nsec = 100000000; 201 (void)nanosleep(&ts, NULL); 202 203 check_timecounter(); 204 } 205 206 RL(sysctlbyname(TC_HARDWARE, NULL, 0, save, strlen(save))); 207 } 208 209 ATF_TP_ADD_TCS(tp) 210 { 211 212 ATF_TP_ADD_TC(tp, clock_gettime_real); 213 214 return atf_no_error(); 215 } 216