t_clock_gettime.c revision 1.3
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 <sys/cdefs.h> 59 __COPYRIGHT("@(#) Copyright (c) 2008\ 60 The NetBSD Foundation, inc. All rights reserved."); 61 __RCSID("$NetBSD: t_clock_gettime.c,v 1.3 2017/01/13 21:30:41 christos Exp $"); 62 63 #include <sys/param.h> 64 #include <sys/sysctl.h> 65 66 67 #include <atf-c.h> 68 #include <errno.h> 69 #include <limits.h> 70 #include <stdio.h> 71 #include <stdint.h> 72 #include <stdlib.h> 73 #include <string.h> 74 #include <time.h> 75 #include <unistd.h> 76 77 #include "h_macros.h" 78 79 #define MINPOSDIFF 15000000 /* 15 ms for now */ 80 #define TIMEOUT 5 81 82 #define TC_HARDWARE "kern.timecounter.hardware" 83 #define TC_CHOICE "kern.timecounter.choice" 84 85 static void 86 check_timecounter(void) 87 { 88 struct timespec tsa, tsb, tsl, res; 89 long long mindiff = INTMAX_MAX; 90 time_t endlimit; 91 92 #define CL(x) \ 93 do { \ 94 if ((x) != -1) \ 95 break; \ 96 atf_tc_fail_nonfatal("%s: %s", #x, strerror(errno)); \ 97 return; \ 98 } while (0) 99 100 CL(clock_gettime(CLOCK_REALTIME, &tsa)); 101 tsl = tsa; 102 103 CL(time(&endlimit)); 104 endlimit += TIMEOUT + 1; 105 106 while ((time_t)tsa.tv_sec < endlimit) { 107 long long diff; 108 109 CL(clock_gettime(CLOCK_REALTIME, &tsb)); 110 diff = 1000000000LL * (tsb.tv_sec - tsa.tv_sec) 111 + tsb.tv_nsec - tsa.tv_nsec; 112 113 if (diff > 0 && mindiff > diff) 114 mindiff = diff; 115 116 if (diff < 0 || diff > MINPOSDIFF) { 117 long long elapsed; 118 (void)printf("%stime TSA: 0x%jx.%08jx, TSB: 0x%jx.%08jx, " 119 "diff = %lld nsec, ", (diff < 0) ? "BAD " : "", 120 (uintmax_t)tsa.tv_sec, (uintmax_t)tsa.tv_nsec, 121 (uintmax_t)tsb.tv_sec, (uintmax_t)tsb.tv_nsec, diff); 122 123 elapsed = 1000000000LL * (tsb.tv_sec - tsl.tv_sec) 124 + tsb.tv_nsec - tsl.tv_nsec; 125 126 127 (void)printf("%lld nsec\n", elapsed); 128 tsl = tsb; 129 130 ATF_CHECK(diff >= 0); 131 if (diff < 0) 132 return; 133 } 134 135 tsa.tv_sec = tsb.tv_sec; 136 tsa.tv_nsec = tsb.tv_nsec; 137 } 138 139 if (clock_getres(CLOCK_REALTIME, &res) == 0) { 140 long long r = res.tv_sec * 1000000000 + res.tv_nsec; 141 142 (void)printf("Claimed resolution: %lld nsec (%f Hz) or " 143 "better\n", r, 1.0 / r * 1e9); 144 (void)printf("Observed minimum non zero delta: %lld " 145 "nsec\n", mindiff); 146 } 147 148 #undef CL 149 } 150 151 ATF_TC(clock_gettime_real); 152 ATF_TC_HEAD(clock_gettime_real, tc) 153 { 154 atf_tc_set_md_var(tc, "require.user", "root"); 155 atf_tc_set_md_var(tc, "descr", 156 "Checks the monotonicity of the CLOCK_REALTIME implementation"); 157 atf_tc_set_md_var(tc, "timeout", "300"); 158 } 159 160 ATF_TC_BODY(clock_gettime_real, tc) 161 { 162 char name[128], cbuf[512], ctrbuf[10240]; 163 size_t cbufsiz = sizeof(cbuf); 164 size_t ctrbufsiz = sizeof(ctrbuf); 165 const char *p; 166 char *save; 167 int quality, n; 168 169 if (sysctlbyname(TC_HARDWARE, cbuf, &cbufsiz, NULL, 0) != 0) { 170 (void)printf("\nChecking legacy time implementation " 171 "for %d seconds\n", TIMEOUT); 172 check_timecounter(); 173 return; 174 /* NOTREACHED */ 175 } 176 (void)printf("%s = %s\n", TC_HARDWARE, cbuf); 177 REQUIRE_LIBC(save = strdup(cbuf), NULL); 178 179 RL(sysctlbyname(TC_CHOICE, ctrbuf, &ctrbufsiz, NULL, 0)); 180 (void)printf("%s = %s\n", TC_CHOICE, ctrbuf); 181 182 for (p = ctrbuf, n = 0; sscanf(p, "%127[^(](q=%d, f=%*u Hz)%*[ ]%n", 183 name, &quality, &n) == 2; p += n) { 184 struct timespec ts; 185 int ret; 186 187 if (quality < 0) 188 continue; 189 190 (void)printf("\nChecking %s for %d seconds\n", name, TIMEOUT); 191 CHECK_LIBC(ret = sysctlbyname(TC_HARDWARE, NULL, 0, 192 name, strlen(name)), -1); 193 if (ret == -1) 194 continue; 195 196 /* wait a bit to select new counter in clockinterrupt */ 197 ts.tv_sec = 0; 198 ts.tv_nsec = 100000000; 199 (void)nanosleep(&ts, NULL); 200 201 check_timecounter(); 202 } 203 204 RL(sysctlbyname(TC_HARDWARE, NULL, 0, save, strlen(save))); 205 } 206 207 ATF_TP_ADD_TCS(tp) 208 { 209 210 ATF_TP_ADD_TC(tp, clock_gettime_real); 211 212 return atf_no_error(); 213 } 214
Indexes created Wed Sep 24 05:09:52 GMT 2025