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
check_timecounter(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);
ATF_TC_HEAD(clock_gettime_real,tc)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
ATF_TC_BODY(clock_gettime_real,tc)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
ATF_TP_ADD_TCS(tp)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