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1 /* | |
2 * Test clock resolution for KVM guests that have kvm-clock as clock source | |
3 * | |
4 * Copyright (c) 2010 Red Hat, Inc | |
5 * Author: Lucas Meneghel Rodrigues <lmr@redhat.com> | |
6 * | |
7 * This program is free software; you can redistribute it and/or modify | |
8 * it under the terms of the GNU General Public License as published by | |
9 * the Free Software Foundation; either version 2 of the License, or | |
10 * (at your option) any later version. | |
11 * | |
12 * This program is distributed in the hope that it will be useful, | |
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 * GNU General Public License for more details. | |
16 * | |
17 * You should have received a copy of the GNU General Public License | |
18 * along with this program; if not, see <http://www.gnu.org/licenses/>. | |
19 */ | |
20 #include <stdio.h> | |
21 #include <time.h> | |
22 #include <stdlib.h> | |
23 #include <string.h> | |
24 | |
25 int main(void) { | |
26 struct timespec res; | |
27 int clock_return = clock_getres(CLOCK_MONOTONIC, &res); | |
28 char clocksource[50]; | |
29 char line[80]; | |
30 FILE *fr; | |
31 if ((fr = fopen( | |
32 "/sys/devices/system/clocksource/clocksource0/current_cl
ocksource", | |
33 "rt")) == NULL) { | |
34 perror("fopen"); | |
35 return EXIT_FAILURE; | |
36 } | |
37 while (fgets(line, 80, fr) != NULL) { | |
38 sscanf(line, "%s", &clocksource); | |
39 } | |
40 fclose(fr); | |
41 if (!strncmp(clocksource, "kvm-clock", strlen("kvm-clock"))) { | |
42 if (clock_return == 0) { | |
43 if (res.tv_sec > 1 || res.tv_nsec > 100) { | |
44 printf("FAIL: clock_getres returned bad clock re
solution\n"); | |
45 return EXIT_FAILURE; | |
46 } else { | |
47 printf("PASS: check successful\n"); | |
48 return EXIT_SUCCESS; | |
49 } | |
50 } else { | |
51 printf("FAIL: clock_getres failed\n"); | |
52 return EXIT_FAILURE; | |
53 } | |
54 } else { | |
55 printf("FAIL: invalid clock source: %s\n", clocksource); | |
56 return EXIT_FAILURE; | |
57 } | |
58 } | |
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