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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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