| /* |
| * Test clock resolution for KVM guests that have kvm-clock as clock source |
| * |
| * Copyright (c) 2010 Red Hat, Inc |
| * Author: Lucas Meneghel Rodrigues <lmr@redhat.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, see <http://www.gnu.org/licenses/>. |
| */ |
| #include <stdio.h> |
| #include <time.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| int main(void) { |
| struct timespec res; |
| int clock_return = clock_getres(CLOCK_MONOTONIC, &res); |
| char clocksource[50]; |
| char line[80]; |
| FILE *fr; |
| if ((fr = fopen( |
| "/sys/devices/system/clocksource/clocksource0/current_clocksource", |
| "rt")) == NULL) { |
| perror("fopen"); |
| return EXIT_FAILURE; |
| } |
| while (fgets(line, 80, fr) != NULL) { |
| sscanf(line, "%s", &clocksource); |
| } |
| fclose(fr); |
| if (!strncmp(clocksource, "kvm-clock", strlen("kvm-clock"))) { |
| if (clock_return == 0) { |
| if (res.tv_sec > 1 || res.tv_nsec > 100) { |
| printf("FAIL: clock_getres returned bad clock resolution\n"); |
| return EXIT_FAILURE; |
| } else { |
| printf("PASS: check successful\n"); |
| return EXIT_SUCCESS; |
| } |
| } else { |
| printf("FAIL: clock_getres failed\n"); |
| return EXIT_FAILURE; |
| } |
| } else { |
| printf("FAIL: invalid clock source: %s\n", clocksource); |
| return EXIT_FAILURE; |
| } |
| } |