169 lines
3.5 KiB
C
169 lines
3.5 KiB
C
/* Clocksource change test
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* by: john stultz (johnstul@us.ibm.com)
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* (C) Copyright IBM 2012
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* Licensed under the GPLv2
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*
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* NOTE: This is a meta-test which quickly changes the clocksource and
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* then uses other tests to detect problems. Thus this test requires
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* that the inconsistency-check and nanosleep tests be present in the
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* same directory it is run from.
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*
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* To build:
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* $ gcc clocksource-switch.c -o clocksource-switch -lrt
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/time.h>
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#include <sys/timex.h>
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#include <time.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <string.h>
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#include <sys/wait.h>
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#include "../kselftest.h"
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int get_clocksources(char list[][30])
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{
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int fd, i;
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size_t size;
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char buf[512];
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char *head, *tmp;
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fd = open("/sys/devices/system/clocksource/clocksource0/available_clocksource", O_RDONLY);
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size = read(fd, buf, 512);
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close(fd);
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for (i = 0; i < 10; i++)
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list[i][0] = '\0';
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head = buf;
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i = 0;
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while (head - buf < size) {
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/* Find the next space */
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for (tmp = head; *tmp != ' '; tmp++) {
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if (*tmp == '\n')
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break;
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if (*tmp == '\0')
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break;
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}
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*tmp = '\0';
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strcpy(list[i], head);
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head = tmp + 1;
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i++;
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}
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return i-1;
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}
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int get_cur_clocksource(char *buf, size_t size)
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{
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int fd;
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fd = open("/sys/devices/system/clocksource/clocksource0/current_clocksource", O_RDONLY);
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size = read(fd, buf, size);
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return 0;
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}
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int change_clocksource(char *clocksource)
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{
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int fd;
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ssize_t size;
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fd = open("/sys/devices/system/clocksource/clocksource0/current_clocksource", O_WRONLY);
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if (fd < 0)
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return -1;
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size = write(fd, clocksource, strlen(clocksource));
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if (size < 0)
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return -1;
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close(fd);
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return 0;
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}
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int run_tests(int secs)
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{
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int ret;
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char buf[255];
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sprintf(buf, "./inconsistency-check -t %i", secs);
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ret = system(buf);
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if (WIFEXITED(ret) && WEXITSTATUS(ret))
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return WEXITSTATUS(ret);
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ret = system("./nanosleep");
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return WIFEXITED(ret) ? WEXITSTATUS(ret) : 0;
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}
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char clocksource_list[10][30];
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int main(int argv, char **argc)
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{
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char orig_clk[512];
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int count, i, status;
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pid_t pid;
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get_cur_clocksource(orig_clk, 512);
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count = get_clocksources(clocksource_list);
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if (change_clocksource(clocksource_list[0])) {
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printf("Error: You probably need to run this as root\n");
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return -1;
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}
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/* Check everything is sane before we start switching asynchronously */
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for (i = 0; i < count; i++) {
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printf("Validating clocksource %s\n", clocksource_list[i]);
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if (change_clocksource(clocksource_list[i])) {
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status = -1;
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goto out;
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}
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if (run_tests(5)) {
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status = -1;
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goto out;
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}
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}
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printf("Running Asynchronous Switching Tests...\n");
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pid = fork();
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if (!pid)
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return run_tests(60);
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while (pid != waitpid(pid, &status, WNOHANG))
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for (i = 0; i < count; i++)
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if (change_clocksource(clocksource_list[i])) {
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status = -1;
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goto out;
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}
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out:
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change_clocksource(orig_clk);
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if (status)
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return ksft_exit_fail();
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return ksft_exit_pass();
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}
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