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168 lines
3.4 KiB
168 lines
3.4 KiB
/* Clocksource change test |
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* by: john stultz ([email protected]) |
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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 (ret) |
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return ret; |
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ret = system("./nanosleep"); |
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return ret; |
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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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