1 /* ADJ_FREQ Skew consistency test 2 * by: john stultz (johnstul@us.ibm.com) 3 * (C) Copyright IBM 2012 4 * Licensed under the GPLv2 5 * 6 * NOTE: This is a meta-test which cranks the ADJ_FREQ knob back 7 * and forth and watches for consistency problems. Thus this test requires 8 * that the inconsistency-check tests be present in the same directory it 9 * is run from. 10 * 11 * To build: 12 * $ gcc skew_consistency.c -o skew_consistency -lrt 13 * 14 * This program is free software: you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by 16 * the Free Software Foundation, either version 2 of the License, or 17 * (at your option) any later version. 18 * 19 * This program is distributed in the hope that it will be useful, 20 * but WITHOUT ANY WARRANTY; without even the implied warranty of 21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 22 * GNU General Public License for more details. 23 */ 24 25 26 #include <stdio.h> 27 #include <stdlib.h> 28 #include <unistd.h> 29 #include <sys/time.h> 30 #include <sys/timex.h> 31 #include <time.h> 32 #include <sys/types.h> 33 #include <sys/stat.h> 34 #include <fcntl.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <sys/wait.h> 38 #ifdef KTEST 39 #include "../kselftest.h" 40 #else 41 static inline int ksft_exit_pass(void) 42 { 43 exit(0); 44 } 45 static inline int ksft_exit_fail(void) 46 { 47 exit(1); 48 } 49 #endif 50 51 #define NSEC_PER_SEC 1000000000LL 52 53 int main(int argv, char **argc) 54 { 55 struct timex tx; 56 int ret, ppm; 57 pid_t pid; 58 59 60 printf("Running Asynchronous Frequency Changing Tests...\n"); 61 62 pid = fork(); 63 if (!pid) 64 return system("./inconsistency-check -c 1 -t 600"); 65 66 ppm = 500; 67 ret = 0; 68 69 while (pid != waitpid(pid, &ret, WNOHANG)) { 70 ppm = -ppm; 71 tx.modes = ADJ_FREQUENCY; 72 tx.freq = ppm << 16; 73 adjtimex(&tx); 74 usleep(500000); 75 } 76 77 /* Set things back */ 78 tx.modes = ADJ_FREQUENCY; 79 tx.offset = 0; 80 adjtimex(&tx); 81 82 83 if (ret) { 84 printf("[FAILED]\n"); 85 return ksft_exit_fail(); 86 } 87 printf("[OK]\n"); 88 return ksft_exit_pass(); 89 } 90