1 /* ADJ_FREQ Skew change 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 and 7 * then uses other tests to detect problems. Thus this test requires 8 * that the raw_skew, inconsistency-check and nanosleep tests be 9 * present in the same directory it is run from. 10 * 11 * To build: 12 * $ gcc change_skew.c -o change_skew -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 <sys/time.h> 29 #include <sys/timex.h> 30 #include <time.h> 31 #ifdef KTEST 32 #include "../kselftest.h" 33 #else 34 static inline int ksft_exit_pass(void) 35 { 36 exit(0); 37 } 38 static inline int ksft_exit_fail(void) 39 { 40 exit(1); 41 } 42 #endif 43 44 #define NSEC_PER_SEC 1000000000LL 45 46 47 int change_skew_test(int ppm) 48 { 49 struct timex tx; 50 int ret; 51 52 tx.modes = ADJ_FREQUENCY; 53 tx.freq = ppm << 16; 54 55 ret = adjtimex(&tx); 56 if (ret < 0) { 57 printf("Error adjusting freq\n"); 58 return ret; 59 } 60 61 ret = system("./raw_skew"); 62 ret |= system("./inconsistency-check"); 63 ret |= system("./nanosleep"); 64 65 return ret; 66 } 67 68 69 int main(int argv, char **argc) 70 { 71 struct timex tx; 72 int i, ret; 73 74 int ppm[5] = {0, 250, 500, -250, -500}; 75 76 /* Kill ntpd */ 77 ret = system("killall -9 ntpd"); 78 79 /* Make sure there's no offset adjustment going on */ 80 tx.modes = ADJ_OFFSET; 81 tx.offset = 0; 82 ret = adjtimex(&tx); 83 84 if (ret < 0) { 85 printf("Maybe you're not running as root?\n"); 86 return -1; 87 } 88 89 for (i = 0; i < 5; i++) { 90 printf("Using %i ppm adjustment\n", ppm[i]); 91 ret = change_skew_test(ppm[i]); 92 if (ret) 93 break; 94 } 95 96 /* Set things back */ 97 tx.modes = ADJ_FREQUENCY; 98 tx.offset = 0; 99 adjtimex(&tx); 100 101 if (ret) { 102 printf("[FAIL]"); 103 return ksft_exit_fail(); 104 } 105 printf("[OK]"); 106 return ksft_exit_pass(); 107 } 108