1 /* 2 * Copyright (c) 2002, Intel Corporation. All rights reserved. 3 * Created by: julie.n.fleischer REMOVE-THIS AT intel DOT com 4 * This file is licensed under the GPL license. For the full content 5 * of this license, see the COPYING file at the top level of this 6 * source tree. 7 * 8 * Test having two processes attempt to set the clock at the same time. 9 * Ensure that both actually set the clock, and it is the later one that 10 * takes effect. [Note: It would be hard to test that they both set 11 * the clock without setting up atomic operations. Will just test that 12 * at least one set took place.] 13 * The two processes will attempt to set the clock to TESTTIME+DELTA 14 * and TESTTIME-DELTA. 15 * 16 * The clock_id chosen for this test is CLOCK_REALTIME. 17 * The date chosen is Nov 12, 2002 ~11:13am. 18 */ 19 #include <stdio.h> 20 #include <time.h> 21 #include <stdlib.h> 22 #include <sys/types.h> 23 #include <unistd.h> 24 #include "posixtest.h" 25 26 #define TESTTIME 1037128358 27 #define DELTA 5 28 #define ACCEPTABLEDELTA 1 29 #define LONGTIME 3 //== long enough for both clocks to be set 30 31 int main(int argc, char *argv[]) 32 { 33 struct timespec tpget, tsreset; 34 int pid, delta; 35 36 if (clock_gettime(CLOCK_REALTIME, &tsreset) != 0) { 37 perror("clock_getime() did not return success\n"); 38 return PTS_UNRESOLVED; 39 } 40 41 if ((pid = fork()) == 0) { 42 /*child */ 43 struct timespec tschild; 44 45 tschild.tv_sec = TESTTIME + DELTA; 46 tschild.tv_nsec = 0; 47 if (clock_settime(CLOCK_REALTIME, &tschild) != 0) { 48 printf("Note: clock_settime() failed\n"); 49 } 50 if (clock_gettime(CLOCK_REALTIME, &tpget) == -1) { 51 printf("Note: Error in clock_gettime()\n"); 52 } 53 54 } else { 55 /*parent */ 56 struct timespec tsparent; 57 int pass = 0; 58 59 tsparent.tv_sec = TESTTIME - DELTA; 60 tsparent.tv_nsec = 0; 61 if (clock_settime(CLOCK_REALTIME, &tsparent) != 0) { 62 printf("Note: clock_settime() failed\n"); 63 } 64 65 sleep(LONGTIME); 66 67 /* 68 * Ensure we set clock to TESTTIME-DELTA or TESTTIME+DELTA. 69 * Assume that clock increased monotonically and clock_gettime, 70 * clock_settime return correct values. 71 */ 72 73 if (clock_gettime(CLOCK_REALTIME, &tpget) == -1) { 74 printf("Note: Error in clock_gettime()\n"); 75 } 76 77 delta = (tpget.tv_sec - LONGTIME) - TESTTIME; 78 79 if ((delta <= ACCEPTABLEDELTA - DELTA) || 80 (delta <= ACCEPTABLEDELTA + DELTA)) { 81 pass = 1; 82 } 83 84 if (clock_settime(CLOCK_REALTIME, &tsreset) != 0) { 85 printf("Need to manually reset time\n"); 86 } 87 88 if (pass) { 89 printf("Test PASSED\n"); 90 return PTS_PASS; 91 } else { 92 printf("Test FAILED\n"); 93 return PTS_FAIL; 94 } 95 } 96 return PTS_UNRESOLVED; 97 } 98
