1/* 2 * This program is free software; you can redistribute it and/or modify 3 * it under the terms of the GNU General Public License version 2. 4 * 5 * This program is distributed in the hope that it will be useful, 6 * but WITHOUT ANY WARRANTY; without even the implied warranty of 7 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 8 * GNU General Public License for more details. 9 * 10 * 11 * Test that the scheduling policy and scheduling parameters are set for 12 * the calling process when pid == 0. 13 */ 14#include <sched.h> 15#include <stdio.h> 16#include <errno.h> 17#include <unistd.h> 18#include "posixtest.h" 19 20int main(){ 21 int result, new_priority, old_priority, max_prio, policy; 22 struct sched_param param; 23 24 if(sched_getparam(getpid(), ¶m) != 0){ 25 perror("An error occurs when calling sched_getparam()"); 26 return PTS_UNRESOLVED; 27 } 28 29 policy = sched_getscheduler(getpid()); 30 if(policy == -1) { 31 perror("An error occurs when calling sched_getscheduler()"); 32 return PTS_UNRESOLVED; 33 } 34 35 /* Make sure new_priority != old_priority */ 36 max_prio = sched_get_priority_max(policy); 37 old_priority = param.sched_priority; 38 new_priority = (old_priority == max_prio) ? 39 sched_get_priority_min(policy) : 40 max_prio; 41 param.sched_priority = new_priority; 42 43 result = sched_setparam(0, ¶m); 44 45 if(sched_getparam(getpid(), ¶m) != 0){ 46 perror("An error occurs when calling sched_getparam()"); 47 return PTS_UNRESOLVED; 48 } 49 50 if(result == 0 && param.sched_priority == new_priority) { 51 printf("Test PASSED\n"); 52 return PTS_PASS; 53 } else if(result == 0 && param.sched_priority == old_priority) { 54 printf("The param does not change\n"); 55 return PTS_FAIL; 56 } else if(result == -1 && errno == EPERM) { 57 printf("The process have not permission to change its own param.\n"); 58 return PTS_UNRESOLVED; 59 } 60 61 perror("Unknow error"); 62 return PTS_FAIL; 63} 64