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 policy and scheduling parameters remain unchanged when no 12 * process can be found corresponding to that specified by pid. 13 * 14 * The test create a child process which exit immediately and call 15 * sched_setscheduler with the pid of defunct child. 16 * Steps: 17 * 1. Get the old policy and priority. 18 * 2. Create a child process which exit immediately. 19 * 3. Wait for child to exit. 20 * 4. Call sched_setscheduler with the pid of defunct child. 21 * 5. Check that the policy and priority have not changed. 22 */ 23 #include <sched.h> 24 #include <stdio.h> 25 #include <errno.h> 26 #include <unistd.h> 27 #include <stdlib.h> 28 #include <sys/wait.h> 29 #include "posixtest.h" 30 31 int main(void) 32 { 33 int max_priority, old_priority, old_policy, new_policy, policy; 34 int child_pid, stat_loc; 35 struct sched_param param; 36 37 if (sched_getparam(getpid(), ¶m) == -1) { 38 perror("An error occurs when calling sched_getparam()"); 39 return PTS_UNRESOLVED; 40 } 41 old_priority = param.sched_priority; 42 43 old_policy = sched_getscheduler(getpid()); 44 if (old_policy == -1) { 45 perror("An error occurs when calling sched_getscheduler()"); 46 return PTS_UNRESOLVED; 47 } 48 49 /* Make sure that policy != old_policy */ 50 policy = old_policy == SCHED_FIFO ? SCHED_RR : SCHED_FIFO; 51 52 /* Make sure that param.sched_priority != old_priority */ 53 max_priority = sched_get_priority_max(policy); 54 param.sched_priority = (old_priority == max_priority) ? 55 sched_get_priority_min(policy) : max_priority; 56 57 /* Create a child process which exit immediately */ 58 child_pid = fork(); 59 if (child_pid == -1) { 60 perror("An error occurs when calling fork()"); 61 return PTS_UNRESOLVED; 62 } else if (child_pid == 0) { 63 exit(0); 64 } 65 66 /* Wait for the child process to exit */ 67 if (wait(&stat_loc) == -1) { 68 perror("An error occurs when calling wait()"); 69 return PTS_UNRESOLVED; 70 } 71 72 /* Assume the pid is not yet reatributed to an other process */ 73 sched_setscheduler(child_pid, policy, ¶m); 74 75 if (sched_getparam(getpid(), ¶m) != 0) { 76 perror("An error occurs when calling sched_getparam()"); 77 return PTS_UNRESOLVED; 78 } 79 80 new_policy = sched_getscheduler(getpid()); 81 if (new_policy == -1) { 82 perror("An error occurs when calling sched_getscheduler()"); 83 return PTS_UNRESOLVED; 84 } 85 86 if (old_policy == new_policy && old_priority == param.sched_priority) { 87 printf("Test PASSED\n"); 88 return PTS_PASS; 89 } 90 91 if (param.sched_priority != old_priority) { 92 printf("The param has changed\n"); 93 } 94 if (new_policy != old_policy) { 95 printf("The policy has changed\n"); 96 } 97 return PTS_FAIL; 98 } 99
