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 sched_setparam() sets the scheduling parameters to the parameters 12 * specified in the sched_param structure pointed to by param. 13 */ 14 15#include <sched.h> 16#include <stdio.h> 17#include <signal.h> 18#include <errno.h> 19#include <unistd.h> 20#include <stdlib.h> 21#include "posixtest.h" 22 23 24void child_proc(){ 25 sigset_t sigset; 26 int sig; 27 28 if(sigemptyset(&sigset) != 0) { 29 perror("An error occurs when calling sigemptyset()"); 30 exit(1); 31 } 32 if(sigaddset(&sigset,SIGUSR1) != 0) { 33 perror("An error occurs when calling sigaddset()"); 34 exit(1); 35 } 36 if(sigwait(&sigset, &sig) != 0) { 37 perror("An error occurs when calling sigwait()"); 38 exit(1); 39 } 40 41 exit(0); 42} 43 44 45int main(){ 46 int result, child_pid, tmp_errno, policy; 47 int min_priority, new_priority, old_priority; 48 struct sched_param param; 49 50 /* Create a child process which wait SIGUSR1 */ 51 child_pid = fork(); 52 if(child_pid == -1){ 53 perror("An error occurs when calling fork()"); 54 return PTS_UNRESOLVED; 55 } else if (child_pid == 0){ 56 child_proc(); 57 } 58 59 if(sched_getparam(child_pid, ¶m) != 0){ 60 perror("An error occurs when calling sched_getparam()"); 61 kill(child_pid, SIGUSR1); 62 return PTS_UNRESOLVED; 63 } 64 65 /* Assume that the process have permission to change priority of 66 its child */ 67 old_priority = param.sched_priority; 68 69 policy = sched_getscheduler(0); 70 if(policy == -1) { 71 perror("An error occurs when calling sched_getscheduler()"); 72 return PTS_UNRESOLVED; 73 } 74 min_priority = sched_get_priority_min(policy); 75 76 new_priority = param.sched_priority == min_priority ? 77 (param.sched_priority = sched_get_priority_max(policy)) : 78 (param.sched_priority = min_priority); 79 80 81 result = sched_setparam(child_pid, ¶m); 82 tmp_errno = errno; 83 84 if(sched_getparam(child_pid, ¶m) != 0){ 85 perror("An error occurs when calling sched_getparam()"); 86 kill(child_pid, SIGUSR1); 87 return PTS_UNRESOLVED; 88 } 89 90 if(result == 0 && param.sched_priority == new_priority) { 91 printf("Test PASSED\n"); 92 kill(child_pid, SIGUSR1); 93 return PTS_PASS; 94 } else if(result == 0 && param.sched_priority == old_priority) { 95 printf("The param does not change.\n"); 96 kill(child_pid, SIGUSR1); 97 return PTS_FAIL; 98 } else if(result == -1 && tmp_errno == EPERM) { 99 printf("The process have not permission to change the param of its child.\n"); 100 kill(child_pid, SIGUSR1); 101 return PTS_UNRESOLVED; 102 } else if(result == -1 && tmp_errno == EINVAL) { 103 /* the new priority may be to big */ 104 /* test with a new priority lower than the old one */ 105 param.sched_priority = (new_priority -= 2); 106 result = sched_setparam(child_pid, ¶m); 107 108 if(result == 0 && param.sched_priority == new_priority) { 109 printf("Test PASSED"); 110 kill(child_pid, SIGUSR1); 111 return PTS_PASS; 112 } 113 } 114 115 perror("Unknow error"); 116 kill(child_pid, SIGUSR1); 117 return PTS_FAIL; 118} 119