| /* |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * |
| * Test that sched_setparam() sets the scheduling parameters to the parameters |
| * specified in the sched_param structure pointed to by param. |
| */ |
| |
| #include <sched.h> |
| #include <stdio.h> |
| #include <signal.h> |
| #include <errno.h> |
| #include <unistd.h> |
| #include <stdlib.h> |
| #include "posixtest.h" |
| |
| void child_proc() { |
| sigset_t sigset; |
| int sig; |
| |
| if (sigemptyset(&sigset) != 0) { |
| perror("An error occurs when calling sigemptyset()"); |
| exit(1); |
| } |
| if (sigaddset(&sigset,SIGUSR1) != 0) { |
| perror("An error occurs when calling sigaddset()"); |
| exit(1); |
| } |
| if (sigwait(&sigset, &sig) != 0) { |
| perror("An error occurs when calling sigwait()"); |
| exit(1); |
| } |
| |
| exit(0); |
| } |
| |
| int main() { |
| int result, child_pid, tmp_errno, policy; |
| int min_priority, new_priority, old_priority; |
| struct sched_param param; |
| |
| /* Create a child process which wait SIGUSR1 */ |
| child_pid = fork(); |
| if (child_pid == -1) { |
| perror("An error occurs when calling fork()"); |
| return PTS_UNRESOLVED; |
| } else if (child_pid == 0) { |
| child_proc(); |
| } |
| |
| if (sched_getparam(child_pid, ¶m) != 0) { |
| perror("An error occurs when calling sched_getparam()"); |
| kill(child_pid, SIGUSR1); |
| return PTS_UNRESOLVED; |
| } |
| |
| /* Assume that the process have permission to change priority of |
| its child */ |
| old_priority = param.sched_priority; |
| |
| policy = sched_getscheduler(0); |
| if (policy == -1) { |
| perror("An error occurs when calling sched_getscheduler()"); |
| return PTS_UNRESOLVED; |
| } |
| min_priority = sched_get_priority_min(policy); |
| |
| new_priority = param.sched_priority == min_priority ? |
| (param.sched_priority = sched_get_priority_max(policy)) : |
| (param.sched_priority = min_priority); |
| |
| result = sched_setparam(child_pid, ¶m); |
| tmp_errno = errno; |
| |
| if (sched_getparam(child_pid, ¶m) != 0) { |
| perror("An error occurs when calling sched_getparam()"); |
| kill(child_pid, SIGUSR1); |
| return PTS_UNRESOLVED; |
| } |
| |
| if (result == 0 && param.sched_priority == new_priority) { |
| printf("Test PASSED\n"); |
| kill(child_pid, SIGUSR1); |
| return PTS_PASS; |
| } else if (result == 0 && param.sched_priority == old_priority) { |
| printf("The param does not change.\n"); |
| kill(child_pid, SIGUSR1); |
| return PTS_FAIL; |
| } else if (result == -1 && tmp_errno == EPERM) { |
| printf("The process have not permission to change the param of its child.\n"); |
| kill(child_pid, SIGUSR1); |
| return PTS_UNRESOLVED; |
| } else if (result == -1 && tmp_errno == EINVAL) { |
| /* the new priority may be to big */ |
| /* test with a new priority lower than the old one */ |
| param.sched_priority = (new_priority -= 2); |
| result = sched_setparam(child_pid, ¶m); |
| |
| if (result == 0 && param.sched_priority == new_priority) { |
| printf("Test PASSED"); |
| kill(child_pid, SIGUSR1); |
| return PTS_PASS; |
| } |
| } |
| |
| perror("Unknow error"); |
| kill(child_pid, SIGUSR1); |
| return PTS_FAIL; |
| } |