| /* |
| * 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 the policy and scheduling parameters remain unchanged when the |
| * requesting process does not have permission to set the scheduling parameters |
| * for the specified process, or does not have the appropriate privilege to |
| * invoke sched_setscheduler(). |
| * |
| * Atempt to change the policy of the process whose ID is 1 which is generally |
| * belongs to root. This test can not be run by root. |
| * Steps: |
| * 1. Get the old policy and priority. |
| * 2. Call sched_setscheduler with pid arg == 1. |
| * 3. Check that the policy and priority have not changed. |
| */ |
| #include <sched.h> |
| #include <stdio.h> |
| #include <errno.h> |
| #include <unistd.h> |
| #include <pwd.h> |
| #include <string.h> |
| #include "posixtest.h" |
| |
| /** Set the euid of this process to a non-root uid */ |
| int set_nonroot() |
| { |
| struct passwd *pw; |
| setpwent(); |
| /* search for the first user which is non root */ |
| while ((pw = getpwent()) != NULL) |
| if (strcmp(pw->pw_name, "root")) |
| break; |
| endpwent(); |
| if (pw == NULL) { |
| printf("There is no other user than current and root.\n"); |
| return 1; |
| } |
| |
| if (seteuid(pw->pw_uid) != 0) { |
| if (errno == EPERM) { |
| printf("You don't have permission to change your UID.\n"); |
| return 1; |
| } |
| perror("An error occurs when calling seteuid()"); |
| return 1; |
| } |
| |
| printf("Testing with user '%s' (uid: %d)\n", |
| pw->pw_name, (int)geteuid()); |
| return 0; |
| } |
| |
| int main() { |
| int max_priority, old_priority, old_policy, new_policy, policy; |
| struct sched_param param; |
| |
| /* We assume process Number 1 is created by root */ |
| /* and can only be accessed by root */ |
| /* This test should be run under standard user permissions */ |
| if (getuid() == 0) { |
| if (set_nonroot() != 0) { |
| printf("Cannot run this test as non-root user\n"); |
| return PTS_UNTESTED; |
| } |
| } |
| |
| if (sched_getparam(getpid(), ¶m) == -1) { |
| perror("An error occurs when calling sched_getparam()"); |
| return PTS_UNRESOLVED; |
| } |
| old_priority = param.sched_priority; |
| |
| old_policy = sched_getscheduler(getpid()); |
| if (old_policy == -1) { |
| perror("An error occurs when calling sched_getscheduler()"); |
| return PTS_UNRESOLVED; |
| } |
| |
| /* Make sure that policy != old_policy */ |
| policy = old_policy == SCHED_FIFO ? SCHED_RR : SCHED_FIFO; |
| |
| /* Make sure that param.sched_priority != old_priority */ |
| max_priority = sched_get_priority_max(policy); |
| param.sched_priority = (old_priority == max_priority) ? |
| sched_get_priority_min(policy) : |
| max_priority; |
| |
| sched_setscheduler(1, policy, ¶m); |
| |
| if (sched_getparam(getpid(), ¶m) != 0) { |
| perror("An error occurs when calling sched_getparam()"); |
| return PTS_UNRESOLVED; |
| } |
| |
| new_policy = sched_getscheduler(getpid()); |
| if (new_policy == -1) { |
| perror("An error occurs when calling sched_getscheduler()"); |
| return PTS_UNRESOLVED; |
| } |
| |
| if (old_policy == new_policy && |
| old_priority == param.sched_priority) { |
| printf("Test PASSED\n"); |
| return PTS_PASS; |
| } |
| |
| if (param.sched_priority != old_priority) { |
| printf("The param has changed\n"); |
| } |
| if (new_policy != old_policy) { |
| printf("The policy has changed\n"); |
| } |
| return PTS_FAIL; |
| } |