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 errno == EPERM when the requesting process 12 * does not have permission to set the scheduling parameters for the specified 13 * process, or does not have the appropriate privilege to invoke schedparam(). 14 */ 15 #include <sched.h> 16 #include <stdio.h> 17 #include <errno.h> 18 #include <unistd.h> 19 #include <pwd.h> 20 #include <string.h> 21 #include "posixtest.h" 22 23 /** Set the euid of this process to a non-root uid */ 24 int set_nonroot() 25 { 26 struct passwd *pw; 27 setpwent(); 28 /* search for the first user which is non root */ 29 while ((pw = getpwent()) != NULL) 30 if (strcmp(pw->pw_name, "root")) 31 break; 32 endpwent(); 33 if (pw == NULL) { 34 printf("There is no other user than current and root.\n"); 35 return 1; 36 } 37 38 if (seteuid(pw->pw_uid) != 0) { 39 if (errno == EPERM) { 40 printf 41 ("You don't have permission to change your UID.\n"); 42 return 1; 43 } 44 perror("An error occurs when calling seteuid()"); 45 return 1; 46 } 47 48 printf("Testing with user '%s' (uid: %d)\n", 49 pw->pw_name, (int)geteuid()); 50 return 0; 51 } 52 53 int main(void) 54 { 55 int result; 56 struct sched_param param; 57 58 /* We assume process Number 1 is created by root */ 59 /* and can only be accessed by root */ 60 /* This test should be run under standard user permissions */ 61 if (getuid() == 0) { 62 if (set_nonroot() != 0) { 63 printf("Cannot run this test as non-root user\n"); 64 return PTS_UNTESTED; 65 } 66 } 67 68 if (sched_getparam(0, ¶m) == -1) { 69 perror("An error occurs when calling sched_getparam()"); 70 return PTS_UNRESOLVED; 71 } 72 73 result = sched_setparam(1, ¶m); 74 75 if (result == -1 && errno == EPERM) { 76 printf("Test PASSED\n"); 77 return PTS_PASS; 78 } else if (errno != EPERM) { 79 perror("errno is not EPERM"); 80 return PTS_FAIL; 81 } else { 82 printf("The returned code is not -1.\n"); 83 return PTS_FAIL; 84 } 85 } 86
