1 /* 2 * 3 * Copyright (c) International Business Machines Corp., 2001 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 13 * the GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 18 */ 19 20 /* 21 * NAME 22 * semget05.c 23 * 24 * DESCRIPTION 25 * semget05 - test for ENOSPC error 26 * 27 * ALGORITHM 28 * create semaphore sets in a loop until the system limit is reached 29 * loop if that option was specified 30 * attempt to create yet another semaphore set 31 * check the errno value 32 * issue a PASS message if we get ENOSPC 33 * otherwise, the tests fails 34 * issue a FAIL message 35 * call cleanup 36 * 37 * USAGE: <for command-line> 38 * HISTORY 39 * 03/2001 - Written by Wayne Boyer 40 * 07/2006 - Changes By Michael Reed 41 * - Changed the value of MAXIDS for the specific machine by reading 42 * the system limit for SEMMNI - The maximum number of sempahore sets 43 * 03/2008 - Matthieu Fertr (mfertre (at) irisa.fr) 44 * - Fix concurrency issue. Create private semaphores to 45 * avoid conflict with concurrent processes. 46 * 47 * RESTRICTIONS 48 * none 49 */ 50 51 #include "../lib/ipcsem.h" 52 53 char *TCID = "semget05"; 54 int TST_TOTAL = 1; 55 56 /* 57 * The MAXIDS value is somewhat arbitrary and may need to be increased 58 * depending on the system being tested. 59 */ 60 61 int MAXIDS = 2048; 62 63 int *sem_id_arr = NULL; 64 int num_sems = 0; /* count the semaphores created */ 65 66 int main(int ac, char **av) 67 { 68 int lc; 69 FILE *fp; 70 71 tst_parse_opts(ac, av, NULL, NULL); 72 73 /* Set the MAXIDS for the specific machine by reading the system limit 74 * for SEMMNI - The maximum number of sempahore sets 75 */ 76 fp = fopen("/proc/sys/kernel/sem", "r"); 77 if (fp != NULL) { 78 int getmaxid; 79 if (fscanf(fp, "%*d %*d %*d %d", &getmaxid) == 1) 80 MAXIDS = getmaxid + 1; 81 fclose(fp); 82 } 83 84 sem_id_arr = malloc(sizeof(int) * MAXIDS); 85 if (sem_id_arr == NULL) 86 tst_brkm(TBROK, cleanup, "malloc failed"); 87 88 setup(); 89 90 for (lc = 0; TEST_LOOPING(lc); lc++) { 91 tst_count = 0; 92 93 94 TEST(semget(IPC_PRIVATE, PSEMS, IPC_CREAT | IPC_EXCL | SEM_RA)); 95 if (TEST_RETURN != -1) { 96 tst_resm(TFAIL, "call succeeded when error expected"); 97 continue; 98 } 99 100 switch (TEST_ERRNO) { 101 case ENOSPC: 102 tst_resm(TPASS, "expected failure - errno " 103 "= %d : %s", TEST_ERRNO, strerror(TEST_ERRNO)); 104 break; 105 default: 106 tst_resm(TFAIL, "unexpected error - %d : %s", 107 TEST_ERRNO, strerror(TEST_ERRNO)); 108 break; 109 } 110 } 111 112 cleanup(); 113 114 tst_exit(); 115 } 116 117 void setup(void) 118 { 119 int sem_q; 120 121 tst_sig(NOFORK, DEF_HANDLER, cleanup); 122 123 TEST_PAUSE; 124 125 tst_tmpdir(); 126 127 while ((sem_q = semget(IPC_PRIVATE, PSEMS, IPC_CREAT | IPC_EXCL)) != -1) { 128 sem_id_arr[num_sems++] = sem_q; 129 if (num_sems == MAXIDS) { 130 tst_brkm(TBROK, cleanup, "The maximum number of " 131 "semaphore ID's has been\n\t reached. Please " 132 "increase the MAXIDS value in the test."); 133 } 134 } 135 136 if (errno != ENOSPC) { 137 tst_brkm(TBROK, cleanup, "Didn't get ENOSPC in test setup" 138 " - errno = %d : %s", errno, strerror(errno)); 139 } 140 } 141 142 void cleanup(void) 143 { 144 int i; 145 146 for (i = 0; i < num_sems; i++) { 147 rm_sema(sem_id_arr[i]); 148 } 149 150 free(sem_id_arr); 151 tst_rmdir(); 152 } 153
