1 /* 2 * 3 * Copyright (c) International Business Machines Corp., 2002 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 /* 12/20/2002 Port to LTP robbiew (at) us.ibm.com */ 21 /* 06/30/2001 Port to Linux nsharoff (at) us.ibm.com */ 22 23 /* 24 * NAME 25 * shmt3 26 * 27 * CALLS 28 * shmctl(2) shmget(2) shmat(2) 29 * 30 * ALGORITHM 31 * Create one shared memory segment and attach it twice to the same process, 32 * at an address that is chosen by the system. After the first attach has 33 * completed, write to it and then do the second attach. 34 * Verify that the doubly attached segment contains the same data. 35 * 36 */ 37 38 #include <stdio.h> 39 #include <sys/types.h> 40 #include <sys/ipc.h> 41 #include <sys/shm.h> 42 #include <errno.h> 43 44 /** LTP Port **/ 45 #include "test.h" 46 47 char *TCID = "shmt03"; /* Test program identifier. */ 48 int TST_TOTAL = 4; /* Total number of test cases. */ 49 /**************/ 50 51 #define K_1 1024 52 #define SUCCESSFUL 1 53 54 int first_attach, second_attach; 55 static int rm_shm(int); 56 57 int main(void) 58 { 59 char *cp1, *cp2; 60 int shmid; 61 key_t key; 62 63 key = (key_t) getpid(); 64 errno = 0; 65 66 /*------------------------------------------------------------*/ 67 68 if ((shmid = shmget(key, 16 * K_1, IPC_CREAT | 0666)) < 0) { 69 perror("shmget"); 70 tst_brkm(TFAIL, NULL, 71 "shmget Failed: shmid = %d, errno = %d\n", 72 shmid, errno); 73 } 74 75 tst_resm(TPASS, "shmget"); 76 77 /*------------------------------------------------------------*/ 78 79 if ((cp1 = shmat(shmid, NULL, 0)) == (char *)-1) { 80 perror("shmat"); 81 tst_resm(TFAIL, "shmat Failed: shmid = %d, errno = %d\n", 82 shmid, errno); 83 } else { 84 *cp1 = '1'; 85 *(cp1 + 5 * K_1) = '2'; 86 first_attach = SUCCESSFUL; 87 } 88 89 tst_resm(TPASS, "1st shmat"); 90 91 /*------------------------------------------------------------*/ 92 93 if ((cp2 = shmat(shmid, NULL, 0)) == (char *)-1) { 94 perror("shmat"); 95 tst_resm(TFAIL, "shmat Failed: shmid = %d, errno = %d\n", 96 shmid, errno); 97 } else { 98 second_attach = SUCCESSFUL; 99 if ((*cp2 != '1' || *(cp2 + 5 * K_1) != '2') && 100 first_attach == SUCCESSFUL) { 101 tst_resm(TFAIL, "Error: Shared memory contents\n"); 102 } 103 } 104 105 tst_resm(TPASS, "2nd shmat"); 106 107 /*---------------------------------------------------------------*/ 108 109 rm_shm(shmid); 110 111 if (first_attach && second_attach) { 112 if (*cp2 != '1' || *(cp2 + 5 * K_1) != '2' || 113 *cp1 != '1' || *(cp1 + 5 * K_1) != '2') { 114 tst_resm(TFAIL, "Error: Shared memory contents\n"); 115 } 116 } 117 118 tst_resm(TPASS, "Correct shared memory contents"); 119 /*-----------------------------------------------------------------*/ 120 tst_exit(); 121 } 122 123 static int rm_shm(int shmid) 124 { 125 if (shmctl(shmid, IPC_RMID, NULL) == -1) { 126 perror("shmctl"); 127 tst_brkm(TFAIL, 128 NULL, 129 "shmctl Failed to remove: shmid = %d, errno = %d\n", 130 shmid, errno); 131 } 132 return (0); 133 } 134
