| /* |
| * |
| * Copyright (c) International Business Machines Corp., 2002 |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * 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. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /* 12/20/2002 Port to LTP robbiew@us.ibm.com */ |
| /* 06/30/2001 Port to Linux nsharoff@us.ibm.com */ |
| |
| /* |
| * NAME |
| * shmt3 |
| * |
| * CALLS |
| * shmctl(2) shmget(2) shmat(2) |
| * |
| * ALGORITHM |
| * Create one shared memory segment and attach it twice to the same process, |
| * at an address that is chosen by the system. After the first attach has |
| * completed, write to it and then do the second attach. |
| * Verify that the doubly attached segment contains the same data. |
| * |
| */ |
| |
| #include <stdio.h> |
| #include <sys/types.h> |
| #include <sys/ipc.h> |
| #include <sys/shm.h> |
| #include <errno.h> |
| |
| /** LTP Port **/ |
| #include "test.h" |
| |
| char *TCID = "shmt03"; /* Test program identifier. */ |
| int TST_TOTAL = 4; /* Total number of test cases. */ |
| /**************/ |
| |
| #define K_1 1024 |
| #define SUCCESSFUL 1 |
| |
| int first_attach, second_attach; |
| int rm_shm(int); |
| |
| int main() |
| { |
| char *cp1, *cp2; |
| int shmid; |
| key_t key; |
| |
| key = (key_t) getpid(); |
| errno = 0; |
| |
| /*------------------------------------------------------------*/ |
| |
| if ((shmid = shmget(key, 16 * K_1, IPC_CREAT | 0666)) < 0) { |
| perror("shmget"); |
| tst_brkm(TFAIL, NULL, |
| "shmget Failed: shmid = %d, errno = %d\n", |
| shmid, errno); |
| } |
| |
| tst_resm(TPASS, "shmget"); |
| |
| /*------------------------------------------------------------*/ |
| |
| if ((cp1 = shmat(shmid, NULL, 0)) == (char *)-1) { |
| perror("shmat"); |
| tst_resm(TFAIL, "shmat Failed: shmid = %d, errno = %d\n", |
| shmid, errno); |
| } else { |
| *cp1 = '1'; |
| *(cp1 + 5 * K_1) = '2'; |
| first_attach = SUCCESSFUL; |
| } |
| |
| tst_resm(TPASS, "1st shmat"); |
| |
| /*------------------------------------------------------------*/ |
| |
| if ((cp2 = shmat(shmid, NULL, 0)) == (char *)-1) { |
| perror("shmat"); |
| tst_resm(TFAIL, "shmat Failed: shmid = %d, errno = %d\n", |
| shmid, errno); |
| } else { |
| second_attach = SUCCESSFUL; |
| if ((*cp2 != '1' || *(cp2 + 5 * K_1) != '2') && |
| first_attach == SUCCESSFUL) { |
| tst_resm(TFAIL, "Error: Shared memory contents\n"); |
| } |
| } |
| |
| tst_resm(TPASS, "2nd shmat"); |
| |
| /*---------------------------------------------------------------*/ |
| |
| rm_shm(shmid); |
| |
| if (first_attach && second_attach) { |
| if (*cp2 != '1' || *(cp2 + 5 * K_1) != '2' || |
| *cp1 != '1' || *(cp1 + 5 * K_1) != '2') { |
| tst_resm(TFAIL, "Error: Shared memory contents\n"); |
| } |
| } |
| |
| tst_resm(TPASS, "Correct shared memory contents"); |
| /*-----------------------------------------------------------------*/ |
| tst_exit(); |
| } |
| |
| int rm_shm(shmid) |
| int shmid; |
| { |
| if (shmctl(shmid, IPC_RMID, NULL) == -1) { |
| perror("shmctl"); |
| tst_brkm(TFAIL, |
| NULL, |
| "shmctl Failed to remove: shmid = %d, errno = %d\n", |
| shmid, errno); |
| } |
| return (0); |
| } |