| /* |
| * |
| * 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 |
| * shmt07 |
| * |
| * CALLS |
| * shmctl(2) shmget(2) shmat(2) |
| * |
| * ALGORITHM |
| * Create and attach a shared memory segment, write to it |
| * and then fork a child. The child Verifies that the shared memory segment |
| * that it inherited from the parent conatins the same data that was originally |
| * written to it by the parent. |
| * |
| */ |
| |
| #include <stdio.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <sys/ipc.h> |
| #include <sys/shm.h> |
| #include <sys/utsname.h> |
| #include <errno.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| |
| #define SIZE 16*1024 |
| |
| /** LTP Port **/ |
| #include "test.h" |
| |
| char *TCID = "shmt07"; /* Test program identifier. */ |
| int TST_TOTAL = 2; /* Total number of test cases. */ |
| /**************/ |
| |
| int child(); |
| int rm_shm(int); |
| |
| int main() |
| { |
| char *cp = NULL; |
| int shmid, pid, status; |
| key_t key; |
| |
| key = (key_t) getpid(); |
| |
| /*---------------------------------------------------------*/ |
| |
| errno = 0; |
| |
| if ((shmid = shmget(key, SIZE, IPC_CREAT | 0666)) < 0) { |
| perror("shmget"); |
| tst_brkm(TFAIL, NULL, |
| "Error: shmget: shmid = %d, errno = %d\n", |
| shmid, errno); |
| } |
| cp = shmat(shmid, NULL, 0); |
| |
| if (cp == (char *)-1) { |
| perror("shmat"); |
| tst_resm(TFAIL, |
| "Error: shmat: shmid = %d, errno = %d\n", |
| shmid, errno); |
| rm_shm(shmid); |
| tst_exit(); |
| } |
| |
| *cp = '1'; |
| *(cp + 1) = '2'; |
| |
| tst_resm(TPASS, "shmget,shmat"); |
| |
| /*-------------------------------------------------------*/ |
| |
| pid = fork(); |
| switch (pid) { |
| case -1: |
| tst_brkm(TBROK, NULL, "fork failed"); |
| |
| case 0: |
| if (*cp != '1') { |
| tst_resm(TFAIL, "Error: not 1\n"); |
| } |
| if (*(cp + 1) != '2') { |
| tst_resm(TFAIL, "Error: not 2\n"); |
| } |
| tst_exit(); |
| } |
| |
| /* parent */ |
| while (wait(&status) < 0 && errno == EINTR) ; |
| |
| tst_resm(TPASS, "cp & cp+1 correct"); |
| |
| /*-----------------------------------------------------------*/ |
| rm_shm(shmid); |
| 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); |
| } |