/* * * 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 * shmt05 * * CALLS * shmctl(2) shmget(2) shmat(2) * * ALGORITHM * Create two shared memory segments and attach them to the same process * at two different addresses. The addresses DO BUMP into each other. * The second attach should Fail. * */ #include <stdio.h> #include <sys/types.h> #include <sys/ipc.h> #include <sys/shm.h> #include <sys/utsname.h> #include <errno.h> #include <time.h> /** LTP Port **/ #include "test.h" char *TCID = "shmt05"; /* Test program identifier. */ int TST_TOTAL = 2; /* Total number of test cases. */ /**************/ key_t key[2]; #define SIZE (2*SHMLBA) static int rm_shm(int); int main(void) { int shmid, shmid1; char *cp, *cp1; srand48((getpid() << 16) + (unsigned)time(NULL)); key[0] = (key_t) lrand48(); key[1] = (key_t) lrand48(); cp = NULL; cp1 = NULL; /*--------------------------------------------------------*/ if ((shmid = shmget(key[0], SIZE, IPC_CREAT | 0666)) < 0) { perror("shmget"); tst_resm(TFAIL, "Error: shmget: shmid = %d, errno = %d\n", shmid, errno); } else { cp = shmat(shmid, NULL, 0); if (cp == (char *)-1) { tst_resm(TFAIL, "shmat"); rm_shm(shmid); } } tst_resm(TPASS, "shmget & shmat"); /*--------------------------------------------------------*/ if ((shmid1 = shmget(key[1], SIZE, IPC_CREAT | 0666)) < 0) { perror("shmget2"); tst_resm(TFAIL, "Error: shmget: shmid1 = %d, errno = %d\n", shmid1, errno); } else { cp1 = shmat(shmid1, cp + (SIZE / 2), 0); if (cp1 != (char *)-1) { perror("shmat"); tst_resm(TFAIL, "Error: shmat: shmid1 = %d, addr= %p, errno = %d\n", shmid1, cp1, errno); } else { tst_resm(TPASS, "2nd shmget & shmat"); } } /*------------------------------------------------------*/ rm_shm(shmid); rm_shm(shmid1); tst_exit(); } static int rm_shm(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); }