/*
*
* 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;
static int rm_shm(int);
int main(void)
{
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();
}
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);
}