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