test/ipc/shmt/shmt06.c
/*
 *
 *   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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

/* 12/20/2002   Port to LTP     robbiew@us.ibm.com */
/* 06/30/2001   Port to Linux   nsharoff@us.ibm.com */

/*
 * NAME
 *	shmt06
 *
 * CALLS
 *	shmctl(2) shmget(2) shmat(2)
 *
 * ALGORITHM
 * Parent process forks a child. Child pauses until parent has created
 * a shared memory segment, attached to it and written to it too. At that
 * time child gets the shared memory segment id, attaches to it at a
 * different address than the parents and verifies that its contents are 
 * the same as the contents of the parent attached segment.
 *
 */

#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/utsname.h>
#include <signal.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>

#define		ADDR		(void *)0x80000
#define		ADDR1		(void *)0xA0000
#define         ADDR_MIPS       (void *)0x80000
#define         ADDR1_MIPS      (void *)0xC0000
#define 	ADDR_IA    	(void *)0x40000000
#define 	ADDR1_IA    	(void *)0x50000000
#define		SIZE		16*1024

/** LTP Port **/
#include "test.h"
#include "usctest.h"


char *TCID="shmt06";            /* Test program identifier.    */
int TST_TOTAL=2;                /* Total number of test cases. */
extern int Tst_count;           /* Test Case counter for tst_* routines */
/**************/

key_t	key;
sigset_t mysigset;

int child(void);
int rm_shm(int);

int main(void)
{
	char	*cp=NULL;
	int	pid, pid1, shmid;
	int	status;
	
	key = (key_t)getpid() ;

	signal(SIGUSR1, SIG_DFL);

	sigemptyset(&mysigset);
	sigaddset(&mysigset,SIGUSR1);
	sigprocmask(SIG_BLOCK,&mysigset,NULL);

	pid = fork();
	switch (pid) {
	case -1:
		tst_resm(TBROK,"fork failed");
                tst_exit() ;
	case 0:
		child();
	}

/*------------------------------------------------------*/


	if ((shmid = shmget(key, SIZE, IPC_CREAT|0666)) < 0) {
		perror("shmget");
		tst_resm(TFAIL,"Error: shmget: shmid = %d, errno = %d\n",
		shmid, errno) ;
		/*
		 * kill the child if parent failed to do the attach
		 */
		(void)kill(pid, SIGINT);
	}
	else {
#ifdef __ia64__
		  cp = (char *) shmat(shmid, ADDR_IA, 0);
#elif defined(__ARM_ARCH_4T__)
		  cp = (char *) shmat(shmid, (void*) NULL, 0);
#elif defined(__mips__)
		  cp = (char *) shmat(shmid, ADDR_MIPS, 0);
#else
		  cp = (char *) shmat(shmid, ADDR, 0);
#endif	
		if (cp == (char *)-1) {
			perror("shmat") ;
			tst_resm(TFAIL,
			"Error: shmat: shmid = %d, errno = %d\n",
			shmid, errno) ;

		/* kill the child if parent failed to do the attch */

			kill(pid, SIGINT) ;   

		/* remove shared memory segment */

			rm_shm(shmid) ;  

			tst_exit() ;
		} 
		*cp 	= 'A';
		*(cp+1) = 'B';
		*(cp+2) = 'C';

		kill(pid, SIGUSR1);
		while ( (pid1 = wait(&status)) < 0 && 
			(errno == EINTR) ) ;
		if (pid1 != pid) {
			tst_resm(TFAIL,"Waited on the wrong child") ;
			tst_resm(TFAIL,
			"Error: wait_status = %d, pid1= %d\n", status, pid1) ;
		}
	}

	tst_resm(TPASS,"shmget,shmat");

/*---------------------------------------------------------------*/


	if (shmdt(cp) < 0) {
		tst_resm(TFAIL,"shmdt");
	}

	tst_resm(TPASS,"shmdt");

/*-------------------------------------------------------------*/

	rm_shm(shmid) ;
	tst_exit() ;

/*-----------------------------------------------------------*/
	return(0);
}

int child(void)
{
	int 	shmid ,
		chld_pid ;
	char 	*cp;

	sigemptyset(&mysigset);
	sigsuspend(&mysigset);
	chld_pid = getpid() ;
	
	if ((shmid = shmget(key, SIZE, 0)) < 0) {
		perror("shmget:child process");
		tst_resm(TFAIL,
		"Error: shmget: errno=%d, shmid=%d, child_pid=%d\n",
		errno, shmid, chld_pid);
	}
	else {
#ifdef __ia64__	
		  cp = (char *) shmat(shmid, ADDR1_IA, 0);
#elif defined(__ARM_ARCH_4T__)
		  cp = (char *) shmat(shmid, (void *) NULL, 0);
#elif defined(__mips__)	
		  cp = (char *) shmat(shmid, ADDR1_MIPS, 0);
#else
		  cp = (char *) shmat(shmid, ADDR1, 0);
#endif
		if (cp == (char *)-1) {
			perror("shmat:child process");
			tst_resm(TFAIL,
			"Error: shmat: errno=%d, shmid=%d, child_pid=%d\n",
			errno, shmid, chld_pid);
		} else {
			if (*cp != 'A') {
				tst_resm(TFAIL,"child: not A\n");
			}
			if (*(cp+1) != 'B') {
				tst_resm(TFAIL,"child: not B\n");
			}
			if (*(cp+2) != 'C') {
				tst_resm(TFAIL,"child: not C\n");
			}
			if (*(cp+8192) != 0) {
				tst_resm(TFAIL,"child: not 0\n");
			}
		}

	}
	tst_exit() ;
        return(0);
}

int rm_shm(shmid)
int shmid ;
{
        if (shmctl(shmid, IPC_RMID, NULL) == -1) {
                perror("shmctl");
                tst_resm(TFAIL,
                "shmctl Failed to remove: shmid = %d, errno = %d\n",
                shmid, errno) ;
                tst_exit();
        }
        return(0);
}

