src/test/ipc/shmt/shmt08.c

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/*
 *
 *   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
 *      shmt08
 *
 * CALLS
 *      shmctl(2) shmget(2) shmat(2) shmdt(2)
 *
 * ALGORITHM
 * Create a shared memory segment. Attach it twice at an address
 * that is provided by the system.  Detach the previously attached 
 * segments from the process.
 *
 */


#include <stdio.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <errno.h>

#define K_1  1024

#include "test.h"
#include "usctest.h"

char *TCID="shmt08";            /* 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;

int rm_shm(int);

int main(void)
{
        char    *cp=NULL, *cp1=NULL;
        int     shmid;

        key = (key_t) getpid() ;
        errno = 0 ;
/*-------------------------------------------------------*/


        if ((shmid = shmget(key, 24*K_1, IPC_CREAT|0666)) < 0) {
                perror("shmget");
                tst_resm(TFAIL,"Error: shmget: shmid = %d, errno = %d\n",
                shmid, errno) ;
                tst_exit() ;
        }

        cp = (char *) shmat(shmid, (void *)0, 0);
        if (cp == (char *)-1) {
                tst_resm(TFAIL,"shmat1 Failed");
                rm_shm(shmid) ;
                tst_exit() ;
        }

        cp1 = (char *) shmat(shmid, (void *)0, 0);
        if (cp1 == (char *)-1) {
                perror("shmat2");
                rm_shm(shmid) ;
                tst_exit() ;
        }

        tst_resm(TPASS,"shmget,shmat");

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


        if (shmdt(cp) < 0) {
                perror("shmdt2");
                tst_resm(TFAIL,"shmdt:cp") ;
        }

        if (shmdt(cp1) < 0 ) {
                perror("shmdt1");
                tst_resm(TFAIL,"shmdt:cp1") ;
        }

        tst_resm(TPASS,"shmdt");

/*---------------------------------------------------------*/
        rm_shm(shmid) ;
        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);
}

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