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      1 /*
      2  *
      3  *   Copyright (c) International Business Machines  Corp., 2002
      4  *
      5  *   This program is free software;  you can redistribute it and/or modify
      6  *   it under the terms of the GNU General Public License as published by
      7  *   the Free Software Foundation; either version 2 of the License, or
      8  *   (at your option) any later version.
      9  *
     10  *   This program is distributed in the hope that it will be useful,
     11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
     12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
     13  *   the GNU General Public License for more details.
     14  *
     15  *   You should have received a copy of the GNU General Public License
     16  *   along with this program;  if not, write to the Free Software
     17  *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
     18  */
     19 
     20 /* 12/20/2002   Port to LTP     robbiew (at) us.ibm.com */
     21 /* 06/30/2001   Port to Linux   nsharoff (at) us.ibm.com */
     22 
     23 /*
     24  * NAME
     25  *	shmt08
     26  *
     27  * CALLS
     28  *	shmctl(2) shmget(2) shmat(2) shmdt(2)
     29  *
     30  * ALGORITHM
     31  * Create a shared memory segment. Attach it twice at an address
     32  * that is provided by the system.  Detach the previously attached
     33  * segments from the process.
     34  *
     35  */
     36 
     37 #include <stdio.h>
     38 #include <sys/types.h>
     39 #include <sys/ipc.h>
     40 #include <sys/shm.h>
     41 #include <errno.h>
     42 
     43 #define K_1  1024
     44 
     45 /** LTP Port **/
     46 #include "test.h"
     47 
     48 char *TCID = "shmt08";		/* Test program identifier.    */
     49 int TST_TOTAL = 2;		/* Total number of test cases. */
     50 /**************/
     51 
     52 key_t key;
     53 
     54 static int rm_shm(int);
     55 
     56 int main(void)
     57 {
     58 	char *cp = NULL, *cp1 = NULL;
     59 	int shmid;
     60 
     61 	key = (key_t) getpid();
     62 	errno = 0;
     63 /*-------------------------------------------------------*/
     64 
     65 	if ((shmid = shmget(key, 24 * K_1, IPC_CREAT | 0666)) < 0) {
     66 		perror("shmget");
     67 		tst_brkm(TFAIL, NULL,
     68 			 "Error: shmget: shmid = %d, errno = %d\n",
     69 			 shmid, errno);
     70 	}
     71 
     72 	cp = shmat(shmid, NULL, 0);
     73 	if (cp == (char *)-1) {
     74 		tst_resm(TFAIL, "shmat1 Failed");
     75 		rm_shm(shmid);
     76 		tst_exit();
     77 	}
     78 
     79 	cp1 = shmat(shmid, NULL, 0);
     80 	if (cp1 == (char *)-1) {
     81 		perror("shmat2");
     82 		rm_shm(shmid);
     83 		tst_exit();
     84 	}
     85 
     86 	tst_resm(TPASS, "shmget,shmat");
     87 
     88 /*--------------------------------------------------------*/
     89 
     90 	if (shmdt(cp) < 0) {
     91 		perror("shmdt2");
     92 		tst_resm(TFAIL, "shmdt:cp");
     93 	}
     94 
     95 	if (shmdt(cp1) < 0) {
     96 		perror("shmdt1");
     97 		tst_resm(TFAIL, "shmdt:cp1");
     98 	}
     99 
    100 	tst_resm(TPASS, "shmdt");
    101 
    102 /*---------------------------------------------------------*/
    103 	rm_shm(shmid);
    104 	tst_exit();
    105 }
    106 
    107 static int rm_shm(int shmid)
    108 {
    109 	if (shmctl(shmid, IPC_RMID, NULL) == -1) {
    110 		perror("shmctl");
    111 		tst_brkm(TFAIL,
    112 			 NULL,
    113 			 "shmctl Failed to remove: shmid = %d, errno = %d\n",
    114 			 shmid, errno);
    115 	}
    116 	return (0);
    117 }
    118