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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  *		 shmt02
     26  *
     27  * CALLS
     28  *		 shmctl(2) shmget(2)
     29  *
     30  * ALGORITHM
     31  * Create and attach a shared memory segment, write to it
     32  * and then remove it.		  Verify that the shared memory segment
     33  * is accessible as long as the process is still alive.
     34  *
     35  */
     36 
     37 #include <stdio.h>
     38 #include <sys/types.h>
     39 #include <sys/ipc.h>
     40 #include <sys/shm.h>
     41 #include <sys/utsname.h>
     42 #include <errno.h>
     43 
     44 /** LTP Port **/
     45 #include "test.h"
     46 
     47 char *TCID = "shmt02";		/* Test program identifier.    */
     48 int TST_TOTAL = 3;		/* Total number of test cases. */
     49 
     50 /**************/
     51 
     52 #define K_1 1024
     53 
     54 static int rm_shm(int);
     55 
     56 int main(void)
     57 {
     58 	register int shmid;
     59 	char *cp;
     60 	key_t key;
     61 
     62 	errno = 0;
     63 	key = (key_t) getpid();
     64 
     65 /*----------------------------------------------------------------*/
     66 
     67 	if ((shmid = shmget(key, 16 * K_1, IPC_CREAT | 0666)) < 0) {
     68 		perror("shmget");
     69 		tst_brkm(TFAIL, NULL,
     70 			 "shmget Failed: shmid = %d, errno = %d\n",
     71 			 shmid, errno);
     72 	}
     73 
     74 	tst_resm(TPASS, "shmget");
     75 
     76 /*----------------------------------------------------------------*/
     77 
     78 	cp = shmat(shmid, NULL, 0);
     79 
     80 	if (cp == (char *)-1) {
     81 		perror("shmat");
     82 		tst_resm(TFAIL, "shmat Failed: shmid = %d, errno = %d\n",
     83 			 shmid, errno);
     84 		rm_shm(shmid);
     85 		tst_exit();
     86 	}
     87 
     88 	*cp = '1';
     89 	*(cp + 1) = '2';
     90 
     91 	tst_resm(TPASS, "shmat");
     92 
     93 /*----------------------------------------------------------------*/
     94 
     95 	rm_shm(shmid);
     96 
     97 	if (*cp != '1' || *(cp + 1) != '2') {
     98 		tst_resm(TFAIL,
     99 			 "Error in shared memory contents: shmid = %d\n",
    100 			 shmid);
    101 	}
    102 
    103 	tst_resm(TPASS, "Correct shared memory contents");
    104 
    105 /*------------------------------------------------------------------*/
    106 
    107 	tst_exit();
    108 }
    109 
    110 static int rm_shm(int shmid)
    111 {
    112 	if (shmctl(shmid, IPC_RMID, NULL) == -1) {
    113 		perror("shmctl");
    114 		tst_brkm(TFAIL,
    115 			 NULL,
    116 			 "shmctl Failed to remove: shmid = %d, errno = %d\n",
    117 			 shmid, errno);
    118 	}
    119 	return (0);
    120 }
    121