Home | History | Annotate | Download | only in shmt 
      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  *		 shmt05
     26  *
     27  * CALLS
     28  *		 shmctl(2) shmget(2) shmat(2)
     29  *
     30  * ALGORITHM
     31  * Create two shared memory segments and attach them to the same process
     32  * at two different addresses. The addresses DO BUMP into each other.
     33  * The second attach should Fail.
     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 #include <time.h>
     44 
     45 /** LTP Port **/
     46 #include "test.h"
     47 
     48 char *TCID = "shmt05";		/* Test program identifier.    */
     49 int TST_TOTAL = 2;		/* Total number of test cases. */
     50 /**************/
     51 
     52 key_t key[2];
     53 
     54 #define		 SIZE		 (2*SHMLBA)
     55 
     56 static int rm_shm(int);
     57 
     58 int main(void)
     59 {
     60 	int shmid, shmid1;
     61 	char *cp, *cp1;
     62 
     63 	srand48((getpid() << 16) + (unsigned)time(NULL));
     64 
     65 	key[0] = (key_t) lrand48();
     66 	key[1] = (key_t) lrand48();
     67 
     68 	cp = NULL;
     69 	cp1 = NULL;
     70 
     71 /*--------------------------------------------------------*/
     72 
     73 	if ((shmid = shmget(key[0], SIZE, IPC_CREAT | 0666)) < 0) {
     74 		perror("shmget");
     75 		tst_resm(TFAIL,
     76 			 "Error: shmget: shmid = %d, errno = %d\n",
     77 			 shmid, errno);
     78 	} else {
     79 		cp = shmat(shmid, NULL, 0);
     80 
     81 		if (cp == (char *)-1) {
     82 			tst_resm(TFAIL, "shmat");
     83 			rm_shm(shmid);
     84 		}
     85 	}
     86 
     87 	tst_resm(TPASS, "shmget & shmat");
     88 
     89 /*--------------------------------------------------------*/
     90 
     91 	if ((shmid1 = shmget(key[1], SIZE, IPC_CREAT | 0666)) < 0) {
     92 		perror("shmget2");
     93 		tst_resm(TFAIL,
     94 			 "Error: shmget: shmid1 = %d, errno = %d\n",
     95 			 shmid1, errno);
     96 	} else {
     97 		cp1 = shmat(shmid1, cp + (SIZE / 2), 0);
     98 		if (cp1 != (char *)-1) {
     99 			perror("shmat");
    100 			tst_resm(TFAIL,
    101 				 "Error: shmat: shmid1 = %d, addr= %p, errno = %d\n",
    102 				 shmid1, cp1, errno);
    103 		} else {
    104 			tst_resm(TPASS, "2nd shmget & shmat");
    105 		}
    106 	}
    107 
    108 /*------------------------------------------------------*/
    109 
    110 	rm_shm(shmid);
    111 	rm_shm(shmid1);
    112 
    113 	tst_exit();
    114 }
    115 
    116 static int rm_shm(int shmid)
    117 {
    118 	if (shmctl(shmid, IPC_RMID, NULL) == -1) {
    119 		perror("shmctl");
    120 		tst_brkm(TFAIL,
    121 			 NULL,
    122 			 "shmctl Failed to remove: shmid = %d, errno = %d\n",
    123 			 shmid, errno);
    124 	}
    125 	return (0);
    126 }
    127