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@us.ibm.com */
21 /* 06/30/2001 Port to Linux nsharoff@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
main(void)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
rm_shm(int shmid)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