1/*
2 *
3 *   Copyright (c) International Business Machines  Corp., 2001
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/*
21 * NAME
22 *	shmget04.c
23 *
24 * DESCRIPTION
25 *	shmget04 - test for EACCES error
26 *
27 * ALGORITHM
28 *	create a shared memory segment without read or write permissions
29 *	loop if that option was specified
30 *	  call shmget() with SHM_RW flag using TEST() macro
31 *	  check the errno value
32 *	    issue a PASS message if we get EACCES
33 *	  otherwise, the tests fails
34 *	    issue a FAIL message
35 *	call cleanup
36 *
37 * USAGE:  <for command-line>
38 *  shmget04 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
39 *     where,  -c n : Run n copies concurrently.
40 *             -e   : Turn on errno logging.
41 *	       -i n : Execute test n times.
42 *	       -I x : Execute test for x seconds.
43 *	       -P x : Pause for x seconds between iterations.
44 *	       -t   : Turn on syscall timing.
45 *
46 * HISTORY
47 *	03/2001 - Written by Wayne Boyer
48 *
49 * RESTRICTIONS
50 *	none
51 */
52#include <pwd.h>
53#include "ipcshm.h"
54
55char *TCID = "shmget04";
56int TST_TOTAL = 1;
57
58char nobody_uid[] = "nobody";
59struct passwd *ltpuser;
60
61int shm_id_1 = -1;
62
63int main(int ac, char **av)
64{
65	int lc;
66
67	tst_parse_opts(ac, av, NULL, NULL);
68
69	setup();		/* global setup */
70
71	/* The following loop checks looping state if -i option given */
72
73	for (lc = 0; TEST_LOOPING(lc); lc++) {
74		/* reset tst_count in case we are looping */
75		tst_count = 0;
76
77		/*
78		 * use the TEST() macro to make the call
79		 */
80
81		TEST(shmget(shmkey, SHM_SIZE, SHM_RW));
82
83		if (TEST_RETURN != -1) {
84			tst_resm(TFAIL, "call succeeded when error expected");
85			continue;
86		}
87
88		switch (TEST_ERRNO) {
89		case EACCES:
90			tst_resm(TPASS, "expected failure - errno = "
91				 "%d : %s", TEST_ERRNO, strerror(TEST_ERRNO));
92			break;
93		default:
94			tst_resm(TFAIL, "call failed with an "
95				 "unexpected error - %d : %s",
96				 TEST_ERRNO, strerror(TEST_ERRNO));
97			break;
98		}
99	}
100
101	cleanup();
102
103	tst_exit();
104}
105
106/*
107 * setup() - performs all the ONE TIME setup for this test.
108 */
109void setup(void)
110{
111	tst_require_root();
112
113	tst_sig(NOFORK, DEF_HANDLER, cleanup);
114
115	TEST_PAUSE;
116
117	/* Switch to nobody user for correct error code collection */
118	ltpuser = getpwnam(nobody_uid);
119	if (setuid(ltpuser->pw_uid) == -1) {
120		tst_resm(TINFO, "setuid failed to "
121			 "to set the effective uid to %d", ltpuser->pw_uid);
122		perror("setuid");
123	}
124
125	/*
126	 * Create a temporary directory and cd into it.
127	 * This helps to ensure that a unique msgkey is created.
128	 * See ../lib/libipc.c for more information.
129	 */
130	tst_tmpdir();
131
132	/* get an IPC resource key */
133	shmkey = getipckey();
134
135	/* create a shared memory segment without read or access permissions */
136	if ((shm_id_1 = shmget(shmkey, SHM_SIZE, IPC_CREAT | IPC_EXCL)) == -1) {
137		tst_brkm(TBROK, cleanup, "Failed to create shared memory "
138			 "segment in setup");
139	}
140}
141
142/*
143 * cleanup() - performs all the ONE TIME cleanup for this test at completion
144 * 	       or premature exit.
145 */
146void cleanup(void)
147{
148	/* if it exists, remove the shared memory resource */
149	rm_shm(shm_id_1);
150
151	tst_rmdir();
152
153}
154