delete_module03.c revision 817d8095fbfe5ebe22b29f58b7483f3d8d5e3fcc 
1/*
2 * Copyright (c) Wipro Technologies Ltd, 2002.  All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * You should have received a copy of the GNU General Public License along
13 * with this program; if not, write the Free Software Foundation, Inc.,
14 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
15 *
16 */
17
18/*
19 *    AUTHOR: Madhu T L <madhu.tarikere@wipro.com>
20 *
21 *    DESCRIPTION
22 *      Verify that, delete_module(2) returns -1 and sets errno to EWOULDBLOCK,
23 *      if tried to remove a module while other modules depend on this module.
24 *
25 */
26
27#include <errno.h>
28#include "test.h"
29#include "old_module.h"
30#include "safe_macros.h"
31#include "lapi/syscalls.h"
32
33#define DUMMY_MOD		"dummy_del_mod"
34#define DUMMY_MOD_KO		"dummy_del_mod.ko"
35#define DUMMY_MOD_DEP		"dummy_del_mod_dep"
36#define DUMMY_MOD_DEP_KO	"dummy_del_mod_dep.ko"
37
38static int dummy_mod_loaded;
39static int dummy_mod_dep_loaded;
40
41char *TCID = "delete_module03";
42
43int TST_TOTAL = 1;
44
45static void setup();
46static void cleanup(void);
47
48int main(int argc, char **argv)
49{
50	int lc;
51
52	tst_parse_opts(argc, argv, NULL, NULL);
53
54	setup();
55
56	for (lc = 0; TEST_LOOPING(lc); lc++) {
57		tst_count = 0;
58
59		TEST(ltp_syscall(__NR_delete_module, DUMMY_MOD, 0));
60
61		if (TEST_RETURN < 0) {
62			switch (errno) {
63			case EWOULDBLOCK:
64				tst_resm(TPASS | TTERRNO,
65					 "delete_module() failed as expected");
66			break;
67			default:
68				tst_resm(TFAIL | TTERRNO, "delete_module() "
69					 "failed unexpectedly; expected: "
70					 "%d - %s", EWOULDBLOCK,
71					 strerror(EWOULDBLOCK));
72			break;
73			}
74		} else {
75			tst_resm(TFAIL, "delete_module()"
76				 "succeeded unexpectedly");
77			dummy_mod_loaded = 0;
78			/*
79			 * insmod DUMMY_MOD_KO again in case running
80			 * with -i option
81			 */
82			tst_module_load(cleanup, DUMMY_MOD_KO, NULL);
83			dummy_mod_loaded = 1;
84		}
85	}
86
87	cleanup();
88	tst_exit();
89
90}
91
92static void setup(void)
93{
94	tst_sig(NOFORK, DEF_HANDLER, cleanup);
95
96	tst_require_root();
97
98	/* Load first kernel module */
99	tst_module_load(cleanup, DUMMY_MOD_KO, NULL);
100	dummy_mod_loaded = 1;
101
102	/* Load dependant kernel module */
103	tst_module_load(cleanup, DUMMY_MOD_DEP_KO, NULL);
104	dummy_mod_dep_loaded = 1;
105
106	TEST_PAUSE;
107}
108
109static void cleanup(void)
110{
111	/* Unload dependent kernel module */
112	if (dummy_mod_dep_loaded == 1)
113		tst_module_unload(NULL, DUMMY_MOD_DEP_KO);
114
115	/* Unload first kernel module */
116	if (dummy_mod_loaded == 1)
117		tst_module_unload(NULL, DUMMY_MOD_KO);
118}
119