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 * TEST IDENTIFIER : sched_setparam03
20 *
21 * EXECUTED BY : root / superuser
22 *
23 * TEST TITLE : Checks functionality for sched_setparam(2) for pid!=0
24 *
25 * TEST CASE TOTAL : 1
26 *
27 * AUTHOR : Saji Kumar.V.R <saji.kumar@wipro.com>
28 *
29 * SIGNALS
30 * Uses SIGUSR1 to pause before test if option set.
31 * (See the parse_opts(3) man page).
32 *
33 * DESCRIPTION
34 * This test forks a child & changes its parent's scheduling priority
35 *
36 * Setup:
37 * Setup signal handling.
38 * Pause for SIGUSR1 if option specified.
39 * Change scheduling policy to SCHED_FIFO
40 *
41 * Test:
42 * Loop if the proper options are given.
43 * Fork a child
44 *
45 * CHILD:
46 * Changes scheduling priority for parent
47 *
48 * PARENT:
49 * If scheduling priority is set properly,
50 * TEST passed
51 * else
52 * TEST failed
53 *
54 * Cleanup:
55 * Print errno log and/or timing stats if options given
56 *
57 * USAGE: <for command-line>
58 * sched_setparam03 [-c n] [-e] [-i n] [-I x] [-P x] [-t] [-h] [-f] [-p]
59 * where, -c n : Run n copies concurrently.
60 * -e : Turn on errno logging.
61 * -h : Show help screen
62 * -f : Turn off functional testing
63 * -i n : Execute test n times.
64 * -I x : Execute test for x seconds.
65 * -p : Pause for SIGUSR1 before starting
66 * -P x : Pause for x seconds between iterations.
67 * -t : Turn on syscall timing.
68 *
69 ****************************************************************/
70
71 #include <err.h>
72 #include <errno.h>
73 #include <sched.h>
74 #include <sys/wait.h>
75 #include "test.h"
76
77 #define NEW_PRIORITY 5
78
79 static void setup();
80 static void cleanup();
81 static int verify_priority();
82
83 char *TCID = "sched_setparam03";
84 int TST_TOTAL = 1;
85
86 static struct sched_param param = { NEW_PRIORITY };
87
main(int ac,char ** av)88 int main(int ac, char **av)
89 {
90
91 int lc;
92 int status;
93 pid_t child_pid;
94
95 tst_parse_opts(ac, av, NULL, NULL);
96
97 setup();
98
99 for (lc = 0; TEST_LOOPING(lc); lc++) {
100
101 tst_count = 0;
102
103 switch (child_pid = FORK_OR_VFORK()) {
104
105 case -1:
106 /* fork() failed */
107 tst_resm(TFAIL, "fork() failed");
108 continue;
109
110 case 0:
111 /* Child */
112
113 /*
114 * Call sched_setparam(2) with pid = getppid() so that
115 * it will set the scheduling parameters for parent
116 * process
117 */
118 TEST(sched_setparam(getppid(), ¶m));
119
120 if (TEST_RETURN == -1) {
121 err(0, "sched_setparam returned %ld",
122 TEST_RETURN);
123 }
124 exit(1);
125
126 default:
127 /* Parent */
128 if ((waitpid(child_pid, &status, 0)) < 0) {
129 tst_resm(TFAIL, "wait() failed");
130 continue;
131 }
132
133 /*
134 * Verify that parent's scheduling priority has
135 * changed.
136 */
137 if ((WIFEXITED(status)) && (WEXITSTATUS(status)) &&
138 (verify_priority())) {
139 tst_resm(TPASS, "Test Passed");
140 } else {
141 tst_resm(TFAIL, "Test Failed");
142 }
143 }
144 }
145
146 cleanup();
147 tst_exit();
148 }
149
150 /* setup() - performs all ONE TIME setup for this test */
setup(void)151 void setup(void)
152 {
153 struct sched_param p = { 1 };
154
155 tst_require_root();
156
157 tst_sig(FORK, DEF_HANDLER, cleanup);
158
159 TEST_PAUSE;
160
161 /* Change scheduling policy to SCHED_FIFO */
162 if ((sched_setscheduler(0, SCHED_FIFO, &p)) == -1) {
163 tst_brkm(TBROK, cleanup, "sched_setscheduler() failed");
164 }
165
166 }
167
168 /*
169 *cleanup() - performs all ONE TIME cleanup for this test at
170 * completion or premature exit.
171 */
cleanup(void)172 void cleanup(void)
173 {
174 }
175
176 /*
177 * verify_priority() - This function checks whether the priority is
178 * set correctly
179 */
verify_priority(void)180 int verify_priority(void)
181 {
182 struct sched_param p;
183
184 if ((sched_getparam(0, &p)) == 0) {
185 if (p.sched_priority == NEW_PRIORITY) {
186 return 1;
187 } else {
188 tst_resm(TWARN, "sched_getparam() returned priority"
189 " value as %d", p.sched_priority);
190 return 0;
191 }
192 }
193
194 tst_resm(TWARN, "sched_getparam() failed");
195 return 0;
196 }
197