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 * Test Name: nice01
22 *
23 * Test Description:
24 * Verify that root can provide a negative value to nice()
25 * and hence root can decrease the nice value of the process
26 * using nice() system call
27 *
28 * Expected Result:
29 * nice() should return value 0 on success and root user should succeed
30 * to decrease the nice value of test process.
31 *
32 * Algorithm:
33 * Setup:
34 * Setup signal handling.
35 * Pause for SIGUSR1 if option specified.
36 *
37 * Test:
38 * Loop if the proper options are given.
39 * Execute system call
40 * Check return code, if system call failed (return=-1)
41 * Log the errno and Issue a FAIL message.
42 * Otherwise,
43 * Verify the Functionality of system call
44 * if successful,
45 * Issue Functionality-Pass message.
46 * Otherwise,
47 * Issue Functionality-Fail message.
48 * Cleanup:
49 * Print errno log and/or timing stats if options given
50 *
51 * Usage: <for command-line>
52 * nice01 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
53 * where, -c n : Run n copies concurrently.
54 * -f : Turn off functionality Testing.
55 * -i n : Execute test n times.
56 * -I x : Execute test for x seconds.
57 * -P x : Pause for x seconds between iterations.
58 * -t : Turn on syscall timing.
59 *
60 * HISTORY
61 * 07/2001 Ported by Wayne Boyer
62 *
63 * RESTRICTIONS:
64 * This test should be run by 'super-user' (root) only.
65 *
66 */
67 #include <unistd.h>
68 #include <sys/types.h>
69 #include <errno.h>
70 #include <fcntl.h>
71 #include <sys/time.h>
72 #include <sys/resource.h>
73
74 #include "test.h"
75
76 #define NICEINC -12
77 #define TEMPFILE "temp_file"
78
79 char *TCID = "nice01";
80 int TST_TOTAL = 1;
81
82 int Org_nice; /* original priority of the test process */
83 FILE *fp;
84
85 void setup(); /* Main setup function of test */
86 void cleanup(); /* cleanup function for the test */
87
main(int ac,char ** av)88 int main(int ac, char **av)
89 {
90 int lc;
91 int New_nice; /* priority of process after nice() */
92 int rval;
93
94 tst_parse_opts(ac, av, NULL, NULL);
95
96 setup();
97
98 for (lc = 0; TEST_LOOPING(lc); lc++) {
99
100 tst_count = 0;
101
102 /*
103 * Call nice(2) with an 'incr' parameter set
104 * to a negative value.
105 */
106 TEST(nice(NICEINC));
107
108 /* check return code */
109 if (TEST_RETURN == -1) {
110 tst_resm(TFAIL, "nice(%d) Failed, errno=%d : %s",
111 NICEINC, TEST_ERRNO, strerror(TEST_ERRNO));
112 continue;
113 }
114
115 New_nice = getpriority(PRIO_PROCESS, 0);
116
117 /* Validate functionality of the nice() */
118 if (New_nice != (Org_nice + NICEINC)) {
119 tst_resm(TFAIL, "nice() fails to modify the "
120 "priority of process");
121 } else {
122 tst_resm(TPASS, "Functionality of nice(%d) "
123 "successful", NICEINC);
124 }
125
126 /* return the process to the original priority */
127 rval = nice(-NICEINC);
128
129 }
130
131 cleanup();
132 tst_exit();
133 }
134
135 /*
136 * setup() - performs all ONE TIME setup for this test.
137 * Make sure the test process uid is super user.
138 * Get the current priority value.
139 */
setup(void)140 void setup(void)
141 {
142
143 tst_require_root();
144
145 tst_sig(NOFORK, DEF_HANDLER, cleanup);
146
147 TEST_PAUSE;
148
149 Org_nice = getpriority(PRIO_PROCESS, 0);
150 }
151
152 /*
153 * cleanup() - performs all ONE TIME cleanup for this test at
154 * completion or premature exit.
155 * Remove the test directory and testfile created in the setup.
156 */
cleanup(void)157 void cleanup(void)
158 {
159
160 }
161