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_getparam02
20  *
21  *    EXECUTED BY	: anyone
22  *
23  *    TEST TITLE	: Get scheduling parametes for parent process
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  *	Verifies functionality of sched_getparam() for a process other than
35  *	current process (ie, pid != 0). Here we get the scheduling parameters
36  *	for parent process.
37  *
38  * 	Setup:
39  * 	  Setup signal handling.
40  *	  Pause for SIGUSR1 if option specified.
41  *
42  * 	Test:
43  *	 Loop if the proper options are given.
44  *	 fork a child
45  *
46  *	 CHILD:
47  * 	  Gets the scheduling parameters for parent process
48  *	  If successfull,
49  *		TEST passed
50  *	  else
51  *		TEST failed.
52  *
53  *	 PARENT:
54  *	  wait for child to finish
55  *
56  * 	Cleanup:
57  * 	  Print errno log and/or timing stats if options given
58  *
59  * USAGE:  <for command-line>
60  *  sched_getparam02 [-c n] [-e] [-i n] [-I x] [-P x] [-t] [-h] [-f] [-p]
61  *			where,  -c n : Run n copies concurrently.
62  *				-e   : Turn on errno logging.
63  *				-h   : Show help screen
64  *				-f   : Turn off functional testing
65  *				-i n : Execute test n times.
66  *				-I x : Execute test for x seconds.
67  *				-p   : Pause for SIGUSR1 before starting
68  *				-P x : Pause for x seconds between iterations.
69  *				-t   : Turn on syscall timing.
70  *
71  ****************************************************************/
72 
73 #include <errno.h>
74 #include <sched.h>
75 #include <sys/wait.h>
76 #include <stdlib.h>
77 #include "test.h"
78 
79 static void setup();
80 static void cleanup();
81 
82 char *TCID = "sched_getparam02";
83 int TST_TOTAL = 1;
84 
85 static struct sched_param param;
86 
87 int main(int ac, char **av)
88 {
89 
90 	int lc;
91 	int status;
92 	pid_t child_pid;
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 		switch (child_pid = FORK_OR_VFORK()) {
103 
104 		case -1:
105 			/* fork() failed */
106 			tst_resm(TFAIL, "fork() failed");
107 			continue;
108 
109 		case 0:
110 			/* Child */
111 			param.sched_priority = 100;
112 
113 			/*
114 			 * Call sched_getparam(2) with pid = getppid() sothat
115 			 * it will get the scheduling parameters for parent
116 			 * process
117 			 */
118 			TEST(sched_getparam(getppid(), &param));
119 
120 			/*
121 			 * Check return code & priority. For normal process,
122 			 * scheduling policy is SCHED_OTHER. For this
123 			 * scheduling policy, only allowed priority value is 0.
124 			 * So we should get 0 for priority value
125 			 */
126 			if (TEST_RETURN == 0 && param.sched_priority == 0)
127 				exit(0);
128 			else {
129 				tst_resm(TWARN, "sched_getparam()"
130 					 "returned %ld, errno = %d : %s;"
131 					 " returned process priority value"
132 					 " is %d", TEST_RETURN, TEST_ERRNO,
133 					 strerror(TEST_ERRNO),
134 					 param.sched_priority);
135 				exit(1);
136 			}
137 
138 		default:
139 			/* Parent */
140 			if ((waitpid(child_pid, &status, 0)) < 0) {
141 				tst_resm(TFAIL, "wait() failed");
142 				continue;
143 			}
144 			if ((WIFEXITED(status)) && (WEXITSTATUS(status) == 0))
145 				tst_resm(TPASS, "Test Passed");
146 			else
147 				tst_resm(TFAIL, "Test Failed");
148 		}
149 
150 	}
151 
152 	cleanup();
153 	tst_exit();
154 }
155 
156 /* setup() - performs all ONE TIME setup for this test */
157 void setup(void)
158 {
159 
160 	tst_sig(FORK, DEF_HANDLER, cleanup);
161 
162 	TEST_PAUSE;
163 
164 }
165 
166 /*
167  *cleanup() -  performs all ONE TIME cleanup for this test at
168  *		completion or premature exit.
169  */
170 void cleanup(void)
171 {
172 }
173