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      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  *    TEST IDENTIFIER	: sched_setparam02
     19  *
     20  *    EXECUTED BY	: root / superuser
     21  *
     22  *    TEST TITLE	: Checks functionality for sched_setparam(2)
     23  *
     24  *    TEST CASE TOTAL	: 1
     25  *
     26  *    AUTHOR		: Saji Kumar.V.R <saji.kumar (at) wipro.com>
     27  *
     28  *    SIGNALS
     29  * 	Uses SIGUSR1 to pause before test if option set.
     30  * 	(See the parse_opts(3) man page).
     31  *
     32  *    DESCRIPTION
     33  *	This test changes the scheduling priority for current process
     34  *	and verifies it by calling sched_getparam().
     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  * 	  Execute system call
     44  *	  If scheduling priority is set properly,
     45  *		TEST passed
     46  *	  else
     47  *		TEST failed
     48  *
     49  * 	Cleanup:
     50  * 	  Print errno log and/or timing stats if options given
     51  *
     52  * USAGE:  <for command-line>
     53  *  sched_setparam02 [-c n] [-e] [-i n] [-I x] [-P x] [-t] [-h] [-f] [-p]
     54  *			where,  -c n : Run n copies concurrently.
     55  *				-e   : Turn on errno logging.
     56  *				-h   : Show help screen
     57  *				-f   : Turn off functional testing
     58  *				-i n : Execute test n times.
     59  *				-I x : Execute test for x seconds.
     60  *				-p   : Pause for SIGUSR1 before starting
     61  *				-P x : Pause for x seconds between iterations.
     62  *				-t   : Turn on syscall timing.
     63  *
     64  ****************************************************************/
     65 
     66 #include <errno.h>
     67 #include <sched.h>
     68 #include "test.h"
     69 
     70 #define FIFO_OR_RR_PRIO 5
     71 #define OTHER_PRIO 0
     72 
     73 static void setup();
     74 static void cleanup();
     75 static int verify_priority(int);
     76 
     77 char *TCID = "sched_setparam02";
     78 
     79 static struct sched_param param;
     80 static struct sched_param param1 = { 1 };
     81 
     82 static struct test_cases_t {
     83 	char *desc;
     84 	int policy;
     85 	int priority;
     86 } testcases[] = {
     87 	{
     88 	"Test with policy SCHED_FIFO", SCHED_FIFO, FIFO_OR_RR_PRIO}, {
     89 	"Test with policy SCHED_RR", SCHED_RR, FIFO_OR_RR_PRIO}, {
     90 	"Test with SCHED_OTHER", SCHED_OTHER, OTHER_PRIO}
     91 };
     92 
     93 int TST_TOTAL = sizeof(testcases) / sizeof(testcases[0]);
     94 
     95 int main(int ac, char **av)
     96 {
     97 
     98 	int lc, i;
     99 
    100 	tst_parse_opts(ac, av, NULL, NULL);
    101 
    102 	setup();
    103 
    104 	for (lc = 0; TEST_LOOPING(lc); lc++) {
    105 
    106 		tst_count = 0;
    107 
    108 		for (i = 0; i < TST_TOTAL; ++i) {
    109 
    110 			if (i == 2) {
    111 				param1.sched_priority = 0;
    112 			} else {
    113 				param1.sched_priority = 1;
    114 			}
    115 			if ((sched_setscheduler(0, testcases[i].policy,
    116 						&param1)) == -1) {
    117 				tst_brkm(TBROK, cleanup, "sched_setscheduler()"
    118 					 "  failed");
    119 			}
    120 			param.sched_priority = testcases[i].priority;
    121 			/*
    122 			 * Call sched_setparam(2) with pid=0 sothat it will
    123 			 * set the scheduling parameters for the calling process
    124 			 */
    125 			TEST(sched_setparam(0, &param));
    126 
    127 			if ((TEST_RETURN == 0) && (verify_priority(i))) {
    128 				tst_resm(TPASS, "%s Passed", testcases[i].desc);
    129 			} else {
    130 				tst_resm(TFAIL | TTERRNO,
    131 					 "%s Failed. sched_setparam()"
    132 					 " returned %ld", testcases[i].desc,
    133 					 TEST_RETURN);
    134 			}
    135 		}
    136 	}
    137 
    138 	/* cleanup and exit */
    139 	cleanup();
    140 
    141 	tst_exit();
    142 
    143 }
    144 
    145 /* setup() - performs all ONE TIME setup for this test */
    146 void setup(void)
    147 {
    148 
    149 	tst_sig(NOFORK, DEF_HANDLER, cleanup);
    150 
    151 	TEST_PAUSE;
    152 
    153 }
    154 
    155 /*
    156  *cleanup() -  performs all ONE TIME cleanup for this test at
    157  *		completion or premature exit.
    158  */
    159 void cleanup(void)
    160 {
    161 }
    162 
    163 /*
    164  * verify_priority() -  This function checks whether the priority is
    165  *			set correctly
    166  */
    167 int verify_priority(int i)
    168 {
    169 	struct sched_param p;
    170 
    171 	if ((sched_getparam(0, &p)) == 0) {
    172 		if (p.sched_priority == testcases[i].priority) {
    173 			return 1;
    174 		} else {
    175 			tst_resm(TWARN, "sched_getparam() returned priority"
    176 				 " value as %d", p.sched_priority);
    177 			return 0;
    178 		}
    179 	}
    180 
    181 	tst_resm(TWARN, "sched_getparam() failed");
    182 	return 0;
    183 }
    184