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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  *
     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 (at) 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 
     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(), &param));
    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 */
    151 void setup(void)
    152 {
    153 	struct sched_param p = { 1 };
    154 
    155 	tst_sig(FORK, DEF_HANDLER, cleanup);
    156 
    157 	TEST_PAUSE;
    158 
    159 	/* Change scheduling policy to SCHED_FIFO */
    160 	if ((sched_setscheduler(0, SCHED_FIFO, &p)) == -1) {
    161 		tst_brkm(TBROK, cleanup, "sched_setscheduler() failed");
    162 	}
    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 
    174 /*
    175  * verify_priority() -  This function checks whether the priority is
    176  *			set correctly
    177  */
    178 int verify_priority(void)
    179 {
    180 	struct sched_param p;
    181 
    182 	if ((sched_getparam(0, &p)) == 0) {
    183 		if (p.sched_priority == NEW_PRIORITY) {
    184 			return 1;
    185 		} else {
    186 			tst_resm(TWARN, "sched_getparam() returned priority"
    187 				 " value as %d", p.sched_priority);
    188 			return 0;
    189 		}
    190 	}
    191 
    192 	tst_resm(TWARN, "sched_getparam() failed");
    193 	return 0;
    194 }
    195