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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_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 (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  *	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