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      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: nice03
     22  *
     23  * Test Description:
     24  *  Verify that any user can successfully increase the nice value of
     25  *  the process by passing an increment value (< max. applicable limits) to
     26  *  nice() system call.
     27  *
     28  * Expected Result:
     29  *  nice() should return value 0 on success and the user should succeed
     30  *  to increase 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  *  nice03 [-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  *  The maximum iterations with the -i option is 9
     65  *
     66  */
     67 
     68 #include <stdio.h>
     69 #include <unistd.h>
     70 #include <errno.h>
     71 #include <fcntl.h>
     72 #include <sys/time.h>
     73 #include <sys/resource.h>
     74 
     75 #include "test.h"
     76 
     77 char *TCID = "nice03";
     78 int TST_TOTAL = 1;
     79 
     80 #define	NICEINC		2
     81 int Org_nice;			/* original priority of the test process */
     82 
     83 void setup();			/* Main setup function of test */
     84 void cleanup();			/* cleanup function for the test */
     85 
     86 int main(int ac, char **av)
     87 {
     88 	int lc;
     89 	int New_nice;		/* priority of process after nice() */
     90 
     91 	tst_parse_opts(ac, av, NULL, NULL);
     92 
     93 	setup();
     94 
     95 	for (lc = 0; TEST_LOOPING(lc); lc++) {
     96 
     97 		tst_count = 0;
     98 
     99 		/*
    100 		 * Call nice(2) with an 'incr' parameter set
    101 		 * to a +ve value < max. applicable limit.
    102 		 * (Linux - 20)
    103 		 */
    104 		TEST(nice(NICEINC));
    105 
    106 		/* check return code */
    107 		if (TEST_RETURN == -1) {
    108 			tst_resm(TFAIL, "nice(%d) Failed, errno=%d : %s",
    109 				 NICEINC, TEST_ERRNO, strerror(TEST_ERRNO));
    110 			continue;
    111 		}
    112 
    113 		New_nice = getpriority(PRIO_PROCESS, 0);
    114 
    115 		/* Validate functionality of the nice() */
    116 		if (New_nice != (Org_nice + NICEINC)) {
    117 			tst_resm(TFAIL, "nice() failed to modify the "
    118 				 "priority of process");
    119 		} else {
    120 			tst_resm(TPASS, "Functionality of nice(%d) is "
    121 				 "correct", NICEINC);
    122 		}
    123 		Org_nice = New_nice;
    124 	}
    125 
    126 	cleanup();
    127 	tst_exit();
    128 }
    129 
    130 /*
    131  * void
    132  * setup() - performs all ONE TIME setup for this test.
    133  *  Create a temporary directory and change directory to it.
    134  *  Get the process id of test process.
    135  *  Get the current nice value of test process and save it in a file.
    136  *  Read the nice value from file into a variable.
    137  */
    138 void setup(void)
    139 {
    140 
    141 	tst_sig(NOFORK, DEF_HANDLER, cleanup);
    142 
    143 	TEST_PAUSE;
    144 
    145 	Org_nice = getpriority(PRIO_PROCESS, 0);
    146 }
    147 
    148 /*
    149  * void
    150  * cleanup() - performs all ONE TIME cleanup for this test at
    151  *             completion or premature exit.
    152  */
    153 void cleanup(void)
    154 {
    155 
    156 }
    157