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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: nice01
     22  *
     23  * Test Description:
     24  *  Verify that root can provide a negative value  to nice()
     25  *  and hence root can decrease the nice value of the process
     26  *  using nice() system call
     27  *
     28  * Expected Result:
     29  *  nice() should return value 0 on success and root user should succeed
     30  *  to decrease 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  *  nice01 [-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  *  This test should be run by 'super-user' (root) only.
     65  *
     66  */
     67 #include <unistd.h>
     68 #include <sys/types.h>
     69 #include <errno.h>
     70 #include <fcntl.h>
     71 #include <sys/time.h>
     72 #include <sys/resource.h>
     73 
     74 #include "test.h"
     75 
     76 #define	NICEINC		-12
     77 #define TEMPFILE	"temp_file"
     78 
     79 char *TCID = "nice01";
     80 int TST_TOTAL = 1;
     81 
     82 int Org_nice;			/* original priority of the test process */
     83 FILE *fp;
     84 
     85 void setup();			/* Main setup function of test */
     86 void cleanup();			/* cleanup function for the test */
     87 
     88 int main(int ac, char **av)
     89 {
     90 	int lc;
     91 	int New_nice;		/* priority of process after nice() */
     92 	int rval;
     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 		/*
    103 		 * Call nice(2) with an 'incr' parameter set
    104 		 * to a negative value.
    105 		 */
    106 		TEST(nice(NICEINC));
    107 
    108 		/* check return code */
    109 		if (TEST_RETURN == -1) {
    110 			tst_resm(TFAIL, "nice(%d) Failed, errno=%d : %s",
    111 				 NICEINC, TEST_ERRNO, strerror(TEST_ERRNO));
    112 			continue;
    113 		}
    114 
    115 		New_nice = getpriority(PRIO_PROCESS, 0);
    116 
    117 		/* Validate functionality of the nice() */
    118 		if (New_nice != (Org_nice + NICEINC)) {
    119 			tst_resm(TFAIL, "nice() fails to modify the "
    120 				 "priority of process");
    121 		} else {
    122 			tst_resm(TPASS, "Functionality of nice(%d) "
    123 				 "successful", NICEINC);
    124 		}
    125 
    126 		/* return the process to the original priority */
    127 		rval = nice(-NICEINC);
    128 
    129 	}
    130 
    131 	cleanup();
    132 	tst_exit();
    133 }
    134 
    135 /*
    136  * setup() - performs all ONE TIME setup for this test.
    137  *  	     Make sure the test process uid is super user.
    138  *  	     Get the current priority value.
    139  */
    140 void setup(void)
    141 {
    142 
    143 	tst_require_root();
    144 
    145 	tst_sig(NOFORK, DEF_HANDLER, cleanup);
    146 
    147 	TEST_PAUSE;
    148 
    149 	Org_nice = getpriority(PRIO_PROCESS, 0);
    150 }
    151 
    152 /*
    153  * cleanup() - performs all ONE TIME cleanup for this test at
    154  *             completion or premature exit.
    155  *  	       Remove the test directory and testfile created in the setup.
    156  */
    157 void cleanup(void)
    158 {
    159 
    160 }
    161