testcases/kernel/syscalls/iopl/iopl01.c

/*
 * Copyright (c) Wipro Technologies Ltd, 2002.  All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 */
/**********************************************************
 *
 *    TEST IDENTIFIER	: iopl01
 *
 *    EXECUTED BY	: superuser
 *
 *    TEST TITLE	: Basic test for iopl(2)
 *
 *    TEST CASE TOTAL	: 4
 *
 *    AUTHOR		: Subhab Biswas <subhabrata.biswas@wipro.com>
 *
 *    SIGNALS
 * 	Uses SIGUSR1 to pause before test if option set.
 * 	(See the parse_opts(3) man page).
 *
 *    DESCRIPTION
 *	This is a Phase I test for the iopl(2) system call.
 *	It is intended to provide a limited exposure of the system call.
 *
 * 	Setup:
 * 	  Setup signal handling.
 *	  Test caller is superuser
 *	  Pause for SIGUSR1 if option specified.
 *
 * 	Test:
 *	 Loop if the proper options are given.
 * 	  Execute system call
 *        Check return code, if system call failed (return=-1)
 *              Issue FAIL message with errno.
 *        Otherwise, Issue PASS message.
 *
 * 	Cleanup:
 * 	  Print errno log and/or timing stats if options given
 *
 * USAGE:  <for command-line>
 * iopl01 [-c n] [-e] [-i n] [-I x] [-P x] [-t] [-h] [-f] [-p]
 *			where,  -c n : Run n copies concurrently.
 *				-e   : Turn on errno logging.
 *				-h   : Show help screen
 *				-f   : Turn off functional testing
 *				-i n : Execute test n times.
 *				-I x : Execute test for x seconds.
 *				-p   : Pause for SIGUSR1 before starting
 *				-P x : Pause for x seconds between iterations.
 *				-t   : Turn on syscall timing.
 *
 ****************************************************************/

char *TCID = "iopl01";

#if defined __i386__ || defined(__x86_64__)

#include <errno.h>
#include <unistd.h>
#include <sys/io.h>

#include "test.h"

static void setup();
static void cleanup();

int TST_TOTAL = 4;

int level;			/* I/O privilege level of the process */

int main(int ac, char **av)
{

	int lc;
	const char *msg;

	if ((msg = parse_opts(ac, av, NULL, NULL)) != NULL)
		tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);

	setup();

	for (lc = 0; TEST_LOOPING(lc); lc++) {

		tst_count = 0;

		/*
		 * Test the system call for possible privelege levels.
		 * As the privelge level for a normal process is 0,
		 * start by setting/changing the level to 0.
		 */
		for (level = 0; level < TST_TOTAL; ++level) {

			TEST(iopl(level));

			if (TEST_RETURN == -1) {
				tst_resm(TFAIL, "iopl() failed for level %d, "
					 "errno=%d : %s", level,
					 TEST_ERRNO, strerror(TEST_ERRNO));
			} else {
				tst_resm(TPASS, "iopl() passed for level %d, "
					 "returned %ld", level, TEST_RETURN);
			}
		}
	}

	/* cleanup and exit */
	cleanup();
	tst_exit();

}

/* setup() - performs all ONE TIME setup for this test */
void setup(void)
{
	tst_require_root(NULL);

	tst_sig(NOFORK, DEF_HANDLER, cleanup);

	TEST_PAUSE;

}

/*
 *cleanup() -  performs all ONE TIME cleanup for this test at
 *		completion or premature exit.
 */
void cleanup(void)
{

	/*
	 * back to I/O privilege for normal process.
	 */
	if (iopl(0) == -1) {
		tst_resm(TWARN, "iopl() cleanup failed");
	}

}

#else /* __i386__ */

#include "test.h"

int TST_TOTAL = 0;

int main(void)
{
	tst_resm(TPASS,
		 "LSB v1.3 does not specify iopl() for this architecture.");
	tst_exit();
}

#endif /* __i386__ */