bulix.org / pastebin

Paste #81986: Untitled C paste by 203.114.244.88

/*
 *
 *   Copyright (c) International Business Machines  Corp., 2004
 *
 *   This program is free software;  you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program;  if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

/*
 * Test Name: hugemmap03
 *
 * Test Description: Test that a normal page cannot be mapped into a high
 * memory region.
 *
 * HISTORY
 *  04/2004 Written by Robbie Williamson
 *
 * RESTRICTIONS:
 *  Must be compiled in 64-bit mode.
 */

#include <sys/types.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "test.h"
#include "usctest.h"
#include "safe_macros.h"
#include "mem.h"

char *TCID = "hugemmap03";
int TST_TOTAL = 1;

#define HIGH_ADDR	(void *)(0x1000000000000)

static unsigned long *addr;
static int  fildes;
static long hugepages = 128;
static long orig_hugepages;
static long map_sz;
static char TEMPFILE[MAXPATHLEN];

static char *Hopt, *nr_opt;
static int  Hflag, sflag;
static option_t options[] = {
	{ "H:",	&Hflag,	&Hopt },
	{ "s:",	&sflag,	&nr_opt },
	{ NULL,	NULL,	NULL }
};

static void help(void);

int main(int ac, char **av)
{
	int lc;
	char *msg;

#if __WORDSIZE == 32
	tst_brkm(TCONF, NULL, "This test is only for 64bit");
#endif

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

	if (!Hflag) {
		tst_tmpdir();
		Hopt = get_tst_tmpdir();
	}
	if (sflag)
		hugepages = SAFE_STRTOL(NULL, nr_opt, 0, LONG_MAX);

	setup();

	map_sz = read_meminfo("Hugepagesize:") * 1024;

	for (lc = 0; TEST_LOOPING(lc); lc++) {
		fildes = open(TEMPFILE, O_RDWR | O_CREAT, 0666);
		if (fildes < 0)
			tst_brkm(TBROK|TERRNO, cleanup, "open %s", TEMPFILE);

		Tst_count = 0;

		/* Attempt to mmap into highmem addr, should get ENOMEM */
		addr = mmap(HIGH_ADDR, map_sz, PROT_READ,
			    MAP_SHARED | MAP_FIXED, fildes, 0);
		if (addr != MAP_FAILED) {
			tst_resm(TFAIL, "mmap into high region "
					"succeeded unexpectedly");
			goto fail;
		}
		if (errno != ENOMEM)
			tst_resm(TFAIL|TERRNO, "mmap into high region "
					"failed unexpectedly - expect "
					"errno=ENOMEM, got");
		else
			tst_resm(TPASS|TERRNO, "mmap into high region "
					"failed as expected");
fail:
		close(fildes);
	}
	cleanup();
	tst_exit();
}

void setup(void)
{
	tst_require_root(NULL);

	if (mount("none", Hopt, "hugetlbfs", 0, NULL) < 0)
		tst_brkm(TBROK|TERRNO, NULL,
			 "mount failed on %s", Hopt);

	orig_hugepages = get_sys_tune("nr_hugepages");
	set_sys_tune("nr_hugepages", hugepages, 1);

	snprintf(TEMPFILE, sizeof(TEMPFILE), "%s/mmapfile%d",
		 Hopt, getpid());

	TEST_PAUSE;
}

void cleanup(void)
{
	TEST_CLEANUP;

	unlink(TEMPFILE);
	set_sys_tune("nr_hugepages", orig_hugepages, 0);
	umount(Hopt);

	if (!Hflag)
		tst_rmdir();
}

static void help(void)
{
	printf("  -H /..  Location of hugetlbfs, i.e. -H /var/hugetlbfs\n");
	printf("  -s num  Set the number of the been allocated hugepages\n");
}