strace/tests/set_mempolicy.c

/*
 * Check decoding of set_mempolicy syscall.
 *
 * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "tests.h"
#include <sys/syscall.h>

#ifdef __NR_set_mempolicy

# include <errno.h>
# include <stdio.h>
# include <string.h>
# include <unistd.h>

# include "xlat.h"
# include "xlat/policies.h"

# define MAX_STRLEN 3
# define NLONGS(n) ((n + 8 * sizeof(long) - 2) \
		      / (8 * sizeof(long)))

static void
print_nodes(const unsigned long maxnode, unsigned int offset)
{
	unsigned int nlongs = NLONGS(maxnode);
	if (nlongs <= offset)
		nlongs = 0;
	else
		nlongs -= offset;
	const unsigned int size = nlongs * sizeof(long);
	unsigned long *const nodemask =
		tail_alloc(size ? size : (offset ? 1 : 0));
	memset(nodemask, 0, size);
	(void) tail_alloc(1);

	long rc = syscall(__NR_set_mempolicy, 0, nodemask, maxnode);
	int saved_errno = errno;

	fputs("set_mempolicy(MPOL_DEFAULT, ", stdout);

	if (nlongs) {
		putc('[', stdout);
		unsigned int i;
		for (i = 0; i < nlongs + offset; ++i) {
			if (i)
				fputs(", ", stdout);
			if (i < nlongs) {
				if (i >= MAX_STRLEN) {
					fputs("...", stdout);
					break;
				}
				printf("%#0*lx", (int) sizeof(long) * 2 + 2,
				       nodemask[i]);
			} else {
				printf("%p", nodemask + i);
				break;
			}
		}
		putc(']', stdout);
	} else {
		if (maxnode)
			printf("%p", nodemask);
		else
			printf("[]");
	}

	printf(", %lu) = ", maxnode);
	if (rc) {
		errno = saved_errno;
		printf("%ld %s (%m)\n", rc, errno2name());
	} else {
		puts("0");
	}
}

static void
test_offset(const unsigned int offset)
{
	unsigned long maxnode = get_page_size() * 8;

	print_nodes(maxnode, offset);
	print_nodes(maxnode + 1, offset);
	print_nodes(maxnode + 2, offset);

	maxnode = sizeof(long) * 8;
	print_nodes(0, offset);
	print_nodes(1, offset);
	print_nodes(2, offset);
	print_nodes(maxnode - 1, offset);
	print_nodes(maxnode    , offset);
	print_nodes(maxnode + 1, offset);
	print_nodes(maxnode + 2, offset);
	print_nodes(maxnode * 2 - 1, offset);
	print_nodes(maxnode * 2    , offset);
	print_nodes(maxnode * 2 + 1, offset);
	print_nodes(maxnode * 2 + 2, offset);
	print_nodes(maxnode * 3 - 1, offset);
	print_nodes(maxnode * 3    , offset);
	print_nodes(maxnode * 3 + 1, offset);
	print_nodes(maxnode * 3 + 2, offset);
	print_nodes(maxnode * 4 + 2, offset);
}

int
main(void)
{
	if (syscall(__NR_set_mempolicy, 0, 0, 0))
		perror_msg_and_skip("set_mempolicy");
	puts("set_mempolicy(MPOL_DEFAULT, NULL, 0) = 0");

	const unsigned long *nodemask = (void *) 0xfacefeedfffffffe;
	const unsigned long maxnode = (unsigned long) 0xcafef00dbadc0ded;
	long rc = syscall(__NR_set_mempolicy, 1, nodemask, maxnode);
	printf("set_mempolicy(MPOL_PREFERRED, %p, %lu) = %ld %s (%m)\n",
	       nodemask, maxnode, rc, errno2name());

	test_offset(0);
	test_offset(1);

	puts("+++ exited with 0 +++");
	return 0;
}

#else

SKIP_MAIN_UNDEFINED("__NR_set_mempolicy")

#endif