xref: /external/ltp/testcases/open_posix_testsuite/conformance/interfaces/mmap/11-1.c

/*
 * Copyright (c) 2002, Intel Corporation. All rights reserved.
 * Copyright (c) 2012, Cyril Hrubis <chrubis@suse.cz>
 *
 * This file is licensed under the GPL license.  For the full content
 * of this license, see the COPYING file at the top level of this
 * source tree.
 *
 * The off argument is constrained to be aligned and sized
 * according to the value returned by
 * sysconf() when passed _SC_PAGESIZE or _SC_PAGE_SIZE.
 *
 * The mmap() function shall fail if: [EINVAL] The addr argument (if MAP_FIXED
 * was specified) or off is not a multiple of the page size as returned by
 * sysconf(), or is considered invalid by the implementation.
 *
 * Test Steps:
 * 1. Set 'off' a value which is not a multiple of page size;
 * 2. Call mmap() and get EINVAL;
 *
 */

#define _XOPEN_SOURCE 600

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include "posixtest.h"

int main(void)
{
	char tmpfname[256];
	long page_size;
	long total_size;

	void *pa;
	size_t size;
	int fd, saved_errno;
	off_t off;

	page_size = sysconf(_SC_PAGE_SIZE);
	total_size = 3 * page_size;
	size = page_size;

	snprintf(tmpfname, sizeof(tmpfname), "/tmp/pts_mmap_11_1_%d", getpid());
	unlink(tmpfname);
	fd = open(tmpfname, O_CREAT | O_RDWR | O_EXCL, S_IRUSR | S_IWUSR);
	if (fd == -1) {
		printf("Error at open(): %s\n", strerror(errno));
		return PTS_UNRESOLVED;
	}
	unlink(tmpfname);

	if (ftruncate(fd, total_size) == -1) {
		printf("Error at ftruncate(): %s\n", strerror(errno));
		return PTS_UNRESOLVED;
	}

	/* This offset is considered illegal, not a multiple of page_size,
	 * unless the page_size is 1 byte, which is considered impossible.
	 */
	off = page_size + 1;
	errno = 0;
	pa = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, off);

	saved_errno = errno;

	close(fd);
	munmap(pa, size);

	if (pa == MAP_FAILED && saved_errno == EINVAL) {
		printf("Got EINVAL when 'off' is not multiple of page size\n");
		printf("Test PASSED\n");
		return PTS_PASS;
	}

	printf("Test FAILED: Did not get EINVAL"
	       " when 'off' is not a multiple of page size, get: %s\n",
	       strerror(saved_errno));

	return PTS_FAIL;
}