testcases/open_posix_testsuite/conformance/interfaces/mmap/24-1.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 mmap() function shall fail if:
 * [ENOMEM] MAP_FIXED was specified, and the range [addr,addr+len)
 * exceeds that allowed for the address space of a process;
 * or, if MAP_FIXED was not specified and
 * there is insufficient room in the address space to effect the mapping.
 *
 * Test Steps:
 * 1. In a very long loop, keep mapping a shared memory object,
 *    until there this insufficient room in the address space;
 * 3. Should get ENOMEM.
 */

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

int main(void)
{
	char tmpfname[256];
	void *pa;
	size_t len;
	int fd;

	/* Size of the shared memory object */
	size_t shm_size = 1024;

	size_t mapped_size = 0;

	snprintf(tmpfname, sizeof(tmpfname), "pts_mmap_25_1_%d", getpid());

	/* Create shared object */
	shm_unlink(tmpfname);
	fd = shm_open(tmpfname, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
	if (fd == -1) {
		printf("Error at shm_open(): %s\n", strerror(errno));
		return PTS_UNRESOLVED;
	}
	shm_unlink(tmpfname);

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

	len = shm_size;

	mapped_size = 0;
	while (mapped_size < SIZE_MAX) {
		pa = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
		if (pa == MAP_FAILED && errno == ENOMEM) {
			printf("Total mapped size is %lu bytes\n",
			       (unsigned long)mapped_size);
			printf("Test PASSED\n");
			return PTS_PASS;
		}

		mapped_size += shm_size;
		if (pa == MAP_FAILED)
			perror("Error at mmap()");
	}

	close(fd);
	printf("Test FAILED: Did not get ENOMEM as expected\n");
	return PTS_FAIL;
}