/*
* libhugetlbfs - Easy use of Linux hugepages
* Copyright (C) 2005-2006 David Gibson & Adam Litke, IBM Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <sys/types.h>
#include <sys/shm.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <hugetlbfs.h>
#include "hugetests.h"
extern int errno;
/* Global Configuration */
#define P "shm-gettest"
#define DESC \
"* A looping test to verify the functionality of large page backed *\n"\
"* shared memory segments. A segment is created, written, *\n"\
"* verified, and detached a specified number of times. *"
static unsigned int iter;
static int nr_hugepages;
static int shmid = -1;
static long hpage_size;
void cleanup(void)
{
remove_shmid(shmid);
}
static void do_one(size_t size) {
size_t i,j;
char pattern;
char *shmaddr;
verbose_printf("Requesting %zu bytes\n", size);
if ((shmid = shmget(2, size, SHM_HUGETLB|IPC_CREAT|SHM_R|SHM_W )) < 0)
FAIL("shmget(): %s", strerror(errno));
verbose_printf("shmid: 0x%x\n", shmid);
shmaddr = shmat(shmid, 0, SHM_RND) ;
if (shmaddr == MAP_FAILED)
FAIL("shmat(): %s", strerror(errno));
verbose_printf("shmaddr: %p\n", shmaddr);
for (i = 0; i < nr_hugepages; i++) {
pattern = 65+(i%26);
verbose_printf("Touching %p with %c\n", shmaddr+(i*hpage_size),pattern);
memset(shmaddr+(i*hpage_size), pattern, hpage_size);
}
for (i = 0; i < nr_hugepages; i++) {
pattern = 65+(i%26);
verbose_printf("Verifying %p\n", (shmaddr+(i*hpage_size)));
for (j = 0; j < hpage_size; j++)
if (*(shmaddr+(i*hpage_size)+j) != pattern)
FAIL("Verifying the segment failed. "
"Got %c, expected %c",
*(shmaddr+(i*hpage_size)+j), pattern);
}
if (shmdt((const void *)shmaddr) != 0)
FAIL("shmdt(): %s", strerror(errno));
}
int main(int argc, char ** argv)
{
size_t size;
int i;
test_init(argc, argv);
if (argc < 3)
CONFIG("Usage: shmgettest <# iterations> <# pages>\n");
check_hugetlb_shm_group();
iter = atoi(argv[1]);
nr_hugepages = atoi(argv[2]);
hpage_size = gethugepagesize();
size = nr_hugepages * hpage_size;
for (i=0; i < iter; i++)
do_one(size);
PASS();
}