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#include <stdio.h>
#include "tests/sys_mman.h"
#include <stdlib.h>
#include <unistd.h>
/* The code testing MAP_HUGETLB huge pages is disabled by default,
as many distros do not have huge pages configured
by default.
To have e.g. 20 huge pages configured, do (as root)
echo 20 > /proc/sys/vm/nr_hugepages
Once this is done, uncomment the below, and recompile.
*/
//#define TEST_MAP_HUGETLB 1
/* Similarly, testing SHM_HUGETLB huge pages is disabled by default.
To have shmget/shmat big pages working, do (as root)
echo 500 > /proc/sys/vm/hugetlb_shm_group
where 500 is the groupid of the user that runs this test
Once this is done, uncomment the below, and recompile.
*/
//#define TEST_SHM_HUGETLB 1
// Size to use for huge pages
#define HUGESZ (4 * 1024 * 1024)
#ifdef TEST_MAP_HUGETLB
/* Ensure this compiles on pre 2.6 systems, or on glibc missing MAP_HUGETLB */
#ifndef MAP_HUGETLB
/* The below works for me on an f12/x86 linux */
#define MAP_HUGETLB 0x40000
#endif
#endif /* TEST_MAP_HUGETLB */
#ifdef TEST_SHM_HUGETLB
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/stat.h>
#ifndef SHM_HUGETLB
#define SHM_HUGETLB 04000
#endif
#endif /* TEST_SHM_HUGETLB */
static unsigned int pagesize;
#define PAGES 1024u
#define LEN (PAGES*pagesize)
static void *domap(size_t len, int addflags)
{
void *ret = mmap(0, len, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|addflags, -1, 0);
if (ret == (void *)-1) {
perror("mmap");
exit(1);
}
return ret;
}
/* unmap in pieces to exercise munmap more */
static void nibblemap(void *p)
{
int off;
int i;
off = (random() % LEN) & ~(pagesize-1);
for(i = 0; i < PAGES; i++) {
/* printf("unmapping off=%d\n", off/pagesize); */
munmap((char *)p + off, pagesize);
off += 619*pagesize;
off %= LEN;
}
}
static void prmaps()
{
char buf[100];
sprintf(buf, "/bin/cat /proc/%ld/maps", (long) getpid());
system(buf);
exit(1);
}
int main()
{
int i;
void *expect1, *expect2;
pagesize = getpagesize();
expect1 = domap(LEN, 0);
expect2 = domap(LEN, 0);
munmap(expect1, LEN);
munmap(expect2, LEN);
for(i = 0; i < 5; i++) {
void *m1, *m2;
m1 = domap(LEN, 0);
if (m1 != expect1) {
printf("FAIL i=%d: m1=%p expect1=%p\n",
i, m1, expect1);
prmaps();
return 1;
}
m2 = domap(LEN, 0);
if (m2 != expect2) {
printf("FAIL i=%d: m2=%p expect2=%p\n",
i, m2, expect2);
prmaps();
return 1;
}
nibblemap(m2);
munmap(m1, LEN);
}
#ifdef TEST_MAP_HUGETLB
{
void *expect3;
expect3 = domap(HUGESZ, MAP_HUGETLB);
munmap(expect3, HUGESZ);
}
#endif
#ifdef TEST_SHM_HUGETLB
{
int shmid;
void *expect4;
shmid = shmget(IPC_PRIVATE, HUGESZ,
IPC_CREAT | IPC_EXCL | S_IRUSR | S_IWUSR | SHM_HUGETLB);
if (shmid == -1) {
perror("shmget");
exit(1);
}
expect4 = shmat(shmid, NULL, 0);
if (expect4 == (void*) -1){
perror("shmat");
exit(1);
}
if (shmdt(expect4) != 0) {
perror("shmdt");
exit(1);
}
if (shmctl(shmid, IPC_RMID, 0) != 0) {
perror("shmctl IPC_RMID");
exit(1);
}
}
#endif
printf("PASS\n");
return 0;
}
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