test linux virtual memory max size

/**

* $Id: mmap.cpp 1595 2012-07-28 10:33:18Z shijia.wxr $

*/

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/mman.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <unistd.h>

#include <sys/types.h>

 

#define MMAP_FILE_SIZE (1024 * 1024 * 1024)

 

int main(int argc, char** argv)

{

int i = 0;

 

for(i = 1; ; i++) {

char filePath[64] = {0};

sprintf(filePath, "%d", i);

int fd = open(filePath, O_RDWR | O_CREAT);

if(fd < 0) {

printf("open failed\n");

break;

}

ftruncate(fd, MMAP_FILE_SIZE);

 

void* p = mmap(0, MMAP_FILE_SIZE, PROT_WRITE, MAP_SHARED,fd, 0);

if(p != 0) {

memset(p, 0, MMAP_FILE_SIZE);

printf("mmap OK, %d\n", i);

} else {

printf("mmap Failed, exit.\n");

break;

}

}

 

while (1) {

printf("sleeping\n");

sleep(1);

}

 

return 0;

}