gistfile1.cpp

#include <string>
#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <vector>

#include <sys/mman.h>
#include <unistd.h>

int main(int argc, char** argv)
{
	if(argc > 1)
	{
		std::cout<<"sbrk. press any key...\n";
		std::getchar();
		std::cout<<"sbrk(0)="<<sbrk(0)<<"\n";
		void * pp = mmap(sbrk(0), 4096, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
		std::cout<<"mmap=>"<<pp<<"\n";
	}
	std::cout<<"ready? press any key...\n";
	std::getchar();
	void * p0 = malloc(16);
	std::cout<<"p\'="<<p0<<"\n";
	free(p0);
	p0 = 0;
	std::vector<void*> chunks;
	for(int i = 0; i < 2048; ++i)
	{
		size_t len = 1*1024*1024;
		void * p = malloc(1*1024*1024);
		std::fill(reinterpret_cast<char*>(p), reinterpret_cast<char*>(p) + len, 0x01);
		std::cout<<"p["<<i<<"]="<<p<<"\n";
		chunks.push_back(p);
	}
	std::cout<<"use [pmap `pgrep a.out`] and press any key...\n";
	std::getchar();
	for(std::vector<void*>::iterator it = chunks.begin(); it != chunks.end(); ++it)
	{
		free(*it);
	}
	chunks.clear();
	return 0;
}