mapper.c
dougm (Doug Moore)
Actions

Authored By

	dougm
	May 18 2019, 7:43 AM

Size

588 B

Referenced Files

None

Subscribers

None

mapper.c
View Options

	#include <sys/mman.h>
	#include <stdlib.h>
	#include <stdio.h>

	enum {MAX_MAPS = 16384, MAP_SIZE = 4096 };

	void *mappings[MAX_MAPS];

	int main()
	{
	int i;
	int nmappings = 0;
	for (i = 0; i < 128 * MAX_MAPS; ++i) {
	long r = random() % MAX_MAPS;
	if (mappings[r] == NULL) {
	mappings[r] = mmap(0, MAP_SIZE, PROT_WRITE, MAP_ALIGNED(13) \| MAP_ANON, -1, 0);
	if (mappings[r] != NULL)
	++nmappings;
	} else {
	munmap(mappings[r], MAP_SIZE);
	mappings[r] = 0;
	--nmappings;
	}
	}
	printf("nmappings = %d; ok?\n", nmappings);
	getchar();
	return 0;
	}