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/* $OpenBSD: mmap_fixed.c,v 1.1.1.1 2006/04/06 20:39:03 kurt Exp $ */
/*
* Public domain. 2006, Kurt Miller <kurt@intricatesoftware.com>
*/
#include <sys/types.h>
#include <sys/mman.h>
#include <err.h>
#define MEM_SIZE 1024*1024
/*
* Repetitively call mmap with MMAP_FIXED on the same region of memory
* to ensure process datasize is properly calculated.
*/
int
main(void)
{
void *mem_area;
int i;
mem_area = mmap(0, MEM_SIZE, PROT_NONE, MAP_ANON, -1, 0);
for (i = 0; i < 20000; i++) {
if (mmap(mem_area, MEM_SIZE, PROT_READ|PROT_WRITE|PROT_EXEC,
MAP_ANON|MAP_FIXED, -1, 0) == MAP_FAILED)
err(1, NULL);
}
return (0);
}
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