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/* $OpenBSD: mmap_size.c,v 1.2 2006/03/14 09:31:51 mickey Exp $ */
/*
* Public domain. 2005, Otto Moerbeek <otto@drijf.net>
*/
#include <sys/types.h>
#include <sys/mman.h>
#include <err.h>
#include <limits.h>
#include <stdlib.h>
#include <stdio.h>
void
f(size_t sz)
{
char *p;
p = mmap(NULL, sz, PROT_READ|PROT_WRITE,
MAP_ANON|MAP_PRIVATE, -1, (off_t)0);
if (p == MAP_FAILED)
return;
if (sz > 0) {
p[0] = 0;
p[sz / 2] = 0;
p[sz - 1] = 0;
}
munmap(p, sz);
}
int
main()
{
size_t i;
for (i = 0; i < 0x2000; i += 0x100) {
f(i);
f(-i);
f(SIZE_T_MAX/2 - 0x1000);
}
return (0);
}
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