// commit 5446303328adf4b4e36d9fba21848e6feb55fab4 2014-04-02

// malloc should not fail if brk fails but mmap can still allocate

#include <stdlib.h>

#include <errno.h>

#include <string.h>

#include <sys/mman.h>

#include <sys/resource.h>

#include "test.h"

#define T(f) ((f)==0 || (t_error(#f " failed: %s\n", strerror(errno)), 0))

int main(void)

{

	void *p;

	void *q;

	size_t n;

	int r;

	// fill memory, largest mmaped area is [p,p+n)

	if (t_vmfill(&p, &n, 1) < 1 || n < 2*65536) {

		t_error("vmfill failed\n");

		return 1;

	}

	// malloc should fail here

	errno = 0;

	q = malloc(10000);

	if (q)

		t_error("malloc(10000) succeeded after memory is filled\n");

	else if (errno != ENOMEM)

		t_error("malloc did not fail with ENOMEM, got %s\n", strerror(errno));

	// make space available for mmap, but ensure it's not contiguous with brk

	T(munmap((char*)p+65536, n-65536));

	// malloc should succeed now

	q = malloc(10000);

	if (!q)

		t_error("malloc(10000) failed (eventhough 64k is available to mmap): %s\n", strerror(errno));

	return t_status;

}