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	markj
	Sep 24 2019, 9:15 PM

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	#include <sys/param.h>
	#include <sys/mman.h>
	#include <sys/stat.h>

	#include <fcntl.h>
	#include <err.h>
	#include <stdlib.h>
	#include <stdio.h>
	#include <unistd.h>

	int
	main(int argc, char **argv)
	{
	char template[PATH_MAX];
	void *addr;
	size_t sz;
	int fd;

	sz = 16 * 4096;

	(void)snprintf(template, sizeof(template), "test.XXXXXX");
	fd = mkstemp(template);
	if (fd < 0)
	err(1, "mkostemp");
	if (fchmod(fd, 0700) < 0)
	err(1, "fchmod");
	if (ftruncate(fd, sz) < 0)
	err(1, "ftruncate");

	addr = mmap(NULL, sz, PROT_MAX(PROT_READ) \| PROT_READ, MAP_SHARED, fd, 0);
	if (addr == MAP_FAILED)
	err(1, "mmap");

	if (mlock(addr, sz) != 0)
	err(1, "mlock");

	if (ftruncate(fd, 0) != 0)
	err(1, "ftruncate");
	if (ftruncate(fd, sz) != 0)
	err(1, "ftruncate");

	(void)close(fd);

	fd = open(template, O_EXEC);
	if (fd < 0)
	err(1, "open");
	fexecve(fd, argv, NULL);
	err(1, "fexecve");

	return (0);
	}