/*
 * A simple testee program
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <string.h>

#include <sys/wait.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <fcntl.h>

#include <sched.h>

int main(int argc, char *argv[])
{
//	int pipefd[2];
	int fd_shared, fd_private;
	const char data_mark[] = "This is a data_mark marker";
	void *mmap_shared, *mmap_private, *mmap_anon, *map_unreadable;
	void *mmap_anon_shared;
	const char sep[] = "----------";
	unsigned long buf;
	int i;

	(void)data_mark;

	printf("%s pid %d\n", argv[0], getpid());

//	if (pipe(pipefd)) {
//		perror("Can't create pipe");
//		goto err;
//	}

	fd_shared = open("testee-shared.img", O_RDWR | O_CREAT | O_TRUNC, 0600);
	if (fd_shared < 0) {
		perror("Can't open fd_shared file");
		goto err;
	}

	fd_private = open("testee-private.img", O_RDWR | O_CREAT | O_TRUNC, 0600);
	if (fd_private < 0) {
		perror("Can't open fd_private file");
		goto err;
	}

	if (lseek(fd_shared, 1024, SEEK_SET) == -1 ||
	    lseek(fd_private, 1024, SEEK_SET) == -1) {
		perror("Can't llsek");
		goto err;
	}

	write(fd_shared, "", 1);
	write(fd_private, "", 1);

	mmap_shared	= mmap(NULL, 1024, PROT_READ | PROT_WRITE, MAP_FILE | MAP_SHARED, fd_shared, 0);
	mmap_private	= mmap(NULL, 1024, PROT_READ | PROT_WRITE, MAP_FILE | MAP_PRIVATE, fd_private, 0);
	mmap_anon	= mmap(NULL, 1024, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
	map_unreadable	= mmap(NULL, 1024, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
	mmap_anon_shared= mmap(NULL, 1024, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_SHARED, -1, 0);

	if (mmap_shared		== MAP_FAILED ||
	    mmap_private	== MAP_FAILED ||
	    mmap_anon_shared	== MAP_FAILED ||
	    mmap_anon		== MAP_FAILED ||
	    map_unreadable	== MAP_FAILED) {

		perror("mmap failed");
		goto err;
	}

	strcpy((char *)mmap_shared,	sep);
	strcpy((char *)mmap_private,	sep);
	strcpy((char *)mmap_anon,	sep);
	strcpy((char *)map_unreadable,	sep);
	strcpy((char *)mmap_anon_shared,sep);

	for (i = 64; i < 128; i++) {
		((char *)mmap_shared)[i]	=   0 + i;
		((char *)mmap_private)[i]	=  64 + i;
		((char *)mmap_anon)[i]		= 128 + i;
		((char *)map_unreadable)[i]	= 190 + i;
		((char *)mmap_anon_shared)[i]	=   0 + i;
	}

	if (mprotect(map_unreadable, 1024, PROT_NONE)) {
		perror("mprotect failed");
		goto err;
	}

	asm volatile("" ::: "memory");

	fsync(fd_shared);
	fsync(fd_private);

	sync();
	asm volatile("" ::: "memory");

	while (1) {
		printf("ping: %d\n", getpid());
//		write(pipefd[1], &buf, sizeof(buf));
		sleep(6);
	}

err:
	/* resources are released by kernel */
	return 0;
}