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

int main() {
	char msg[] = "hello world";

	int shmd = shm_open("/shmemory", O_RDWR | O_CREAT | O_TRUNC, 0755);
	ftruncate(shmd, strlen(msg));
	char* mem = mmap(NULL, strlen(msg) + 1, PROT_READ | PROT_WRITE, MAP_SHARED, shmd, 0);

	strncpy(mem, msg, strlen(msg) + 1);

	char buf[1024];
	strncpy(buf, mem, strlen(msg) + 1);
	write(1, buf, strlen(buf) + 1);

	close(shmd);
	shm_unlink("/shmemory");

	return 0;
}