vforktest.c

// gcc -Wall -pthread -o vforktest vforktest.c
#include <stdio.h>
#include <pthread.h>
#include <unistd.h>
#include <sys/types.h>

static void* run (void* arg)
{
	for (int i = 0; i < 6; ++i) {
		printf ("Test %d\n", i);
		sleep (1);
	}
	return 0;
}

int main (int argc, char** argv)
{
	pthread_t tid;
	pthread_create (&tid, NULL, &run, NULL);

	int pid = vfork ();
	sleep (3);

	if (pid == 0) {
		execlp ("/bin/ls", "ls", (char*)NULL);
	}

	sleep (3);

	pthread_join (tid, NULL);
	return 0;
}