xoxo.c

three proceses , one proces read some mesages entered from the keyboard until read s EXIT, the the s

#include <stdio.h>


       #include <sys/types.h>
       #include <unistd.h>


#include <sys/ipc.h>
#include <sys/shm.h>
#include <string.h>

#define SHMSZ     27




int main()
{

	int shmid;
	int *shm;
	key_t key;
	key =ftok("./",1);
	if((shmid=shmget(key,SHMSZ,IPC_CREAT | 0666))<0){
		perror("shmget");
		return 1;
	}
	if ((shm=shmat(shmid,NULL,0))==(int *) -1){
		perror("shmat");
		return 1;
	}
	
	*shm=0;







switch(fork()){
	case -1: {
		perror("eroare fork\n");
		break;
		}
	case 0:{ 
		printf("%d - fiu\n",getpid());


		switch(fork()){
		case -1: {
			perror("eroare fork\n");
			break;
			}
		case 0:{ 
			printf("%d - nepot\n",getpid());
			char *str;
			strcpy(str,"GOL");
			while (strcmp(str,"EXIT")!=0)
			{
				printf("mesaj \n");
				scanf("%s",str);
			}
			int nepot_id=getpid();
			*shm=nepot_id;

			
			break;
			}
		default:{
			//fiuuuuuuuuuuuuuuuuuuuuuuuuuuuu
			char *u;
			while (*shm == 0)
				sleep(1);
			kill(*shm,9);
			printf("nepot killarit la pid %d \n",*shm);
			*shm=getpid();
			kill(getpid(),9);
		//	printf("tata homorat \n");
			break;
			}
		}
		break;
		}
	default:{
		printf("%d - tata\n",getpid());
		sleep(2);
		/*if (*shm!=0)
		printf("tata killarit la pid %d \n",*shm);
	*/	break;
		}
}
sleep(10);
return 0; 
}