lololol

#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <unistd.h>
#include <sys/wait.h>

int main(){
	unsigned int semid;
	struct sembuf up1 = {0, 1, 0}; //number, operation, flag
	struct sembuf down1 = {0, -1, 0}; //number, operation, flag
	struct sembuf up2 = {1, 1, 0};
	struct sembuf down2 = {1, -1, 0};

	semid = semget(IPC_PRIVATE, 2, 0666|IPC_CREAT);//crée 1 sémaphore
	semctl(semid, 0, SETVAL, 0); //initialise la valeur à 0 sur le premier sémaphore
	semctl(semid, 1, SETVAL, 0);
	int i = 0;;
	int PID = fork();

	if (PID == 0)
	{
		for(i=0;i<5;i++)
		{
			printf("COUCOU C'EST LE FILS\n");
			semop(semid, &up1, 1);
			semop(semid, &down2, 1);
		}
	}
	else
	{
		for(i=0;i<5;i++)
		{
		semop(semid, &down1, 1);
		printf(" %d \n",i+1);
		semop(semid, &up2, 1);
		}
		//effectue un up (operation 1)
	}

	semctl(semid, 0, IPC_RMID);
	semctl(semid, 1, IPC_RMID);
	return 0;
}