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Old stuff/ecole_etude_fac_de_pau/licence_3/systeme-d-exploitation/tp4/exo1.c

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <errno.h>
#include <string.h>
#include <signal.h>


void fonction(int n)
{
  char* test;
  key_t cle= ftok("./prout",0);  
  int id;
       id = shmget(cle,0,0);
      if (id == -1)
	{
	  perror("shmget");
	  exit(-1);
	}
      //      printf("Id = %d\n",id);
      test = (char*)shmat(id,0, 0);
      printf("On lit %s\n",test);
      shmdt(test);   
  exit(-1);
}


int main(int argc, char** argv)
{
   pid_t pid;
  char* test=NULL;
  key_t cle= ftok("./prout",0);
  int id;
  const char source[] = "salut";


  pid= fork();
  if (pid == -1) { 
    perror("fork");
    exit(-1);
  }
  else if(pid == 0)
    {
      struct sigaction action;
      action.sa_handler = fonction;
      sigemptyset(&action.sa_mask);
      if(sigaction(SIGUSR1,&action,NULL) == -1)
	{ 
	  perror("Erreur sigaction SIGALRM\n");
	  exit(-1);
	}
      while(1) { sleep(1); }
    }
  else
    {
      /* Synchro */
 
      id = shmget(cle,100*sizeof(char),IPC_CREAT|IPC_EXCL|0777);
      if (id == -1)
	{
	  perror("shmget");
	  exit(-1);
	}
      //     printf("Id = %d\n",id);
      test = (char*)shmat(id,0, 0);
      if ((int)test == -1) { perror("error shmat");  exit(-1); }

	//	printf("Adresse %d\n",test);
	memcpy(test,source,sizeof(source)+1);
	printf("On ecrit : %s\n",test);

	kill(pid,SIGUSR1);
	wait();
	shmdt(test);
	shmctl(id, IPC_RMID, NULL);
    }

  return 1;
}