#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <string.h>
#include <unistd.h>
#define MAX 256
int CTRL=0, SEND=0, RECV = 0;
 
typedef unsigned short int ushort;

typedef struct {
   long  type;
  char data[MAX];
} message;

//mark=main
//kwds=ftok, msgget,msgsnd, msgrecv, mesgctl
//capt=Envoyer un message
int main(int argc, char* argv[] )
{ int opt, type;
  char *optlist ="cd:r:s:";
  key_t key;
  message msg;
  int file;
  while ( ( opt = getopt( argc, argv , optlist) ) > 0  )
	  switch( opt ){
	  case 'r': RECV = 1;       type = atoi( optarg ); break;
	  case 's': SEND = 1; msg . type = atoi( optarg ); break;
	  case 'c': CTRL = 1;                              break;
	  case 'd': strncpy( msg . data, optarg, MAX );  ; break;     
	  default : printf("\nusage %s : %s", argv[0], optlist); 
	            exit ( 1 );
	  }

  if ( ( key = ftok( argv[0], 0 )) == -1  )
    perror("ftok"), exit( 1 );

  if ( ( file = msgget( key, IPC_CREAT | 0600 ) ) == -1 )
    perror("msget"), exit( 1 );
   
  if ( SEND ) {
	  if ( msgsnd( file, ( void*) & msg, MAX , 0 ) < 0 ) 
             perror("msgsnd"), exit(1);
  }
  if ( RECV ) {
    if ( msgrcv( file, ( void*) & msg, MAX , type, 0 ) >= 0 )
       printf("type=%ld data=%s", msg . type, msg . data);
    else perror("msgrecv"), exit(1);
  }
  
  if ( CTRL )
       msgctl( file, IPC_RMID, NULL);
  printf("\n");
  return 0;
}