cannot read key when allocating shared memory

[hjr]

Hi,

i wanted to read key in the ipc_perm struct using shmctl; during compilation i get this error message âstruct ipc_permâ has no member named âkeyâ
Can anybody suggest?

          #include<stdio.h>
#include<stdlib.h>
#include<sys/shm.h>
#include<sys/stat.h>
#include<sys/ipc.h>

int main()
{

  char * shared_memory;
  int segment_id;
  struct shmid_ds buf;
                                                                                                                                                  
  int shmctl_return;
  int size = 2048;
  char mode[3];

  key_t key;


   key = ftok("/home2/hrodriques/prog.c", 'R');

   printf("key=%d\n",key);
  segment_id= shmget(IPC_PRIVATE,size,S_IRUSR|S_IWUSR); //allocate a shared //memory segment                                                                                        

  printf("SEGMENT ID = %d\n",segment_id);
  //Attach the shared-memory segment to its address //space.                                                                                                                        
  shared_memory=  (char *)shmat(segment_id,NULL,0);//atttach a shared memory //segment                                                                                              
  if((shmctl_return =shmctl(segment_id,IPC_STAT,&buf))==-1)
    printf("error");
  else{
    printf("success");
     printf("Size=%d\n",buf.shm_segsz);
     printf("Key=%d\n", buf.shm_perm.key);

     printf("Mode=%d\n",buf.shm_perm.mode);

    }       //Detach and remove the shared-memory //segment                                                                                                                         
              shmdt(shared_memory);
                    shmctl(segment_id,IPC_RMID,NULL);
  return 0;
}

[Codeplug]

The ipc_perm structure does not have a member named "key" according to Posix.
<sys/ipc.h>

gg