#ifndef _S390_MSGBUF_H
  #define _S390_MSGBUF_H
  
  /* 
   * The msqid64_ds structure for S/390 architecture.
   * Note extra padding because this structure is passed back and forth
   * between kernel and user space.
   *
   * Pad space is left for:
   * - 64-bit time_t to solve y2038 problem
   * - 2 miscellaneous 32-bit values
   */
  
  struct msqid64_ds {
  	struct ipc64_perm msg_perm;
  	__kernel_time_t msg_stime;	/* last msgsnd time */
  #ifndef __s390x__
  	unsigned long	__unused1;
  #endif /* ! __s390x__ */
  	__kernel_time_t msg_rtime;	/* last msgrcv time */
  #ifndef __s390x__
  	unsigned long	__unused2;
  #endif /* ! __s390x__ */
  	__kernel_time_t msg_ctime;	/* last change time */
  #ifndef __s390x__
  	unsigned long	__unused3;
  #endif /* ! __s390x__ */
  	unsigned long  msg_cbytes;	/* current number of bytes on queue */
  	unsigned long  msg_qnum;	/* number of messages in queue */
  	unsigned long  msg_qbytes;	/* max number of bytes on queue */
  	__kernel_pid_t msg_lspid;	/* pid of last msgsnd */
  	__kernel_pid_t msg_lrpid;	/* last receive pid */
  	unsigned long  __unused4;
  	unsigned long  __unused5;
  };
  
  #endif /* _S390_MSGBUF_H */