#ifndef __ASM_GENERIC_IPCBUF_H
  #define __ASM_GENERIC_IPCBUF_H
  
  /*
   * The generic ipc64_perm structure:
   * Note extra padding because this structure is passed back and forth
   * between kernel and user space.
   *
   * ipc64_perm was originally meant to be architecture specific, but
   * everyone just ended up making identical copies without specific
   * optimizations, so we may just as well all use the same one.
   *
   * Pad space is left for:
   * - 32-bit mode_t on architectures that only had 16 bit
   * - 32-bit seq
   * - 2 miscellaneous 32-bit values
   */
  
  struct ipc64_perm {
  	__kernel_key_t		key;
  	__kernel_uid32_t	uid;
  	__kernel_gid32_t	gid;
  	__kernel_uid32_t	cuid;
  	__kernel_gid32_t	cgid;
  	__kernel_mode_t		mode;
  				/* pad if mode_t is u16: */
  	unsigned char		__pad1[4 - sizeof(__kernel_mode_t)];
  	unsigned short		seq;
  	unsigned short		__pad2;
  	unsigned long		__unused1;
  	unsigned long		__unused2;
  };
  
  #endif /* __ASM_GENERIC_IPCBUF_H */