include/uapi/asm-generic/ipcbuf.h

   1 #ifndef __ASM_GENERIC_IPCBUF_H
   2 #define __ASM_GENERIC_IPCBUF_H
   3
   4 /*
   5  * The generic ipc64_perm structure:
   6  * Note extra padding because this structure is passed back and forth
   7  * between kernel and user space.
   8  *
   9  * ipc64_perm was originally meant to be architecture specific, but
  10  * everyone just ended up making identical copies without specific
  11  * optimizations, so we may just as well all use the same one.
  12  *
  13  * Pad space is left for:
  14  * - 32-bit mode_t on architectures that only had 16 bit
  15  * - 32-bit seq
  16  * - 2 miscellaneous 32-bit values
  17  */
  18
  19 struct ipc64_perm {
  20         __kernel_key_t          key;
  21         __kernel_uid32_t        uid;
  22         __kernel_gid32_t        gid;
  23         __kernel_uid32_t        cuid;
  24         __kernel_gid32_t        cgid;
  25         __kernel_mode_t         mode;
  26                                 /* pad if mode_t is u16: */
  27         unsigned char           __pad1[4 - sizeof(__kernel_mode_t)];
  28         unsigned short          seq;
  29         unsigned short          __pad2;
  30         __kernel_ulong_t        __unused1;
  31         __kernel_ulong_t        __unused2;
  32 };
  33
  34 #endif /* __ASM_GENERIC_IPCBUF_H */