linux/include/asm-generic/ipcbuf.h
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   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
  19struct 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        unsigned long           __unused1;
  31        unsigned long           __unused2;
  32};
  33
  34#endif /* __ASM_GENERIC_IPCBUF_H */
  35
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