include/uapi/asm-generic/ipcbuf.h

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 #ifndef __ASM_GENERIC_IPCBUF_H
   3 #define __ASM_GENERIC_IPCBUF_H
   4
   5 /*
   6  * The generic ipc64_perm structure:
   7  * Note extra padding because this structure is passed back and forth
   8  * between kernel and user space.
   9  *
  10  * ipc64_perm was originally meant to be architecture specific, but
  11  * everyone just ended up making identical copies without specific
  12  * optimizations, so we may just as well all use the same one.
  13  *
  14  * Pad space is left for:
  15  * - 32-bit mode_t on architectures that only had 16 bit
  16  * - 32-bit seq
  17  * - 2 miscellaneous 32-bit values
  18  */
  19
  20 struct ipc64_perm {
  21         __kernel_key_t          key;
  22         __kernel_uid32_t        uid;
  23         __kernel_gid32_t        gid;
  24         __kernel_uid32_t        cuid;
  25         __kernel_gid32_t        cgid;
  26         __kernel_mode_t         mode;
  27                                 /* pad if mode_t is u16: */
  28         unsigned char           __pad1[4 - sizeof(__kernel_mode_t)];
  29         unsigned short          seq;
  30         unsigned short          __pad2;
  31         __kernel_ulong_t        __unused1;
  32         __kernel_ulong_t        __unused2;
  33 };
  34
  35 #endif /* __ASM_GENERIC_IPCBUF_H */