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 #include <linux/posix_types.h>
   6
   7 /*
   8  * The generic ipc64_perm structure:
   9  * Note extra padding because this structure is passed back and forth
  10  * between kernel and user space.
  11  *
  12  * ipc64_perm was originally meant to be architecture specific, but
  13  * everyone just ended up making identical copies without specific
  14  * optimizations, so we may just as well all use the same one.
  15  *
  16  * Pad space is left for:
  17  * - 32-bit mode_t on architectures that only had 16 bit
  18  * - 32-bit seq
  19  * - 2 miscellaneous 32-bit values
  20  */
  21
  22 struct ipc64_perm {
  23         __kernel_key_t          key;
  24         __kernel_uid32_t        uid;
  25         __kernel_gid32_t        gid;
  26         __kernel_uid32_t        cuid;
  27         __kernel_gid32_t        cgid;
  28         __kernel_mode_t         mode;
  29                                 /* pad if mode_t is u16: */
  30         unsigned char           __pad1[4 - sizeof(__kernel_mode_t)];
  31         unsigned short          seq;
  32         unsigned short          __pad2;
  33         __kernel_ulong_t        __unused1;
  34         __kernel_ulong_t        __unused2;
  35 };
  36
  37 #endif /* __ASM_GENERIC_IPCBUF_H */