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Linux/include/uapi/asm-generic/ipcbuf.h

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  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 */
 36 

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