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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/include/uapi/asm-generic/ipcbuf.h
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

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#ifndef __ASM_GENERIC_IPCBUF_H

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#define __ASM_GENERIC_IPCBUF_H

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#include <linux/posix_types.h>

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/*

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 * The generic ipc64_perm structure:

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 * Note extra padding because this structure is passed back and forth

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 * between kernel and user space.

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 *

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 * ipc64_perm was originally meant to be architecture specific, but

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 * everyone just ended up making identical copies without specific

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 * optimizations, so we may just as well all use the same one.

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 *

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 * Pad space is left for:

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 * - 32-bit mode_t on architectures that only had 16 bit

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 * - 32-bit seq

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 * - 2 miscellaneous 32-bit values

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 */

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struct ipc64_perm {

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	__kernel_key_t		key;

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	__kernel_uid32_t	uid;

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	__kernel_gid32_t	gid;

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	__kernel_uid32_t	cuid;

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	__kernel_gid32_t	cgid;

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	__kernel_mode_t		mode;

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				/* pad if mode_t is u16: */

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	unsigned char		__pad1[4 - sizeof(__kernel_mode_t)];

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	unsigned short		seq;

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	unsigned short		__pad2;

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	__kernel_ulong_t	__unused1;

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	__kernel_ulong_t	__unused2;

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};

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#endif /* __ASM_GENERIC_IPCBUF_H */

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