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