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1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */2#ifndef __ASM_GENERIC_SHMBUF_H3#define __ASM_GENERIC_SHMBUF_H4 5#include <asm/bitsperlong.h>6#include <asm/ipcbuf.h>7#include <asm/posix_types.h>8 9/*10 * The shmid64_ds structure for x86 architecture.11 * Note extra padding because this structure is passed back and forth12 * between kernel and user space.13 *14 * shmid64_ds was originally meant to be architecture specific, but15 * everyone just ended up making identical copies without specific16 * optimizations, so we may just as well all use the same one.17 *18 * 64 bit architectures use a 64-bit long time field here, while19 * 32 bit architectures have a pair of unsigned long values.20 * On big-endian systems, the lower half is in the wrong place.21 *22 *23 * Pad space is left for:24 * - 2 miscellaneous 32-bit values25 */26 27struct shmid64_ds {28 struct ipc64_perm shm_perm; /* operation perms */29 __kernel_size_t shm_segsz; /* size of segment (bytes) */30#if __BITS_PER_LONG == 6431 long shm_atime; /* last attach time */32 long shm_dtime; /* last detach time */33 long shm_ctime; /* last change time */34#else35 unsigned long shm_atime; /* last attach time */36 unsigned long shm_atime_high;37 unsigned long shm_dtime; /* last detach time */38 unsigned long shm_dtime_high;39 unsigned long shm_ctime; /* last change time */40 unsigned long shm_ctime_high;41#endif42 __kernel_pid_t shm_cpid; /* pid of creator */43 __kernel_pid_t shm_lpid; /* pid of last operator */44 unsigned long shm_nattch; /* no. of current attaches */45 unsigned long __unused4;46 unsigned long __unused5;47};48 49struct shminfo64 {50 unsigned long shmmax;51 unsigned long shmmin;52 unsigned long shmmni;53 unsigned long shmseg;54 unsigned long shmall;55 unsigned long __unused1;56 unsigned long __unused2;57 unsigned long __unused3;58 unsigned long __unused4;59};60 61#endif /* __ASM_GENERIC_SHMBUF_H */62