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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef __ASM_GENERIC_SHMBUF_H
#define __ASM_GENERIC_SHMBUF_H
#include <asm/bitsperlong.h>
/*
* The shmid64_ds structure for x86 architecture.
* Note extra padding because this structure is passed back and forth
* between kernel and user space.
*
* shmid64_ds was originally meant to be architecture specific, but
* everyone just ended up making identical copies without specific
* optimizations, so we may just as well all use the same one.
*
* 64 bit architectures typically define a 64 bit __kernel_time_t,
* so they do not need the first two padding words.
* On big-endian systems, the padding is in the wrong place.
*
*
* Pad space is left for:
* - 64-bit time_t to solve y2038 problem
* - 2 miscellaneous 32-bit values
*/
struct shmid64_ds {
struct ipc64_perm shm_perm; /* operation perms */
size_t shm_segsz; /* size of segment (bytes) */
__kernel_time_t shm_atime; /* last attach time */
#if __BITS_PER_LONG != 64
unsigned long __unused1;
#endif
__kernel_time_t shm_dtime; /* last detach time */
#if __BITS_PER_LONG != 64
unsigned long __unused2;
#endif
__kernel_time_t shm_ctime; /* last change time */
#if __BITS_PER_LONG != 64
unsigned long __unused3;
#endif
__kernel_pid_t shm_cpid; /* pid of creator */
__kernel_pid_t shm_lpid; /* pid of last operator */
__kernel_ulong_t shm_nattch; /* no. of current attaches */
__kernel_ulong_t __unused4;
__kernel_ulong_t __unused5;
};
struct shminfo64 {
__kernel_ulong_t shmmax;
__kernel_ulong_t shmmin;
__kernel_ulong_t shmmni;
__kernel_ulong_t shmseg;
__kernel_ulong_t shmall;
__kernel_ulong_t __unused1;
__kernel_ulong_t __unused2;
__kernel_ulong_t __unused3;
__kernel_ulong_t __unused4;
};
#endif /* __ASM_GENERIC_SHMBUF_H */
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