/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef __ASM_GENERIC_SHMBUF_H
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#define __ASM_GENERIC_SHMBUF_H
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#include <asm/bitsperlong.h>
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/*
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* The shmid64_ds structure for x86 architecture.
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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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* shmid64_ds 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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* 64 bit architectures use a 64-bit long time field here, while
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* 32 bit architectures have a pair of unsigned long values.
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* On big-endian systems, the lower half is in the wrong place.
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*
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*
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* Pad space is left for:
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* - 2 miscellaneous 32-bit values
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*/
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struct shmid64_ds {
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struct ipc64_perm shm_perm; /* operation perms */
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size_t shm_segsz; /* size of segment (bytes) */
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#if __BITS_PER_LONG == 64
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long shm_atime; /* last attach time */
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long shm_dtime; /* last detach time */
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long shm_ctime; /* last change time */
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#else
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unsigned long shm_atime; /* last attach time */
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unsigned long shm_atime_high;
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unsigned long shm_dtime; /* last detach time */
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unsigned long shm_dtime_high;
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unsigned long shm_ctime; /* last change time */
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unsigned long shm_ctime_high;
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#endif
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__kernel_pid_t shm_cpid; /* pid of creator */
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__kernel_pid_t shm_lpid; /* pid of last operator */
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unsigned long shm_nattch; /* no. of current attaches */
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unsigned long __unused4;
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unsigned long __unused5;
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};
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struct shminfo64 {
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unsigned long shmmax;
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unsigned long shmmin;
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unsigned long shmmni;
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unsigned long shmseg;
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unsigned long shmall;
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unsigned long __unused1;
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unsigned long __unused2;
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unsigned long __unused3;
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unsigned long __unused4;
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};
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#endif /* __ASM_GENERIC_SHMBUF_H */
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