/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef __ASM_GENERIC_SEMBUF_H
#define __ASM_GENERIC_SEMBUF_H
#include <asm /bitsperlong.h>
#include <asm /ipcbuf.h>
/*
* The semid64_ds structure for most architectures ( though it came from x86_32
* originally ) . Note extra padding because this structure is passed back and
* forth between kernel and user space .
*
* semid64_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 use a 64 - bit long time field here , while
* 32 bit architectures have a pair of unsigned long values .
*
* On big - endian systems , the padding is in the wrong place for
* historic reasons , so user space has to reconstruct a time_t
* value using
*
* user_semid_ds . sem_otime = kernel_semid64_ds . sem_otime +
* ( ( long long ) kernel_semid64_ds . sem_otime_high < < 32 )
*
* Pad space is left for 2 miscellaneous 32 - bit values
*/
struct semid64_ds {
struct ipc64_perm sem_perm; /* permissions .. see ipc.h */
#if __BITS_PER_LONG == 64
long sem_otime; /* last semop time */
long sem_ctime; /* last change time */
#else
unsigned long sem_otime; /* last semop time */
unsigned long sem_otime_high;
unsigned long sem_ctime; /* last change time */
unsigned long sem_ctime_high;
#endif
unsigned long sem_nsems; /* no. of semaphores in array */
unsigned long __unused3;
unsigned long __unused4;
};
#endif /* __ASM_GENERIC_SEMBUF_H */
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