1. 根目录:
2. arch
3. xtensa
4. include
5. uapi
6. asm
7. shmbuf.h

/*
 * include/asm-xtensa/shmbuf.h
 *
 * The shmid64_ds structure for Xtensa architecture.
 * Note extra padding because this structure is passed back and forth
 * between kernel and user space.
 *
 * Pad space is left for:
 * - 64-bit time_t to solve y2038 problem
 * - 2 miscellaneous 32-bit values
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2001 - 2005 Tensilica Inc.
 */

#ifndef _XTENSA_SHMBUF_H
#define _XTENSA_SHMBUF_H

#if defined (__XTENSA_EL__)
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 */
	unsigned long		__unused1;
	__kernel_time_t		shm_dtime;	/* last detach time */
	unsigned long		__unused2;
	__kernel_time_t		shm_ctime;	/* last change time */
	unsigned long		__unused3;
	__kernel_pid_t		shm_cpid;	/* pid of creator */
	__kernel_pid_t		shm_lpid;	/* pid of last operator */
	unsigned long		shm_nattch;	/* no. of current attaches */
	unsigned long		__unused4;
	unsigned long		__unused5;
};
#elif defined (__XTENSA_EB__)
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 */
	unsigned long		__unused1;
	__kernel_time_t		shm_dtime;	/* last detach time */
	unsigned long		__unused2;
	__kernel_time_t		shm_ctime;	/* last change time */
	unsigned long		__unused3;
	__kernel_pid_t		shm_cpid;	/* pid of creator */
	__kernel_pid_t		shm_lpid;	/* pid of last operator */
	unsigned long		shm_nattch;	/* no. of current attaches */
	unsigned long		__unused4;
	unsigned long		__unused5;
};
#else
# error endian order not defined
#endif


struct shminfo64 {
	unsigned long	shmmax;
	unsigned long	shmmin;
	unsigned long	shmmni;
	unsigned long	shmseg;
	unsigned long	shmall;
	unsigned long	__unused1;
	unsigned long	__unused2;
	unsigned long	__unused3;
	unsigned long	__unused4;
};

#endif	/* _XTENSA_SHMBUF_H */