1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
 2#ifndef __ASM_GENERIC_SHMBUF_H
 3#define __ASM_GENERIC_SHMBUF_H
 4
 5#include <asm/bitsperlong.h>
 6
 7/*
 8 * The shmid64_ds structure for x86 architecture.
 9 * Note extra padding because this structure is passed back and forth
10 * between kernel and user space.
11 *
12 * shmid64_ds was originally meant to be architecture specific, but
13 * everyone just ended up making identical copies without specific
14 * optimizations, so we may just as well all use the same one.
15 *
16 * 64 bit architectures typically define a 64 bit __kernel_time_t,
17 * so they do not need the first two padding words.
18 * On big-endian systems, the padding is in the wrong place.
19 *
20 *
21 * Pad space is left for:
22 * - 2 miscellaneous 32-bit values
23 */
24
25struct shmid64_ds {
26	struct ipc64_perm	shm_perm;	/* operation perms */
27	size_t			shm_segsz;	/* size of segment (bytes) */
28#if __BITS_PER_LONG == 64
29	__kernel_time_t		shm_atime;	/* last attach time */
30	__kernel_time_t		shm_dtime;	/* last detach time */
31	__kernel_time_t		shm_ctime;	/* last change time */
32#else
33	unsigned long		shm_atime;	/* last attach time */
34	unsigned long		shm_atime_high;
35	unsigned long		shm_dtime;	/* last detach time */
36	unsigned long		shm_dtime_high;
37	unsigned long		shm_ctime;	/* last change time */
38	unsigned long		shm_ctime_high;
39#endif
40	__kernel_pid_t		shm_cpid;	/* pid of creator */
41	__kernel_pid_t		shm_lpid;	/* pid of last operator */
42	unsigned long		shm_nattch;	/* no. of current attaches */
43	unsigned long		__unused4;
44	unsigned long		__unused5;
45};
46
47struct shminfo64 {
48	unsigned long		shmmax;
49	unsigned long		shmmin;
50	unsigned long		shmmni;
51	unsigned long		shmseg;
52	unsigned long		shmall;
53	unsigned long		__unused1;
54	unsigned long		__unused2;
55	unsigned long		__unused3;
56	unsigned long		__unused4;
57};
58
59#endif /* __ASM_GENERIC_SHMBUF_H */

 1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
 2#ifndef __ASM_GENERIC_SHMBUF_H
 3#define __ASM_GENERIC_SHMBUF_H
 4
 5#include <asm/bitsperlong.h>
 6
 7/*
 8 * The shmid64_ds structure for x86 architecture.
 9 * Note extra padding because this structure is passed back and forth
10 * between kernel and user space.
11 *
12 * shmid64_ds was originally meant to be architecture specific, but
13 * everyone just ended up making identical copies without specific
14 * optimizations, so we may just as well all use the same one.
15 *
16 * 64 bit architectures use a 64-bit long time field here, while
17 * 32 bit architectures have a pair of unsigned long values.
18 * On big-endian systems, the lower half is in the wrong place.
19 *
20 *
21 * Pad space is left for:
22 * - 2 miscellaneous 32-bit values
23 */
24
25struct shmid64_ds {
26	struct ipc64_perm	shm_perm;	/* operation perms */
27	size_t			shm_segsz;	/* size of segment (bytes) */
28#if __BITS_PER_LONG == 64
29	long			shm_atime;	/* last attach time */
30	long			shm_dtime;	/* last detach time */
31	long			shm_ctime;	/* last change time */
32#else
33	unsigned long		shm_atime;	/* last attach time */
34	unsigned long		shm_atime_high;
35	unsigned long		shm_dtime;	/* last detach time */
36	unsigned long		shm_dtime_high;
37	unsigned long		shm_ctime;	/* last change time */
38	unsigned long		shm_ctime_high;
39#endif
40	__kernel_pid_t		shm_cpid;	/* pid of creator */
41	__kernel_pid_t		shm_lpid;	/* pid of last operator */
42	unsigned long		shm_nattch;	/* no. of current attaches */
43	unsigned long		__unused4;
44	unsigned long		__unused5;
45};
46
47struct shminfo64 {
48	unsigned long		shmmax;
49	unsigned long		shmmin;
50	unsigned long		shmmni;
51	unsigned long		shmseg;
52	unsigned long		shmall;
53	unsigned long		__unused1;
54	unsigned long		__unused2;
55	unsigned long		__unused3;
56	unsigned long		__unused4;
57};
58
59#endif /* __ASM_GENERIC_SHMBUF_H */