1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 #ifndef __ASM_GENERIC_MSGBUF_H
3 #define __ASM_GENERIC_MSGBUF_H
4
5 #include <asm/bitsperlong.h>
6 /*
7 * generic msqid64_ds structure.
8 *
9 * Note extra padding because this structure is passed back and forth
10 * between kernel and user space.
11 *
12 * msqid64_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 three padding words.
18 * On big-endian systems, the padding is in the wrong place.
19 *
20 * Pad space is left for:
21 * - 2 miscellaneous 32-bit values
22 */
23
24 struct msqid64_ds {
25 struct ipc64_perm msg_perm;
26 #if __BITS_PER_LONG == 64
27 __kernel_time_t msg_stime; /* last msgsnd time */
28 __kernel_time_t msg_rtime; /* last msgrcv time */
29 __kernel_time_t msg_ctime; /* last change time */
30 #else
31 unsigned long msg_stime; /* last msgsnd time */
32 unsigned long msg_stime_high;
33 unsigned long msg_rtime; /* last msgrcv time */
34 unsigned long msg_rtime_high;
35 unsigned long msg_ctime; /* last change time */
36 unsigned long msg_ctime_high;
37 #endif
38 unsigned long msg_cbytes; /* current number of bytes on queue */
39 unsigned long msg_qnum; /* number of messages in queue */
40 unsigned long msg_qbytes; /* max number of bytes on queue */
41 __kernel_pid_t msg_lspid; /* pid of last msgsnd */
42 __kernel_pid_t msg_lrpid; /* last receive pid */
43 unsigned long __unused4;
44 unsigned long __unused5;
45 };
46
47 #endif /* __ASM_GENERIC_MSGBUF_H */