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 #include <asm/ipcbuf.h>
7 
8 /*
9  * generic msqid64_ds structure.
10  *
11  * Note extra padding because this structure is passed back and forth
12  * between kernel and user space.
13  *
14  * msqid64_ds was originally meant to be architecture specific, but
15  * everyone just ended up making identical copies without specific
16  * optimizations, so we may just as well all use the same one.
17  *
18  * 64 bit architectures use a 64-bit long time field here, while
19  * 32 bit architectures have a pair of unsigned long values.
20  * On big-endian systems, the lower half is in the wrong place.
21  *
22  * Pad space is left for:
23  * - 2 miscellaneous 32-bit values
24  */
25 
26 struct msqid64_ds {
27 	struct ipc64_perm msg_perm;
28 #if __BITS_PER_LONG == 64
29 	long		 msg_stime;	/* last msgsnd time */
30 	long		 msg_rtime;	/* last msgrcv time */
31 	long		 msg_ctime;	/* last change time */
32 #else
33 	unsigned long	msg_stime;	/* last msgsnd time */
34 	unsigned long	msg_stime_high;
35 	unsigned long	msg_rtime;	/* last msgrcv time */
36 	unsigned long	msg_rtime_high;
37 	unsigned long	msg_ctime;	/* last change time */
38 	unsigned long	msg_ctime_high;
39 #endif
40 	unsigned long	msg_cbytes;	/* current number of bytes on queue */
41 	unsigned long	msg_qnum;	/* number of messages in queue */
42 	unsigned long	 msg_qbytes;	/* max number of bytes on queue */
43 	__kernel_pid_t msg_lspid;	/* pid of last msgsnd */
44 	__kernel_pid_t msg_lrpid;	/* last receive pid */
45 	unsigned long	 __unused4;
46 	unsigned long	 __unused5;
47 };
48 
49 #endif /* __ASM_GENERIC_MSGBUF_H */
50