Root/include/asm-generic/msgbuf.h

1#ifndef __ASM_GENERIC_MSGBUF_H
2#define __ASM_GENERIC_MSGBUF_H
3
4#include <asm/bitsperlong.h>
5/*
6 * generic msqid64_ds structure.
7 *
8 * Note extra padding because this structure is passed back and forth
9 * between kernel and user space.
10 *
11 * msqid64_ds was originally meant to be architecture specific, but
12 * everyone just ended up making identical copies without specific
13 * optimizations, so we may just as well all use the same one.
14 *
15 * 64 bit architectures typically define a 64 bit __kernel_time_t,
16 * so they do not need the first three padding words.
17 * On big-endian systems, the padding is in the wrong place.
18 *
19 * Pad space is left for:
20 * - 64-bit time_t to solve y2038 problem
21 * - 2 miscellaneous 32-bit values
22 */
23
24struct msqid64_ds {
25    struct ipc64_perm msg_perm;
26    __kernel_time_t msg_stime; /* last msgsnd time */
27#if __BITS_PER_LONG != 64
28    unsigned long __unused1;
29#endif
30    __kernel_time_t msg_rtime; /* last msgrcv time */
31#if __BITS_PER_LONG != 64
32    unsigned long __unused2;
33#endif
34    __kernel_time_t msg_ctime; /* last change time */
35#if __BITS_PER_LONG != 64
36    unsigned long __unused3;
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 */
48

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