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 */ 48