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 24 struct 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