msgbuf.h (1623B) - Raw
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 */