6 /* ipcs ctl commands */
11 #define MSG_NOERROR 010000 /* no error if message is too big */
12 #define MSG_EXCEPT 020000 /* recv any msg except of specified type.*/
14 /* Obsolete, used only for backwards compatibility and libc5 compiles */
16 struct ipc_perm msg_perm;
17 struct msg *msg_first; /* first message on queue,unused */
18 struct msg *msg_last; /* last message in queue,unused */
19 __kernel_time_t msg_stime; /* last msgsnd time */
20 __kernel_time_t msg_rtime; /* last msgrcv time */
21 __kernel_time_t msg_ctime; /* last change time */
22 unsigned long msg_lcbytes; /* Reuse junk fields for 32 bit */
23 unsigned long msg_lqbytes; /* ditto */
24 unsigned short msg_cbytes; /* current number of bytes on queue */
25 unsigned short msg_qnum; /* number of messages in queue */
26 unsigned short msg_qbytes; /* max number of bytes on queue */
27 __kernel_ipc_pid_t msg_lspid; /* pid of last msgsnd */
28 __kernel_ipc_pid_t msg_lrpid; /* last receive pid */
31 /* Include the definition of msqid64_ds */
32 #include <asm/msgbuf.h>
34 /* message buffer for msgsnd and msgrcv calls */
36 long mtype; /* type of message */
37 char mtext[1]; /* message text */
40 /* buffer for msgctl calls IPC_INFO, MSG_INFO */
49 unsigned short msgseg;
52 #define MSGMNI 16 /* <= IPCMNI */ /* max # of msg queue identifiers */
53 #define MSGMAX 8192 /* <= INT_MAX */ /* max size of message (bytes) */
54 #define MSGMNB 16384 /* <= INT_MAX */ /* default max size of a message queue */
57 #define MSGPOOL (MSGMNI*MSGMNB/1024) /* size in kilobytes of message pool */
58 #define MSGTQL MSGMNB /* number of system message headers */
59 #define MSGMAP MSGMNB /* number of entries in message map */
60 #define MSGSSZ 16 /* message segment size */
61 #define __MSGSEG ((MSGPOOL*1024)/ MSGSSZ) /* max no. of segments */
62 #define MSGSEG (__MSGSEG <= 0xffff ? __MSGSEG : 0xffff)
65 #include <linux/list.h>
67 /* one msg_msg structure for each message */
69 struct list_head m_list;
71 int m_ts; /* message text size */
72 struct msg_msgseg* next;
74 /* the actual message follows immediately */
77 /* one msq_queue structure for each present queue on the system */
79 struct kern_ipc_perm q_perm;
81 time_t q_stime; /* last msgsnd time */
82 time_t q_rtime; /* last msgrcv time */
83 time_t q_ctime; /* last change time */
84 unsigned long q_cbytes; /* current number of bytes on queue */
85 unsigned long q_qnum; /* number of messages in queue */
86 unsigned long q_qbytes; /* max number of bytes on queue */
87 pid_t q_lspid; /* pid of last msgsnd */
88 pid_t q_lrpid; /* last receive pid */
90 struct list_head q_messages;
91 struct list_head q_receivers;
92 struct list_head q_senders;
95 /* Helper routines for sys_msgsnd and sys_msgrcv */
96 extern long do_msgsnd(int msqid, long mtype, void __user *mtext,
97 size_t msgsz, int msgflg);
98 extern long do_msgrcv(int msqid, long *pmtype, void __user *mtext,
99 size_t msgsz, long msgtyp, int msgflg);
101 #endif /* __KERNEL__ */
103 #endif /* _LINUX_MSG_H */