1 #ifndef _LINUX_MSG_H
2 #define _LINUX_MSG_H
3
4 #include <linux/ipc.h>
5
6 /* ipcs ctl commands */
7 #define MSG_STAT 11
8 #define MSG_INFO 12
9
10 /* msgrcv options */
11 #define MSG_NOERROR 010000 /* no error if message is too big */
12 #define MSG_EXCEPT 020000 /* recv any msg except of specified type.*/
13
14 /* Obsolete, used only for backwards compatibility and libc5 compiles */
15 struct msqid_ds {
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 */
29 };
30
31 /* Include the definition of msqid64_ds */
32 #include <asm/msgbuf.h>
33
34 /* message buffer for msgsnd and msgrcv calls */
35 struct msgbuf {
36 long mtype; /* type of message */
37 char mtext[1]; /* message text */
38 };
39
40 /* buffer for msgctl calls IPC_INFO, MSG_INFO */
41 struct msginfo {
42 int msgpool;
43 int msgmap;
44 int msgmax;
45 int msgmnb;
46 int msgmni;
47 int msgssz;
48 int msgtql;
49 unsigned short msgseg;
50 };
51
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 */
55
56 /* unused */
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)
63
64 #ifdef __KERNEL__
65
66 asmlinkage long sys_msgget (key_t key, int msgflg);
67 asmlinkage long sys_msgsnd (int msqid, struct msgbuf *msgp, size_t msgsz, int msgflg);
68 asmlinkage long sys_msgrcv (int msqid, struct msgbuf *msgp, size_t msgsz, long msgtyp, int msgflg);
69 asmlinkage long sys_msgctl (int msqid, int cmd, struct msqid_ds *buf);
70
71 #endif /* __KERNEL__ */
72
73 #endif /* _LINUX_MSG_H */
74
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