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01: #ifndef _LINUX_MSG_H
02: #define _LINUX_MSG_H
03: 
04: #include <linux/ipc.h>
05: 
06: /* ipcs ctl commands */
07: #define MSG_STAT 11
08: #define MSG_INFO 12
09: 
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: /*
53:  * Scaling factor to compute msgmni:
54:  * the memory dedicated to msg queues (msgmni * msgmnb) should occupy
55:  * at most 1/MSG_MEM_SCALE of the lowmem (see the formula in ipc/msg.c):
56:  * up to 8MB       : msgmni = 16 (MSGMNI)
57:  * 4 GB            : msgmni = 8K
58:  * more than 16 GB : msgmni = 32K (IPCMNI)
59:  */
60: #define MSG_MEM_SCALE 32
61: 
62: #define MSGMNI    16   /* <= IPCMNI */     /* max # of msg queue identifiers */
63: #define MSGMAX  8192   /* <= INT_MAX */   /* max size of message (bytes) */
64: #define MSGMNB 16384   /* <= INT_MAX */   /* default max size of a message queue */
65: 
66: /* unused */
67: #define MSGPOOL (MSGMNI * MSGMNB / 1024) /* size in kbytes of message pool */
68: #define MSGTQL  MSGMNB            /* number of system message headers */
69: #define MSGMAP  MSGMNB            /* number of entries in message map */
70: #define MSGSSZ  16                /* message segment size */
71: #define __MSGSEG ((MSGPOOL * 1024) / MSGSSZ) /* max no. of segments */
72: #define MSGSEG (__MSGSEG <= 0xffff ? __MSGSEG : 0xffff)
73: 
74: 
75: #endif /* _LINUX_MSG_H */
76: 

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