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1da177e4 LT |
1 | #ifndef _LINUX_MSG_H |
2 | #define _LINUX_MSG_H | |
3 | ||
4 | #include <linux/ipc.h> | |
1da177e4 LT |
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 | ||
f7bf3df8 ND |
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 | ||
1da177e4 LT |
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 */ | |
68aa0a20 | 67 | #define MSGPOOL (MSGMNI * MSGMNB / 1024) /* size in kbytes of message pool */ |
1da177e4 LT |
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 */ | |
68aa0a20 | 71 | #define __MSGSEG ((MSGPOOL * 1024) / MSGSSZ) /* max no. of segments */ |
1da177e4 LT |
72 | #define MSGSEG (__MSGSEG <= 0xffff ? __MSGSEG : 0xffff) |
73 | ||
74 | #ifdef __KERNEL__ | |
77597ad6 | 75 | #include <linux/list.h> |
1da177e4 LT |
76 | |
77 | /* one msg_msg structure for each message */ | |
78 | struct msg_msg { | |
79 | struct list_head m_list; | |
80 | long m_type; | |
81 | int m_ts; /* message text size */ | |
82 | struct msg_msgseg* next; | |
83 | void *security; | |
84 | /* the actual message follows immediately */ | |
85 | }; | |
86 | ||
87 | /* one msq_queue structure for each present queue on the system */ | |
88 | struct msg_queue { | |
89 | struct kern_ipc_perm q_perm; | |
90 | time_t q_stime; /* last msgsnd time */ | |
91 | time_t q_rtime; /* last msgrcv time */ | |
92 | time_t q_ctime; /* last change time */ | |
93 | unsigned long q_cbytes; /* current number of bytes on queue */ | |
94 | unsigned long q_qnum; /* number of messages in queue */ | |
95 | unsigned long q_qbytes; /* max number of bytes on queue */ | |
96 | pid_t q_lspid; /* pid of last msgsnd */ | |
97 | pid_t q_lrpid; /* last receive pid */ | |
98 | ||
99 | struct list_head q_messages; | |
100 | struct list_head q_receivers; | |
101 | struct list_head q_senders; | |
102 | }; | |
103 | ||
651971cb | 104 | /* Helper routines for sys_msgsnd and sys_msgrcv */ |
105 | extern long do_msgsnd(int msqid, long mtype, void __user *mtext, | |
106 | size_t msgsz, int msgflg); | |
107 | extern long do_msgrcv(int msqid, long *pmtype, void __user *mtext, | |
108 | size_t msgsz, long msgtyp, int msgflg); | |
109 | ||
1da177e4 LT |
110 | #endif /* __KERNEL__ */ |
111 | ||
112 | #endif /* _LINUX_MSG_H */ |