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1 | #ifndef _UAPI_LINUX_MSG_H |
2 | #define _UAPI_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.*/ | |
4a674f34 | 13 | #define MSG_COPY 040000 /* copy (not remove) all queue messages */ |
607ca46e DH |
14 | |
15 | /* Obsolete, used only for backwards compatibility and libc5 compiles */ | |
16 | struct msqid_ds { | |
17 | struct ipc_perm msg_perm; | |
18 | struct msg *msg_first; /* first message on queue,unused */ | |
19 | struct msg *msg_last; /* last message in queue,unused */ | |
20 | __kernel_time_t msg_stime; /* last msgsnd time */ | |
21 | __kernel_time_t msg_rtime; /* last msgrcv time */ | |
22 | __kernel_time_t msg_ctime; /* last change time */ | |
23 | unsigned long msg_lcbytes; /* Reuse junk fields for 32 bit */ | |
24 | unsigned long msg_lqbytes; /* ditto */ | |
25 | unsigned short msg_cbytes; /* current number of bytes on queue */ | |
26 | unsigned short msg_qnum; /* number of messages in queue */ | |
27 | unsigned short msg_qbytes; /* max number of bytes on queue */ | |
28 | __kernel_ipc_pid_t msg_lspid; /* pid of last msgsnd */ | |
29 | __kernel_ipc_pid_t msg_lrpid; /* last receive pid */ | |
30 | }; | |
31 | ||
32 | /* Include the definition of msqid64_ds */ | |
33 | #include <asm/msgbuf.h> | |
34 | ||
35 | /* message buffer for msgsnd and msgrcv calls */ | |
36 | struct msgbuf { | |
443d5670 L |
37 | __kernel_long_t mtype; /* type of message */ |
38 | char mtext[1]; /* message text */ | |
607ca46e DH |
39 | }; |
40 | ||
41 | /* buffer for msgctl calls IPC_INFO, MSG_INFO */ | |
42 | struct msginfo { | |
43 | int msgpool; | |
44 | int msgmap; | |
45 | int msgmax; | |
46 | int msgmnb; | |
47 | int msgmni; | |
48 | int msgssz; | |
49 | int msgtql; | |
50 | unsigned short msgseg; | |
51 | }; | |
52 | ||
53 | /* | |
54 | * Scaling factor to compute msgmni: | |
55 | * the memory dedicated to msg queues (msgmni * msgmnb) should occupy | |
56 | * at most 1/MSG_MEM_SCALE of the lowmem (see the formula in ipc/msg.c): | |
57 | * up to 8MB : msgmni = 16 (MSGMNI) | |
58 | * 4 GB : msgmni = 8K | |
59 | * more than 16 GB : msgmni = 32K (IPCMNI) | |
60 | */ | |
61 | #define MSG_MEM_SCALE 32 | |
62 | ||
63 | #define MSGMNI 16 /* <= IPCMNI */ /* max # of msg queue identifiers */ | |
64 | #define MSGMAX 8192 /* <= INT_MAX */ /* max size of message (bytes) */ | |
65 | #define MSGMNB 16384 /* <= INT_MAX */ /* default max size of a message queue */ | |
66 | ||
67 | /* unused */ | |
68 | #define MSGPOOL (MSGMNI * MSGMNB / 1024) /* size in kbytes of message pool */ | |
69 | #define MSGTQL MSGMNB /* number of system message headers */ | |
70 | #define MSGMAP MSGMNB /* number of entries in message map */ | |
71 | #define MSGSSZ 16 /* message segment size */ | |
72 | #define __MSGSEG ((MSGPOOL * 1024) / MSGSSZ) /* max no. of segments */ | |
73 | #define MSGSEG (__MSGSEG <= 0xffff ? __MSGSEG : 0xffff) | |
74 | ||
75 | ||
76 | #endif /* _UAPI_LINUX_MSG_H */ |