projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 607ca46e DH |
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 { | |
| 37 | long mtype; /* type of message */ | |
| 38 | char mtext[1]; /* message text */ | |
| 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 */ |