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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | #ifndef _LINUX_MSG_H |
| 2 | #define _LINUX_MSG_H |
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| 3 | |||
| 4 | #include <linux/ipc.h> |
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| 5 | |||
| 6 | /* ipcs ctl commands */ |
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| 7 | #define MSG_STAT 11 |
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| 8 | #define MSG_INFO 12 |
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| 9 | |||
| 10 | /* msgrcv options */ |
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| 11 | #define MSG_NOERROR 010000 /* no error if message is too big */ |
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| 12 | #define MSG_EXCEPT 020000 /* recv any msg except of specified type.*/ |
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| 13 | |||
| 14 | /* Obsolete, used only for backwards compatibility and libc5 compiles */ |
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| 15 | struct msqid_ds { |
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| 16 | struct ipc_perm msg_perm; |
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| 17 | struct msg *msg_first; /* first message on queue,unused */ |
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| 18 | struct msg *msg_last; /* last message in queue,unused */ |
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| 19 | __kernel_time_t msg_stime; /* last msgsnd time */ |
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| 20 | __kernel_time_t msg_rtime; /* last msgrcv time */ |
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| 21 | __kernel_time_t msg_ctime; /* last change time */ |
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| 22 | unsigned long msg_lcbytes; /* Reuse junk fields for 32 bit */ |
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| 23 | unsigned long msg_lqbytes; /* ditto */ |
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| 24 | unsigned short msg_cbytes; /* current number of bytes on queue */ |
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| 25 | unsigned short msg_qnum; /* number of messages in queue */ |
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| 26 | unsigned short msg_qbytes; /* max number of bytes on queue */ |
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| 27 | __kernel_ipc_pid_t msg_lspid; /* pid of last msgsnd */ |
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| 28 | __kernel_ipc_pid_t msg_lrpid; /* last receive pid */ |
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| 29 | }; |
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| 30 | |||
| 31 | /* Include the definition of msqid64_ds */ |
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| 32 | #include <asm/msgbuf.h> |
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| 33 | |||
| 34 | /* message buffer for msgsnd and msgrcv calls */ |
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| 35 | struct msgbuf { |
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| 36 | long mtype; /* type of message */ |
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| 37 | char mtext[1]; /* message text */ |
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| 38 | }; |
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| 39 | |||
| 40 | /* buffer for msgctl calls IPC_INFO, MSG_INFO */ |
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| 41 | struct msginfo { |
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| 42 | int msgpool; |
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| 43 | int msgmap; |
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| 44 | int msgmax; |
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| 45 | int msgmnb; |
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| 46 | int msgmni; |
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| 47 | int msgssz; |
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| 48 | int msgtql; |
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| 49 | unsigned short msgseg; |
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| 50 | }; |
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| 51 | |||
| 52 | #define MSGMNI 16 /* <= IPCMNI */ /* max # of msg queue identifiers */ |
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| 53 | #define MSGMAX 8192 /* <= INT_MAX */ /* max size of message (bytes) */ |
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| 54 | #define MSGMNB 16384 /* <= INT_MAX */ /* default max size of a message queue */ |
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| 55 | |||
| 56 | /* unused */ |
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| 57 | #define MSGPOOL (MSGMNI*MSGMNB/1024) /* size in kilobytes of message pool */ |
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| 58 | #define MSGTQL MSGMNB /* number of system message headers */ |
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| 59 | #define MSGMAP MSGMNB /* number of entries in message map */ |
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| 60 | #define MSGSSZ 16 /* message segment size */ |
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| 61 | #define __MSGSEG ((MSGPOOL*1024)/ MSGSSZ) /* max no. of segments */ |
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| 62 | #define MSGSEG (__MSGSEG <= 0xffff ? __MSGSEG : 0xffff) |
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| 63 | |||
| 64 | #ifdef __KERNEL__ |
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| 65 | |||
| 66 | /* one msg_msg structure for each message */ |
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| 67 | struct msg_msg { |
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| 68 | struct list_head m_list; |
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| 69 | long m_type; |
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| 70 | int m_ts; /* message text size */ |
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| 71 | struct msg_msgseg* next; |
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| 72 | void *security; |
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| 73 | /* the actual message follows immediately */ |
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| 74 | }; |
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| 75 | |||
| 76 | #define DATALEN_MSG (PAGE_SIZE-sizeof(struct msg_msg)) |
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| 77 | #define DATALEN_SEG (PAGE_SIZE-sizeof(struct msg_msgseg)) |
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| 78 | |||
| 79 | /* one msq_queue structure for each present queue on the system */ |
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| 80 | struct msg_queue { |
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| 81 | struct kern_ipc_perm q_perm; |
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| 82 | time_t q_stime; /* last msgsnd time */ |
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| 83 | time_t q_rtime; /* last msgrcv time */ |
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| 84 | time_t q_ctime; /* last change time */ |
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| 85 | unsigned long q_cbytes; /* current number of bytes on queue */ |
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| 86 | unsigned long q_qnum; /* number of messages in queue */ |
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| 87 | unsigned long q_qbytes; /* max number of bytes on queue */ |
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| 88 | pid_t q_lspid; /* pid of last msgsnd */ |
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| 89 | pid_t q_lrpid; /* last receive pid */ |
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| 90 | |||
| 91 | struct list_head q_messages; |
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| 92 | struct list_head q_receivers; |
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| 93 | struct list_head q_senders; |
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| 94 | }; |
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| 95 | |||
| 96 | asmlinkage long sys_msgget (key_t key, int msgflg); |
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| 97 | asmlinkage long sys_msgsnd (int msqid, struct msgbuf __user *msgp, size_t msgsz, int msgflg); |
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| 98 | asmlinkage long sys_msgrcv (int msqid, struct msgbuf __user *msgp, size_t msgsz, long msgtyp, int msgflg); |
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| 99 | asmlinkage long sys_msgctl (int msqid, int cmd, struct msqid_ds __user *buf); |
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| 100 | |||
| 101 | #endif /* __KERNEL__ */ |
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| 102 | |||
| 103 | #endif /* _LINUX_MSG_H */ |