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jcastillo |
#ifndef _LINUX_MSG_H
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#define _LINUX_MSG_H
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#include <linux/ipc.h>
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/* msgrcv options */
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#define MSG_NOERROR 010000 /* no error if message is too big */
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#define MSG_EXCEPT 020000 /* recv any msg except of specified type.*/
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/* one msqid structure for each queue on the system */
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struct msqid_ds {
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struct ipc_perm msg_perm;
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struct msg *msg_first; /* first message on queue */
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struct msg *msg_last; /* last message in queue */
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time_t msg_stime; /* last msgsnd time */
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time_t msg_rtime; /* last msgrcv time */
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time_t msg_ctime; /* last change time */
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struct wait_queue *wwait;
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struct wait_queue *rwait;
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ushort msg_cbytes; /* current number of bytes on queue */
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ushort msg_qnum; /* number of messages in queue */
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ushort msg_qbytes; /* max number of bytes on queue */
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ushort msg_lspid; /* pid of last msgsnd */
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ushort msg_lrpid; /* last receive pid */
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};
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/* message buffer for msgsnd and msgrcv calls */
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struct msgbuf {
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long mtype; /* type of message */
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char mtext[1]; /* message text */
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};
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/* buffer for msgctl calls IPC_INFO, MSG_INFO */
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struct msginfo {
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int msgpool;
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int msgmap;
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int msgmax;
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int msgmnb;
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int msgmni;
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int msgssz;
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int msgtql;
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ushort msgseg;
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};
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#define MSGMNI 128 /* <= 1K */ /* max # of msg queue identifiers */
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#define MSGMAX 4056 /* <= 4056 */ /* max size of message (bytes) */
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#define MSGMNB 16384 /* ? */ /* default max size of a message queue */
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/* unused */
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#define MSGPOOL (MSGMNI*MSGMNB/1024) /* size in kilobytes of message pool */
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#define MSGTQL MSGMNB /* number of system message headers */
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#define MSGMAP MSGMNB /* number of entries in message map */
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#define MSGSSZ 16 /* message segment size */
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#define __MSGSEG ((MSGPOOL*1024)/ MSGSSZ) /* max no. of segments */
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#define MSGSEG (__MSGSEG <= 0xffff ? __MSGSEG : 0xffff)
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#ifdef __KERNEL__
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/* one msg structure for each message */
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struct msg {
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struct msg *msg_next; /* next message on queue */
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long msg_type;
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char *msg_spot; /* message text address */
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time_t msg_stime; /* msgsnd time */
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short msg_ts; /* message text size */
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};
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/* ipcs ctl commands */
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#define MSG_STAT 11
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#define MSG_INFO 12
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asmlinkage int sys_msgget (key_t key, int msgflg);
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asmlinkage int sys_msgsnd (int msqid, struct msgbuf *msgp, size_t msgsz, int msgflg);
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asmlinkage int sys_msgrcv (int msqid, struct msgbuf *msgp, size_t msgsz, long msgtyp,
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int msgflg);
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asmlinkage int sys_msgctl (int msqid, int cmd, struct msqid_ds *buf);
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#endif /* __KERNEL__ */
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#endif /* _LINUX_MSG_H */
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