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