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#ifndef _SYS_MSG_H
#define _SYS_MSG_H
#include <sys/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.*/
struct msqid_ds {
struct ipc_perm msg_perm;
struct msg *msg_first; /* first message on queue,unused */
struct msg *msg_last; /* last message in queue,unused */
time_t msg_stime; /* last msgsnd time */
time_t msg_rtime; /* last msgrcv time */
time_t msg_ctime; /* last change time */
unsigned long msg_lcbytes; /* Reuse junk fields for 32 bit */
unsigned long msg_lqbytes; /* ditto */
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 */
pid_t msg_lspid; /* pid of last msgsnd */
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 16 /* <= IPCMNI */ /* max # of msg queue identifiers */
#define MSGMAX 8192 /* <= INT_MAX */ /* max size of message (bytes) */
#define MSGMNB 16384 /* <= INT_MAX */ /* default max size of a message queue */
extern int msgctl (int msqid, int cmd, struct msqid_ds *buf) __THROW;
extern int msgget (key_t key, int msgflg) __THROW;
extern int msgrcv (int msqid, void *msgp, size_t msgsz, long int msgtyp, int msgflg) __THROW;
extern int msgsnd (int msqid, const void *msgp, size_t msgsz, int msgflg) __THROW;
#endif
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