msg.h
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:2k
- #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.*/
- /* Obsolete, used only for backwards compatibility and libc5 compiles */
- 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 */
- __kernel_time_t msg_stime; /* last msgsnd time */
- __kernel_time_t msg_rtime; /* last msgrcv time */
- __kernel_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 */
- __kernel_ipc_pid_t msg_lspid; /* pid of last msgsnd */
- __kernel_ipc_pid_t msg_lrpid; /* last receive pid */
- };
- /* Include the definition of msqid64_ds */
- #include <asm/msgbuf.h>
- /* 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 */
- /* 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__
- asmlinkage long sys_msgget (key_t key, int msgflg);
- asmlinkage long sys_msgsnd (int msqid, struct msgbuf *msgp, size_t msgsz, int msgflg);
- asmlinkage long sys_msgrcv (int msqid, struct msgbuf *msgp, size_t msgsz, long msgtyp, int msgflg);
- asmlinkage long sys_msgctl (int msqid, int cmd, struct msqid_ds *buf);
- #endif /* __KERNEL__ */
- #endif /* _LINUX_MSG_H */