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kernel/linux-imx6_3.14.28/include/uapi/linux/msg.h 2.59 KB
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  #ifndef _UAPI_LINUX_MSG_H
  #define _UAPI_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.*/
  #define MSG_COPY        040000  /* copy (not remove) all queue messages */
  
  /* 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 {
  	__kernel_long_t 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; 
  };
  
  /*
   * Scaling factor to compute msgmni:
   * the memory dedicated to msg queues (msgmni * msgmnb) should occupy
   * at most 1/MSG_MEM_SCALE of the lowmem (see the formula in ipc/msg.c):
   * up to 8MB       : msgmni = 16 (MSGMNI)
   * 4 GB            : msgmni = 8K
   * more than 16 GB : msgmni = 32K (IPCMNI)
   */
  #define MSG_MEM_SCALE 32
  
  #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 kbytes 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)
  
  
  #endif /* _UAPI_LINUX_MSG_H */