LXR linux/include/linux/msg.h

   1#ifndef _LINUX_MSG_H
   2#define _LINUX_MSG_H
   3
   4#include <linux/ipc.h>
   5#include <linux/list.h>
   6
   7/* ipcs ctl commands */
   8#define MSG_STAT 11
   9#define MSG_INFO 12
  10
  11/* msgrcv options */
  12#define MSG_NOERROR     010000  /* no error if message is too big */
  13#define MSG_EXCEPT      020000  /* recv any msg except of specified type.*/
  14
  15/* Obsolete, used only for backwards compatibility and libc5 compiles */
  16struct msqid_ds {
  17        struct ipc_perm msg_perm;
  18        struct msg *msg_first;          /* first message on queue,unused  */
  19        struct msg *msg_last;           /* last message in queue,unused */
  20        __kernel_time_t msg_stime;      /* last msgsnd time */
  21        __kernel_time_t msg_rtime;      /* last msgrcv time */
  22        __kernel_time_t msg_ctime;      /* last change time */
  23        unsigned long  msg_lcbytes;     /* Reuse junk fields for 32 bit */
  24        unsigned long  msg_lqbytes;     /* ditto */
  25        unsigned short msg_cbytes;      /* current number of bytes on queue */
  26        unsigned short msg_qnum;        /* number of messages in queue */
  27        unsigned short msg_qbytes;      /* max number of bytes on queue */
  28        __kernel_ipc_pid_t msg_lspid;   /* pid of last msgsnd */
  29        __kernel_ipc_pid_t msg_lrpid;   /* last receive pid */
  30};
  31
  32/* Include the definition of msqid64_ds */
  33#include <asm/msgbuf.h>
  34
  35/* message buffer for msgsnd and msgrcv calls */
  36struct msgbuf {
  37        long mtype;         /* type of message */
  38        char mtext[1];      /* message text */
  39};
  40
  41/* buffer for msgctl calls IPC_INFO, MSG_INFO */
  42struct msginfo {
  43        int msgpool;
  44        int msgmap; 
  45        int msgmax; 
  46        int msgmnb; 
  47        int msgmni; 
  48        int msgssz; 
  49        int msgtql; 
  50        unsigned short  msgseg; 
  51};
  52
  53#define MSGMNI    16   /* <= IPCMNI */     /* max # of msg queue identifiers */
  54#define MSGMAX  8192   /* <= INT_MAX */   /* max size of message (bytes) */
  55#define MSGMNB 16384   /* <= INT_MAX */   /* default max size of a message queue */
  56
  57/* unused */
  58#define MSGPOOL (MSGMNI*MSGMNB/1024)  /* size in kilobytes of message pool */
  59#define MSGTQL  MSGMNB            /* number of system message headers */
  60#define MSGMAP  MSGMNB            /* number of entries in message map */
  61#define MSGSSZ  16                /* message segment size */
  62#define __MSGSEG ((MSGPOOL*1024)/ MSGSSZ) /* max no. of segments */
  63#define MSGSEG (__MSGSEG <= 0xffff ? __MSGSEG : 0xffff)
  64
  65#ifdef __KERNEL__
  66
  67/* one msg_msg structure for each message */
  68struct msg_msg {
  69        struct list_head m_list; 
  70        long  m_type;          
  71        int m_ts;           /* message text size */
  72        struct msg_msgseg* next;
  73        void *security;
  74        /* the actual message follows immediately */
  75};
  76
  77/* one msq_queue structure for each present queue on the system */
  78struct msg_queue {
  79        struct kern_ipc_perm q_perm;
  80        time_t q_stime;                 /* last msgsnd time */
  81        time_t q_rtime;                 /* last msgrcv time */
  82        time_t q_ctime;                 /* last change time */
  83        unsigned long q_cbytes;         /* current number of bytes on queue */
  84        unsigned long q_qnum;           /* number of messages in queue */
  85        unsigned long q_qbytes;         /* max number of bytes on queue */
  86        pid_t q_lspid;                  /* pid of last msgsnd */
  87        pid_t q_lrpid;                  /* last receive pid */
  88
  89        struct list_head q_messages;
  90        struct list_head q_receivers;
  91        struct list_head q_senders;
  92};
  93
  94#endif /* __KERNEL__ */
  95
  96#endif /* _LINUX_MSG_H */
  97