LXR linux-old/include/linux/msg.h

   1#ifndef _LINUX_MSG_H
   2#define _LINUX_MSG_H
   3
   4#include <linux/ipc.h>
   5
   6/* ipcs ctl commands */
   7#define MSG_STAT 11
   8#define MSG_INFO 12
   9
  10/* msgrcv options */
  11#define MSG_NOERROR     010000  /* no error if message is too big */
  12#define MSG_EXCEPT      020000  /* recv any msg except of specified type.*/
  13
  14/* Obsolete, used only for backwards compatibility and libc5 compiles */
  15struct msqid_ds {
  16        struct ipc_perm msg_perm;
  17        struct msg *msg_first;          /* first message on queue,unused  */
  18        struct msg *msg_last;           /* last message in queue,unused */
  19        __kernel_time_t msg_stime;      /* last msgsnd time */
  20        __kernel_time_t msg_rtime;      /* last msgrcv time */
  21        __kernel_time_t msg_ctime;      /* last change time */
  22        unsigned long  msg_lcbytes;     /* Reuse junk fields for 32 bit */
  23        unsigned long  msg_lqbytes;     /* ditto */
  24        unsigned short msg_cbytes;      /* current number of bytes on queue */
  25        unsigned short msg_qnum;        /* number of messages in queue */
  26        unsigned short msg_qbytes;      /* max number of bytes on queue */
  27        __kernel_ipc_pid_t msg_lspid;   /* pid of last msgsnd */
  28        __kernel_ipc_pid_t msg_lrpid;   /* last receive pid */
  29};
  30
  31/* Include the definition of msqid64_ds */
  32#include <asm/msgbuf.h>
  33
  34/* message buffer for msgsnd and msgrcv calls */
  35struct msgbuf {
  36        long mtype;         /* type of message */
  37        char mtext[1];      /* message text */
  38};
  39
  40/* buffer for msgctl calls IPC_INFO, MSG_INFO */
  41struct msginfo {
  42        int msgpool;
  43        int msgmap; 
  44        int msgmax; 
  45        int msgmnb; 
  46        int msgmni; 
  47        int msgssz; 
  48        int msgtql; 
  49        unsigned short  msgseg; 
  50};
  51
  52#define MSGMNI    16   /* <= IPCMNI */     /* max # of msg queue identifiers */
  53#define MSGMAX  8192   /* <= INT_MAX */   /* max size of message (bytes) */
  54#define MSGMNB 16384   /* <= INT_MAX */   /* default max size of a message queue */
  55
  56/* unused */
  57#define MSGPOOL (MSGMNI*MSGMNB/1024)  /* size in kilobytes of message pool */
  58#define MSGTQL  MSGMNB            /* number of system message headers */
  59#define MSGMAP  MSGMNB            /* number of entries in message map */
  60#define MSGSSZ  16                /* message segment size */
  61#define __MSGSEG ((MSGPOOL*1024)/ MSGSSZ) /* max no. of segments */
  62#define MSGSEG (__MSGSEG <= 0xffff ? __MSGSEG : 0xffff)
  63
  64#ifdef __KERNEL__
  65
  66asmlinkage long sys_msgget (key_t key, int msgflg);
  67asmlinkage long sys_msgsnd (int msqid, struct msgbuf *msgp, size_t msgsz, int msgflg);
  68asmlinkage long sys_msgrcv (int msqid, struct msgbuf *msgp, size_t msgsz, long msgtyp, int msgflg);
  69asmlinkage long sys_msgctl (int msqid, int cmd, struct msqid_ds *buf);
  70
  71#endif /* __KERNEL__ */
  72
  73#endif /* _LINUX_MSG_H */
  74