i386/linux-2.3.21/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 struct msqid_ds {
  15         struct ipc_perm msg_perm;
  16         struct msg *msg_first;          /* first message on queue,unused  */
  17         struct msg *msg_last;           /* last message in queue,unused */
  18         __kernel_time_t msg_stime;      /* last msgsnd time */
  19         __kernel_time_t msg_rtime;      /* last msgrcv time */
  20         __kernel_time_t msg_ctime;      /* last change time */
  21         unsigned long  msg_lcbytes;     /* Reuse junk fields for 32 bit */
  22         unsigned long  msg_lqbytes;     /* ditto */
  23         unsigned short msg_cbytes;      /* current number of bytes on queue */
  24         unsigned short msg_qnum;        /* number of messages in queue */
  25         unsigned short msg_qbytes;      /* max number of bytes on queue */
  26         __kernel_ipc_pid_t msg_lspid;   /* pid of last msgsnd */
  27         __kernel_ipc_pid_t msg_lrpid;   /* last receive pid */
  28 };
  29
  30 /* message buffer for msgsnd and msgrcv calls */
  31 struct msgbuf {
  32         long mtype;         /* type of message */
  33         char mtext[1];      /* message text */
  34 };
  35
  36 /* buffer for msgctl calls IPC_INFO, MSG_INFO */
  37 struct msginfo {
  38         int msgpool;
  39         int msgmap;
  40         int msgmax;
  41         int msgmnb;
  42         int msgmni;
  43         int msgssz;
  44         int msgtql;
  45         unsigned short  msgseg;
  46 };
  47
  48 #define MSGMNI   128   /* <= 32768 */     /* max # of msg queue identifiers */
  49 #define MSGMAX  4056   /* <= 4056 (?)*/   /* max size of message (bytes) */
  50 #define MSGMNB 16384   /* <= MAX_INT */   /* default max size of a message queue */
  51
  52 /* unused */
  53 #define MSGPOOL (MSGMNI*MSGMNB/1024)  /* size in kilobytes of message pool */
  54 #define MSGTQL  MSGMNB            /* number of system message headers */
  55 #define MSGMAP  MSGMNB            /* number of entries in message map */
  56 #define MSGSSZ  16                /* message segment size */
  57 #define __MSGSEG ((MSGPOOL*1024)/ MSGSSZ) /* max no. of segments */
  58 #define MSGSEG (__MSGSEG <= 0xffff ? __MSGSEG : 0xffff)
  59
  60 #ifdef __KERNEL__
  61
  62 asmlinkage long sys_msgget (key_t key, int msgflg);
  63 asmlinkage long sys_msgsnd (int msqid, struct msgbuf *msgp, size_t msgsz, int msgflg);
  64 asmlinkage long sys_msgrcv (int msqid, struct msgbuf *msgp, size_t msgsz, long msgtyp, int msgflg);
  65 asmlinkage long sys_msgctl (int msqid, int cmd, struct msqid_ds *buf);
  66
  67 #endif /* __KERNEL__ */
  68
  69 #endif /* _LINUX_MSG_H */