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 */ 15 struct 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 */ 35 struct msgbuf { 36 long mtype; /* type of message */ 37 char mtext[1]; /* message text */ 38 }; 39 40 /* buffer for msgctl calls IPC_INFO, MSG_INFO */ 41 struct 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 66 asmlinkage long sys_msgget (key_t key, int msgflg); 67 asmlinkage long sys_msgsnd (int msqid, struct msgbuf *msgp, size_t msgsz, int msgflg); 68 asmlinkage long sys_msgrcv (int msqid, struct msgbuf *msgp, size_t msgsz, long msgtyp, int msgflg); 69 asmlinkage long sys_msgctl (int msqid, int cmd, struct msqid_ds *buf); 70 71 #endif /* __KERNEL__ */ 72 73 #endif /* _LINUX_MSG_H */ 74