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 */ 16 struct 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 */ 36 struct msgbuf { 37 long mtype; /* type of message */ 38 char mtext[1]; /* message text */ 39 }; 40 41 /* buffer for msgctl calls IPC_INFO, MSG_INFO */ 42 struct 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 */ 68 struct 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 */ 78 struct msg_queue { 79 struct kern_ipc_perm q_perm; 80 int q_id; 81 time_t q_stime; /* last msgsnd time */ 82 time_t q_rtime; /* last msgrcv time */ 83 time_t q_ctime; /* last change time */ 84 unsigned long q_cbytes; /* current number of bytes on queue */ 85 unsigned long q_qnum; /* number of messages in queue */ 86 unsigned long q_qbytes; /* max number of bytes on queue */ 87 pid_t q_lspid; /* pid of last msgsnd */ 88 pid_t q_lrpid; /* last receive pid */ 89 90 struct list_head q_messages; 91 struct list_head q_receivers; 92 struct list_head q_senders; 93 }; 94 95 #endif /* __KERNEL__ */ 96 97 #endif /* _LINUX_MSG_H */ 98