| #ifndef _LINUX_MSG_H |
| #define _LINUX_MSG_H |
| |
| #include <linux/ipc.h> |
| |
| /* ipcs ctl commands */ |
| #define MSG_STAT 11 |
| #define MSG_INFO 12 |
| |
| /* msgrcv options */ |
| #define MSG_NOERROR 010000 /* no error if message is too big */ |
| #define MSG_EXCEPT 020000 /* recv any msg except of specified type.*/ |
| |
| /* Obsolete, used only for backwards compatibility and libc5 compiles */ |
| struct msqid_ds { |
| struct ipc_perm msg_perm; |
| struct msg *msg_first; /* first message on queue,unused */ |
| struct msg *msg_last; /* last message in queue,unused */ |
| __kernel_time_t msg_stime; /* last msgsnd time */ |
| __kernel_time_t msg_rtime; /* last msgrcv time */ |
| __kernel_time_t msg_ctime; /* last change time */ |
| unsigned long msg_lcbytes; /* Reuse junk fields for 32 bit */ |
| unsigned long msg_lqbytes; /* ditto */ |
| unsigned short msg_cbytes; /* current number of bytes on queue */ |
| unsigned short msg_qnum; /* number of messages in queue */ |
| unsigned short msg_qbytes; /* max number of bytes on queue */ |
| __kernel_ipc_pid_t msg_lspid; /* pid of last msgsnd */ |
| __kernel_ipc_pid_t msg_lrpid; /* last receive pid */ |
| }; |
| |
| /* Include the definition of msqid64_ds */ |
| #include <asm/msgbuf.h> |
| |
| /* message buffer for msgsnd and msgrcv calls */ |
| struct msgbuf { |
| long mtype; /* type of message */ |
| char mtext[1]; /* message text */ |
| }; |
| |
| /* buffer for msgctl calls IPC_INFO, MSG_INFO */ |
| struct msginfo { |
| int msgpool; |
| int msgmap; |
| int msgmax; |
| int msgmnb; |
| int msgmni; |
| int msgssz; |
| int msgtql; |
| unsigned short msgseg; |
| }; |
| |
| /* |
| * Scaling factor to compute msgmni: |
| * the memory dedicated to msg queues (msgmni * msgmnb) should occupy |
| * at most 1/MSG_MEM_SCALE of the lowmem (see the formula in ipc/msg.c): |
| * up to 8MB : msgmni = 16 (MSGMNI) |
| * 4 GB : msgmni = 8K |
| * more than 16 GB : msgmni = 32K (IPCMNI) |
| */ |
| #define MSG_MEM_SCALE 32 |
| |
| #define MSGMNI 16 /* <= IPCMNI */ /* max # of msg queue identifiers */ |
| #define MSGMAX 8192 /* <= INT_MAX */ /* max size of message (bytes) */ |
| #define MSGMNB 16384 /* <= INT_MAX */ /* default max size of a message queue */ |
| |
| /* unused */ |
| #define MSGPOOL (MSGMNI * MSGMNB / 1024) /* size in kbytes of message pool */ |
| #define MSGTQL MSGMNB /* number of system message headers */ |
| #define MSGMAP MSGMNB /* number of entries in message map */ |
| #define MSGSSZ 16 /* message segment size */ |
| #define __MSGSEG ((MSGPOOL * 1024) / MSGSSZ) /* max no. of segments */ |
| #define MSGSEG (__MSGSEG <= 0xffff ? __MSGSEG : 0xffff) |
| |
| |
| #endif /* _LINUX_MSG_H */ |