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76 lines
2.6 KiB
76 lines
2.6 KiB
#ifndef _UAPI_LINUX_MSG_H |
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#define _UAPI_LINUX_MSG_H |
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#include <linux/ipc.h> |
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/* ipcs ctl commands */ |
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#define MSG_STAT 11 |
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#define MSG_INFO 12 |
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/* msgrcv options */ |
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#define MSG_NOERROR 010000 /* no error if message is too big */ |
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#define MSG_EXCEPT 020000 /* recv any msg except of specified type.*/ |
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#define MSG_COPY 040000 /* copy (not remove) all queue messages */ |
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/* Obsolete, used only for backwards compatibility and libc5 compiles */ |
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struct msqid_ds { |
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struct ipc_perm msg_perm; |
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struct msg *msg_first; /* first message on queue,unused */ |
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struct msg *msg_last; /* last message in queue,unused */ |
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__kernel_time_t msg_stime; /* last msgsnd time */ |
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__kernel_time_t msg_rtime; /* last msgrcv time */ |
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__kernel_time_t msg_ctime; /* last change time */ |
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unsigned long msg_lcbytes; /* Reuse junk fields for 32 bit */ |
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unsigned long msg_lqbytes; /* ditto */ |
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unsigned short msg_cbytes; /* current number of bytes on queue */ |
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unsigned short msg_qnum; /* number of messages in queue */ |
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unsigned short msg_qbytes; /* max number of bytes on queue */ |
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__kernel_ipc_pid_t msg_lspid; /* pid of last msgsnd */ |
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__kernel_ipc_pid_t msg_lrpid; /* last receive pid */ |
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}; |
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/* Include the definition of msqid64_ds */ |
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#include <asm/msgbuf.h> |
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/* message buffer for msgsnd and msgrcv calls */ |
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struct msgbuf { |
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__kernel_long_t mtype; /* type of message */ |
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char mtext[1]; /* message text */ |
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}; |
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/* buffer for msgctl calls IPC_INFO, MSG_INFO */ |
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struct msginfo { |
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int msgpool; |
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int msgmap; |
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int msgmax; |
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int msgmnb; |
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int msgmni; |
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int msgssz; |
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int msgtql; |
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unsigned short msgseg; |
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}; |
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/* |
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* Scaling factor to compute msgmni: |
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* the memory dedicated to msg queues (msgmni * msgmnb) should occupy |
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* at most 1/MSG_MEM_SCALE of the lowmem (see the formula in ipc/msg.c): |
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* up to 8MB : msgmni = 16 (MSGMNI) |
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* 4 GB : msgmni = 8K |
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* more than 16 GB : msgmni = 32K (IPCMNI) |
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*/ |
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#define MSG_MEM_SCALE 32 |
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#define MSGMNI 16 /* <= IPCMNI */ /* max # of msg queue identifiers */ |
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#define MSGMAX 8192 /* <= INT_MAX */ /* max size of message (bytes) */ |
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#define MSGMNB 16384 /* <= INT_MAX */ /* default max size of a message queue */ |
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/* unused */ |
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#define MSGPOOL (MSGMNI * MSGMNB / 1024) /* size in kbytes of message pool */ |
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#define MSGTQL MSGMNB /* number of system message headers */ |
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#define MSGMAP MSGMNB /* number of entries in message map */ |
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#define MSGSSZ 16 /* message segment size */ |
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#define __MSGSEG ((MSGPOOL * 1024) / MSGSSZ) /* max no. of segments */ |
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#define MSGSEG (__MSGSEG <= 0xffff ? __MSGSEG : 0xffff) |
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#endif /* _UAPI_LINUX_MSG_H */
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