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90 lines
3.3 KiB
90 lines
3.3 KiB
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
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#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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#define MSG_STAT_ANY 13 |
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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_old_time_t msg_stime; /* last msgsnd time */ |
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__kernel_old_time_t msg_rtime; /* last msgrcv time */ |
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__kernel_old_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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* MSGMNI, MSGMAX and MSGMNB are default values which can be |
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* modified by sysctl. |
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* |
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* MSGMNI is the upper limit for the number of messages queues per |
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* namespace. |
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* It has been chosen to be as large possible without facilitating |
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* scenarios where userspace causes overflows when adjusting the limits via |
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* operations of the form retrieve current limit; add X; update limit". |
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* |
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* MSGMNB is the default size of a new message queue. Non-root tasks can |
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* decrease the size with msgctl(IPC_SET), root tasks |
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* (actually: CAP_SYS_RESOURCE) can both increase and decrease the queue |
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* size. The optimal value is application dependent. |
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* 16384 is used because it was always used (since 0.99.10) |
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* |
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* MAXMAX is the maximum size of an individual message, it's a global |
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* (per-namespace) limit that applies for all message queues. |
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* It's set to 1/2 of MSGMNB, to ensure that at least two messages fit into |
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* the queue. This is also an arbitrary choice (since 2.6.0). |
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*/ |
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#define MSGMNI 32000 /* <= 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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