1 files changed, 75 insertions, 0 deletions

diff --git a/include/uapi/linux/msg.h b/include/uapi/linux/msg.h
new file mode 100644
index 000000000000..78dbd2f996a3
--- /dev/null
+++ b/include/uapi/linux/msg.h
@@ -0,0 +1,75 @@
+#ifndef _UAPI_LINUX_MSG_H
+#define _UAPI_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 /* _UAPI_LINUX_MSG_H */