cpp-d1064d

[cross.git] / i686-linux-gnu-4.7 / usr / include / linux / msg.h

diff --git a/i686-linux-gnu-4.7/usr/include/linux/msg.h b/i686-linux-gnu-4.7/usr/include/linux/msg.h
new file mode 100644 (file)
index 0000000..8f1264c
--- /dev/null
+++ b/i686-linux-gnu-4.7/usr/include/linux/msg.h
@@ -0,0 +1,90 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _LINUX_MSG_H
+#define _LINUX_MSG_H
+
+#include <linux/ipc.h>
+
+/* ipcs ctl commands */
+#define MSG_STAT 11
+#define MSG_INFO 12
+#define MSG_STAT_ANY 13
+
+/* msgrcv options */
+#define MSG_NOERROR     010000  /* no error if message is too big */
+#define MSG_EXCEPT      020000  /* recv any msg except of specified type.*/
+#define MSG_COPY        040000  /* copy (not remove) all queue messages */
+
+/* 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 {
+       __kernel_long_t 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; 
+};
+
+/*
+ * MSGMNI, MSGMAX and MSGMNB are default values which can be
+ * modified by sysctl.
+ *
+ * MSGMNI is the upper limit for the number of messages queues per
+ * namespace.
+ * It has been chosen to be as large possible without facilitating
+ * scenarios where userspace causes overflows when adjusting the limits via
+ * operations of the form retrieve current limit; add X; update limit".
+ *
+ * MSGMNB is the default size of a new message queue. Non-root tasks can
+ * decrease the size with msgctl(IPC_SET), root tasks
+ * (actually: CAP_SYS_RESOURCE) can both increase and decrease the queue
+ * size. The optimal value is application dependent.
+ * 16384 is used because it was always used (since 0.99.10)
+ *
+ * MAXMAX is the maximum size of an individual message, it's a global
+ * (per-namespace) limit that applies for all message queues.
+ * It's set to 1/2 of MSGMNB, to ensure that at least two messages fit into
+ * the queue. This is also an arbitrary choice (since 2.6.0).
+ */
+
+#define MSGMNI 32000   /* <= 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 */