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<HTML>
<HEAD>
<!-- $Id: Tags.html,v 1.6 1999/07/30 16:22:24 coryan Exp $ -->
<TITLE>Tags used in TAO</TITLE>
</HEAD>
<BODY text = "#000000"
link="#000fff"
vlink="#ff0f0f"
bgcolor="#ffffff">
<HR><P><H3 ALIGN=CENTER>Tags used in TAO</H3></P>
<H3>Overview</H3>
<P>The <A HREF="http://www.omg.org/library/c2indx.html">CORBA</A>
specification defines several tags, a.k.a. <EM>magic numbers</EM>,
to distinguish between several otherwise opaque entities.
For example,
all profiles are transmitted as a CDR encapsulation (a sequence
of octets),
using a tag the type of the profile can be determined and the
encapsulation can be properly interpreted.
</P>
<P>To ensure that the tags uniquely indentify the entities in each
namespace the <A HREF="http://www.omg.org/">OMG</A> acts as an
<EM>allocation authority</EM>,
keeps a registry of the tags allocated so far and assigning the
new tag values on demand.
The process to request a tag is very simple,
interested readers can consult
<A HREF="http://www.omg.org/cgi-bin/doc?ptc/99-02-01">this
link</A>
for more details
</P>
<P>We have reserved several tags for TAO, this page documents
those tags and how they are used, some details are subject to
change. We recommend that interested readers check the
<A HREF="../releasenotes/index.html">release notes</A>
</P>
<H3>List of TAGS</H3>
<H4>ORB Type ID</H4>
<P><TABLE BORDER="2" CELLSPACING="2" CELLPADDING="0" >
<TR><TH>Hex Value</TH><TH>ASCII Representation</TH>
<TH>Description</TH></TR>
<TR>
<TD>0x54414f00</TD><TD>"TAO\0x00"</TD><TD>IIOP profiles
contain a component list. One of the elements of this
list (the <CODE>IOP::TAG_ORB_TYPE</CODE>) contains a
identifier for the ORB that created the profile.
</TD>
</TR>
</TABLE></P>
<H4>IOR Profile IDs</H4>
<P><TABLE BORDER="2" CELLSPACING="2" CELLPADDING="0" >
<TR><TH>Hex Value</TH><TH>ASCII Representation</TH>
<TH>Description</TH></TR>
<TR>
<TD>0x54414f00</TD><TD>"TAO\0x00"</TD><TD>A TAO local IPC (aka
Unix domain) profile.
</TD>
</TR>
</TABLE></P>
<P>The range <CODE>0x54414f01-0x54414f0f</CODE>
(<CODE>"TAO\0x01"-"TAO\0x0f"</CODE>) is reserved for future use.
Only for informational purposes we include the following list
of potential uses:
</P>
<P><TABLE>
<TR><TH>Hex Value</TH><TH>ASCII Representation</TH>
<TH>Description</TH></TR>
<TR>
<TD>0x54414f01</TD><TD>"TAO\0x01"</TD>
<TD>GIOP over ATM/AAL5</TD>
</TR>
<TR>
<TD>0x54414f02</TD><TD>"TAO\0x02"</TD>
<TD>Shared memory transport</TD>
</TR>
<TR>
<TD>0x54414f03</TD><TD>"TAO\0x03"</TD>
<TD>Message queue</TD>
</TR>
<TR>
<TD>0x54414f04</TD><TD>"TAO\0x04"</TD>
<TD>UDP</TD>
</TR>
<TR>
<TD>0x54414f05</TD><TD>"TAO\0x05"</TD>
<TD>IP multicast</TD>
</TR>
<TR>
<TD>0x54414f06</TD><TD>"TAO\0x06"</TD>
<TD>Compact PCI bus</TD>
</TR>
<TR>
<TD>0x54414f07</TD><TD>"TAO\0x07"</TD>
<TD>VME bus</TD>
</TR>
<TR>
<TD>0x54414f08</TD><TD>"TAO\0x08"</TD>
<TD>NT named pipes</TD>
</TR>
<TR>
<TD>0x54414f09</TD><TD>"TAO\0x09"</TD>
<TD>HTTP-NG</TD>
</TR>
<TR>
<TD>0x54414f0A</TD><TD>"TAO\0x0A"</TD>
<TD>Pipes (for collocated calls)</TD>
</TR>
</TABLE></P>
<H4>Service Context ID</H4>
<P>The range <CODE>0x54414f00-0x54414f0f</CODE>
(<CODE>"TAO\0x00"-"TAO\0x0f"</CODE>) is reserved for future
use.
</P>
<H4>Component IDs</H4>
<P><TABLE BORDER="2" CELLSPACING="2" CELLPADDING="0" >
<TR><TH>Hex Value</TH><TH>ASCII Representation</TH>
<TH>Description</TH></TR>
<TR>
<TD>0x54414f00</TD><TD>"TAO\0x00"</TD>
<TD>Server side priority for the endpoint in this profile.
The component is encoded a two shorts, the minimum and
maximum priorities (in that order).
The values correspond to the CORBA priorities defined in the
real-time CORBA spec.
The client will select the endpoint that matches its
priorities and policies.
</TD>
</TR>
</TABLE></P>
<P>The range <CODE>0x54414f01-0x54414f0f</CODE>
(<CODE>"TAO\0x00"-"TAO\0x0f"</CODE>) is reserved for future
use.
</P>
<H4>Vendor Minor Code ID (VMCID)</H4>
<P><TABLE BORDER="2" CELLSPACING="2" CELLPADDING="0" >
<TR><TH>Hex Value</TH><TH>ASCII Representation</TH>
<TH>Description</TH></TR>
<TR>
<TD>0x54410000</TD><TD>"TA\x00x00"</TD>
<TD>System exceptions thrown by TAO have their higher 20 bits
set to <CODE>0x54410</CODE>,
the other 12 bits are used to describe more precisely the
cause of the exception.
The lower 4 bits encode the errno that caused the exception,
the 8 intermediate bits encode the location where the
exception was raised.
</TD>
</TR>
</TABLE></P>
<P>The following list describes the current use of errno and
location encodings:</P>
<P><TABLE BORDER="2" CELLSPACING="2" CELLPADDING="0" >
<TR><TH>Errno Value</TH><TH>Description</TH></TR>
<TR>
<TD>0x00</TD><TD>The error was not caused by a failed system
call</TD>
</TR>
<TR><TD>0x01</TD><TD>ETIMEDTOUT</TD></TR>
<TR><TD>0x02</TD><TD>ENFILE</TD></TR>
<TR><TD>0x03</TD><TD>EMFILE</TD></TR>
<TR><TD>0x04</TD><TD>EPIPE</TD></TR>
<TR><TD>0x05</TD><TD>ECONNREFUSED</TD></TR>
<TR><TD>0x06</TD><TD>ENOENT</TD></TR>
<TR><TD>0x07</TD><TD>EBADF</TD></TR>
<TR><TD>0x08</TD><TD>ENOSYS</TD></TR>
<TR><TD>0x09</TD><TD>EPERM</TD></TR>
<TR><TD>0x0A</TD><TD>EAFNOSUPPORT</TD></TR>
</TABLE></P>
<P>Please consult the documentation for your OS for more details
about the errno meanings</P>
<P><TABLE BORDER="2" CELLSPACING="2" CELLPADDING="0" >
<TR><TH>Location encoding</TH><TH>Description</TH></TR>
<TR><TD>0x01</TD>
<TD>Connect failed</TD></TR>
<TR><TD>0x02</TD>
<TD>Location forward failed</TD></TR>
<TR><TD>0x03</TD>
<TD>Send request failed</TD></TR>
<TR><TD>0x04</TD>
<TD>POA in discarding state</TD></TR>
<TR><TD>0x05</TD>
<TD>POA in holding state</TD></TR>
<TR><TD>0x06</TD>
<TD>Unhandled C++ exception in server side</TD></TR>
<TR><TD>0x07</TD>
<TD>Failure while reading the reply</TD></TR>
<TR><TD>0x08</TD>
<TD>All protocols failed to parse the IOR</TD></TR>
<TR><TD>0x09</TD>
<TD>Attempt to use null pointer</TD></TR>
<TR><TD>0x0A</TD>
<TD>Error during MProfile creation</TD></TR>
<TR><TD>0x0B</TD>
<TD>Timeout while trying to establish the connection</TD></TR>
<TR><TD>0x0C</TD>
<TD>Timeout while sending the request</TD></TR>
<TR><TD>0x0D</TD>
<TD>Timeout while waiting for the reply</TD></TR>
</TABLE></P>
<P><HR></P>
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