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-<HTML>
-<HEAD>
- <!-- $Id$ -->
- <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\0x08"</TD>
- <TD>HTTP-NG</TD>
- </TR>
- <TR>
- <TD>0x54414f0A</TD><TD>"TAO\0x08"</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>
-
- Back to the TAO <A HREF="index.html">documentation</A>.
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