The Grid Community Toolkit documentation was taken from the Globus Toolkit 6.0 documentation. As a result, there may be inaccuracies and outdated information. Please report any problems to the Grid Community Forums as GitHub issues.


Globus XIO is an extensible input/output library written in C for the Grid Community Toolkit. It provides a single API (open/close/read/write) that supports multiple wire protocols, with protocol implementations encapsulated as drivers. The XIO drivers distributed with 6.2 include TCP, UDP, file, HTTP, GSI, GSSAPI_FTP, TELNET and queuing. In addition, Globus XIO provides a driver development interface for use by protocol developers. This interface allows the developer to concentrate on writing protocol code rather than infrastructure, as XIO provides a framework for error handling, asynchronous message delivery, timeouts, etc. The XIO driver-based approach maximizes the reuse of code by supporting the notion of a driver stack. XIO drivers can be written as atomic units and stacked on top of one another. This modularization provides maximum flexibility and simplifies the design and evaluation of individual protocols.

The following guides are available for this component:

Admin Guide

For system administrators and those installing, building and deploying GCT. Contains information specific to the XIO. You should already have read the Installation Guide and Quickstart

Developer’s Guide

Reference and usage scenarios for developers.

Other information available for this component are:

Release Notes

What’s new with the 6.2 release for this component.

Public Interface Guide

Information for all public interfaces (including APIs, commands, etc). Please note this is a subset of information in the Developer’s Guide

Quality Profile

Information about test coverage reports, etc.

Migrating Guide

Information for migrating to this version if you were using a previous version of GT or GCT.