Follow Techotopia on Twitter

On-line Guides
All Guides
eBook Store
iOS / Android
Linux for Beginners
Office Productivity
Linux Installation
Linux Security
Linux Utilities
Linux Virtualization
Linux Kernel
System/Network Admin
Programming
Scripting Languages
Development Tools
Web Development
GUI Toolkits/Desktop
Databases
Mail Systems
openSolaris
Eclipse Documentation
Techotopia.com
Virtuatopia.com

How To Guides
Virtualization
General System Admin
Linux Security
Linux Filesystems
Web Servers
Graphics & Desktop
PC Hardware
Windows
Problem Solutions
Privacy Policy

  




 

 

Back: libltdl Loader Management
Forward: Advanced GNU Automake Usage
 
FastBack: Using GNU libltdl
Up: User Module Loaders
FastForward: Advanced GNU Automake Usage
Top: Autoconf, Automake, and Libtool
Contents: Table of Contents
Index: Index
About: About this document

18.5.3 Loader Errors

When writing the code to fill out each of the functions needed to populate the lt_user_dlloader structure, you will often need to raise an error of some sort. The set of standard errors which might be raised by the internal module loaders are available for use in your own loaders, and should be used where possible for the sake of uniformity if nothing else. On the odd occasion where that is not possible, libltdl has API calls to register and set your own error messages, so that users of your module loader will be able to call lt_dlerror and have the error message you set returned:

Function: int lt_dlseterror (int errorcode)
By calling this function with one of the error codes enumerated in the header file, `ltdl.h', lt_dlerror will return the associated diagnostic until the error code is changed again.

Function: int lt_dladderror (const char *diagnostic)
Often you will find that the existing error diagnostics do not describe the failure you have encountered. By using this function you can register a more suitable diagnostic with libltdl, and subsequently use the returned integer as an argument to lt_dlseterror.

libltdl provides several other functions which you may find useful when writing a custom module loader. These are covered in the Libtool manual, along with more detailed descriptions of the functions described in the preceding paragraphs.

In the next chapter, we will discuss the more complex features of Automake, before moving on to show you how to use those features and add libltdl module loading to the Sic project from 12. A Large GNU Autotools Project in the chapter after that.


This document was generated by Gary V. Vaughan on February, 8 2006 using texi2html

 
 
  Published under the terms of the Open Publication License Design by Interspire