Bibliography 1. In fact, that is not always simple and needs some explanation. Disclaimer No liability for the contents of this document can be accepted. Use the concepts, examples and information at your own risk. There may be errors and inaccuracies, that could be damaging to your system. Proceed with caution, and although this is highly unlikely, the author s do not take any responsibility.
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Bibliography 1. In fact, that is not always simple and needs some explanation. Disclaimer No liability for the contents of this document can be accepted.
Use the concepts, examples and information at your own risk. There may be errors and inaccuracies, that could be damaging to your system. Proceed with caution, and although this is highly unlikely, the author s do not take any responsibility. All copyrights are held by their by their respective owners, unless specifically noted otherwise. Use of a term in this document should not be regarded as affecting the validity of any trademark or service mark.
Naming of particular products or brands should not be seen as endorsements. You know who you are! Feedback Feedback is most certainly welcome for this document. Terms Used in this Document dlopen API The dlclose, dlerror, dlopen and dlsym functions as described in the dlopen 3 man page. The Problem At some time you might have to load a library and use its functions at runtime; this happens most often when you are writing some kind of plug-in or module architecture for your program.
These symbols are special text strings that uniquely identify a function in the program, library, or object file. In C, the symbol name is the same as the function name: the symbol of strcpy will be strcpy, and so on.
This is possible because in C no two non-static functions can have the same name. Or it might not even contain the word "foo". Even if you worked out how your particular compiler mangles names and would thus be able to load functions via dlsym , this would most probably work with your compiler only, and might already be broken with the next version.
Classes Another problem with the dlopen API is the fact that it only supports loading functions. Obviously, to use that class you need to create an instance of it, but that cannot be easily done.
The Solution 3. A function declared as extern "C" uses the function name as symbol name, just as a C function. For that reason, only non-member functions can be declared as extern "C", and they cannot be overloaded. Although there are severe limitations, extern "C" functions are very useful because they can be dynamically loaded using dlopen just like a C function. The functions you want to load must be qualified as extern "C" to avoid the symbol name being mangled. Example 1. Loading a Function main.
The first inline form is a declaration with extern linkage and with C language linkage; the second only affects language linkage. If you declare variables, keep in mind that extern "C" int foo;.
C DLOPEN MINI-HOWTO PDF
What do I overlook? There may be errors and inaccuracies, that could be damaging to your system. Post as a guest Name. Email Required, but never shown. Windows dlolen something different LoadLibrary and an inferior linking model; you dlpoen to explicitly annotate the functions concerned, provided, or used by plugins. The original question was about shared libraries only via comments did we find it was about plugin shared libraries. Each function will have a specific name and mini-hoqto components must have those functions.
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C++ dlopen mini HOWTO 中译版