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copied!<p>Read the <a href="http://man7.org/linux/man-pages/man3/dlopen.3.html" rel="noreferrer">dlopen(3)</a> man page (e.g. by typing <code>man dlopen</code> in a terminal on your machine):</p> <blockquote> <p>If filename contains a slash ("/"), then it is interpreted as a (relative or absolute) pathname. Otherwise, the dynamic linker searches for the library as follows (see ld.so(8) for further details):</p> </blockquote> <pre><code> o (ELF only) If the executable file for the calling program contains a DT_RPATH tag, and does not contain a DT_RUNPATH tag, then the directories listed in the DT_RPATH tag are searched. o If, at the time that the program was started, the environment variable LD_LIBRARY_PATH was defined to contain a colon-separated list of directories, then these are searched. (As a security measure this variable is ignored for set-user-ID and set-group-ID programs.) o (ELF only) If the executable file for the calling program contains a DT_RUNPATH tag, then the directories listed in that tag are searched. o The cache file /etc/ld.so.cache (maintained by ldconfig(8)) is checked to see whether it contains an entry for filename. o The directories /lib and /usr/lib are searched (in that order). </code></pre> <p>So you need to call <code>dlopen("./libLibraryName.so", RTLD_NOW)</code> -not just <code>dlopen("libLibraryName.so", RTLD_NOW)</code> which wants your plugin to be in your <code>$LD_LIBRARY_PATH</code> on in <code>/usr/lib/</code> etc .... - or add <code>.</code> to your <code>LD_LIBRARY_PATH</code> (which I don't recommend for security reasons).</p> <p>As <a href="https://stackoverflow.com/a/17715977/841108">Jhonnash answered</a> you should use and display the result of <code>dlerror</code> when <code>dlopen</code> (or <code>dlsym</code>) fails:</p> <pre><code> void* dlh = dlopen("./libLibraryName.so", RTLD_NOW); if (!dlh) { fprintf(stderr, "dlopen failed: %s\n", dlerror()); exit(EXIT_FAILURE); }; </code></pre> <p>You might want to read some books like <a href="http://advancedlinuxprogramming.com/" rel="noreferrer">Advanced Linux Programming</a> to get some knowledge about Linux system programming in general.</p>

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