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    <p>On mach, you have to use <code>DYLD_INSERT_LIBRARIES</code> macro instead of <code>LD_PRELOAD</code> to specify a list of shared libraries to pre-load (1...*).</p> <p>By default, standard functions are not getting replaced with functions from the shared objects just because they have the same names. You have to explicitly state what function overrides what using <a href="http://www.opensource.apple.com/source/dyld/dyld-132.13/include/mach-o/dyld-interposing.h" rel="nofollow">DYLD_INTERPOSE</a> macro. It allows you to declare a replacement function with any name (for example, override <code>open</code> with <code>my_open</code>) and be able to call original function you are overriding. In addition to that, you don't have to resolve addresses of real functions manually.</p> <p>Alternatively, to achieve Linux-like behavior you have to define <code>DYLD_FORCE_FLAT_NAMESPACE</code> macro.</p> <p>There is a lot more going on, see <a href="http://www.manpagez.com/man/1/dyld/" rel="nofollow">dyld</a> manual for details.</p> <p>So your code should look something like this:</p> <pre><code>#define _GNU_SOURCE #include &lt;stdint.h&gt; #include &lt;stdio.h&gt; #include &lt;string.h&gt; #include &lt;stdarg.h&gt; #include &lt;dlfcn.h&gt; #include &lt;mach-o/dyld-interposing.h&gt; /** * Interponemos nuestra funcion open * * @param char* filename * @param int flags **/ int my_open(char * filename, int flags) { // Entero int p = open(filename, flags); fprintf(stderr, "Abrimos %s) = %i\n", filename, flags); // Devolvemos return p; } DYLD_INTERPOSE(my_open, open) //-------------------------------------------------------- /** * Interponemos nuestra funcion malloc * * @param size_t size */ void* my_malloc(size_t size) { void *p = malloc(size); // Memoria reservada fprintf(stderr, "Reserva de memoria (%d) = %p\n", size, p); // Devolvemos return p; } DYLD_INTERPOSE(my_malloc, malloc) </code></pre>
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    1. POAnsi C patch using dlsym compiles OK under linux but fails on Mac Os X
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    1. COI got it working :-) Thank you very much!! Dyld is also useful for class interposing? :)
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    2. CO@flaab You are welcome. This probably won't be useful for classes due to name mangling (depending on class name, namespace etcetera). Technically it is possible to override a class's method but that would be near impossible to support as name mangling is not standardized.
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    3. COHello Vlad :) I have managed to replace functions no problem. what I really need now is overriding a specific function of a class.
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