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POC Segmentation fault in struct. Code translated from Matlab->C with Matlab Coder
 

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  1. POC Segmentation fault in struct. Code translated from Matlab->C with Matlab Coder
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    <p>I am translating some Matlab functions to C with Matlab Coder. Everything works to the point, where i want to return an array(transposed vector) from my function.</p> <p>In Matlab I have a function:</p> <pre><code>function returnedArray = myFun(input arguments) &lt;function code&gt; </code></pre> <p>This call to the function in C gets translatet to:</p> <pre><code>void myFun(input arguments, emxArray_realT *returnedArray) &lt;function code&gt; </code></pre> <p>emxArray_real_T is a struct, that was generated by Matlab Coder:</p> <pre><code>struct emxArray_real_T { real_T *data; int32_T *size; int32_T allocatedSize; int32_T numDimensions; boolean_T canFreeData; }; </code></pre> <p>And real_T, int32_T... are created generic type definitions:</p> <pre><code>typedef double real_T; </code></pre> <p>I call this myFun from main:</p> <pre><code>struct emxArray_real_T *result = malloc(sizeof(struct emxArray_real_T)); myFun(input arguments, result); </code></pre> <p>When i run this, i get an error saying: Segmentation fault. gdb gave me this:</p> <pre><code>Program received signal SIGSEGV, Segmentation fault at: 99643: i0=retArray-&gt;size[0]; p retArray $1 = (emxArray_real_T *) 0xc1d010 p retArray.size $2 = (int32_T *) 0x0 p retArray.size[0] Cannot access memora ar adress 0x0 </code></pre> <p>Am i doing something wrong in my main function? I hope so, because translated code from Matlab in C is a mess, or maybe just for me as a novice. The code works fine, if I translate and compile it in C without the return value.</p>
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    1. COThis looks like the `retArray` is not initialized properly, since it's `size` member points to 0 instead of an allocated `int32_T`. It would help, if you could provide us with your whole code. -- Edit: not your own code, but the generated :p
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      1. POC Segmentation fault in struct. Code translated from Matlab->C with Matlab Coder
      1. USMax Truxa
    2. COThis could be tricky, because there is more than 100000 lines in this function. But you assume there could be a problem in code translated with Matlab Coder?
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      1. POC Segmentation fault in struct. Code translated from Matlab->C with Matlab Coder
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    3. COI just realized I am looking right at the error.
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      1. POC Segmentation fault in struct. Code translated from Matlab->C with Matlab Coder
      1. USMax Truxa
 

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