Platform - Linux  I have a typical requirement, where I need to give higher priority to my function then system provided function.  Lets say I have a third party library or executable. It calls many system functions such strcpy or strlen etc. I can not modify the executable/library as I do not have access to code.  Now I have implemented my own strlen or strcpy functions. When the third party library or executable is executing it should call my functions instead of system library functions.   Is it possible. If yes, can somebody guide me how to do this.  LD_PRELOAD trial result  As per suggestion here, I tried with LD_PRELOAD. I tried to override malloc function.      #include &lt;string.h&gt;      void *malloc(int size)     {         void *ptr = NULL;         printf("Inside my malloc function\n");         ptr = malloc(size);         return ptr;     }   I put the above code in a c file and built mem.so file and executed below command.     export LD_PRELOAD=./mem.so   So now I have overwritten malloc function.  If execute ls or clear command I get below result, which is logical.  Inside my malloc function Inside my malloc function Inside my malloc function Inside my malloc function Inside my malloc function   It looks my overloaded malloc function is invoked recursively. Only one time call I need. How can I achieve that.
I came across a reference to it recently on  and (as of now) it is not explained.  I suspect  might be it, but I don't know for sure.
If you cast Blindness/Deafness as a 3rd level spell, can you target one creature with both effects? My question is pretty simple.  Since $n! \gt n!!$, it's clear by the comparison test that $\sum_{n=0}^\infty \frac {1}{n!!}$ converges.      But what value does the sum converge to? How does one go about determining its value (if possible)? Motivation for spectral graph theory. Elevated Priviliges for Startup Applications in Windows? Is there any way to configure application that requires administrator privilages (elevation) so it's automatically started with elevated privileges and does not request elevation on every startup?  For example, I have Riva Tuner that always starts with Windows. And it always asks for elevation via UAC. I need Riva Tuner to silently start with elevated privileges and without any message from user account control (without disabling it). I would like to restore LightDM to its default state, because for some reason /etc/lightdm/unity-greeter.conf is now an empty file.  Deleting /etc/lightdm/unity-greeter.conf and then running sudo apt-get install --reinstall unity-greeter doesn't create a new config file as you might expect.   How can I restore a missing config file? How would I be able to create a grill of sorts found on the front of some computer cases such as this one In Avengers: Endgame,       Thanos was able to stop and catch Mjolnir and Stormbreaker mid-air as both Captain America and Thor used/called them BEFORE he got the Infinity Stones.   Since this character is clearly not worthy and had no super powers at the time, how were they able to wield Thor's Mjolnir and Stormbreaker, when even the Hulk couldn't do it in The Avengers? Just doing this for revision, seems much harder than it should be, should I use $x=\tan u$ ? Any help appreciated. If I my motherboard is SATAI, can it use SATAII hard drives? Top of answer covered by sticky top bar after clicking direct link With the introduction of the network-wide sticky top bar , I noticed a bug that's happening on every site (except for Stack Overflow). When you click on an answer link (of the form https://site.stackexchange.com/a/####), the very top of the answer and the upvote button are covered by the top bar:    Stack Overflow shows the correct behavior: Can I use Minecraft PC textures and worlds in Pocket Edition? Now that I've discovered that I can host a , I'd like to know if is it possible to use the textures and maps of the PC version for the pocket version.  I'm planning to visit Peru and Machu Picchu. It would be really cool to entice them for the voyage by letting them play a  in their favourite video game. Unfortunately, this God of Deceit world looks really sophisticated. I don't believe the Pocket Edition would be able to play it. How can I find just the *.mp3 files with a recursive command like ls -R *.mp3 in a directory that contains several sub-directories and at the end copy these files in a directory that I choose.  Thanks for your support. Move EFI System Partition to another drive In an hydrogen-like atoms the orbitals are solutions to the Schrodinger equation suitable for the problem.  They describe the regions where an electron can be found.  So, why don't they have spherical symmetric?  As in this picture:    Why, in a certain distance from the nucleus, are there points where an electron can be found, and points where it can't?  EDIT: Is there any intuation about the symmetry breaking? i have a tiny little problem with xslt, js and html entities, eg. within a template:  &lt;script type="text/javascript"&gt;     &lt;xsl:value-of select="/some/node"/&gt;     for (var i = 0; i &amp;lt; 5; i++) {         //            ^^^ js error     } &lt;/script&gt;  &lt;script type="text/javascript"&gt;     &lt;xsl:value-of select="/some/node"/&gt;     for (var i = 0; i &lt; 5; i++) {         //            ^ xslt error     } &lt;/script&gt;  &lt;script type="text/javascript"&gt;     &lt;xsl:value-of select="/some/node"/&gt;     // &lt;![CDATA[     for (var i = 0; i &lt; 5; i++) {         //            ^ becomes &amp;lt;     }     // ]]&gt; &lt;/script&gt;   &lt;script type="text/javascript"&gt;     &lt;xsl:value-of select="/some/node"/&gt;     for (var i = 0; i &lt;xsl:value-of disable-output-escaping="yes" select="string('&amp;lt;')"/&gt; 5; i++) {         // works of course     } &lt;/script&gt;   does anyone have an idea where my problem could come from? i always thought the xslt processor would leave the content of a &lt;script/&gt; element unescaped when using the html output method ...  i run libxslt2 version 1.1.24 on OSX which was installed using macportsports ... Why is absolute value  function   not a polynomial?   I need  a clear  answer to this question please,?  Why couldn't we consider absolute value function as a polynomial? Can we build capacitors on a PCB board? For the magnitude of nF or µF capacitors, I hope I can build them on a PCB board. The capacitor is like a two metal layer and something between them.   Is this possible?   Not buying the capacitor, just design the capacitor on the PCB board. Double metal layers on the PCB board. I am using Google Spreadsheets to create a matrix (time/activity) as a daily schedule for staff to sign into.  Is there a formula to calculate the number of cells in a column that are shaded (or not shaded) a certain color?  For example: 20 of the cells are gray and 31 are not gray (shaded any other color) and instead of manually counting them, it calculates this at the bottom of reach column. In the Android app, left sidebar, there is an editable list of "Your Sites". In the editing pane, the sites are re-orderable (although awkwardly), and the order one places the sites in there is preserved, even after quitting the app and returning to this pane. One expects that order to be reflected in the "Your Sites" portion of the left sidebar when the editing pane is closed, but it is not.  I'm not sure what is determining the order of the sites in the left sidebar, it doesn't seem to be by date they were "pinned" into the list one wants to show, either. Find the cardinality of the quotient of $\mathbb R$ in respect to R R is an equivalence relation defined as $xRy \Leftrightarrow a - b$ is an integer.  What is the cardinality of the quotient of $\mathbb R$ in respect to R? How would you prove it?  I thought about a bijection between $[0,1)$ to the quotient of $\mathbb R$ in respect to R, but can't figure out to prove it formally.