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    <blockquote> <p>When a program starts to use a certain amount of memory, like 100MB, I want an interrupt to be triggered that will cause a function to run.</p> </blockquote> <p>Depending on requirements. If capturing malloc calls is enought you might be interested:</p> <ul> <li><a href="http://www.jayconrod.com/cgi/view_post.py?23" rel="nofollow noreferrer">Tutorial: Function Interposition in Linux</a> , an example how to make you own malloc substitute, here another relared tutorial : <a href="http://www.ibm.com/developerworks/linux/library/l-memory/index.html" rel="nofollow noreferrer">Inside memory management</a></li> <li><a href="https://stackoverflow.com/questions/262439/create-a-wrapper-function-for-malloc-and-free-in-c">Create a wrapper function for malloc and free in C - stackoverflow.com</a> , especially <a href="http://www.gnu.org/software/libtool/manual/libc/Hooks-for-Malloc.html" rel="nofollow noreferrer">malloc hooks</a></li> <li><a href="http://en.wikipedia.org/wiki/Mtrace" rel="nofollow noreferrer">mtrace at GNU C Library.</a></li> </ul> <p>If, you'd like to capture <a href="http://www.kernel.org/doc/man-pages/online/pages/man2/brk.2.html" rel="nofollow noreferrer">brk(2)</a> as well - (<a href="http://www.linuxjournal.com/article/6390" rel="nofollow noreferrer">related article</a>) , you might like to follow in some of tracing solution</p> <ul> <li>ptrace()</li> <li><a href="http://dev.exherbo.org/~alip/pinktrace/" rel="nofollow noreferrer">pinktrace</a></li> </ul> <p>or binary instrumentation</p> <ul> <li><a href="http://valgrind.org/" rel="nofollow noreferrer">Valgrind</a></li> </ul>
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