title: how do you do system call interrupts in C?
body: <p>I learned from <a href="http://download.savannah.gnu.org/releases/pgubook/ProgrammingGroundUp-1-0-booksize.pdf" rel="nofollow">download.savannah.gnu.org/.../ProgrammingGroundUp-1-0-booksize.pdf</a>
  that programs interrupt the kernel, and that is how things are done. What I want to know is how you do that in C (if it's possible)</p>