title: Use of sbrk system call in Unix
body: <p>What is the use of <code>sbrk</code> system call in Unix and how is it to be used in C? Most of them say that <code>malloc</code> uses the <code>sbrk</code> system call to allocate memory. So, how does the <code>sbrk</code> system call allocate memory?  What are the arguments and return type of sbrk?</p>