This is not a good idea. You're venturing in the unspecified/non-portable behavior territory. https://pubs.opengroup.org/onlinepubs/7908799/xsh/brk.html https:

This is not a good idea. You're venturing in the unspecified/non-portable behavior territory. https://pubs.opengroup.org/onlinepubs/7908799/xsh/brk.html https://pubs.opengroup.org/onlinepubs/7908799/xsh/brk.html > The behaviour of brk() and sbrk() is unspecified if an application also uses any other memory functions (such as malloc(), mmap(), free()). Other functions may use these other memory functions silently.