A little self promotion but mostly because it addresses some of the other commenters concerns about malloc (or the lower-level api around sbrk): a couple years

A little self promotion but mostly because it addresses some of the other commenters concerns about malloc (or the lower-level api around sbrk): a couple years ago I wrote rt0 [0], a small (mostly minimal) C runtime for i386 & amd64 that makes it easier to replace libc & crt0 (as long as you have the kernel headers installed). Also, as part of the examples, I wrote wrappers around the sbrk syscall. Pretty easy to do and all documented in the repo. I expect to eventually port the lib to arm (raspberry pi) and aarm64. There's also lots of references to other small c runtimes. I'll be adding this one as well. [0] https://github.com/lpsantil/rt0 https://github.com/lpsantil/rt0