Function syscall::call::brk

pub unsafe fn brk(addr: usize) -> Result<usize>

Set the end of the process's heap

When addr is 0, this function will return the current break.

When addr is nonzero, this function will attempt to set the end of the process's heap to addr and return the new program break. The new program break should be checked by the allocator, it may not be exactly addr, as it may be aligned to a page boundary.

On error, Err(ENOMEM) will be returned indicating that no memory is available