mailing list of musl libc

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 #include <limits.h>
#include "syscall.h"

long __syscall_brk(long arg1, ...)
{
  unsigned long newbrk = (unsigned long)arg1;
  unsigned long pages = __builtin_wasm_current_memory();
  if (newbrk % PAGE_SIZE)
    goto end;
  unsigned long new_pages = newbrk / PAGE_SIZE;
  if (new_pages <= pages || new_pages >= (0xffffffffu / PAGE_SIZE))
    goto end;
  if (__builtin_wasm_grow_memory(new_pages - pages) != (unsigned long)-1)
    pages = new_pages;
  end:
  return pages * PAGE_SIZE;
}