On Fri, 27 May 2022 23:02:46 +0200 Rubén Llorente <port...@use.startmail.com> wrote:
> I have also shamelessly copied the mechanism sort uses for rising its > RDATA_LIMIT and tests so far look good. Still I have to figure out how > to do the same thing with the stack size. > > Also, how portable are setrlimit and getrlimit? Eventually we should get > this patch submitted upstream. Not portable: other Unix clones have setrlimit, but the meaning of RDATA_LIMIT is different. In some systems, RDATA_LIMIT only limits sbrk(2), so one can bypass the limit by using anonymous mmap(2) to allocate memory. OpenBSD is more strict, because our RDATA_LIMIT counts both sbrk(2) and anonymous mmap(2). malloc(3) probably uses anonymous mmap(2), so those other systems allow malloc(3) to take gigabytes of memory from anonymous mmap(2) while ignoring RDATA_LIMIT. For stack size, I'm not sure. If you are on the main thread, try RLIMIT_STACK. If you are on another thread, try pthread_attr_setstacksize(3).
