Try running your VM with "-help" and/or check the man page (sorry to be vague, I'm not able to check right now). You should be able to start the VM with malloc to allocate the heap rather than mmap, which should get you around the problem. I can't recall the parameter but it should be in the -help.
Dave
On Thu, Dec 17, 2015 at 1:43 AM, Ben Coman btc@openinworld.com wrote:
I'm having a go at getting this working with the Spur svn sources per... http://www.mirandabanda.org/cogblog/compiling-the-vm/
@Eliot, I am currently stuck on Spur's requirement for mmap. Could you describe this requirement and any ideas on path to proceed to check compatibilty with these...
https://github.com/rumpkernel/wiki/wiki/Info:-FAQ says "For simplicity reasons, the Rumprun unikernel does not support virtual memory -- unnecessary in a unikernel -- nor does it support signals the traditional way. That means that programs which absolutely depend on things like fork(),execve(), mmap() and sigaction() may not work correctly. In some cases we provide a small amount of cheap emulation for common cases (e.g. mmap(MAP_ANON))"
http://rumpkernel.org/misc/usenix-login-2014/login_1410_03_kantee.pdf says "The more or less only negative effect caused by the lack of virtual memory support is that the mmap() system call cannot be fully handled by a rump kernel. A number of workarounds are possible for applications that absolutely need to use mmap(). For example, the bozohttpd Web server uses mmap() to read the files it serves, so when running bozohttpd on top of a rump kernel, we simply read the mmapâd window into memory at the time the mapping is made instead of gradually faulting pages in. A perfect emulation of mmap() is hard to achieve, but one that works for most practical purposes is easy to achieve"
cheers -ben
P.S. Here is the compilation error...
platforms/unix/vm/sqUnixSpurMemory.c:72:3: error: #error "Spur requires mmap" # error "Spur requires mmap" ^ platforms/unix/vm/sqUnixSpurMemory.c: In function âsqAllocateMemoryâ: platforms/unix/vm/sqUnixSpurMemory.c:108:47: warning: passing argument 3 of âsqAllocateMemorySegmentOfSizeAboveAllocatedSizeIntoâ from incompatible pointer type (roundUpToPage(desiredHeapSize), address, &allocBytes); ^ In file included from platforms/unix/vm/sqUnixSpurMemory.c:33:0: platforms/Cross/vm/sq.h:88:14: note: expected âsqInt *â but argument is of type âlong unsigned int *â extern void *sqAllocateMemorySegmentOfSizeAboveAllocatedSizeInto(sqInt sz, void *minAddr, sqInt *asp); ^ Makefile:276: recipe for target 'sqUnixSpurMemory.o' failed make[1]: *** [sqUnixSpurMemory.o] Error 1 Makefile:407: recipe for target 'vm/vm.a' failed make: *** [vm/vm.a] Error 2