On Mon, Feb 29, 2016 at 05:59:44PM -0500, Mike Frysinger wrote: > On 29 Feb 2016 15:56, Rich Felker wrote: [...] > > The attached (very hackish at the moment) patch makes it work for me > > by eliminating the need to define NOMMU_SYSTEM to 1 and using clone() > > with CLONE_VM and a new stack for the child, instead of vfork. I see > > some potential issues that need to be addressed before this could be > > made into a proper solution, though: > > > > 1. I'm not sure if all NOMMU systems strace supports have clone. If > > so, I think vfork could be dropped completely and this used > > instead. > > uClibc has long required clone, so seems safe to assume it exists
strace assumes that PTRACE_SETOPTIONS works, which essentially means that linux kernel >= 2.6 is required. On some architectures, newer kernel is required (e.g. >= 2.6.15 on mips for PTRACE_GETREGS support). I don't know for sure whether all supported NOMMU systems have CLONE_VM, but I agree with Mike it seems safe to assume they do. -- ldv
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