Re: d_off field in struct dirent and 32-on-64 emulation
From: Joseph Myers
Date: Mon Dec 31 2018 - 12:04:06 EST
On Fri, 28 Dec 2018, Adhemerval Zanella wrote:
> >> Currently we only have nios2 and csky (unfortunately). But since generic
> >> definition for off_t and off64_t still assumes non-LFS support, all new
> >> 32-bits ports potentially might carry the issue.
> > For csky, we could still change the type of the non-standard d_off
> > field to long long int. This way, only telldir would have to fail
> > when truncation is necessary, as mentioned below:
> I think it makes no sense to continue making non-LFS as default for
> newer 32 bits ports, the support will be emulated with LFS syscalls.
Any new 32-bit port that uses 64-bit time_t will also use 64-bit offsets
(because we don't have any glibc configurations that support the
combination of 64-bit time with 32-bit offsets, and don't want to add
them). That should apply for RISC-V 32-bit at least.
I've filed <https://sourceware.org/bugzilla/show_bug.cgi?id=24050> for
missing overflow checks in telldir when the default off_t is wider than
long int (currently just applies to x32; not sure why we don't see glibc
test failures on x32 resulting from the quiet truncation, as the issue is
certainly there in the source code).
Joseph S. Myers