On FreeBSD the hard coded 'make' will switch to BSD make rather
than the outer configure make - GNU make.
Similarly for systems with gcc and clang installed then an outer
'configure CC=clang' and then make auxchecks doesn't propagate
the CC to the inner gsl configure, which will use gcc.
Still need some work on the tarball checksum calculation.
I think that these are all now done.
This commit refactors memalign and updates manual-core.xml
to say some behaviour of Valgrind depends on the build time
OS and libraries.
The number of errors for arguments that gets triggered depends
on how GCC optimzes and generates code for the vg_replace_malloc.c
wrappers. PPC seems to trigger more than amd64.
It returns NULL and 0 status whilst most other platforms
allocatae some undefined amount of memory (which is allowed
by posix).
Update the posix_memalign test as well.
Finally remove some clang warnings about alignment.
I had another look at the XNU source and this does seem to exist.
The manpage says that it is the zone version of posix_memalign,
though that's probably more because Darwin has no memalign.
This is the first part of
Bug 466104 aligned_alloc problems, part 1
The bulk of this change is try try to get memalign to be more
platform aware. Previously the Valgrind implementation only
reflected the glibc implementation. That meant non-power of
two alignment values would silently get bumped up to the
next largest power of two. Most other platforms return NULL
and set errno to EINVAL.
There are a few other changes. A couple of the other aligned alloc
functions like valloc were caling the Valgrind memalign. This meant
that there weould be an extra Valgrind memalign in any error
callstacks. Now these functions call the allocator directly.
The memcheck memalign2 testcase has been redone. The memalign
parts moved out to per-platform versions and the tescase
itdelf renamed to posix_memalign, since that is all that is left.
I also modified the testcase so that it checks that the
memalign calls check for non-NULL returns, and on platforms
that set errno that it is correctly set. Previously the
test only worked on non-glibc because NULL & alignment is
zero. The platform versions have been tested on glibc,
MUSL, FreeBSD and OpenIndiana and should hopefully run OK
both under memcheck and standalone.
There is stil quite a lot that is NOT done
1. I'm not certain that implementations allocate more memory
and/or use a wider alignment. It doesn't help that almost
universally the memalign implementations are badly
documented, undocumented or buggy.
2. We don't handle very large alignment requests well.
Most implementations will fail and set EINVAL if the
alignment is over half the memory space. Valgrind will
core panic if an aligmnt of over 16Mbytes is requested.
3. We don't generate any memcheck errors for invalid values
of alignment. That's planned in Part 2.
4. The code is static and fixed at compile time. That means that
if you are using MUSL with a glibc-built Valgrind you
will still get glibc memalign behaviour.
I'll wait to see if there are any requests before trying
to make the behaviour selectable at runtime.
rfork() is barely used in base FreeBSD. The main use
is in posix_spawn(). If rfork() fails with EINVAL
then it falls back to using vfork(). This is preferable
to Valgrind bombing.
ksh93 uses posix_spawn. I tested bash and csh and they had
no problems.
Also add 'hello world" smoke tests for bash csh and ksh
musl doesn't have sys/poll.h
GCC moans and then uses poll.h
On glibc linux and FreeBSD poll.h is a symlink to sys/poll.h
Illumos poll.h includes sys/poll.h
The hard coded memory mapping trigger drd_start_using_mem_w_perms
which will lead to tl_assert(vg_tid != VG_INVALID_THREADID);
But vg_tid was just set to VG_INVALID_THREADID before the
hard coded memory map.
