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/*
* Copyright © Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 or 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* As suggested by umockdev, _FILE_OFFSET_BITS breaks our open() interposing,
* as it results in a (platform dependent!) subset of {__open64, __open64_2,
* __open, __open_2} being defined (not just declared) in the header, causing
* the build to fail with duplicate definitions.
*/
#include "mir_test_framework/mmap_wrapper.h"
#include "mir_test_framework/interposer_helper.h"
#include <boost/throw_exception.hpp>
#include <dlfcn.h>
namespace mtf = mir_test_framework;
namespace
{
using MmapInterposer = mtf::InterposerHandlers<void*, void *, size_t, int, int, int, off_t>;
using MunmapInterposer = mtf::InterposerHandlers<int, void*, size_t>;
}
mtf::MmapHandlerHandle mtf::add_mmap_handler(MmapHandler handler)
{
return MmapInterposer::add(std::move(handler));
}
void* mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset)
{
if (auto val = MmapInterposer::run(addr, length, prot, flags, fd, offset))
{
return *val;
}
static void* (*real_mmap)(void *addr, size_t length, int prot, int flags, int fd, off_t offset);
// Where mmap64 is defined, even if off_t == off64_t on 64-bit platforms, this is still appropriate.
if (!real_mmap)
{
*(void **)(&real_mmap) = dlsym(RTLD_NEXT, "mmap64");
}
// Empirically, mmap64 is NOT defined everywhere, but then this is appropriate
if (!real_mmap)
{
*(void **)(&real_mmap) = dlsym(RTLD_NEXT, __func__);
}
if (!real_mmap)
{
using namespace std::literals::string_literals;
// Oops! What has gone on here?!
BOOST_THROW_EXCEPTION((std::runtime_error{"Failed to find mmap() symbol: "s + dlerror()}));
}
return (*real_mmap)(addr, length, prot, flags, fd, offset);
}
mtf::MunmapHandlerHandle mtf::add_munmap_handler(MunmapHandler handler)
{
return MunmapInterposer::add(std::move(handler));
}
int munmap(void *addr, size_t length)
{
if (auto val = MunmapInterposer::run(addr, length))
{
return *val;
}
int (*real_munmap)(void *addr, size_t length);
*(void **)(&real_munmap) = dlsym(RTLD_NEXT, "munmap");
if (!real_munmap)
{
using namespace std::literals::string_literals;
// Oops! What has gone on here?!
BOOST_THROW_EXCEPTION((std::runtime_error{"Failed to find munmap() symbol: "s + dlerror()}));
}
return (*real_munmap)(addr, length);
}
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