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#include <Kernel/SharedMemory.h>
#include <Kernel/VM/VMObject.h>
#include <Kernel/Lock.h>
#include <Kernel/Process.h>
#include <AK/HashMap.h>
Lockable<HashMap<String, RetainPtr<SharedMemory>>>& shared_memories()
{
static Lockable<HashMap<String, RetainPtr<SharedMemory>>>* map;
if (!map)
map = new Lockable<HashMap<String, RetainPtr<SharedMemory>>>;
return *map;
}
KResultOr<Retained<SharedMemory>> SharedMemory::open(const String& name, int flags, mode_t mode)
{
UNUSED_PARAM(flags);
LOCKER(shared_memories().lock());
auto it = shared_memories().resource().find(name);
if (it != shared_memories().resource().end()) {
auto shared_memory = it->value;
// FIXME: Improved access checking.
if (shared_memory->uid() != current->process().uid())
return KResult(-EACCES);
return *shared_memory;
}
auto shared_memory = adopt(*new SharedMemory(name, current->process().uid(), current->process().gid(), mode));
shared_memories().resource().set(name, shared_memory.ptr());
return shared_memory;
}
KResult SharedMemory::unlink(const String& name)
{
LOCKER(shared_memories().lock());
auto it = shared_memories().resource().find(name);
if (it == shared_memories().resource().end())
return KResult(-ENOENT);
shared_memories().resource().remove(it);
return KSuccess;
}
SharedMemory::SharedMemory(const String& name, uid_t uid, gid_t gid, mode_t mode)
: m_name(name)
, m_uid(uid)
, m_gid(gid)
, m_mode(mode)
{
}
SharedMemory::~SharedMemory()
{
}
KResult SharedMemory::truncate(int length)
{
if (!length) {
m_vmo = nullptr;
return KSuccess;
}
if (!m_vmo) {
m_vmo = VMObject::create_anonymous(length);
return KSuccess;
}
// FIXME: Support truncation.
ASSERT_NOT_REACHED();
return KResult(-ENOTIMPL);
}
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