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#include <AK/StringBuilder.h>
#include <Kernel/FileSystem/DevPtsFS.h>
#include <Kernel/FileSystem/VirtualFileSystem.h>
#include <Kernel/TTY/SlavePTY.h>
NonnullRefPtr<DevPtsFS> DevPtsFS::create()
{
return adopt(*new DevPtsFS);
}
DevPtsFS::DevPtsFS()
{
}
DevPtsFS::~DevPtsFS()
{
}
static HashTable<unsigned>* ptys;
bool DevPtsFS::initialize()
{
if (ptys == nullptr) {
ptys = new HashTable<unsigned>();
}
m_root_inode = adopt(*new DevPtsFSInode(*this, 1));
m_root_inode->m_metadata.inode = { fsid(), 1 };
m_root_inode->m_metadata.mode = 0040555;
m_root_inode->m_metadata.uid = 0;
m_root_inode->m_metadata.gid = 0;
m_root_inode->m_metadata.size = 0;
m_root_inode->m_metadata.mtime = mepoch;
return true;
}
static unsigned inode_index_to_pty_index(unsigned inode_index)
{
ASSERT(inode_index > 1);
return inode_index - 2;
}
static unsigned pty_index_to_inode_index(unsigned pty_index)
{
return pty_index + 2;
}
InodeIdentifier DevPtsFS::root_inode() const
{
return { fsid(), 1 };
}
RefPtr<Inode> DevPtsFS::create_inode(InodeIdentifier, const String&, mode_t, off_t, dev_t, uid_t, gid_t, int& error)
{
error = -EROFS;
return nullptr;
}
RefPtr<Inode> DevPtsFS::create_directory(InodeIdentifier, const String&, mode_t, uid_t, gid_t, int& error)
{
error = -EROFS;
return nullptr;
}
RefPtr<Inode> DevPtsFS::get_inode(InodeIdentifier inode_id) const
{
if (inode_id.index() == 1)
return m_root_inode;
unsigned pty_index = inode_index_to_pty_index(inode_id.index());
auto* device = Device::get_device(201, pty_index);
ASSERT(device);
auto inode = adopt(*new DevPtsFSInode(const_cast<DevPtsFS&>(*this), inode_id.index()));
inode->m_metadata.inode = inode_id;
inode->m_metadata.size = 0;
inode->m_metadata.uid = device->uid();
inode->m_metadata.gid = device->gid();
inode->m_metadata.mode = 0020600;
inode->m_metadata.major_device = device->major();
inode->m_metadata.minor_device = device->minor();
inode->m_metadata.mtime = mepoch;
return inode;
}
void DevPtsFS::register_slave_pty(SlavePTY& slave_pty)
{
ptys->set(slave_pty.index());
}
void DevPtsFS::unregister_slave_pty(SlavePTY& slave_pty)
{
ptys->remove(slave_pty.index());
}
DevPtsFSInode::DevPtsFSInode(DevPtsFS& fs, unsigned index)
: Inode(fs, index)
{
}
DevPtsFSInode::~DevPtsFSInode()
{
}
ssize_t DevPtsFSInode::read_bytes(off_t, ssize_t, u8*, FileDescription*) const
{
ASSERT_NOT_REACHED();
}
ssize_t DevPtsFSInode::write_bytes(off_t, ssize_t, const u8*, FileDescription*)
{
ASSERT_NOT_REACHED();
}
InodeMetadata DevPtsFSInode::metadata() const
{
return m_metadata;
}
bool DevPtsFSInode::traverse_as_directory(Function<bool(const FS::DirectoryEntry&)> callback) const
{
if (identifier().index() > 1)
return false;
callback({ ".", 1, identifier(), 0 });
callback({ "..", 2, identifier(), 0 });
for (unsigned pty_index : *ptys) {
String name = String::number(pty_index);
InodeIdentifier identifier = { fsid(), pty_index_to_inode_index(pty_index) };
callback({ name.characters(), name.length(), identifier, 0 });
}
return true;
}
size_t DevPtsFSInode::directory_entry_count() const
{
ASSERT(identifier().index() == 1);
return 2 + ptys->size();
}
InodeIdentifier DevPtsFSInode::lookup(StringView name)
{
ASSERT(identifier().index() == 1);
if (name == "." || name == "..")
return identifier();
bool ok;
unsigned pty_index = name.to_uint(ok);
if (ok && ptys->contains(pty_index)) {
return { fsid(), pty_index_to_inode_index(pty_index) };
}
return {};
}
void DevPtsFSInode::flush_metadata()
{
}
KResult DevPtsFSInode::add_child(InodeIdentifier, const StringView&, mode_t)
{
return KResult(-EROFS);
}
KResult DevPtsFSInode::remove_child(const StringView&)
{
return KResult(-EROFS);
}
KResult DevPtsFSInode::chmod(mode_t)
{
return KResult(-EPERM);
}
KResult DevPtsFSInode::chown(uid_t, gid_t)
{
return KResult(-EPERM);
}
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