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Kernel: Implement /proc/<n>/fd

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Bananymous
2025-11-24 00:19:51 +02:00
parent 3207f5d61f
commit 9d0990e5e8
3 changed files with 138 additions and 15 deletions
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45
kernel/include/kernel/FS/ProcFS/Inode.h
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@@ -69,10 +69,6 @@ namespace Kernel
protected:
virtual BAN::ErrorOr<BAN::String> link_target_impl() override;
// You may not write here and this is always non blocking
virtual BAN::ErrorOr<size_t> write_impl(off_t, BAN::ConstByteSpan) override { return BAN::Error::from_errno(EINVAL); }
virtual BAN::ErrorOr<void> truncate_impl(size_t) override { return BAN::Error::from_errno(EINVAL); }
virtual bool can_read_impl() const override { return false; }
virtual bool can_write_impl() const override { return false; }
virtual bool has_error_impl() const override { return false; }
@@ -114,27 +110,54 @@ namespace Kernel
class ProcSymlinkInode final : public TmpInode
{
public:
static BAN::ErrorOr<BAN::RefPtr<ProcSymlinkInode>> create_new(BAN::ErrorOr<BAN::String> (*)(void*), void* data, TmpFileSystem&, mode_t, uid_t, gid_t);
~ProcSymlinkInode() = default;
static BAN::ErrorOr<BAN::RefPtr<ProcSymlinkInode>> create_new(BAN::ErrorOr<BAN::String> (*)(void*), void (*)(void*), void* data, TmpFileSystem&, mode_t, uid_t, gid_t);
~ProcSymlinkInode();
protected:
virtual BAN::ErrorOr<BAN::String> link_target_impl() override;
// You may not write here and this is always non blocking
virtual BAN::ErrorOr<size_t> write_impl(off_t, BAN::ConstByteSpan) override { return BAN::Error::from_errno(EINVAL); }
virtual BAN::ErrorOr<void> truncate_impl(size_t) override { return BAN::Error::from_errno(EINVAL); }
virtual bool can_read_impl() const override { return false; }
virtual bool can_write_impl() const override { return false; }
virtual bool has_error_impl() const override { return false; }
virtual bool has_hungup_impl() const override { return false; }
private:
ProcSymlinkInode(BAN::ErrorOr<BAN::String> (*callback)(void*), void* data, TmpFileSystem&, const TmpInodeInfo&);
ProcSymlinkInode(BAN::ErrorOr<BAN::String> (*callback)(void*), void (*destructor)(void*), void* data, TmpFileSystem&, const TmpInodeInfo&);
private:
BAN::ErrorOr<BAN::String> (*m_callback)(void*);
void (*m_destructor)(void*);
void* m_data;
};
class ProcFDDirectoryInode final : public TmpInode
{
public:
static BAN::ErrorOr<BAN::RefPtr<ProcFDDirectoryInode>> create_new(Process&, TmpFileSystem&, mode_t);
~ProcFDDirectoryInode() = default;
virtual uid_t uid() const override { return m_process.credentials().ruid(); }
virtual gid_t gid() const override { return m_process.credentials().rgid(); }
protected:
virtual BAN::ErrorOr<BAN::RefPtr<Inode>> find_inode_impl(BAN::StringView) override;
virtual BAN::ErrorOr<size_t> list_next_inodes_impl(off_t, struct dirent*, size_t) override;
virtual BAN::ErrorOr<void> create_file_impl(BAN::StringView, mode_t, uid_t, gid_t) override { return BAN::Error::from_errno(EPERM); }
virtual BAN::ErrorOr<void> create_directory_impl(BAN::StringView, mode_t, uid_t, gid_t) override { return BAN::Error::from_errno(EPERM); }
virtual BAN::ErrorOr<void> link_inode_impl(BAN::StringView, BAN::RefPtr<Inode>) override { return BAN::Error::from_errno(EPERM); }
virtual BAN::ErrorOr<void> rename_inode_impl(BAN::RefPtr<Inode>, BAN::StringView, BAN::StringView) override { return BAN::Error::from_errno(EPERM); }
virtual BAN::ErrorOr<void> unlink_impl(BAN::StringView) override { return BAN::Error::from_errno(EPERM); }
virtual bool can_read_impl() const override { return false; }
virtual bool can_write_impl() const override { return false; }
virtual bool has_error_impl() const override { return false; }
virtual bool has_hungup_impl() const override { return false; }
private:
ProcFDDirectoryInode(Process&, TmpFileSystem&, const TmpInodeInfo&);
private:
Process& m_process;
};
}