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Kernel: Add /proc/self

This commit is contained in:
Bananymous 2025-08-26 13:21:36 +03:00
parent b904503691
commit e4abe75043
3 changed files with 57 additions and 0 deletions
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26
kernel/include/kernel/FS/ProcFS/Inode.h
View File

@ -82,4 +82,30 @@ namespace Kernel
size_t (*m_callback)(off_t, BAN::ByteSpan);
};
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;
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&);
private:
BAN::ErrorOr<BAN::String> (*m_callback)(void*);
void* m_data;
};
}

8
kernel/kernel/FS/ProcFS/FileSystem.cpp
View File

@ -38,6 +38,14 @@ namespace Kernel
auto cmdline_inode = MUST(TmpFileInode::create_new(*s_instance, 0444, 0, 0));
MUST(cmdline_inode->write(0, { reinterpret_cast<const uint8_t*>(g_boot_info.command_line.data()), g_boot_info.command_line.size() }));
MUST(static_cast<TmpDirectoryInode*>(s_instance->root_inode().ptr())->link_inode(*cmdline_inode, "cmdline"_sv));
auto self_inode = MUST(ProcSymlinkInode::create_new(
[](void*) -> BAN::ErrorOr<BAN::String> {
return BAN::String::formatted("{}", Process::current().pid());
},
nullptr, *s_instance, 0444, 0, 0)
);
MUST(static_cast<TmpDirectoryInode*>(s_instance->root_inode().ptr())->link_inode(*self_inode, "self"_sv));
}
ProcFileSystem& ProcFileSystem::get()

23
kernel/kernel/FS/ProcFS/Inode.cpp
View File

@ -83,4 +83,27 @@ namespace Kernel
return m_callback(offset, buffer);
}
BAN::ErrorOr<BAN::RefPtr<ProcSymlinkInode>> ProcSymlinkInode::create_new(BAN::ErrorOr<BAN::String> (*callback)(void*), void* data, TmpFileSystem& fs, mode_t mode, uid_t uid, gid_t gid)
{
auto inode_info = create_inode_info(Mode::IFLNK | mode, uid, gid);
auto* inode_ptr = new ProcSymlinkInode(callback, data, fs, inode_info);
if (inode_ptr == nullptr)
return BAN::Error::from_errno(ENOMEM);
return BAN::RefPtr<ProcSymlinkInode>::adopt(inode_ptr);
}
ProcSymlinkInode::ProcSymlinkInode(BAN::ErrorOr<BAN::String> (*callback)(void*), void* data, TmpFileSystem& fs, const TmpInodeInfo& inode_info)
: TmpInode(fs, MUST(fs.allocate_inode(inode_info)), inode_info)
, m_callback(callback)
, m_data(data)
{
m_inode_info.mode |= Inode::Mode::IFLNK;
}
BAN::ErrorOr<BAN::String> ProcSymlinkInode::link_target_impl()
{
return m_callback(m_data);
}
}