Kernel: /proc/{pid}/meminfo now reports per process memory usage

kernel/include/kernel/FS/ProcFS/Inode.h

@@ -20,4 +20,25 @@ namespace Kernel
 		Process& m_process;
 	};
 
+	class ProcMemInode final : public RamInode
+	{
+	public:
+		static BAN::ErrorOr<BAN::RefPtr<ProcMemInode>> create(Process&, RamFileSystem&, mode_t, uid_t, gid_t);
+		~ProcMemInode() = default;
+
+	protected:
+		virtual BAN::ErrorOr<size_t> read_impl(off_t, void*, size_t) override;
+
+		// You may not write here and this is always non blocking
+		virtual BAN::ErrorOr<size_t> write_impl(off_t, const void*, size_t)	override	{ return BAN::Error::from_errno(EINVAL); }
+		virtual BAN::ErrorOr<void> truncate_impl(size_t) override						{ return BAN::Error::from_errno(EINVAL); }
+		virtual bool has_data_impl() const override										{ return true; }
+
+	private:
+		ProcMemInode(Process&, RamFileSystem&, const FullInodeInfo&);
+	
+	private:
+		Process& m_process;
+	};
+
 }

kernel/include/kernel/Process.h

@@ -13,6 +13,7 @@
 #include <kernel/Terminal/TTY.h>
 #include <kernel/Thread.h>
 
+#include <sys/banan-os.h>
 #include <sys/mman.h>
 #include <termios.h>
 
@@ -138,6 +139,8 @@ namespace Kernel
 
 		PageTable& page_table() { return m_page_table ? *m_page_table : PageTable::kernel(); }
 
+		void get_meminfo(proc_meminfo_t*) const;
+
 		bool is_userspace() const { return m_is_userspace; }
 		const userspace_info_t& userspace_info() const { return m_userspace_info; }