LibC: Write mostly functioning stdio

kernel/include/kernel/Process.h

@@ -43,6 +43,7 @@ namespace Kernel
 		BAN::ErrorOr<size_t> read(int, void*, size_t);
 		BAN::ErrorOr<size_t> write(int, const void*, size_t);
 		BAN::ErrorOr<void> creat(BAN::StringView, mode_t);
+		BAN::ErrorOr<void> seek(int, size_t);
 
 		BAN::ErrorOr<void> fstat(int, stat*);
 		BAN::ErrorOr<void> stat(BAN::StringView, stat*);
@@ -54,6 +55,8 @@ namespace Kernel
 		BAN::ErrorOr<BAN::String> working_directory() const;
 		BAN::ErrorOr<void> set_working_directory(BAN::StringView);
 
+		void termid(char*) const;
+
 		static Process& current() { return Thread::current().process(); }
 
 		MMU& mmu() { return m_mmu ? *m_mmu : MMU::get(); }

kernel/include/kernel/Syscall.h

@@ -3,6 +3,10 @@
 #define SYS_EXIT 1
 #define SYS_READ 2
 #define SYS_WRITE 3
+#define SYS_TERMID 4
+#define SYS_CLOSE 5
+#define SYS_SEEK 6
+#define SYS_OPEN 7
 
 #include <stdint.h>