kernel: implement _sys_time()

After some consideration this seems like the most fitting way to handle
timekeeping. Directly, the syscall is only useful for keeping time within a
single process, but it is meant to be used for e.g. NTP clients, which will
provide the real time through the VFS.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/kernel/proc.h b/src/kernel/proc.h
index bfe5cfc..5d95b52 100644
--- a/src/kernel/proc.h
+++ b/src/kernel/proc.h
@@ -98,6 +98,9 @@ struct Proc {
 		size_t len;
 		size_t pos;
 	} execbuf;
+
+	/* Time of the first _sys_time() call. 0 if not called yet. */
+	uint64_t basetime;
 };
 
 extern Proc *proc_cur;