begin_op           86 defs.h         void            begin_op();
begin_op           21 exec.c           begin_op();
begin_op           75 file.c             begin_op();
begin_op          139 file.c               begin_op();
begin_op          189 proc.c           begin_op();
begin_op          124 sysfile.c        begin_op();
begin_op          192 sysfile.c        begin_op();
begin_op          294 sysfile.c        begin_op();
begin_op          339 sysfile.c        begin_op();
begin_op          357 sysfile.c        begin_op();
begin_op          376 sysfile.c        begin_op();