begin_op           87 defs.h         void            begin_op();
begin_op           22 exec.c           begin_op();
begin_op           76 file.c             begin_op();
begin_op          140 file.c               begin_op();
begin_op          245 proc.c           begin_op();
begin_op          127 sysfile.c        begin_op();
begin_op          195 sysfile.c        begin_op();
begin_op          296 sysfile.c        begin_op();
begin_op          341 sysfile.c        begin_op();
begin_op          358 sysfile.c        begin_op();
begin_op          378 sysfile.c        begin_op();