old_sid           418 src/subshell/common.c     pid_t my_sid, old_sid;
old_sid           426 src/subshell/common.c     old_sid = (pid_t) strtol (sid_str, NULL, 0);
old_sid           427 src/subshell/common.c     if (old_sid == 0)
old_sid           435 src/subshell/common.c     if (old_sid != my_sid)