Aucbvax.2692
fa.unix-wizards
utzoo!decvax!ucbvax!unix-wizards
Fri Aug 14 14:38:23 1981
Re: Bug (?) in tty
>From Greg@NPRDC Fri Aug 14 14:35:53 1981
I have encountered the same problem. My fix was to check the ISOPEN bit
in the tty struct to see if it was busy, but to permit a child of init
to force ownership. If there is a prior claim, it tries to do away with
it. The code from tty$ttyopen is reproduced below. Zapping the tty struct
in exit may not be sufficient if there are background jobs still running.
pp = u.u_procp;
tp = atp;
if(pp->p_pgrp == 0) {
pp->p_pgrp = pp->p_pid;
u.u_ttyp = tp;
u.u_ttyd = dev;
if((tp->t_state&ISOPEN) == 0 || pp->p_ppid == 1) {
if(tp->t_pgrp) {
signal(tp->t_pgrp, SIGHUP);
flushtty(tp);
}
tp->t_pgrp = pp->p_pid;
tp->t_col = -1;
}
}
tp->t_state =& ~WOPEN;
tp->t_state =| ISOPEN;
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