* Paul Mackerras (paulus@cs.anu.edu.au).
*/
-/* $Id: ppp_tty.c,v 1.1 1994/12/15 22:28:09 paulus Exp $ */
+/* $Id: ppp_tty.c,v 1.2 1995/05/02 01:00:44 paulus Exp $ */
/* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */
#include "ppp.h"
register int s;
int error = 0;
- if ((tp->t_state & TS_CARR_ON) == 0 && (tp->t_cflag & CLOCAL) == 0)
- return 0; /* end of file */
- if (sc == NULL || tp != (struct tty *) sc->sc_devp)
+ if (sc == NULL)
return 0;
+ /*
+ * Loop waiting for input, checking that nothing disasterous
+ * happens in the meantime.
+ */
s = splimp();
- while (sc->sc_inq.ifq_head == NULL && tp->t_line == PPPDISC) {
+ for (;;) {
+ if (tp != (struct tty *) sc->sc_devp || tp->t_line != PPPDISC) {
+ splx(s);
+ return 0;
+ }
+ if (sc->sc_inq.ifq_head != NULL)
+ break;
+ if ((tp->t_state & TS_CARR_ON) == 0 && (tp->t_cflag & CLOCAL) == 0
+ && (tp->t_state & TS_ISOPEN)) {
+ splx(s);
+ return 0; /* end of file */
+ }
if (tp->t_state & TS_ASYNC || flag & IO_NDELAY) {
splx(s);
return (EWOULDBLOCK);
return error;
}
}
- if (tp->t_line != PPPDISC) {
- splx(s);
- return (-1);
- }
/* Pull place-holder byte out of canonical queue */
getc(&tp->t_canq);