Add a new gettytab(5) option - `pl', which if set tells getty that the line

in question is PPP-only line, i.e. no PPP-sequence detection is necessary and
PPP login program referenced by `pp' should be started automatically instead of
login(1)

Feature suggested and sponsored by:     United Networks of Ukraine
No reply from:  re
MFC after:	2 weeks

libexec/getty/gettytab.5

@@ -159,6 +159,8 @@ hangup line on last close
 .It "pf	num	0	delay"
 between first prompt and following flush (seconds)
 .It "pp	str	unused	PPP authentication program"
+.It "pl	bool	false	don't detect PPP sequence, but start PPP login"
+program referenced by pp automatically
 .It "ps	bool	false	line connected to a"
 .Tn MICOM
 port selector

libexec/getty/gettytab.h

@@ -173,4 +173,4 @@ struct gettyflags {
 #define	MB	gettyflags[22].value
 #define	HW	gettyflags[23].value
 #define	NC	gettyflags[24].value
-
+#define	PL	gettyflags[25].value

libexec/getty/init.c

@@ -149,5 +149,6 @@ struct	gettyflags gettyflags[] = {
 	{ "mb", 0 },			/* do MDMBUF flow control */
 	{ "hw", 0 },			/* do CTSRTS flow control */
 	{ "nc", 0 },			/* set clocal (no carrier) */
+	{ "pl", 0 },			/* use PPP instead of login(1) */
 	{ 0 }
 };

libexec/getty/main.c

@@ -332,7 +332,7 @@ main(int argc, char *argv[])
 		}
 		first_time = 0;
 
-		if (IM && *IM)
+		if (IM && *IM !(PL && PP))
 			putf(IM);
 		if (setjmp(timeout)) {
 			cfsetispeed(&tmode, B0);
@@ -357,9 +357,9 @@ main(int argc, char *argv[])
 					digit++;
 				*q++ = *p++;
 			}
-		} else
+		} else if (!(PL && PP))
 			rval = getname();
-		if (rval == 2) {
+		if (rval == 2 || (PL && PP)) {
 			oflush();
 			alarm(0);
 			limit.rlim_max = RLIM_INFINITY;