From 391516dd77b24e27b1d71b0c911586663b014671 Mon Sep 17 00:00:00 2001
From: David van Moolenbroek <david@minix3.org>
Date: Mon, 25 Aug 2014 19:34:39 +0000
Subject: [PATCH] tty/pty: unbreak stty(1)

Change-Id: I3f857dcbb89e18c7db3a72f4bd6809beb7904bc0
---
 minix/drivers/tty/pty/pty.c |  3 ++-
 minix/drivers/tty/pty/tty.c | 22 ++++++++++++++++------
 minix/drivers/tty/pty/tty.h |  1 +
 minix/drivers/tty/tty/tty.c | 16 +++++++++++-----
 4 files changed, 30 insertions(+), 12 deletions(-)

diff --git a/minix/drivers/tty/pty/pty.c b/minix/drivers/tty/pty/pty.c
index 772aa5b09..6fc49bc30 100644
--- a/minix/drivers/tty/pty/pty.c
+++ b/minix/drivers/tty/pty/pty.c
@@ -45,7 +45,8 @@ typedef struct pty {
   /* Output buffer. */
   int		ocount;		/* # characters in the buffer */
   char		*ohead, *otail;	/* head and tail of the circular buffer */
-  char		obuf[2048];	/* buffer for bytes going to the pty reader */
+  char		obuf[TTY_OUT_BYTES];
+				/* buffer for bytes going to the pty reader */
 
   /* select() data. */
   unsigned int	select_ops;	/* Which operations do we want to know about? */
diff --git a/minix/drivers/tty/pty/tty.c b/minix/drivers/tty/pty/tty.c
index 48bb90068..1f71a17d5 100644
--- a/minix/drivers/tty/pty/tty.c
+++ b/minix/drivers/tty/pty/tty.c
@@ -84,6 +84,8 @@ static struct termios termios_defaults = {
 };
 static struct winsize winsize_defaults;	/* = all zeroes */
 
+static const char lined[TTLINEDNAMELEN] = "termios";	/* line discipline */
+
 /* Global variables for the TTY task (declared extern in tty.h). */
 tty_t tty_table[NR_PTYS];
 u32_t system_hz;
@@ -391,17 +393,25 @@ static int do_ioctl(devminor_t minor, unsigned long request, endpoint_t endpt,
 	sigchar(tp, SIGWINCH, 0);
 	break;
     case TIOCGETD:	/* get line discipline */
-    {
-	int disc = TTYDISC;
-	r = sys_safecopyto(endpt, grant, 0,
-		(vir_bytes) &disc, (vir_bytes) sizeof(disc));
+	i = TTYDISC;
+	r = sys_safecopyto(endpt, grant, 0, (vir_bytes) &i, sizeof(i));
 	break;
-    }
     case TIOCSETD:	/* set line discipline */
 	printf("TTY: TIOCSETD: can't set any other line discipline.\n");
 	r = ENOTTY;
 	break;
-
+    case TIOCGLINED:	/* get line discipline as string */
+	r = sys_safecopyto(endpt, grant, 0, (vir_bytes) lined, sizeof(lined));
+	break;
+    case TIOCGQSIZE:	/* get input/output queue sizes */
+	/* Not sure what to report here. We are using input and output queues
+	 * of different sizes, and the IOCTL allows for one single value for
+	 * both. So far this seems to be just for stty(1) so let's just report
+	 * the larger of the two. TODO: revisit queue sizes altogether.
+	 */
+	i = MAX(TTY_IN_BYTES, TTY_OUT_BYTES);
+	r = sys_safecopyto(endpt, grant, 0, (vir_bytes) &i, sizeof(i));
+	break;
     case TIOCSCTTY:
 	/* Process sets this tty as its controlling tty */
 	tp->tty_pgrp = user_endpt;
diff --git a/minix/drivers/tty/pty/tty.h b/minix/drivers/tty/pty/tty.h
index 7fae103ee..8d353cfec 100644
--- a/minix/drivers/tty/pty/tty.h
+++ b/minix/drivers/tty/pty/tty.h
@@ -8,6 +8,7 @@
 #define PTYPX_MINOR	 192
 
 #define TTY_IN_BYTES     256	/* tty input queue size */
+#define TTY_OUT_BYTES   2048	/* tty output queue size */
 #define TAB_SIZE           8	/* distance between tab stops */
 #define TAB_MASK           7	/* mask to compute a tab stop position */
 
diff --git a/minix/drivers/tty/tty/tty.c b/minix/drivers/tty/tty/tty.c
index 51519cc46..841035acd 100644
--- a/minix/drivers/tty/tty/tty.c
+++ b/minix/drivers/tty/tty/tty.c
@@ -133,6 +133,8 @@ u32_t system_hz;
 u32_t consoleline = CONS_MINOR;
 u32_t kernel_msg_color = 0;
 
+static const char lined[TTLINEDNAMELEN] = "termios";	/* line discipline */
+
 /* SEF functions and variables. */
 static void sef_local_startup(void);
 static int sef_cb_init_fresh(int type, sef_init_info_t *info);
@@ -677,16 +679,20 @@ static int do_ioctl(devminor_t minor, unsigned long request, endpoint_t endpt,
 	beep_x(bell.kb_pitch, ticks);
 	break;
     case TIOCGETD:	/* get line discipline */
-    {
-	int disc = TTYDISC;
-	r = sys_safecopyto(endpt, grant, 0,
-		(vir_bytes) &disc, (vir_bytes) sizeof(disc));
+	i = TTYDISC;
+	r = sys_safecopyto(endpt, grant, 0, (vir_bytes) &i, sizeof(i));
 	break;
-    }
     case TIOCSETD:	/* set line discipline */
 	printf("TTY: TIOCSETD: can't set any other line discipline.\n");
 	r = ENOTTY;
 	break;
+    case TIOCGLINED:	/* get line discipline as string */
+	r = sys_safecopyto(endpt, grant, 0, (vir_bytes) lined, sizeof(lined));
+	break;
+    case TIOCGQSIZE:	/* get input/output queue sizes */
+	i = TTY_IN_BYTES;	/* best we can do.. */
+	r = sys_safecopyto(endpt, grant, 0, (vir_bytes) &i, sizeof(i));
+	break;
     case KIOCSMAP:
 	/* Load a new keymap (only /dev/console). */
 	if (isconsole(tp)) r = kbd_loadmap(endpt, grant);