From 482a38725d4e1d9b5aee18e2b2d5af3d0b0e54e9 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Sun, 19 May 2024 19:10:35 -0400
Subject: kernel: tty: Implement tty_ioctl()

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/include/sys/tty.h |  4 ++++
 sys/kern/kern_tty.c   | 22 ++++++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/sys/include/sys/tty.h b/sys/include/sys/tty.h
index a4595d5..18583a5 100644
--- a/sys/include/sys/tty.h
+++ b/sys/include/sys/tty.h
@@ -38,6 +38,10 @@
 #include <dev/vcons/vcons.h>
 #endif
 
+/* TTY ioctl commands */
+#define TCSETS 0x00000000U
+#define TCGETS 0x00000001U
+
 #if defined(_KERNEL)
 #define TTY_RING_SIZE 32
 #define TTY_SOURCE_RAW 0x0001U   /* Raw text */
diff --git a/sys/kern/kern_tty.c b/sys/kern/kern_tty.c
index cb3e30a..5c060a4 100644
--- a/sys/kern/kern_tty.c
+++ b/sys/kern/kern_tty.c
@@ -28,6 +28,7 @@
  */
 
 #include <sys/tty.h>
+#include <sys/system.h>
 #include <sys/cdefs.h>
 #include <sys/errno.h>
 #include <sys/syslog.h>
@@ -153,6 +154,26 @@ tty_dev_read(struct device *dev, struct sio_txn *sio)
     return len;
 }
 
+static int
+tty_ioctl(struct device *dev, uint32_t cmd, uintptr_t arg)
+{
+    /* TODO: Support multiple TTYs */
+    struct termios *tp = &g_root_tty.termios;
+
+    switch (cmd) {
+    case TCGETS:
+        copyout(tp, arg, sizeof(struct termios));
+        break;
+    case TCSETS:
+        copyin(arg, tp, sizeof(struct termios));
+        break;
+    default:
+        return -EINVAL;
+    }
+
+    return 0;
+}
+
 /*
  * Serialized wrapper over __tty_flush()
  */
@@ -264,6 +285,7 @@ tty_attach(struct tty *tty)
         return tmp;
 
     dev->read = tty_dev_read;
+    dev->ioctl = tty_ioctl;
     dev->blocksize = 1;
 
     snprintf(devname, sizeof(devname), "tty%d", tty->id);
-- 
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