From e2ad7a18f99d403ab9c7a8984272b6c098cec960 Mon Sep 17 00:00:00 2001
From: Chris Michael <cp.michael@samsung.com>
Date: Tue, 8 Jul 2014 12:05:13 -0400
Subject: [PATCH] Revert "evas/drm: Remove obsolete tty open function"

This reverts commit 1db13194a23e8ed0afa01474031cc8e2d4fc4049.

Revert this commit as this is needed to run the evas engine in
standalone situations like expedite.
---
 src/modules/evas/engines/drm/evas_drm.c | 85 +++++++++++++++++++++++++
 1 file changed, 85 insertions(+)

diff --git a/src/modules/evas/engines/drm/evas_drm.c b/src/modules/evas/engines/drm/evas_drm.c
index d26874f57d..e5bd74d1be 100644
--- a/src/modules/evas/engines/drm/evas_drm.c
+++ b/src/modules/evas/engines/drm/evas_drm.c
@@ -8,6 +8,63 @@
  * pass any 'user data' to the signal handlers :( */
 static Evas_Engine_Info_Drm *siginfo;
 
+static int 
+_evas_drm_tty_open(Evas_Engine_Info_Drm *info)
+{
+   int tty = STDIN_FILENO;
+
+   /* check if the current stdin is a valid tty */
+   if (!isatty(tty))
+     {
+        /* if not, try to open the curren tty */
+        if ((tty = open("/dev/tty", (O_RDWR | O_CLOEXEC))) < 0)
+          {
+             int tty0 = -1, num = -1;
+             char name[16];
+
+             /* if that fails, try tty0 */
+             if ((tty0 = open("/dev/tty0", (O_WRONLY | O_CLOEXEC))) < 0)
+               {
+                  CRI("Could not open tty0: %m");
+                  return -1;
+               }
+
+             /* try to find a non-opened tty */
+             if ((ioctl(tty0, VT_OPENQRY, &num) < 0) || (num < 0))
+               {
+                  CRI("Could not find a non-opened tty");
+                  close(tty0);
+                  return -1;
+               }
+
+             snprintf(name, sizeof(name), "/dev/tty%d", num);
+
+             /* try to open this tty */
+             if ((tty = open(name, (O_RDWR | O_CLOEXEC))) < 0)
+               {
+                  CRI("Could not open tty: %s", name);
+                  close(tty0);
+                  return -1;
+               }
+
+             /* set flag that evas should close this tty */
+             info->info.own_tty = EINA_TRUE;
+
+             /* close /dev/tty0 */
+             close(tty0);
+          }
+     }
+   else
+     {
+        /* set flag that evas should close this tty */
+        info->info.own_tty = EINA_TRUE;
+     }
+
+   DBG("Opened Tty %d", tty);
+
+   return tty;
+}
+
 static int 
 _evas_drm_crtc_find(int fd, drmModeRes *res, drmModeConnector *conn)
 {
@@ -260,9 +317,30 @@ evas_drm_init(Evas_Engine_Info_Drm *info)
 
    setvbuf(stdout, NULL, _IONBF, 0);
 
+   /* check if we already opened the tty */
+   if (info->info.tty < 0)
+     {
+        /* try to open the current tty */
+        if ((info->info.tty = _evas_drm_tty_open(info)) < 0) 
+          {
+             /* check if we already opened the card. if so, close it */
+             if ((info->info.fd >= 0) && (info->info.own_fd))
+               {
+                  close(info->info.fd);
+                  info->info.fd = -1;
+               }
+
+             return EINA_FALSE;
+          }
+     }
+
    /* with the tty opened, we need to set it up */
    if (!_evas_drm_tty_setup(info))
      {
+        /* setup of tty failed, close it */
+        if ((info->info.tty >= 0) && (info->info.own_tty))
+          close(info->info.tty);
+
         return EINA_FALSE;
      }
 
@@ -275,6 +353,13 @@ evas_drm_shutdown(Evas_Engine_Info_Drm *info)
    /* check for valid engine info */
    if (!info) return EINA_TRUE;
 
+   /* check if we already opened the tty. if so, close it */
+   if ((info->info.tty >= 0) && (info->info.own_tty))
+     {
+        close(info->info.tty);
+        info->info.tty = -1;
+     }
+
    return EINA_TRUE;
 }