From ff91c696ff8f5f56da40e107cb5c321539758a81 Mon Sep 17 00:00:00 2001

From: Michal Srb <msrb@suse.com>

Date: Tue, 16 Oct 2018 09:32:13 +0200

Subject: [PATCH xserver] xfree86: Only switch to original VT if it is active.

If the X server is terminated while its VT is not active, it should

not change the current VT.

v2: Query current state in xf86CloseConsole using VT_GETSTATE instead of

    keeping track in xf86VTEnter/xf86VTLeave/etc.

---

 hw/xfree86/os-support/linux/lnx_init.c | 16 +++++++++++++---

 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/hw/xfree86/os-support/linux/lnx_init.c b/hw/xfree86/os-support/linux/lnx_init.c

index 039dc4a4d..358d89f0f 100644

--- a/hw/xfree86/os-support/linux/lnx_init.c

+++ b/hw/xfree86/os-support/linux/lnx_init.c

@@ -272,101 +272,111 @@ xf86OpenConsole(void)

                 xf86SetConsoleHandler(drain_console, NULL);

             }

             nTty = tty_attr;

             nTty.c_iflag = (IGNPAR | IGNBRK) & (~PARMRK) & (~ISTRIP);

             nTty.c_oflag = 0;

             nTty.c_cflag = CREAD | CS8;

             nTty.c_lflag = 0;

             nTty.c_cc[VTIME] = 0;

             nTty.c_cc[VMIN] = 1;

             cfsetispeed(&nTty, 9600);

             cfsetospeed(&nTty, 9600);

             tcsetattr(xf86Info.consoleFd, TCSANOW, &nTty);

         }

     }

     else {                      /* serverGeneration != 1 */

         if (!xf86Info.ShareVTs && xf86Info.autoVTSwitch) {

             /* now get the VT */

             if (!switch_to(xf86Info.vtno, "xf86OpenConsole"))

                 FatalError("xf86OpenConsole: Switching VT failed\n");

         }

     }

 }

 #pragma GCC diagnostic pop

 void

 xf86CloseConsole(void)

 {

     struct vt_mode VT;

+    struct vt_stat vts;

     int ret;

     if (xf86Info.ShareVTs) {

         close(xf86Info.consoleFd);

         return;

     }

     /*

      * unregister the drain_console handler

      * - what to do if someone else changed it in the meantime?

      */

     xf86SetConsoleHandler(NULL, NULL);

     /* Back to text mode ... */

     SYSCALL(ret = ioctl(xf86Info.consoleFd, KDSETMODE, KD_TEXT));

     if (ret < 0)

         xf86Msg(X_WARNING, "xf86CloseConsole: KDSETMODE failed: %s\n",

                 strerror(errno));

     SYSCALL(ioctl(xf86Info.consoleFd, KDSKBMODE, tty_mode));

     tcsetattr(xf86Info.consoleFd, TCSANOW, &tty_attr);

     SYSCALL(ret = ioctl(xf86Info.consoleFd, VT_GETMODE, &VT));

     if (ret < 0)

         xf86Msg(X_WARNING, "xf86CloseConsole: VT_GETMODE failed: %s\n",

                 strerror(errno));

     else {

         /* set dflt vt handling */

         VT.mode = VT_AUTO;

         SYSCALL(ret = ioctl(xf86Info.consoleFd, VT_SETMODE, &VT));

         if (ret < 0)

             xf86Msg(X_WARNING, "xf86CloseConsole: VT_SETMODE failed: %s\n",

                     strerror(errno));

     }

     if (xf86Info.autoVTSwitch) {

         /*

-         * Perform a switch back to the active VT when we were started

-         */

+        * Perform a switch back to the active VT when we were started if our

+        * vt is active now.

+        */

         if (activeVT >= 0) {

-            switch_to(activeVT, "xf86CloseConsole");

+            SYSCALL(ret = ioctl(xf86Info.consoleFd, VT_GETSTATE, &vts));

+            if (ret < 0) {

+                xf86Msg(X_WARNING, "xf86OpenConsole: VT_GETSTATE failed: %s\n",

+                        strerror(errno));

+            } else {

+                if (vts.v_active == xf86Info.vtno) {

+                    switch_to(activeVT, "xf86CloseConsole");

+                }

+            }

             activeVT = -1;

         }

     }

     close(xf86Info.consoleFd);  /* make the vt-manager happy */

 }

 #define CHECK_FOR_REQUIRED_ARGUMENT() \

     if (((i + 1) >= argc) || (!argv[i + 1])) { 				\

       ErrorF("Required argument to %s not specified\n", argv[i]); 	\

       UseMsg(); 							\

       FatalError("Required argument to %s not specified\n", argv[i]);	\

     }

 int

 xf86ProcessArgument(int argc, char *argv[], int i)

 {

     /*

      * Keep server from detaching from controlling tty.  This is useful

      * when debugging (so the server can receive keyboard signals.

      */

     if (!strcmp(argv[i], "-keeptty")) {

         KeepTty = TRUE;

         return 1;

     }

     if ((argv[i][0] == 'v') && (argv[i][1] == 't')) {

         if (sscanf(argv[i], "vt%2d", &xf86Info.vtno) == 0) {

             UseMsg();

             xf86Info.vtno = -1;

             return 0;

-- 

2.21.0