Re: [Qemu-devel] [PATCH] terminal attributes is not restored when using /dev/tty monitor

[Shahar Havivi <shaharh@redhat.com>]

On Sat, Feb 20, 2010 at 11:03:41AM -0600, Anthony Liguori wrote:
> Date: Sat, 20 Feb 2010 11:03:41 -0600
> From: Anthony Liguori <anthony@codemonkey.ws>
> To: "David S. Ahern" <daahern@cisco.com>
> Cc: Dor Laor <dlaor@redhat.com>, Shahar Havivi <shaharh@redhat.com>,
> 	qemu-devel@nongnu.org
> Subject: Re: [Qemu-devel] [PATCH] terminal attributes is not restored when
> 	using /dev/tty monitor
> 
> On 02/20/2010 09:18 AM, David S. Ahern wrote:
> >On 02/20/2010 01:30 AM, Shahar Havivi wrote:
> >>when exiting qemu that run with "-monitor /dev/tty", the launching
> >>terminal get weird behaviour because no restore terminals action has
> >>taken.
> >>added chr_close and register atexit() code for tty devices (like stdio
> >>does)
> >>
> >>Signed-off-by: Shahar Havivi<shaharh@redhat.com>
> >>---
> >>  qemu-char.c |   14 ++++++++++++++
> >>  1 files changed, 14 insertions(+), 0 deletions(-)
> >>
> >>diff --git a/qemu-char.c b/qemu-char.c
> >>index 75dbf66..de16883 100644
> >>--- a/qemu-char.c
> >>+++ b/qemu-char.c
> >>@@ -1002,6 +1002,7 @@ static void tty_serial_init(int fd, int speed,
> >>             speed, parity, data_bits, stop_bits);
> >>  #endif
> >>      tcgetattr (fd,&tty);
> >>+    oldtty = tty;
> >>
> >>  #define check_speed(val) if (speed<= val) { spd = B##val; break; }
> >>      speed = speed * 10 / 11;
> >>@@ -1173,6 +1174,17 @@ static int tty_serial_ioctl(CharDriverState *chr, int cmd, void *arg)
> >>      return 0;
> >>  }
> >>
> >>+static void tty_exit(void)
> >>+{
> >>+    tcsetattr(0, TCSANOW,&oldtty);
> >>+}
> >>+
> >>+static void qemu_chr_close_tty(struct CharDriverState *chr)
> >>+{
> >>+    tty_exit();
> >>+    fd_chr_close(chr);
> >>+}
> >
> >The close callback needs to close the fd for the device as well. I have
> >sent a patch to handle this; waiting for it to be included:
> >
> >http://permalink.gmane.org/gmane.comp.emulators.qemu/63472
> 
> It didn't apply with git-am.  I'm not sure why, am investigating now.
> 
> Regards,
> 
> Anthony Liguori
> 
Note that the method fd_chr_close() is closing the fd_in, no need to the
close logic again, and when opening a monitor with /dev/tty the
chr->chr_close not called that is why you need to register with
atexit(). (same as stdio monitor does).
Shahar.
> >David
> >
> >
> >>+
> >>  static CharDriverState *qemu_chr_open_tty(QemuOpts *opts)
> >>  {
> >>      const char *filename = qemu_opt_get(opts, "path");
> >>@@ -1190,6 +1202,8 @@ static CharDriverState *qemu_chr_open_tty(QemuOpts *opts)
> >>          return NULL;
> >>      }
> >>      chr->chr_ioctl = tty_serial_ioctl;
> >>+    chr->chr_close = qemu_chr_close_tty;
> >>+    atexit(tty_exit);
> >>      return chr;
> >>  }
> >>  #else  /* ! __linux__&&  ! __sun__ */
> >
> >
> 
> 
>