Re: [Qemu-devel] [PULL 7/8] gtk: Fix -serial vc

[Jan Kiszka <jan.kiszka@web.de>]

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On 2014-04-29 11:46, Gerd Hoffmann wrote:
> From: Cole Robinson <crobinso@redhat.com>
> 
> Try kicking off a rhel5 text install over serial, the text menu navigation
> is all messed up, and some of the kernel boot messages are randomly
> corrupted.
> 
> Drop use of a pty and just use vte infrastructure for reading and writing.
> This fixes the above corruption, and is simpler to boot.
> 
> (I don't know what was wrong with the original code though. FWIW this is
> what virt-manager has done for years).
> 
> Signed-off-by: Cole Robinson <crobinso@redhat.com>
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
>  ui/gtk.c | 41 +++++++++--------------------------------
>  1 file changed, 9 insertions(+), 32 deletions(-)
> 
> diff --git a/ui/gtk.c b/ui/gtk.c
> index c85aea3..1465a38 100644
> --- a/ui/gtk.c
> +++ b/ui/gtk.c
> @@ -115,7 +115,6 @@ typedef struct VirtualConsole
>      GtkWidget *scrolled_window;
>      CharDriverState *chr;
>  #endif
> -    int fd;
>  } VirtualConsole;
>  
>  typedef struct GtkDisplayState
> @@ -1162,9 +1161,12 @@ static gboolean gd_focus_out_event(GtkWidget *widget,
>  
>  static int gd_vc_chr_write(CharDriverState *chr, const uint8_t *buf, int len)
>  {
> +#if defined(CONFIG_VTE)
>      VirtualConsole *vc = chr->opaque;
>  
> -    return vc ? write(vc->fd, buf, len) : len;
> +    vte_terminal_feed(VTE_TERMINAL(vc->terminal), (const char *)buf, len);
> +#endif
> +    return len;
>  }
>  
>  static int nb_vcs;
> @@ -1190,19 +1192,12 @@ void early_gtk_display_init(void)
>  }
>  
>  #if defined(CONFIG_VTE)
> -static gboolean gd_vc_in(GIOChannel *chan, GIOCondition cond, void *opaque)
> +static gboolean gd_vc_in(VteTerminal *terminal, gchar *text, guint size,
> +                         gpointer user_data)
>  {
> -    VirtualConsole *vc = opaque;
> -    uint8_t buffer[1024];
> -    ssize_t len;
> -
> -    len = read(vc->fd, buffer, sizeof(buffer));
> -    if (len <= 0) {
> -        return FALSE;
> -    }
> -
> -    qemu_chr_be_write(vc->chr, buffer, len);
> +    VirtualConsole *vc = user_data;
>  
> +    qemu_chr_be_write(vc->chr, (uint8_t  *)text, (unsigned int)size);
>      return TRUE;
>  }
>  #endif
> @@ -1214,13 +1209,8 @@ static GSList *gd_vc_init(GtkDisplayState *s, VirtualConsole *vc, int index, GSL
>      const char *label;
>      char buffer[32];
>      char path[32];
> -#if VTE_CHECK_VERSION(0, 26, 0)
> -    VtePty *pty;
> -#endif
> -    GIOChannel *chan;
>      GtkWidget *scrolled_window;
>      GtkAdjustment *vadjustment;
> -    int master_fd, slave_fd;
>  
>      snprintf(buffer, sizeof(buffer), "vc%d", index);
>      snprintf(path, sizeof(path), "<QEMU>/View/VC%d", index);
> @@ -1239,16 +1229,7 @@ static GSList *gd_vc_init(GtkDisplayState *s, VirtualConsole *vc, int index, GSL
>      gtk_accel_map_add_entry(path, GDK_KEY_2 + index, HOTKEY_MODIFIERS);
>  
>      vc->terminal = vte_terminal_new();
> -
> -    master_fd = qemu_openpty_raw(&slave_fd, NULL);
> -    g_assert(master_fd != -1);
> -
> -#if VTE_CHECK_VERSION(0, 26, 0)
> -    pty = vte_pty_new_foreign(master_fd, NULL);
> -    vte_terminal_set_pty_object(VTE_TERMINAL(vc->terminal), pty);
> -#else
> -    vte_terminal_set_pty(VTE_TERMINAL(vc->terminal), master_fd);
> -#endif
> +    g_signal_connect(vc->terminal, "commit", G_CALLBACK(gd_vc_in), vc);
>  
>      vte_terminal_set_scrollback_lines(VTE_TERMINAL(vc->terminal), -1);
>  
> @@ -1263,7 +1244,6 @@ static GSList *gd_vc_init(GtkDisplayState *s, VirtualConsole *vc, int index, GSL
>  
>      vte_terminal_set_size(VTE_TERMINAL(vc->terminal), 80, 25);
>  
> -    vc->fd = slave_fd;
>      vc->chr->opaque = vc;
>      vc->scrolled_window = scrolled_window;
>  
> @@ -1281,9 +1261,6 @@ static GSList *gd_vc_init(GtkDisplayState *s, VirtualConsole *vc, int index, GSL
>          vc->chr->init(vc->chr);
>      }
>  
> -    chan = g_io_channel_unix_new(vc->fd);
> -    g_io_add_watch(chan, G_IO_IN, gd_vc_in, vc);
> -
>  #endif /* CONFIG_VTE */
>      return group;
>  }
> 

This commit somehow messes up the monitor vc: Fire up qemu-system-x86_64
and switch to console 2 (monitor). You'll find it formatted as if the
console was only ~10 chars wide during printout of the monitor
greetings. When typing, everything is fine again. Maybe an ordering
issue that was only revealed by this commit, dunno yet.

Jan


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