On Tue, 26 Jan 2010 23:59:11 -0800
silverburgh <silverburgh.meryl@xxxxxxxxx> wrote:
> I have updated my gio_read_socket per your advice.
> But when the other end closes the socket (the GIOChannel* gio ties to
> that socket),
> I get a segmentation fault. I think some how when I call
> gio_shutdown, it ends up calling gio_read_socket again, and it crashes
> with a Segmentation fault.
>
> My console output:
> gio shutdown:
> gio_read_socket
>
> (GtkLauncher:5402): GLib-CRITICAL **: g_io_channel_read_line:
> assertion `channel->is_readable' failed
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x08048aa4 in gio_read_socket (gio=0x8590f50, condition=G_IO_IN,
> data=0x0) at main.c:230
> 230 g_error ("Error reading: %s\n",
> err->message);
>
>
> static gboolean
> gio_read_socket (GIOChannel *gio, GIOCondition condition, gpointer
> data) {
> printf (" gio_read_socket \n");
> GIOStatus ret;
> GError *err = NULL;
> gchar *msg;
> gsize len;
>
> if (condition & G_IO_HUP){
> printf ("Read end of pipe died!\n");
> return TRUE;
> }
>
> ret = g_io_channel_read_line (gio, &msg, &len, NULL, &err);
> if (ret == G_IO_STATUS_ERROR)
> g_error ("Error reading: %s\n", err->message);
> else if (ret == G_IO_STATUS_EOF) {
> printf ("gio shutdown: \n");
> g_io_channel_shutdown(gio, true, &err);
> } else {
> printf ("Read %u bytes: %s\n", len, msg);
> g_free (msg);
> }
>
> return TRUE;
> }
>
> Thank you for any more help.
You need to return FALSE in the callback if G_IO_HUP or G_IO_STATUS_EOF
is detected, since that will cause disconnection of the callback from
the glib main loop. If you have previously called g_io_channel_unref()
after the call to g_io_add_watch(), then this will also dispose of the
GIOChannel object, so don't try to access it again.
Chris
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