Monitoring IO

[Chris Blazie <chris blazie com>]

Hello,

        I'm working on some applications that need to monitor and interact
with arbitrary external IO (for now, the serial port).  For starters
(since I'm new to GTK development), I wrote a tiny app that instantiates a
GtkText widget, registers a GIO Channel via the gtk_input_add_full()
wrapper, and writes to the GtkText box from the input callback:

s_port = fopen( "/dev/ttyS0", "r" );

off = gtk_input_add_full( (gint) s_port, GDK_INPUT_READ,
                                (GdkInputFunction) input_callback,
                                NULL, data, NULL );


The input_callback function looks like this:

void input_callback( gpointer          data, gint              source, 
                     GdkInputCondition condition )
{
        gtk_text_insert( GTK_TEXT(textedit), NULL, NULL, NULL, "data
added\n", -1 );

}

        For some reason the input_callback function never gets called.
I suspect I'm not using the FILE pointer correctly, but I don't know how.
Can someone tell me what I'm missing here?

Thanks,
Chris