#include "header.h"
extern pid_t pid_sop;
extern int signal_pipe[2];
extern pid_t pid_channel;
extern pid_t pid_player;
extern GtkWidget *button_channel;
extern GtkWidget *label_player;
//-----------------------------------------------------
////handle signal child
void pipe_signals(int signal)
{
    if (write(signal_pipe[1], &signal, sizeof(int)) != sizeof(int)) {
	fprintf(stderr, "unix signal %d lost\n", signal);
    }
}


//-----------------------------------------------------
void processSignal(int result, int status)
{
    if (result == pid_sop)	//if the value of pid_sop has been updated first, this condition won't be met.
    {
	pid_sop = -2;		/////reset to default value
	/////////////display quit message
//      gtk_entry_set_text (GTK_ENTRY (entry_status), "");
    } else if (result == pid_channel) {
	pid_channel = -2;	/////reset to default value      
	gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON
				     (button_channel), FALSE);
    } else if (result == pid_player) {
	GdkColor color;
	gdk_color_parse("black", &color);
	gtk_widget_modify_fg(label_player, GTK_STATE_NORMAL, &color);
	pid_player = -2;
    }
}

//-----------------------------------------------------
gboolean handle_io_pipe(GIOChannel * source, GIOCondition cond, gpointer d)
{
    GError *error = NULL;	/* for error handling */
    char buf[64];
    GIOStatus status;		/* save the reading status */
    gsize bytes_read;		/* save the number of chars read */
    int waitstat;
    int waitresult;

    if ((status =
	 g_io_channel_read_chars(source, buf, sizeof(buf), &bytes_read,
				 &error)) == G_IO_STATUS_NORMAL
	&& bytes_read > 0) {
	/////////////
	while (1) {
	    if ((waitresult =
		 waitpid(WAIT_ANY, &waitstat, WNOHANG | WUNTRACED)) <= 0)
		break;
	    processSignal(waitresult, waitstat);
	}
	/////////////
    }
    return (TRUE);		/* keep the event source */
}