Hello,
I am trying to use GIOChannel in order to use sockets in a simple way (I
am trying to get notification on events like read and disconnect).
Anyway, here is the code that creates the GIOCHannel
void
on_ListenButton_clicked (GtkButton *button,
gpointer user_data)
{
GtkWidget *text = lookup_widget(GTK_WIDGET(button),
"StatusText");
// create the listening socket
int sockfd, new_fd;
struct sockaddr_in my_addr;
struct sockaddr_in their_addr;
int sin_size;
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
perror("socket");
exit(1);
}
my_addr.sin_family = AF_INET;
my_addr.sin_port = htons(1352);
my_addr.sin_addr.s_addr = INADDR_ANY;
bzero(&(my_addr.sin_zero), 8);
if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct
sockaddr)) == -1) {
perror("bind");
exit(1);
}
if (listen(sockfd, 5) == -1) {
perror("listen");
exit(1);
}
gtk_entry_set_text(GTK_ENTRY(text), "Listening");
sin_size = sizeof(struct sockaddr_in);
if ((new_fd = accept(sockfd, (struct sockaddr *)&their_addr,
&sin_size)) == -1) {
perror("accept");
}
// we got a socket so set text box
gtk_entry_set_text(GTK_ENTRY(text), "Connection accepted");
// now create GIOChannel from connection
GIOChannel *iochannel = g_io_channel_unix_new(new_fd);
// now add to main event loop
GtkWidget *window = lookup_widget(GTK_WIDGET(button),
"MainWindow");
g_io_add_watch(iochannel, G_IO_IN, (GIOFunc *) &ReceiveData,
(gpointer) window);
// now close the listener
close(sockfd);
}
The function g_io_watch() ties to the G_IO_IN (there is data to read on
the socket) event to the function ReceiveData that is defined as
gboolean ReceiveData(GIOChannel *source, GIOCondition condition,
gpointer data)
{
gchar buf[500];
int bytes_read;
GtkWidget *text = NULL;
GQuark quark;
GError *error = NULL;
gint sd;
g_print("data received\n");
text = lookup_widget(GTK_WIDGET(data), "StatusText");
gtk_entry_set_text(GTK_ENTRY(text), "received data");
sd = g_io_channel_unix_get_fd(source);
bytes_read = recv(sd, buf, 500, 0);
if(bytes_read == -1) {
g_print("error\n");
}
else {
buf[bytes_read] = '\0';
g_print("buf = %s\n", buf);
text = lookup_widget(GTK_WIDGET(data), "ReceivedText");
gtk_entry_set_text(GTK_ENTRY(text), buf);
}
return TRUE;
}
The problem is this. If the client closes the connection then I get a
flood of empty buffers and the ReceiveData() function is repeatedly
called. What could cause this weird behavior?
Travis Miller
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