Hello,
I have a small demo app. This works on FreeBSD but I can't
get to work on Linux. I know that in Linux setsid will fail
if the child has the same session_id as the parent. So on
Linux you must fork twice. But it also seems that the parent
must do an exit. And I don't want that. The code is not very
long - so I include it here.
---<snipp>---
//----------------------------------------------------------------------
//
// $Id: GtkFork.c,v 1.2 2008/07/07 20:29:17 gorhas Exp $
//
// Experiment to run a thing in background
// This works on FreeBSD but not on Linux...
//
// Build with
//
// CFLAGS := `pkg-config glib-2.0 --cflags` `pkg-config gtk+-2.0
--cflags`
// LDFLAGS := `pkg-config glib-2.0 --libs` `pkg-config gtk+-2.0 --libs`
//
// cc $(CFLAGS) -o GtkFork GtkFork.c $(LDFLAGS)
//
//----------------------------------------------------------------------
#include <gtk/gtk.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <string.h>
//----------------------------------------------------------------------
// run_btn_callback
//
// Try to run something in the background
//
//----------------------------------------------------------------------
static void run_btn_callback (GtkWidget *button, gpointer data)
{
int loops_to_run = 0;
int i = 0;
int pid = -1;
int ret = -1;
// Skriv ut innehållet på skärmen
printf("Clicked..\n");
printf("Data was: %s\n", gtk_entry_get_text( data ));
loops_to_run = atoi( gtk_entry_get_text(data));
// We dont want to wait very long...
if( loops_to_run > 60 )
{
loops_to_run = 60;
printf("Adjusting to 60 loops...\n");
}
printf("Loops to run: %d\n", loops_to_run );
printf("We make a daemon\n");
if ( ( pid = fork() ) < 0 )
{
// Something went wrong
printf("We could not fork.... just exit");
exit(-1);
}
else if ( pid != 0 )
{
// This is the parent process
printf("The background process have pid: %d\n", pid);
return;
}
// Quit gtk
gtk_main_quit();
// Become session leader
ret = setsid();
if( ret == -1 )
{
perror("We could not be session leader\n");
exit(-1);
}
// Set umask for safety
umask(0);
// Set root dir
chdir("/");
for( i = 0; i < loops_to_run; i++ )
{
printf("We are running: %d\n", i );
sleep(1);
}
exit(0);
}
//----------------------------------------------------------------------
// When we quit
//----------------------------------------------------------------------
static void quit_callback()
{
gtk_main_quit ();
}
//----------------------------------------------------------------------
// main
//
// Creates a gtk windows to specify how many loops
// the daemon should run.
//
//----------------------------------------------------------------------
int
main (int argc, char **argv)
{
GtkWidget *mainwin = 0L;
GtkWidget *number_entry = 0L;
GtkWidget *run_btn = 0L;
GtkWidget *vbox = 0L;
/* Initialize i18n support */
printf("Locale is: %s\n", gtk_set_locale () );
/* Initialize the widget set */
gtk_init (&argc, &argv);
/* Create the main window */
mainwin = gtk_window_new (GTK_WINDOW_TOPLEVEL);
/* Set up our GUI elements */
vbox = gtk_vbox_new (FALSE, 0);
number_entry = gtk_entry_new();
run_btn = gtk_button_new_with_label("Just run");
gtk_container_add (GTK_CONTAINER (mainwin), vbox);
gtk_box_pack_start (GTK_BOX (vbox), number_entry, TRUE, TRUE, 0);
gtk_box_pack_start (GTK_BOX (vbox), run_btn, TRUE, TRUE, 0);
// Function to call when main window is destroyed
g_signal_connect (G_OBJECT (mainwin),
"destroy",
GTK_SIGNAL_FUNC (quit_callback),
NULL);
// Function to call when we click the button
g_signal_connect(GTK_OBJECT(run_btn), "clicked",
G_CALLBACK(run_btn_callback),
number_entry);
/* Show the application window */
gtk_widget_show_all (mainwin);
/* Enter the main event loop, and wait for user interaction */
gtk_main ();
/* The user lost interest */
return 0;
}
//------------------------------------------------------------------
// END
//------------------------------------------------------------------
---<snipp>---
--
Göran Hasse
----------------------------------------------------------------
Göran Hasse email: [EMAIL PROTECTED] Tel: 019-450105
Raditex AB http://www.raditex.se
Planiavägen 15, 1tr Mob: 070-5530148
131 34 NACKA, SWEDEN OrgNr: 556240-0589
VAT: SE556240058901
------------------------------------------------------------------
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