Re: glib 1.2 way of doing a tar/find backup?

[Ruben Safir Secretary NYLXS <ruben mrbrklyn com>]

Somewhere on the NYLXS server is a jounral article on writing a GTK backup program
which I wrote and which will help you.

Do a google search for it.

Ruben

        
        
        On Fri, Sep 10, 2004 at 01:06:50AM -0400, Tony Freeman wrote:
> Thanks Jared,
>
> It took me a good portion of the day after reading this email, but I
> finally figured out how to use popen correctly.  I'm a slow learner, I
> guess.  After doing a man on popen and not seeing an example, I did a
> google and found lots of the same type of example that didn't really
> seem to fit what I needed; which was to launch the process and run the
> status bar until the process finished.  It turns out that I only needed
> to change just a few lines of my code!
>
> So ... for others looking for an example of how to run a gtk progress
> bar until a process is finished:
>
> void create_tar_file (GtkButton *button, gchar *day)
> {
>       FILE *fp;
>       GtkLabel *main_label;
>       main_label = (gpointer)lookup_widget(GTK_WIDGET(button), "label_main");
>       
>       GtkProgressBar *progress_bar1;
>       progress_bar1 = (gpointer)lookup_widget(GTK_WIDGET(button),
> "progressbar1");
>       
>       gchar *update_label;
>       gchar *backup_command;
>       gchar thisyear[10], thismonth[10], thisday[10];
>       gint cmin_start, cmin_stop;
>       gchar string_start[10], string_end[10];
>       gint child_stat = 0;
>       gboolean test = TRUE;
>       gint process_status;
>       gint progress = 0;
>       pid_t pid;
>
>       sprintf(thisyear, "%d", today_year);
>       sprintf(thismonth, "%02.f", (gfloat)today_month);
>       sprintf(thisday, "%02.f", (gfloat)today_date);
>       
>       g_print("\nSTART OF BACKUP FUNCTION\n");
>       update_label = g_strconcat("Please Wait:\nArchiving ", day, " Files",
> NULL);
>       gtk_label_set_text(main_label, update_label);
>       
>       cmin_start = ((gint)g_hash_table_lookup(daysTable, day)) -
> ((gint)((24.0 - start_sun) * 60));
>       cmin_stop = ((gint)g_hash_table_lookup(daysTable, day)) - ((gint)((24.0
> - end_sun) * 60));
>       
>       sprintf(string_start, "%d", cmin_start);
>       sprintf(string_end, "%d", cmin_stop);
>       
>       backup_command = g_strconcat(find_exe, " /usr/share -type f -exec tar
> -rf /tmp/", thisyear, thismonth, thisday, ".tar {} \\;", NULL);
>
>       g_print("BACKUP COMMAND: \n\t%s\n", backup_command);
>       
>       pid = fork();
>       if (pid == -1) {
>               g_error("Forking Failed");
>       } else if (pid == 0) {
>               // This is the child .... all code for the child.
>               g_print("\nCHILD: Running backup command.\n");
>               if ((fp = popen(backup_command, "r")) == NULL) {
>                       g_error("The child process exited abnormally while trying to execute
> the backup command");
>                       _exit(-1);
>               }
>               pclose(fp);
>       } else {
>               // This is the parent ... all code for the parent.
>               while (test) {
>                       process_status = waitpid((pid_t)pid, &child_stat, WNOHANG);
>                       if (process_status == 0) {
>                               // process still running ... update progress bar.
>                               gtk_progress_set_value (GTK_PROGRESS (progress_bar1), progress);
>                               progress = (progress + 1) % 100;
>                               gtk_main_iteration();
>                               test = TRUE;
>                       } else if (process_status == pid) {
>                               g_print("Child exited: Stopping progress bar.\n");
>                               update_label = g_strconcat("Finished Archiving ", day, " Files.",
> NULL);
>                               gtk_label_set_text(main_label, update_label);
>                               g_print("Finished Archiving %s Files\n", day);
>                               g_free(backup_command);
>                               test = FALSE;
>                       } else {
>                               g_error("Some sort of error while checking process_status\n");
>                               test = FALSE;
>                               _exit(-1);
>                       }
>               }
>       }
>       g_print("\nEND OF BACKUP FUNCTION\n");
> }
>
>
>
> --Tony
>
> On Thu, 2004-09-09 at 06:04, Jared Kells wrote:
> > I would have a look at popen, this is the clasic unix way of doing
> > something like that. Same as system but returns a c FILE* you read and
> > write to like a normal file that is connected to the stdin/out of the
> > command you are executing so you can read the output into your program
> > and work out progress that sort of thing. Also doesn't block..
> >
> > man popen
> >
> > On Thu, 2004-09-09 at 19:52, John Cupitt wrote:
> > > ahem, of course that's "its" not "it's"
> > >
> > > On Thu, 9 Sep 2004 09:52:13 +0000, John Cupitt <jcupitt gmail com> wrote:
> > > > Hi,
> > > >
> > > > On Thu, 09 Sep 2004 01:03:08 -0400, Tony Freeman
> > > > <tony freeman insightbb com> wrote:
> > > > > I can tar and gzip the data
> > > > > really easy into a temp directory using a shell command:
> > > > >
> > > > > tar -czf /tmp/20040808_backup.tar.gz `find /data/monday -daystart -cmin
> > > > > +1440 -cmin -2880`
> > > > >
> > > > > How can I do this in C/glib/gtk =< 1.2?
> > > >
> > > > The easiest is system( "my-shell-command" ); although your interface
> > > > will appear to lock up while it does it's work. If you want to stay
> > > > live and give feedback, the next easiest is to run the shell command
> > > > as a background job (just put an "&" at the end) and poll in a timeout
> > > > for completion (in my opinion).
> > > _______________________________________________
> > > gtk-app-devel-list mailing list
> > > gtk-app-devel-list gnome org
> > > http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
>
> _______________________________________________
> gtk-app-devel-list mailing list
> gtk-app-devel-list gnome org
> http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list

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