callbacks - debug

[David Coquil <dcoquil lisi insa-lyon fr>]

Hi,

Signal callabcks are generally of the form :
void callback_func(GtkWidget *widget, gpointer data)
and event callbacks are generally of the form :
void callback_func(GtkWidget *widget, GdkEvent *event, gpointer data)

I wonder how much I can reasonably change this in my own callbacks ? Can I
declare callback functions with no widget/data if I don't have any use for
those parameters ? Same with the event param in the case of event callbacks
?

>From my loose tries, it doesn't seem to create problems, but is there any
catch ?

And now for something completly unrelated :
when I run my app under gdb, it crashes one time out of two with :

Program received signal SIGUSR1, User defined signal 1.
0x40487047 in pause () from /lib/libc.so.6

#backtrace

#0  0x40487047 in pause () from /lib/libc.so.6
#1  0x40373a73 in esd_open_sound () from /usr/lib/libesd.so.0
#2  0x40364eca in gnome_sound_init () from /usr/lib/libgnome.so.32
#3  0x40366bda in gnome_paper_convert_to_points () from /usr/lib/libgnome.so.32
#4  0x4036cb27 in poptSetExecPath () from /usr/lib/libgnomesupport.so.0
#5  0x4036caef in poptSetExecPath () from /usr/lib/libgnomesupport.so.0
#6  0x4036d466 in poptGetNextOpt () from /usr/lib/libgnomesupport.so.0
#7  0x40363ba9 in gnomelib_parse_args () from /usr/lib/libgnome.so.32
#8  0x400858b9 in gnome_init_with_popt_table () from /usr/lib/libgnomeui.so.32
#9  0x40085926 in gnome_init () from /usr/lib/libgnomeui.so.32
#10 0x804ae54 in main (argc=1, argv=0xbffffaf4) at gminifoot.c:11

gminifoot.c:11 is a call to gnome_init

The faq recommends running apps under gdb with --sync but obviously this
doesn't change anything in this case. Any ideas, please ?

--
David Coquil