Hello,
I am trying to write a sane backend for my scanner, and I just can't debug
it with gdb. When I set a breakpoint in my buggy function, the stack seems ok,
but I can't access local variables. Parameters are available. I forced static
build of scanimage by adding '-all-static' to libtool in the Makefile.
Here's a sample of what I get when debugging scanimage:
Breakpoint 2, sane_get_parameters (h=0x806b568, parms=0xbfff73d4) at dll-s.c:40
40 return ENTRY(get_parameters) (h, parms);
(gdb) s
sane_dll_get_parameters (handle=0x806b568, params=0xbfff73d4) at dll.c:820
820 DBG(3, "get_parameters(handle=%p,params=%p)\n", handle, params);
(gdb) n
821 return (long) (*s->be->op[OP_GET_PARAMS]) (s->handle, params);
(gdb) s
sane_umax_pp_get_parameters (handle=0x806b670, params=0xbfff73d4)
at umax_pp.c:1193
1193 Umax_PP_Device *dev = handle;
(gdb) n
1199 if (strcmp (dev->val[OPT_MODE].s, "Gray") == 0)
(gdb) p dev
No symbol "dev" in current context.
(gdb) bt
#0 sane_umax_pp_get_parameters (handle=0x806b670, params=0xbfff73d4)
at umax_pp.c:1199
#1 0x804d984 in sane_dll_get_parameters (handle=0x806b568, params=0xbfff73d4)
at dll.c:821
#2 0x804cb7e in sane_get_parameters (h=0x806b568, parms=0xbfff73d4)
at dll-s.c:40
#3 0x804abe6 in scan_it () at scanimage.c:1012
#4 0x804c073 in main (argc=4, argv=0xbffff88c) at scanimage.c:1706
#5 0x4008a2e7 in __libc_start_main (main=0x804b630 <main>, argc=4,
argv=0xbffff88c, init=0x8048fb0 <_init>, fini=0x806134c <_fini>,
rtld_fini=0x40009f00 <_dl_fini>, stack_end=0xbffff884)
at ../sysdeps/generic/libc-start.c:90
(gdb) p handle
$3 = 0x806b670
I surely missed something, but what ?
Stef
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