gdb> r
`/home/usr/lisp-0.0.1/src/test' has changed; re-reading symbols.
Failed to read a valid object file image from memory.

Breakpoint 1, main () at test.c:11
11        int algo = _strlen ("esto");
gdb> n
13        printf ("%i\n", algo);
gdb> info registers 
eax            0x4      4
ecx            0xbfd07c30       -1076855760
edx            0x1      1
ebx            0x804857c        134514044
esp            0xbfd07c00       0xbfd07c00
ebp            0xbfd07c18       0xbfd07c18
esi            0xb7f76ce0       -1208521504
edi            0x0      0
eip            0x804847d        0x804847d <main+29>
eflags         0x246    [ PF ZF IF ]
cs             0x73     115
ss             0x7b     123
ds             0x7b     123
es             0x7b     123
fs             0x0      0
gs             0x33     51
gdb> p/d algo
$1 = 0
gdb>