On a ...ahem ... Debian sarge box ... ahem ... I get another gdb, not stating gethostbyname but getservbyname which is called right after gethostbyname() gdb output; (gdb) bt #0 0x40011a14 in realloc () from /lib/ld-linux.so.2 #1 0x40006381 in _dl_map_object () from /lib/ld-linux.so.2 #2 0x40123e3a in getutmpx () from /lib/libc.so.6 #3 0x4000c016 in _dl_catch_error () from /lib/ld-linux.so.2 #4 0x40124676 in _dl_open () from /lib/libc.so.6 #5 0x401259b3 in _dl_mcount_wrapper_check () from /lib/libc.so.6 #6 0x4000c016 in _dl_catch_error () from /lib/ld-linux.so.2 #7 0x4012596e in _dl_mcount_wrapper_check () from /lib/libc.so.6 #8 0x40125a68 in __libc_dlopen_mode () from /lib/libc.so.6 #9 0x40104478 in __nss_lookup_function () from /lib/libc.so.6 #10 0x4010403f in __nss_database_lookup () from /lib/libc.so.6 #11 0x40105e73 in __nss_hostname_digits_dots () from /lib/libc.so.6 #12 0x401095c8 in getservbyname_r () from /lib/libc.so.6 #13 0x40109416 in getservbyname () from /lib/libc.so.6 #14 0x08048d34 in http_send_recv (hostname=0x804919b "www.oliver-block.eu", request=0x804917f "GET /checkip.php /HTTP1.1\r\n") at ddnscli.c:166 #15 0x08048e14 in get_ip () at ddnscli.c:191 #16 0x08048ef6 in main (argc=5, argv=0xbffffb24) at ddnscli.c:243 -- Leben ist mehr als ... <http://www.nak-nrw.de/index.php?id=71>