#> gdb ./nsquerytest
(gdb) run
...
Attempt 0
Attempt 1
...
Program received signal SIGSEGV, Segmentation fault.
0xb7e24a17 in __libc_res_nquery () from /lib/libresolv.so.2
(gdb) bt full
#0  0xb7e24a17 in __libc_res_nquery () from /lib/libresolv.so.2
#1  0xb7e24f8b in __libc_res_nquerydomain () from /lib/libresolv.so.2
#2  0xb7e253c5 in __libc_res_nsearch () from /lib/libresolv.so.2
#3  0xb7fcf8e0 in _nss_dns_gethostbyname4_r () from /lib/libnss_dns.so.2
#4  0xb7f111a3 in gaih_inet () from /lib/libc.so.6
#5  0xb7f140d5 in getaddrinfo () from /lib/libc.so.6
#6  0x080484d0 in main (argc=1, argv=0xbfffed34) at nsquerytest.c:17
        i = 4
        ai = 0x0
        hints = {ai_flags = 32, ai_family = 0, ai_socktype = 1, ai_protocol = 0, ai_addrlen = 0, ai_addr = 0x0, ai_canonname = 0x0, ai_next = 0x0}