text: /* ISC license. */
  
  #include <errno.h>
  #include <skalibs/uint.h>
  #include <skalibs/bytestr.h>
  #include <skalibs/sgetopt.h>
  #include <skalibs/strerr2.h>
  #include <skalibs/buffer.h>
  #include <skalibs/tai.h>
  #include <skalibs/genalloc.h>
  #include <skalibs/random.h>
  #include <s6-dns/s6dns.h>
  
  #define USAGE "s6-dnsns [ -q ] [ -r ] [ -t timeout ] name"
  #define dieusage() strerr_dieusage(100, USAGE)
  
  int main (int argc, char const *const *argv)
  {
    genalloc ds = GENALLOC_ZERO ; /* array of s6dns_domain_t */
    tain_t deadline ;
    unsigned int i = 0 ;
    int flagqualify = 0 ;
    int flagunsort = 0 ;
    PROG = "s6-dnsns" ;
    for (;;)
    {
      register int opt = subgetopt(argc, argv, "qrt:") ;
      if (opt == -1) break ;
      switch (opt)
      {
        case 'q' : flagqualify = 1 ; break ;
        case 'r' : flagunsort = 1 ; break ;
        case 't' : if (!uint0_scan(subgetopt_here.arg, &i)) dieusage() ; break ;
        default : dieusage() ;
      }
    }
    argc -= subgetopt_here.ind ; argv += subgetopt_here.ind ;
    if (argc < 1) dieusage() ;
  
    tain_now_g() ;
    if (i) tain_from_millisecs(&deadline, i) ; else deadline = tain_infinite_relative ;
    tain_add_g(&deadline, &deadline) ;
    if (!s6dns_init()) strerr_diefu1sys(111, "s6dns_init") ;
    {
      register int r = s6dns_resolve_ns_g(&ds, argv[0], str_len(argv[0]), flagqualify, &deadline) ;
      if (r < 0) strerr_diefu2sys((errno == ETIMEDOUT) ? 99 : 111, "resolve ", argv[0]) ;
      if (!r) strerr_diefu4x(2, "resolve ", argv[0], ": ", s6dns_constants_error_str(errno)) ;
    }
    if (!genalloc_len(s6dns_domain_t, &ds)) return 1 ;
    if (flagunsort) random_unsort(ds.s, genalloc_len(s6dns_domain_t, &ds), sizeof(s6dns_domain_t)) ;
    {
      char buf[S6DNS_FMT_DOMAINLIST(genalloc_len(s6dns_domain_t, &ds))] ;
      unsigned int len = s6dns_fmt_domainlist(buf, S6DNS_FMT_DOMAINLIST(genalloc_len(s6dns_domain_t, &ds)), genalloc_s(s6dns_domain_t, &ds), genalloc_len(s6dns_domain_t, &ds), "\n", 1) ;
      if (!len) strerr_diefu1sys(111, "format result") ;
      if (buffer_put(buffer_1, buf, len) < 0) goto err ;
    }
    if (buffer_putflush(buffer_1, "\n", 1) < 0) goto err ;
    return 0 ;
   err:
    strerr_diefu1sys(111, "write to stdout") ;
  }
  