void usageerr(const char *fmt, ...) {
va_list al;
fputs("adnshost usage error: ",stderr);
va_start(al,fmt);
vfprintf(stderr,fmt,al);
va_end(al);
putc('\n',stderr);
quitnow(11);
}
int main(int argc, const char *const *argv)
{
struct timeval *tv, tvbuf;
adns_query qu;
void *qun_v;
adns_answer *answer;
int r, maxfd;
fd_set readfds, writefds, exceptfds;
const char *arg;
ensure_adns_init();
while ((arg= *++argv)) process_optarg(arg,&argv,0);
if (!ov_pipe && !ads) usageerr("no domains given, and -f/--pipe not used; try --help");
for (;;)
{
for (;;)
{
qu= ov_asynch ? 0 : outstanding.head ? outstanding.head->qu : 0;
r= adns_check(ads,&qu,&answer,&qun_v);
if ((r == EAGAIN) || (r == EWOULDBLOCK)) break;
if (r == ESRCH)
{
if (!ov_pipe) goto x_quit;
else break;
}
assert(!r);
query_done(qun_v,answer);
}
maxfd= 0;
FD_ZERO(&readfds);
FD_ZERO(&writefds);
FD_ZERO(&exceptfds);
if (ov_pipe)
{
maxfd= 1;
FD_SET(0,&readfds);
}
tv= 0;
adns_beforeselect(ads, &maxfd, &readfds,&writefds,&exceptfds, &tv,&tvbuf,0);
ADNS_CLEAR_ERRNO;
r= select(maxfd, &readfds,&writefds,&exceptfds, tv);
ADNS_CAPTURE_ERRNO;
if (r == -1)
{
if (errno == EINTR) continue;
sysfail("select",errno);
}
adns_afterselect(ads, maxfd, &readfds,&writefds,&exceptfds, 0);
if (ov_pipe && FD_ISSET(0,&readfds)) read_stdin();
}
x_quit:
if (fclose(stdout)) outerr();
quitnow(rcode);
}
void of_help(const struct optioninfo *oi, const char *arg, const char *arg2) {
printusage();
if (fclose(stdout)) sysfail("finish writing output",errno);
quitnow(0);
}
void sysfail(const char *what, int errnoval)
{
fprintf(stderr,"adnshost failed: %s: %s\n",what,strerror(errnoval));
quitnow(10);
}
