ssize_t
ath_waitpid (pid_t pid, int *status, int options)
{
return pth_waitpid (pid, status, options);
}
void* dnsrv_process_io(void* threadarg)
{
/* Get DNS IO info */
dns_io di = (dns_io)threadarg;
int retcode = 0;
int pid = 0;
int readlen = 0;
char readbuf[1024];
xstream xs = NULL;
sigset_t sigs;
#ifdef __CYGWIN__
dns_resend_list iternode = NULL;
#endif
sigemptyset(&sigs);
sigaddset(&sigs, SIGHUP);
sigprocmask(SIG_BLOCK, &sigs, NULL);
/* Allocate an xstream for talking to the process */
xs = xstream_new(di->mempool, dnsrv_process_xstream_io, di);
/* Transmit root element to coprocess */
pth_write(di->out, "<stream>", 8);
/* Transmit resend entries to coprocess */
#ifdef __CYGWIN__
iternode = di->svclist;
while (iternode != NULL) {
if (iternode->service) {
sprintf(readbuf, "<resend service=\"%s\">%s</resend>",
iternode->service, iternode->host);
} else {
sprintf(readbuf, "<resend>%s</resend>",
iternode->host);
}
pth_write(di->out, readbuf, strlen(readbuf));
iternode = iternode->next;
}
#endif
/* Loop forever */
while (1)
{
/* Hostname lookup completed from coprocess */
readlen = pth_read(di->in, readbuf, sizeof(readbuf));
if (readlen <= 0)
{
log_debug(ZONE,"dnsrv: Read error on coprocess: %d %s",errno,strerror(errno));
break;
}
if (xstream_eat(xs, readbuf, readlen) > XSTREAM_NODE)
break;
}
/* If we reached this point, the coprocess probably is dead, so
process the SIG_CHLD */
pid = pth_waitpid(di->pid, &retcode, 0);
if(pid == -1)
{
log_debug(ZONE, "pth_waitpid returned -1: %s", strerror(errno));
}
else if(pid == 0)
{
log_debug(ZONE, "no child available to call waitpid on");
}
else
{
log_debug(ZONE, "pid %d, exit status: %d", pid, WEXITSTATUS(retcode));
}
/* Cleanup */
close(di->in);
close(di->out);
di->out = 0;
log_debug(ZONE,"child returned %d",WEXITSTATUS(retcode));
if(WIFEXITED(retcode)) /* if the child exited normally */
{
log_debug(ZONE, "child being restarted...");
/* Fork out resolver function/process */
di->pid = dnsrv_fork_and_capture(dnsrv_child_main, di);
/* Start IO thread */
pth_spawn(PTH_ATTR_DEFAULT, dnsrv_process_io, (void*)di);
return NULL;
}
log_debug(ZONE, "child dying...");
return NULL;
}
