if (gethostname(hostname, hostname_len) != 0) {
fprintf(stderr, "`gethostname' failed and no "
"hostname was configured.\n");
return -1;
}
if (gethostname(hostname, hostname_len) != 0) {
fprintf(stderr, "`gethostname' failed and no "
"hostname was configured.\n");
return -1;
}