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-rw-r--r--slirp/ctl.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/slirp/ctl.h b/slirp/ctl.h
index 4a8576d..854ae9a 100644
--- a/slirp/ctl.h
+++ b/slirp/ctl.h
@@ -2,6 +2,9 @@
#define CTL_EXEC 1
#define CTL_ALIAS 2
#define CTL_DNS 3
+/* NOTE: DNS_ADDR_MAX addresses, starting from CTL_DNS, are reserved */
+
+#define CTL_IS_DNS(x) ((unsigned)((x)-CTL_DNS) < (unsigned)dns_addr_count)
#define CTL_SPECIAL "10.0.2.0"
#define CTL_LOCAL "10.0.2.15"