Move IPPROTO_MPTCP test into anet.h

Signed-off-by: zhenwei pi <[email protected]>

Author: pizhenwei

src/anet.h

@@ -75,4 +75,12 @@ int anetSetSockMarkId(char *err, int fd, uint32_t id);
 int anetGetError(int fd);
 int anetIsFifo(char *filepath);
 
+static inline int anetHasMptcp(void) {
+#ifdef IPPROTO_MPTCP
+    return 1;
+#else
+    return 0;
+#endif
+}
+
 #endif

src/config.c

@@ -2428,15 +2428,11 @@ static int isValidIpV6(char *val, const char **err) {
 }
 
 static int isValidMptcp(int val, const char **err) {
-#ifndef IPPROTO_MPTCP
-    if (val) {
+    if (val && !anetHasMptcp()) {
         *err = "MPTCP is not supported on this platform";
         return 0;
     }
-#else
-    UNUSED(val);
-    UNUSED(err);
-#endif
+
     return 1;
 }