Terminate address filter with OS_AF_NULL instead of 0 (AF_UNSPEC)

Signed-off-by: Jeroen Koekkoek <jeroen@koekkoek.nl>

src/core/ddsi/src/ddsi_eth.c

@@ -13,7 +13,7 @@
 
 int ddsi_eth_enumerate_interfaces(ddsi_tran_factory_t fact, os_ifaddrs_t **ifs)
 {
-    int afs[] = { AF_INET, 0 };
+    int afs[] = { AF_INET, OS_AF_NULL };
 
     (void)fact;
 

src/core/ddsi/src/ddsi_raweth.c

@@ -349,7 +349,7 @@ static void ddsi_raweth_deinit(void)
 
 static int ddsi_raweth_enumerate_interfaces (ddsi_tran_factory_t factory, os_ifaddrs_t **interfs)
 {
-  int afs[] = { AF_PACKET, 0 };
+  int afs[] = { AF_PACKET, OS_AF_NULL };
 
   (void)factory;
 

src/os/include/os/os_socket.h

@@ -110,6 +110,8 @@ extern "C" {
 
 #define SD_FLAG_IS_SET(flags, flag) ((((uint32_t)(flags) & (uint32_t)(flag))) != 0U)
 
+#define OS_AF_NULL (-1)
+
     /** Network interface attributes */
     typedef struct os_ifaddrs_s {
         struct os_ifaddrs_s *next;
@@ -134,7 +136,7 @@ extern "C" {
      * @param[in] afs NULL-terminated array of address families (AF_xyz) to
      *                restrict resulting set of network interfaces too. NULL to
      *                return all network interfaces for all supported address
-     *                families.
+     *                families. Terminate the array with OS_AF_NULL.
      *
      * @returns Returns zero on success or a valid errno value on error.
      */

src/os/src/os_socket.c

@@ -52,7 +52,8 @@ const int afs[] = {
 #if OS_SOCKET_HAS_IPV6
     AF_INET6,
 #endif /* OS_SOCKET_HAS_IPV6 */
-    AF_INET
+    AF_INET,
+    OS_AF_NULL /* Terminator */
 };
 
 const int *const os_supp_afs = afs;

src/os/src/posix/os_platform_ifaddrs.c

@@ -83,7 +83,7 @@ os_getifaddrs(
             sa = sys_ifa->ifa_addr;
             if (sa != NULL) {
                 use = 0;
-                for (int i = 0; !use && afs[i] != 0; i++) {
+                for (int i = 0; !use && afs[i] != OS_AF_NULL; i++) {
                     use = (sa->sa_family == afs[i]);
                 }
 

src/os/src/windows/os_platform_ifaddrs.c

@@ -237,7 +237,7 @@ os_getifaddrs(
             {
                 sa = (struct sockaddr *)addr->Address.lpSockaddr;
                 use = 0;
-                for (int i = 0; !use && afs[i] != 0; i++) {
+                for (int i = 0; !use && afs[i] != OS_AF_NULL; i++) {
                     use = (afs[i] == sa->sa_family);
                 }
 

src/os/tests/ifaddrs.c

@@ -65,7 +65,7 @@ CUnit_Test(os_getifaddrs, ipv4)
     int err;
     int seen = 0;
     os_ifaddrs_t *ifa_root, *ifa;
-    const int afs[] = { AF_INET, 0 };
+    const int afs[] = { AF_INET, OS_AF_NULL };
 
     err = os_getifaddrs(&ifa_root, afs);
     CU_ASSERT_EQUAL_FATAL(err, 0);
@@ -109,7 +109,7 @@ CUnit_Test(os_getifaddrs, empty_filter)
 {
     int err;
     os_ifaddrs_t *ifa_root;
-    const int afs[] = { 0 };
+    const int afs[] = { OS_AF_NULL };
 
     err = os_getifaddrs(&ifa_root, afs);
     CU_ASSERT_EQUAL_FATAL(err, 0);
@@ -125,7 +125,7 @@ CUnit_Test(os_getifaddrs, ipv6)
         int err;
         int have_ipv6 = 0;
         os_ifaddrs_t *ifa_root, *ifa;
-        const int afs[] = { AF_INET6, 0 };
+        const int afs[] = { AF_INET6, OS_AF_NULL };
 
         err = os_getifaddrs(&ifa_root, afs);
         CU_ASSERT_EQUAL_FATAL(err, 0);
@@ -161,7 +161,7 @@ CUnit_Test(os_getifaddrs, ipv4_n_ipv6)
         int have_ipv4 = 0;
         int have_ipv6 = 0;
         os_ifaddrs_t *ifa_root, *ifa;
-        const int afs[] = { AF_INET, AF_INET6, 0 };
+        const int afs[] = { AF_INET, AF_INET6, OS_AF_NULL };
 
         err = os_getifaddrs(&ifa_root, afs);
         CU_ASSERT_EQUAL_FATAL(err, 0);