[esock|test] Add (stream) sendmsg and recvmsg test case for local

Add a sendmsg and recvmsg test case for a unix domain (stream) socket.

Found and fixed a bug for the return value for the address field
for family 'local' (encoded as 'inet').

OTP-15822

2 files changed, 2 insertions, 2 deletions

diff --git a/erts/emulator/nifs/common/socket_nif.c b/erts/emulator/nifs/common/socket_nif.c
index 7484694cdb..d8203f3b91 100644
--- a/erts/emulator/nifs/common/socket_nif.c
+++ b/erts/emulator/nifs/common/socket_nif.c
@@ -15180,7 +15180,7 @@ char* encode_msghdr(ErlNifEnv*       env,
             "\r\n   read: %d"
             "\r\n", read) );
 
-    /* The address is not used if we are connected,
+    /* The address is not used if we are connected (unless family is 'local'),
      * so check (length = 0) before we try to encodel
      */
     if (msgHdrP->msg_namelen != 0) {
diff --git a/erts/emulator/nifs/common/socket_util.c b/erts/emulator/nifs/common/socket_util.c
index a61cfc75ef..4ba48afcfa 100644
--- a/erts/emulator/nifs/common/socket_util.c
+++ b/erts/emulator/nifs/common/socket_util.c
@@ -1656,7 +1656,7 @@ char* make_sockaddr_un(ErlNifEnv*    env,
                        ERL_NIF_TERM* sa)
 {
     ERL_NIF_TERM keys[] = {esock_atom_family, esock_atom_path};
-    ERL_NIF_TERM vals[] = {esock_atom_inet, path};
+    ERL_NIF_TERM vals[] = {esock_atom_local,  path};
     unsigned int numKeys = sizeof(keys) / sizeof(ERL_NIF_TERM);
     unsigned int numVals = sizeof(vals) / sizeof(ERL_NIF_TERM);