[socket] Preliminary - make socket configurable

Preliminary work to make socket configurable (enable and disable).

OTP-15658

3 files changed, 48 insertions, 5 deletions

diff --git a/erts/configure.in b/erts/configure.in
index 5f969a0a8b..f17572142d 100644
--- a/erts/configure.in
+++ b/erts/configure.in
@@ -1329,6 +1329,28 @@ LIBS=$zlib_save_LIBS
 fi
 AC_SUBST(Z_LIB)
 
+
+dnl -------------
+dnl esock
+dnl -------------
+
+AC_ARG_ENABLE(esock,
+AS_HELP_STRING([--enable-esock], [enable builtin experimental socket (as a nif) support (default)])
+AS_HELP_STRING([--disable-esock], [disable builtin experimental socket (as a nif) support]))
+
+dnl Default value
+USE_ESOCK=yes
+
+if test "x$enable_esock" = "xyes"; then
+    USE_ESOCK=yes
+else
+    if test "x$enable_esock" = "xno"; then
+        USE_ESOCK=no
+    fi
+fi
+AC_SUBST(USE_ESOCK)
+
+
 dnl
 dnl This test kindly borrowed from Tcl
 dnl
diff --git a/erts/emulator/Makefile.in b/erts/emulator/Makefile.in
index 448f41b523..1c85c4e827 100644
--- a/erts/emulator/Makefile.in
+++ b/erts/emulator/Makefile.in
@@ -843,6 +843,14 @@ ESOCK_RUN_OBJS = \
 	$(OBJDIR)/socket_dbg.o \
 	$(OBJDIR)/socket_tarray.o \
 	$(OBJDIR)/socket_util.o
+ifeq ($(USE_ESOCK), yes)
+ESOCK_NIF_OBJS = \
+	$(OBJDIR)/socket_nif.o \
+	$(OBJDIR)/net_nif.o
+else
+ESOCK_NIF_OBJS = \
+	$(OBJDIR)/net_nif.o
+endif
 else
 ESOCK_RUN_OBJS =
 endif
@@ -903,8 +911,7 @@ NIF_OBJS = \
 	$(OBJDIR)/prim_buffer_nif.o \
 	$(OBJDIR)/prim_file_nif.o \
 	$(OBJDIR)/zlib_nif.o \
-	$(OBJDIR)/socket_nif.o \
-	$(OBJDIR)/net_nif.o
+	$(ESOCK_NIF_OBJS)
 
 ifeq ($(TARGET),win32)
 DRV_OBJS = \
diff --git a/erts/preloaded/src/erl_init.erl b/erts/preloaded/src/erl_init.erl
index 6edead362c..a650367c25 100644
--- a/erts/preloaded/src/erl_init.erl
+++ b/erts/preloaded/src/erl_init.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 2000-2016. All Rights Reserved.
+%% Copyright Ericsson AB 2000-2019. All Rights Reserved.
 %%
 %% Licensed under the Apache License, Version 2.0 (the "License");
 %% you may not use this file except in compliance with the License.
@@ -35,8 +35,8 @@ start(Mod, BootArgs) ->
     erl_tracer:on_load(),
     prim_buffer:on_load(),
     prim_file:on_load(),
-    socket:on_load(),
-    net:on_load(),
+    conditional_load(socket), % socket:on_load(),
+    net:on_load(), % This needs to be loaded since it contains 'other' funcs...
     %% Proceed to the specified boot module
     run(Mod, boot, BootArgs).
 
@@ -48,3 +48,17 @@ run(M, F, A) ->
 	true ->
             M:F(A)
     end.
+
+conditional_load(Mod) ->
+    conditional_load(Mod, erlang:loaded()).
+
+conditional_load(_Mod, []) ->
+    ok;
+conditional_load(Mod, [Mod|_]) ->
+    Mod:on_load();
+conditional_load(Mod, [_|T]) ->
+    conditional_load(Mod, T).
+
+    
+
+