[socket-nif] Add support for socket (level otp) buffer options

Add support for otp level socket options rcvbuf, rcvctrlbuf and
sndctrlbuf. These options define default sizes for these
buffers.
The 'rcvbuf' is used when receiving messages when calling
the recv, recvfrom and recvmsg functions.
The 'rcvctrlbuf' is used for the control message header info
when calling the recvmsg function.
The 'sndctrlbuf' is used for the control message header info
when calling the sendmsg function.

OTP-14831

1 files changed, 6 insertions, 0 deletions

diff --git a/erts/emulator/nifs/common/socket_util.h b/erts/emulator/nifs/common/socket_util.h
index a38453e238..1b5d003155 100644
--- a/erts/emulator/nifs/common/socket_util.h
+++ b/erts/emulator/nifs/common/socket_util.h
@@ -158,6 +158,12 @@ char* esock_encode_protocol(ErlNifEnv*    env,
                             ERL_NIF_TERM* eProtocol);
 
 extern
+char* esock_decode_bufsz(ErlNifEnv*   env,
+                         ERL_NIF_TERM eVal,
+                         size_t       defSz,
+                         size_t*      sz);
+
+extern
 BOOLEAN_T esock_decode_string(ErlNifEnv*         env,
                               const ERL_NIF_TERM eString,
                               char**             stringP);