2  Removed Functionality

2 Removed Functionality

This document lists all removed functionality in Erlang/OTP. For more information regarding the strategy regarding removals see the documentation of Support, Compatibility, Deprecations, and Removal.

Communication over the Erlang distribution without support for large node container data types (version 4) was as of OTP 24 deprecated and support for it was scheduled for removal in OTP 26. That is, as of OTP 26, support for large node container data types will become mandatory. This also includes external term format produced by term_to_binary()/term_to_iovec().

The old link protocol used when communicating over the Erlang distribution was as of OTP 24 deprecated and support for it was scheduled for removal in OTP 26. As of OTP 26 the new link protocol became mandatory. That is, Erlang nodes will refuse to connect to nodes not implementing the new link protocol.

  • code:is_module_native/1 (HiPE has been removed)
  • code:rehash/0 (the code path cache feature has been removed)
  • disk_log:accessible_logs/0 (use disk_log:all/0 instead)
  • disk_log:lclose/1 (use disk_log:close/1 instead)
  • disk_log:lclose/2 (use disk_log:close/1 instead)
  • erts_alloc_config:_/_ (this module has as of OTP 26.0 been removed)
  • ftp:start_service/1 (use ftp:open/2 instead)
  • ftp:stop_service/1 (use ftp:close/1 instead)
  • httpd_util:decode_hex/1 (use uri_string:unquote function instead)
  • httpd_util:encode_hex/1 (use uri_string:quote function instead)
  • httpd_util:flatlength/1 (use erlang:iolist_size/1 instead)
  • httpd_util:hexlist_to_integer/1 (use erlang:list_to_integer/2 with base 16 instead)
  • httpd_util:integer_to_hexlist/1 (use erlang:integer_to_list/2 with base 16 instead)
  • httpd_util:strip/1 (use string:trim/1 instead)
  • httpd_util:suffix/1 (use filename:extension/1 and string:trim/2 instead)
  • filename:safe_relative_path/1 (use filelib:safe_relative_path/2 instead)
  • http_uri:parse/1 (use uri_string functions instead)
  • http_uri:parse/2 (use uri_string functions instead)
  • http_uri:scheme_defaults/0 (use uri_string functions instead)
  • public_key:ssh_decode/2 (use ssh_file:decode/2 instead)
  • public_key:ssh_encode/2 (use ssh_file:encode/2 instead)
  • public_key:ssh_hostkey_fingerprint/1 (use ssh:hostkey_fingerprint/1 instead)
  • public_key:ssh_hostkey_fingerprint/2 (use ssh:hostkey_fingerprint/2 instead)

The registry functionality part of erl_interface was as of OTP 23 deprecated and was removed in OTP 24.

The Erlang compiler now refuses to compile source files encoded in Latin-1 without a %% coding: latin-1 comment at the beginning of the file.

The igor and erl_tidy modules have been removed from OTP and is now maintained by their original author Richard Carlsson. They can be found at github.com/richcarl/igor and github.com/richcarl/erl_tidy, respectively.

The distributed disk_log feature was as of OTP 23 deprecated and was removed in OTP 24.

The Old API was removed in OTP 24. The support was formally deprecated as of OTP 23.

For replacement functions see the New API.

The pre-release version 3 encoding configs; prev3a, prev3b and prev3c was removed in OTP 24. Use the full version instead.

The (encoding) config option for the full version, {version3, 3}, will still be supported, even though its no longer necessary to specify it this way.

  • crypto:block_decrypt/3 (use crypto:crypto_one_time/4 or crypto:crypto_init/3 + crypto:crypto_update/2 + crypto:crypto_final/1 instead)
  • crypto:block_decrypt/4 (use crypto:crypto_one_time/5, crypto:crypto_one_time_aead/6,7 or crypto:crypto_(dyn_iv)?_init + crypto:crypto_(dyn_iv)?_update + crypto:crypto_final instead)
  • crypto:block_encrypt/3 (use crypto:crypto_one_time/4 or crypto:crypto_init/3 + crypto:crypto_update/2 + crypto:crypto_final/1 instead)
  • crypto:block_encrypt/4 (use crypto:crypto_one_time/5, crypto:crypto_one_time_aead/6,7 or crypto:crypto_(dyn_iv)?_init + crypto:crypto_(dyn_iv)?_update + crypto:crypto_final instead)
  • crypto:cmac/3 (use crypto:mac/4 instead)
  • crypto:cmac/4 (use crypto:macN/5 instead)
  • crypto:hmac/3 (use crypto:mac/4 instead)
  • crypto:hmac/4 (use crypto:macN/5 instead)
  • crypto:hmac_final/1 (use crypto:mac_final/1 instead)
  • crypto:hmac_final_n/2 (use crypto:mac_finalN/2 instead)
  • crypto:hmac_init/2 (use crypto:mac_init/3 instead)
  • crypto:hmac_update/2 (use crypto:mac_update/2 instead)
  • crypto:next_iv/_ (see the 'New and Old API' chapter of the CRYPTO User's guide)
  • crypto:poly1305/2 (use crypto:mac/3 instead)
  • crypto:stream_decrypt/2 (use crypto:crypto_update/2 instead)
  • crypto:stream_encrypt/2 (use crypto:crypto_update/2 instead)
  • crypto:stream_init/_ (use crypto:crypto_init/3 + crypto:crypto_update/2 + crypto:crypto_final/1 or crypto:crypto_one_time/4 instead)
  • filename:find_src/_ (use filelib:find_source/1,3 instead)
  • pg2:_/_ (this module was removed in OTP 24. Use 'pg' instead)
  • ssl:cipher_suites/0 (use cipher_suites/2,3 instead)
  • ssl:cipher_suites/1 (use cipher_suites/2,3 instead)
  • ssl:ssl_accept/_ (use ssl_handshake/1,2,3 instead)

Some parts of OTP has had limited VxWorks support, such as erl_interface. This support was removed in OTP 23. This limited support was formally deprecated as of OTP 22.

The old legacy erl_interface library (functions with prefix erl_) was removed in OTP 23. These parts of erl_interface has been informally deprecated for a very long time, and was formally deprecated in OTP 22. You typically want to replace the usage of the erl_interface library with the use of the ei library which also is part of the erl_interface application.

API functions in the module called httpd_conf was deprecated in favor of standard modules such as lists, string, filelib, and erlang. Formally deprecated as of OTP 18.

inets - httpd Apache config files

Support for the Apache-compatible config files was removed in OTP 23. A new config file format was introduced in OTP 12.

For security reasons SSL-3.0 is no longer supported at all.

  • erlang:get_stacktrace/0 (use the new try/catch syntax for retrieving the stack backtrace)
  • httpd_conf:check_enum/2 (use lists:member/2 instead)
  • httpd_conf:clean/1 (use string:strip/1 instead or possibly the re module)
  • httpd_conf:custom_clean/3 (use string:strip/1 instead or possibly the re module)
  • httpd_conf:is_directory/1 (use filelib:is_dir/1 instead)
  • httpd_conf:is_file/1 (use filelib:is_file/1 instead)
  • httpd_conf:make_integer/1 (use erlang:list_to_integer/1 instead)
  • os_mon_mib:_/_ (this module was removed in OTP 22.0)
  • asn1ct:decode/_ (use Mod:decode/2 instead)
  • asn1ct:encode/_ (use Mod:encode/2 instead)
  • erlang:hash/2 (use erlang:phash2/2 instead)
  • ssl:connection_info/1 (use ssl:connection_information/[1,2] instead)
  • ssl:negotiated_next_protocol/1 (use ssl:negotiated_protocol/1 instead)
  • core_lib:get_anno/1 (use cerl:get_ann/1 instead)
  • core_lib:is_literal/1 (use cerl:is_literal/1 instead)
  • core_lib:is_literal_list/1 (use cerl:is_literal_list/1 instead)
  • core_lib:literal_value/1 (use cerl:concrete/1 instead)
  • core_lib:set_anno/2 (use cerl:set_ann/2 instead)
  • erl_lint:modify_line/2 (use erl_parse:map_anno/2 instead)
  • erl_parse:get_attribute/2 (erl_anno:{column,line,location,text}/1 instead)
  • erl_parse:get_attributes/1 (erl_anno:{column,line,location,text}/1 instead)
  • erl_parse:set_line/2 (use erl_anno:set_line/2)
  • erl_scan:attributes_info/_ (use erl_anno:{column,line,location,text}/1 instead)
  • erl_scan:set_attribute/3 (use erl_anno:set_line/2 instead)
  • erl_scan:token_info/_ (use erl_scan:{category,column,line,location,symbol,text}/1 instead)
  • rpc:safe_multi_server_call/2 (use rpc:multi_server_call/2 instead)
  • rpc:safe_multi_server_call/3 (use rpc:multi_server_call/3 instead)

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