[erlang-questions] SCTP support

[Kukosa, Tomas]

Hello,

I have problem with opening SCTP socket. See
-----------
Erlang R13B04 (erts-5.7.5) [source] [64-bit] [smp:2:2] [rq:2] [async-threads:0] [hipe] [kernel-poll:false]

Eshell V5.7.5 (abort with ^G)
1> gen_sctp:open().
** exception error: bad argument
in function gen_sctp:open/1
called as gen_sctp:open([])
2>
-------------

I try it on SLES 11 64bit (kernel 2.6.27).

SCTP on this system works well if I use sctp_darn (from lksctp-tools package) or if I use OpenJDK7 with SCTP support.

Erlang/OTP has been configured and compiled with --enable-sctp option.

What shall I check to find where the problem could be?

When I try to localize problem I have found that following call fails:
2> prim_inet:open(sctp).
{error,badarg}

Any hint is welcome.

Best regards,
Tomas
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[Mark Wallis]

Hi Tomas,

I ran into the same issue with RB13B04 on RH ES running 2.6.18-92 with
lksctp1.0.9 that I had installed from source.

In the end I removed 1.0.9 and installed an RPM for lksctp 1.0.7 and after
that Erlang SCTP worked. I expect the problem was due to the way I had
installed 1.0.9 and not a dependency on 1.0.7 but this should you some idea
where to look.

Regards

Mark.

[Anders Nygren]

Do You have lksctp-tools-devel installed?

/Anders

[shehan]

Hi Tomas,
Pls install below lksctp RPMS.Then problem should be solved.

lksctp-tools

lksctp-tools-doc

lksctp-tools-devel

Br,
Shehan

Hello,

Any hint is welcome.

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[Kukosa, Tomas]

Hi Shehan,

I had already lksctp-tools and lksctp-tools-devel installed.
Also output of Erlan configuration and make looks good from SCTP point of view.

checking for netinet/sctp.h... yes
checking whether SCTP_UNORDERED is declared... yes
checking whether SCTP_ADDR_OVER is declared... yes
checking whether SCTP_ABORT is declared... yes
checking whether SCTP_EOF is declared... yes
checking whether SCTP_SENDALL is declared... no
checking whether SCTP_ADDR_CONFIRMED is declared... yes
checking for struct sctp_paddrparams.spp_pathmtu... yes
checking for struct sctp_paddrparams.spp_sackdelay... yes
checking for struct sctp_paddrparams.spp_flags... yes
checking for struct sctp_remote_error.sre_data... yes
checking for struct sctp_send_failed.ssf_data... yes

I tried also precompiled Erlang from SUSE repository (http://download.opensuse.org/repositories/devel:/languages:/erlang/SLE_11/x86_64/)
but unfortunately with the same result.

Any other idea what to check?

I will try what happens on 32bit system.

Best regards,
Tomas

[Raimo Niskanen]

The symptom you describe:
> 2> prim_inet:open(sctp).
> {error,badarg}
suggests that the emulator has/finds no sctp support.

Check your build logs, that you run what you build
and then check whith strace what happens during emulator start:

$ strace -f -o strace.txt erl
Erlang R13B04 (erts-5.7.5.1) [64-bit] [smp:4:4] [rq:4] [async-threads:0] [kernel-poll:false]

Eshell V5.7.5.1 (abort with ^G)
1> [Ctrl-\]
$

$ less strace.txt # search for libsctp

There should be a section that tries to load libsctp.so from
several locations and one should succeed or the sctp socket
open will fail. Such as:

13418 open("/home/raimo/lib/tls/x86_64/libsctp.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
13418 open("/home/raimo/lib/tls/libsctp.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
13418 open("/home/raimo/lib/x86_64/libsctp.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
13418 open("/home/raimo/lib/libsctp.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
13418 open("/opt/local/lib/tls/x86_64/libsctp.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
13418 open("/opt/local/lib/tls/libsctp.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
13418 open("/opt/local/lib/x86_64/libsctp.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
13418 open("/opt/local/lib/libsctp.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
13418 open("/usr/local/lib/tls/x86_64/libsctp.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
13418 open("/usr/local/lib/tls/libsctp.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
13418 open("/usr/local/lib/x86_64/libsctp.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
13418 open("/usr/local/lib/libsctp.so.1", O_RDONLY) = 7

--

/ Raimo Niskanen, Erlang/OTP, Ericsson AB

[Kukosa, Tomas]

Thank you very much for hints!

I have found that it did not try to load libsctp at all.

When I clear everything and run ./configure and make again it works now.

Thanks again for support.

Tomas

1> X=gen_sctp:open().
{ok,#Port<0.503>}
2> {ok,S}=X.
{ok,#Port<0.503>}
3> gen_sctp:close(S).
ok
4>