[erlang-questions] SCTP support

[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



On Fri, Jun 11, 2010 at 08:54:53AM +0200, Kukosa, Tomas wrote:
> 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
>  
> 
> -----Original Message-----
> From: erlang-questions@REDACTED [mailto:erlang-questions@REDACTED] On Behalf Of shehan
> Sent: Friday, June 11, 2010 4:00 AM
> To: Kukosa, Tomas
> Cc: erlang-questions@REDACTED
> Subject: RE: [erlang-questions] SCTP support
> 
> Hi Tomas,
> Pls install below lksctp RPMS.Then problem should be solved.
> 
> lksctp-tools
> 
> lksctp-tools-doc
> 
> lksctp-tools-devel
> 
> Br,
> Shehan
> -----Original Message-----
> From: erlang-questions@REDACTED [mailto:erlang-questions@REDACTED] On
> Behalf Of Kukosa, Tomas
> Sent: Thursday, June 10, 2010 7:08 PM
> To: erlang-questions@REDACTED
> Subject: [erlang-questions] SCTP support
> 
> 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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-- 

/ Raimo Niskanen, Erlang/OTP, Ericsson AB