Socket.getservbyname fails even if the service is defined in /etc/services

Given this functionality is probably needed by Jython as well, it could be put in a separate java library.

It could use the native getservent/getservbyname() api if available, else it could fall back to parsing /etc/services, with a final fallback to a hardcoded table as in IANA.java

And it is done: http://github.com/wmeissner/jnr-netdb

That will try and access the native getservbyname/getservbyport functions and use them if it can. If it cannot, it will fallback to the same table as contained in IANA.java in jruby.

Its not wired in to JRuby yet, but that won't be too hard.

Fixed in commit f8f8526605de73c2162197f6422e670e2afbec65

It looks like the value is signed.

$ jruby -v -rsocket -e 'p Socket.getservbyname("blp5")'
jruby 1.5.0.dev (ruby 1.8.7 patchlevel 174) (2010-03-25 d15a53c) (Java HotSpot(TM) 64-Bit Server VM 1.6.0_17) [x86_64-java]
-17407

This value should be 48129.

That should be fixed in jnr-netdb now. You'll need to build it from source to verify that it is fixed.

Commit f8f8526605de73c2162197f6422e670e2afbec65 results in following failure when I run
'ant test' on Windows XP SP3.

C:\NBProjects\jruby>jruby -v
jruby 1.5.0.dev (ruby 1.8.7 patchlevel 174) (2010-03-26 f8f8526) (Java HotSpot(TM) Client VM 1.6.0_13) [x86-java]

run-junit-interpreted-short:
[echo] compile=OFF, jit.threshold=20, jit.maxsize=1000000000, jit.max=-1, objectspace=true threadpool=false reflection=false version=ruby1_8
[junit] Testsuite: org.jruby.test.ScriptTestSuite
[junit] EXCEPTION raised 18 –
[junit] Exception: no such service http/tcp
[junit] ./test/testSocket.rb:136
[junit] ./test/testSocket.rb:99:in `load'
[junit] ./test/minirunit.rb:99:in `test_load'
[junit] test\testSocket.rb_generated_test.rb:3)
[junit] Tests run: 56, Failures: 1, Errors: 0, Time elapsed: 5,14 sec
[junit]
[junit] Testcase: testSocket.rb(org.jruby.test.ScriptTestSuite$ScriptTest):FAILED

JIRB session with corresponding test:
C:\NBProjects\jruby>jirb
irb(main):001:0> require 'socket'
=> true
irb(main):002:0> #JRUBY-2666
irb(main):003:0* empty_host_addr_info = Socket::getaddrinfo("", "http",
irb(main):004:1* Socket::AF_INET,
irb(main):005:1* Socket::SOCK_STREAM,
irb(main):006:1* Socket::IPPROTO_TCP,
irb(main):007:1* Socket::AI_PASSIVE)
SocketError: no such service http/tcp
from (irb):4
irb(main):008:0>

Previous commit gives following result in JIRB:

=> [["AF_INET", 80, "0.0.0.0", "0.0.0.0", 4, 1, 6]]

I've committed some fixes to jnr-netdb to resolve failures on Windows and 'ant test' passes with updated jnr-netdb.jar. We just need to wait till the updated version is integrated into jruby proper.

So, Windows problem is resolved.

BUT, the issue with negative values is not yet fully fixed, I see that on Windows and Linux.

This is fixed in b4133c9.