Bug#696283: jruby: Sets FD_CLOEXEC incorrectly with F_SETFL instead of F_SETFD

[Guillem Jover]

Source: jruby
Version: 1.5.6-5
Severity: important
Tags: patch
User: debian-bsd at lists.debian.org
Usertags: fcntl-fd-cloexec

Hi!

This package contains code that tries to set the FD_CLOEXEC flag for a
file descriptor, but it does using F_SETFL instead of F_SETFD.

Using that value on F_SETFL is just wrong, and might make the call fail
on some systems, as it's requesting to set an undetermined flag. For
example on GNU/* FD_CLOEXEC has value 1, which matches with O_WRONLY.

This might cause the code to at least leak file descriptors, and at
worst to terminate execution.

Attached a patch fixing this. (I've filed bug reports for the ruby 1.8
and 1.9.1 parts on their relative packages too.)

Thanks,
Guillem
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