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standards/46150: Wrong errno from listen(2)

>Number:         46150
>Category:       standards
>Synopsis:       Wrong errno from listen(2)
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    standards-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Mar 07 07:15:00 +0000 2012
>Originator:     Jukka Ruohonen
>Release:        NetBSD 5.1_STABLE - NetBSD 6.0 BETA
Architecture: i386
Machine: i386


According to IEEE Std 1003.1-2008, if a socket is already connected,
a call to listen(2) should fail with EINVAL, like it does on Linux. But on
NetBSD the call fails with EOPNOTSUPP.

Note that while this seems (and is) a trivial issue, some third-party
software (mainly programming languages) seem to rely on correct errors from
the networking functions.

Related PRs:

        PR kern/22522: connect(2) may fail with EINVAL
        PR kern/46077: fstat() returns EINVAL


A test case will follow.


Not investigated.

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