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https://issues.apache.org/jira/browse/THRIFT-2460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13973935#comment-13973935
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Jin-wook Jeong commented on THRIFT-2460:
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On Windows, SOCKET is unsigned int, and INVALID_SOCKET is (~0).
So, you can use (-1) for the THRIFT_INVALID_SOCKET on Windows, as well.
(~0) is more appropriate for unsigned int, but no difference between (-1) and 
(~0), practically.

> unopened socket fd must be less than zero.
> ------------------------------------------
>
>                 Key: THRIFT-2460
>                 URL: https://issues.apache.org/jira/browse/THRIFT-2460
>             Project: Thrift
>          Issue Type: Bug
>          Components: C glib - Library
>    Affects Versions: 0.9.1
>            Reporter: Jaesang Kim
>            Assignee: Jens Geyer
>             Fix For: 0.9.2
>
>         Attachments: thrift-2460-unopened_socket_set_to_negative_integer.patch
>
>
> ThriftSocket->sd is 0 when initialized.
> But socket() function return a fd number greater than *equal* 0.
> So, ThriftSocket->sd must be less than 0 in initialize function.



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