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Re: [lwip-users] Dealloc in fs_close_custom()?

From: address@hidden
Subject: Re: [lwip-users] Dealloc in fs_close_custom()?
Date: Mon, 26 Feb 2018 19:45:06 +0100
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0

On 26.02.2018 16:51, Giuseppe Modugno wrote:
I read the examples in lwip-contrib, mainly genfiles_example.c. The
dynamic memory allocated for the file content is freed in
fs_close_custom(). However I couldn't explain why.

Indeed, mostly if the content is small, it is completely sent in

tcp_write() is called in http_write() without TCP_WRITE_FLAG_COPY, at
least it seems so to me.

That's not fully correct. The default behaviour is that data is copied for dynamic files (where buf != NULL). This should cover SSI files as well as custom files, but it could be that it doesn't cover your setup of custom files.

You either can adjust the macro HTTP_IS_DATA_VOLATILE() in that case, or come up with a patch that would keep the file open until everything is ACKed.


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