Re: md5.h

• Subject: Re: md5.h
• From: Kenneth Hill <email@hidden>
• Date: Fri, 27 Feb 2004 09:39:45 -0600

On Thursday, February 26, 2004, at 07:09 AM, email@hidden wrote:

Justin,

Thanks for responding.

On Feb 25, 2004, at 10:00 PM, email@hidden wrote:

[snip]

You are missing the realization that you should not be using headers
from /usr/include/sys in user-level code (with a few exceptions that
are *very* system-specific). If the identifiers are declared in a
<sys/...> header, they will generally be declared and instantiated in
the kernel, and your code can't user them.

After I posted the above question, I found /usr/include/openssl/md5.h, which -- lo and behold -- did not include the MD5File() prototype. So, I downloaded the text_cmds project from Darwin 7, found how it calculated the MD5 sum for a file, and followed its' example. My question now is simply: Why is /usr/include/sys/md5.h even there? No lib on my 10.3.2 box exports the MD5File() function, and from your response, I shouldn't even be using this include file.

The answer is simply that code within the kernel needs it.

You should definitely not include code from the <sys/> directory unless you *know* you need it, and that will rarely happen.

Regards,

Justin

--
Justin C. Walker, Curmudgeon-At-Large *
Institute for General Semantics | If you're not confused,
| You're not paying attention
*-------------------------------------- *-------------------------------*
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