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Subject: Re: _rdtsc(void) inline function in time.h - cause problem with 
  multiple definition during linking
Date: Mon, 31 Oct 2011 00:22:53 +0100
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On 30.10.2011 21:29, RayeR wrote:
> Just a small note to FCNTL.H:
> When I compiled a program (for limnux) using function open() it
> couldn't find
> S_IRUSR and S_IWUSR constants. They are referenced from
[...]
> so I tried to add
> #include<sys/stat.h>
> and then it compiled OK.
> Wouldn't be better to include sys/stat.h directly from FCNTL.H?

May be, but not necessarily.  The relevant specification says that 
<fcntl.h> _may_ pull in <sys/stat.h> --- but not that it has to. 
S_IRUSR and S_IWUSR actually belong into <sys/stat.h>.

So every program that wants to use these macros actually has to include 
<sys/stat.h> to be portable.  In that sense, having <fcntl.h> do it 
might do users a disservice by providing a false feel of correctness --- 
the author of that Linux code you found apparently fell into that trap 
already.