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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.
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