Bit pattern of S_IFREG (was Re: What is wrong with this code ?)

[Martin Weitzel]

In article <2722 at auspex.UUCP> guy at auspex.auspex.com (Guy Harris) writes:
[many lines deleted, because not relevant to my question]
>
>	#define	S_IFMT	0170000		/* type of file */
>	#define		S_IFDIR	0040000	/* directory */
>	#define		S_IFCHR	0020000	/* character special */
>	#define		S_IFBLK	0060000	/* block special */
>	#define		S_IFREG	0100000	/* regular */

I think I have seen on some older systems, that for regular files
you must test for both	(st_mode & S_IFMT) == S_IFREG
and *additionally*	(st_mode & S_IFMT) == 0.

I don't know if this is still true today.
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