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Date:	Thu, 2 May 2002 12:02:59 +0200 (CEST)
From:	Joerg Schilling <schilling AT fokus DOT gmd DOT de>
Message-Id:	<200205021002.g42A2xOP016077@burner.fokus.gmd.de>
To:	cygwin-developers AT cygwin DOT com, jason AT tishler DOT net
Subject:	Re: Should sys/types.h include sys/sysmacros.h?

>From: Jason Tishler <jason AT tishler DOT net>

>In the process of trying to build the latest Python CVS, I get a link
>error due to the following line:

>    res = mknod(filename, mode, makedev(major, minor));

>After building successfully under Linux, I determined that the above
>works because Linux's sys/types.h includes sys/sysmacros.h.

>Should newlib's sys/types.h include sys/sysmacros.h (possibly only for
>Cygwin)?

>I tried searching:

>    http://www.opengroup.org/onlinepubs/007908799/index.html

>but came up empty.

First, SUSv2 is outdated by POSIX.1-2001 (aka. SUSv3 / The Open Group Base Specifications Issue 6)

For curiosity: although major/minor numbers are mentioned in the standard
for the ustar/pax archive format, it seems that anything bejond the granularity
of a dev_t (like st_rdev) is bejond the scope of the standard.

In addition: I am not sure where sysmacros.h comes from, but here is a quote
from one of my portability files:

/*
 * On generic SVR4, major is a function (defined in sys/mkdev.h).
 * On Solaris it is defined ...
 * As we cannot just test if major is #define'd, we have to 
 * define _FOUND_MAJOR_ instead.
 *
 * WARNING: Do never include <sys/sysmacros.h> in SVR4, it contains
 * an old definition for major()/minor() defining 8 minorbits.
 * Use <sys/mkdev.h> instead.
 */



Jörg

 EMail:joerg AT schily DOT isdn DOT cs DOT tu-berlin DOT de (home) Jörg Schilling D-13353 Berlin
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       schilling AT fokus DOT gmd DOT de		(work) chars I am J"org Schilling
 URL:  http://www.fokus.gmd.de/usr/schilling   ftp://ftp.fokus.gmd.de/pub/unix

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