Date: Wed, 7 Dec 2005 00:04:20 EST-10EDT,10,-1,0,7200,3,-1,0,7200,3600
Subject: [UnixOS2_Archive] No. 662

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Tuesday 06 December 2005
 Number  662
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Subjects for today
 
1   ncurses v5.5 : John Poltorak <jp at warpix.org>
2  Re:  DosLoadModule problem : Holger Veit <holger.veit at ais.fraunhofer.de>


**= Email   1 ==========================**

Date:  Tue, 6 Dec 2005 09:34:57 +0000
From:  John Poltorak <jp at warpix.org>
Subject:   ncurses v5.5


Ncurses 5.5 has been released recently, but I've found I am unable to 
build it with my standard build environment. The following errors are 
produced

In file included from ../ncurses/./tty/tty_update.c:70:
g:\ux2bs\posix2\include\sys/select.h:26: `NBBY' undeclared here (not in a 
function)
g:\ux2bs\posix2\include\sys/select.h:26: `NBBY' undeclared here (not in a 
function)
g:\ux2bs\posix2\include\sys/select.h:26: size of array `fds_bits' has 
non-integer type
g:\ux2bs\posix2\include\sys/select.h:43: conflicting types for `_select'
g:\ux2bs\posix2\include\sys/unistdx.h:149: previous declaration of 
`_select'
make[1]: *** [../objects/tty_update.o] Error 1
make[1]: Leaving directory `/ux2bs/workdir/ncurses-5.5/ncurses'
make: *** [all] Error 2



In file included from ../ncurses/./tty/tty_update.c:70:
g:\ux2bs\posix2\include\sys/select.h:26: `NBBY' undeclared here (not in a 
function)
g:\ux2bs\posix2\include\sys/select.h:26: `NBBY' undeclared here (not in a 
function)
g:\ux2bs\posix2\include\sys/select.h:26: size of array `fds_bits' has 
non-integer type
g:\ux2bs\posix2\include\sys/select.h:43: conflicting types for `_select'
g:\ux2bs\posix2\include\sys/unistdx.h:149: previous declaration of 
`_select'
make[1]: *** [../objects/tty_update.o] Error 1


I suspect that this may have something to do with Posix/2. Can anyone 
confirm that?

-- 
John



**= Email   2 ==========================**

Date:  Tue, 06 Dec 2005 12:09:46 +0100
From:  Holger Veit <holger.veit at ais.fraunhofer.de>
Subject:  Re:  DosLoadModule problem

Dave Yeo wrote:

>On Sat, 03 Dec 2005 22:21:05 +1030, Paul Smedley wrote:
>
>  
>
>>I'm currently grappling with loading Apache2 modules dynamically.
>>    
>>
>
>Wonder how hard it would be to change over to loading ELF modules? This is the way XFree86 dynamicaly loads modules
>Dave
>  
>
You could look at the source code of the X server to see how this is 
done :-) It can also handle COFF and a.out files, BTW.
The point with this method is that the X server is a specifically 
tailored environment to load and dynamically link predefined entry 
points only.
This also means that it does not understand all fields of an ELF file, 
but only those which are required to keep a module alive. The X server 
also contains its own special libc for resolving module libc entries - 
the native libc might have different calling conventions.
 Loading such an ELF module is rather simple in principle: malloc enough 
space, fixup links according to a predefined entry table and add the new 
entry points introduced by the module to the table. This could work with 
Apache as well, but you need to know in advance which entry points a 
module requires. Regular ELF exports any symbol which is not 
specifically static - for these special modules you need to define 
everything first.

Holger