From:	Ben Peddell <killer DOT lightspeed AT bigpond DOT com>
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Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: stat and character devices
References:	<bdbdie$im7$1 AT blue DOT rahul DOT net> <2950-Wed25Jun2003124946+0300-eliz AT elta DOT co DOT il> <ga7jfv0tk254jg05c21ran3ligd9lrc96l AT 4ax DOT com>
Lines:	220
Message-ID:	<XDjKa.1201$p8.45122@newsfeeds.bigpond.com>
Date:	Thu, 26 Jun 2003 02:08:01 +1000
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

Andrew wrote:
 >>>I noticed that stat treats some character devices differently, depending
 >>>on whether it is run in a DOS box under Win98 or in plain DOS. The COM
 >>>series (com1, com2, etc.) shows as a character device when run under
 >>>plain DOS, but not in the DOS box under Win98.
 >>
 >>On my Windows 98 box, "ls -l com2" shows "com2" in yellow, which means
 >>`stat' did return the character-device bit set for it.  So I guess I
 >>cannot reproduce this here.
 >>
 >>
 >>>A test program that demonstrates this follows.
 >>
 >>You didn't show the results of running this program on Windows 98.
 >>Here are mine:
 >>
 >>   The value of base is com1
 >>   The value of st_dev is -1.
 >>   The value of st_mode is 8612.
 >>   The file is a character device.
 >>
 >>Exactly as I'd expect.
 >>
 >>So I guess more digging is required.
 >
 > Could the differences be caused by the 2.03 v's 2.04 alpha 1
 > differences?
 >
 > Andrew

I tested it. It doesn't like long file names in the path.
Here's the script I ran with bash:


===== [Start of file 'testdev.sh'] =====
#!/bin/bash
#

devs='con aux prn clock$ com1 com2 com3 com4 lpt1 lpt2 lpt3 config$ 
xmsxxxx0 $mmxxxx0 setverxx ifs$hlp$ mscd001 dblsysh$'
echo Devices are:
echo
ls $devs
echo
echo

cd /
echo DJGPP CWD=`pwd`
echo Windows CWD=`/command.com /c cd`
ls -l $devs
echo
echo

cd "Program Files"
echo DJGPP CWD=`pwd`
echo Windows CWD=`/command.com /c cd`
ls -l $devs
echo
echo

cd ../progra~1
echo DJGPP CWD=`pwd`
echo Windows CWD=`/command.com /c cd`
ls -l $devs
echo
echo

cd bochs-2.0.2
echo DJGPP CWD=`pwd`
echo Windows CWD=`/command.com /c cd`
ls -l $devs
echo
echo

cd ../bochs-~1.2
echo DJGPP CWD=`pwd`
echo Windows CWD=`/command.com /c cd`
ls -l $devs
===== [End of file 'testdev.sh'] =====


And here's the output from running 'testdev.sh >testdev.txt 2>&1' under 
bash.

===== [Start of file 'testdev.txt'] =====
Devices are:

$mmxxxx0
aux
clock$
com1
com2
com3
com4
con
config$
dblsysh$
ifs$hlp$
lpt1
lpt2
lpt3
mscd001
prn
setverxx
xmsxxxx0


DJGPP CWD=c:/
Windows CWD=C:\
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 $mmxxxx0
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 aux
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 clock$
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 com1
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 com2
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 com3
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 com4
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 con
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 config$
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 dblsysh$
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 ifs$hlp$
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 lpt1
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 lpt2
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 lpt3
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 mscd001
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 prn 

crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 setverxx 

crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 xmsxxxx0


DJGPP CWD=c:/Program Files
Windows CWD=C:\Program Files
ls: com1: No such file or directory (ENOENT)
ls: com2: No such file or directory (ENOENT)
ls: com3: No such file or directory (ENOENT)
ls: com4: No such file or directory (ENOENT)
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 $mmxxxx0
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 aux
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 clock$
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 con
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 config$
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 dblsysh$
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 ifs$hlp$
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 lpt1
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 lpt2
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 lpt3
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 mscd001
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 prn
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 setverxx
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 xmsxxxx0


DJGPP CWD=c:/progra~1
Windows CWD=C:\Program Files
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 $mmxxxx0
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 aux
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 clock$
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 com1
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 com2
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 com3
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 com4
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 con
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 config$
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 dblsysh$
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 ifs$hlp$
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 lpt1
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 lpt2
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 lpt3
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 mscd001
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 prn
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 setverxx
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 xmsxxxx0


DJGPP CWD=c:/progra~1/bochs-2.0.2
Windows CWD=C:\Program Files\bochs-2.0.2
ls: com1: No such file or directory (ENOENT)
ls: com2: No such file or directory (ENOENT)
ls: com3: No such file or directory (ENOENT)
ls: com4: No such file or directory (ENOENT)
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 $mmxxxx0
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 aux
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 clock$
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 con
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 config$
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 dblsysh$
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 ifs$hlp$
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 lpt1
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 lpt2
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 lpt3
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 mscd001
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 prn
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 setverxx
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 xmsxxxx0


DJGPP CWD=c:/progra~1/bochs-~1.2
Windows CWD=C:\Program Files\bochs-2.0.2
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 $mmxxxx0
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 aux
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 clock$
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 com1
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 com2
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 com3
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 com4
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 con
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 config$
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 dblsysh$
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 ifs$hlp$
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 lpt1
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 lpt2
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 lpt3
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 mscd001
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 prn
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 setverxx
crw-r--r--    1 dosuser  dos        0,   0 Jun 26 01:51 xmsxxxx0
===== [End of file 'testdev.txt'] =====

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