Mail Archives: djgpp/2013/01/14/23:30:31
X-Authentication-Warning: | delorie.com: mail set sender to djgpp-bounces using -f
|
From: | Nick Bowler <nbowler AT draconx DOT ca>
|
Newsgroups: | comp.os.msdos.djgpp
|
Subject: | Reading /dev/null seems broken.
|
Date: | Tue, 15 Jan 2013 04:18:07 +0000 (UTC)
|
Organization: | A noiseless patient Spider
|
Lines: | 40
|
Message-ID: | <kd2l9v$41s$1@dont-email.me>
|
Mime-Version: | 1.0
|
Injection-Date: | Tue, 15 Jan 2013 04:18:07 +0000 (UTC)
|
Injection-Info: | mx04.eternal-september.org; posting-host="fc3f734a965da4e0c71f7fb34316daf1";
|
| logging-data="4156"; mail-complaints-to="abuse AT eternal-september DOT org"; posting-account="U2FsdGVkX1/hNVsIqA6yAF3JdLoJAjXb"
|
User-Agent: | Pan/0.139 (Sexual Chocolate; GIT bf56508
|
| git://git.gnome.org/pan2)
|
Cancel-Lock: | sha1:yl37JZqqSkUMdTVwRgd2QHDHedk=
|
Bytes: | 2554
|
To: | djgpp AT delorie DOT com
|
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp
|
Reply-To: | djgpp AT delorie DOT com
|
Hi folks,
I've been playing around with DJGPP in dosemu, trying to build one of my
own C projects using the GNU build system (autoconf, automake, etc.) I
installed the latest versions from the "current" directory on the DJGPP
FTP site.
After some minor configuration struggles, the configure script mostly
worked, until it came time to run config.status (a shell script which gets
generated and run by the main configure script). At this point, the entire
system would (apparently) lock up. I tracked this down to one line in the
script which reads from /dev/null, which looks like this:
if sed "s/$ac_cr//" < /dev/null > /dev/null 2>&1; then
Sure enough, the lockup can easily be reproduced from the DJGPP bash
prompt with a similar command:
sed 's/x//' < /dev/null > /dev/null
which hangs in the same way. If I omit the >/dev/null redirection, then
endless garbage data is spewed to the console instead of the expected
nothing at all.
On a "real" POSIX-y system, this should exit with success since reading
from /dev/null will always return 0 (EOF). I replaced the entire test
with a simple "true" in the config.status script, and things ran fine.
Another instance came up later during the build, with a command similar
to:
cat /dev/null > file
This is expected to produce an empty output file, but instead, gigabytes
of garbage are written. Seems to be pretty much the same root problem.
While in this case I can work around these problems, should DJGPP be
presenting a /dev/null that works properly?
Cheers,
Nick
- Raw text -