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cygwin 1.5.20-1 problem writing to stdout
- From: "Nellis, Kenneth" <knellis at idirect dot net>
- To: <cygwin at cygwin dot com>
- Date: Thu, 6 Jul 2006 11:30:44 -0400
- Subject: cygwin 1.5.20-1 problem writing to stdout
A program, which Iâve had for years and which has worked on many
different Unix variants, stopped working when I upgraded to cygwin
1.5.20-1. When I back-installed 1.5.19-4, it resumed working.
Actually, the program functioned fine, but output to stdout was
stifled. I was able to reduce the program to the following few lines,
which exhibit the problem:
=========== xyz.c ================
#include <stdio.h>
static char b[4001];
static char *whoami;
int main (int argc, char *argv[])
{
puts ("hello");
return 0;
}
==================================
(The unreferenced variables are indeed referenced in the larger
program and are required for this smaller program to exhibit the
problem.)
I compiled with gcc (3.4.4-1) as follows: gcc xyz.c -o xyz
When run under 1.5.19-4, it works as expected, writing "hello" to
stdout.
However, when run under 1.5.20-1, it does not output anything, but
otherwise returns normally.
The problem is unrelated to terminal I/O because output is stifled
even when stdout is redirected to a file.
Removing either the b or whoami variables or reducing 4001 to 4000
allows the program to work again.
I'd like to hear if anyone else can reproduce this problem.
Below, I copy my "cygcheck -s" output with my cygwin 1.5.19-4
installation. The only change to this to get the program to fail is
updating cygwin to 1.5.20-1.
--Ken Nellis
====================== cygcheck -s ========================
Cygwin Package Information
Package Version Status
_update-info-dir 00403-1 OK
alternatives 1.3.20a-2 OK
ash 20040127-3 OK
base-files 3.7-1 OK
base-passwd 2.2-1 OK
bash 3.1-6 OK
binutils 20050610-1 OK
bzip2 1.0.3-1 OK
ccrypt 1.7-1 OK
clear 1.0-2 OK
compface 1.5.2-1 OK
coreutils 5.94-1 OK
crypt 1.1-1 OK
ctags 5.6-1 OK
curl 7.15.4-1 OK
cvs 1.11.17-1 OK
cygrunsrv 1.17-1 OK
cygutils 1.3.0-1 OK
cygwin 1.5.19-4 OK
cygwin-doc 1.4-3 OK
diffutils 2.8.7-1 OK
e2fsprogs 1.35-3 OK
ed 0.2-1 OK
editrights 1.01-1 OK
emacs 21.2-13 OK
enscript 1.6.4-1 OK
expat 1.95.8-1 OK
expect 20030128-1 OK
file 4.16-1 OK
findutils 4.2.27-1 OK
fontconfig 2.2.2-1 OK
freetype2 2.1.9-1 OK
gawk 3.1.5-4 OK
gcc-core 3.4.4-1 OK
gcc-g++ 3.4.4-1 OK
gcc-mingw-core 20050522-1 OK
gcc-mingw-g++ 20050522-1 OK
gdbm 1.8.3-7 OK
gettext 0.14.5-1 OK
ghostscript 8.50-1 OK
ghostscript-base 8.50-1 OK
ghostscript-x11 8.50-1 OK
gmp 4.1.4-2 OK
grep 2.5.1a-2 OK
groff 1.18.1-2 OK
guile 1.6.7-4 OK
guile-devel 1.6.7-4 OK
guile-doc 1.6.7-4 OK
gzip 1.3.5-2 OK
ioperm 0.4-1 OK
jbigkit 1.5-3 OK
less 381-1 OK
lesstif 0.93.94-2 OK
libbz2_1 1.0.3-1 OK
libcharset1 1.9.2-2 OK
libcurl3 7.15.4-1 OK
libdb4.2 4.2.52-1 OK
libdb4.3 4.3.28-1 OK
libfontconfig1 2.2.2-1 OK
libfreetype26 2.1.9-1 OK
libgdbm 1.8.0-5 OK
libgdbm-devel 1.8.3-7 OK
libgdbm3 1.8.3-3 OK
libgdbm4 1.8.3-7 OK
libguile12 1.6.7-4 OK
libguile16 1.7.2-3 OK
libiconv 1.9.2-2 OK
libiconv2 1.9.2-2 OK
libintl 0.10.38-3 OK
libintl1 0.10.40-1 OK
libintl2 0.12.1-3 OK
libintl3 0.14.5-1 OK
libjpeg62 6b-11 OK
libkpathsea3 2.0.2-15 OK
libkpathsea4 3.0.0-3 OK
libncurses5 5.2-1 OK
libncurses6 5.2-8 OK
libncurses7 5.3-4 OK
libncurses8 5.5-2 OK
libnetpbm10 10.30-1 OK
libopenldap2_2_7 2.2.26-2 OK
libpcre0 6.3-1 OK
libpng 1.2.8-2 OK
libpng12 1.2.8-2 OK
libpopt0 1.6.4-4 OK
libreadline4 4.1-2 OK
libreadline5 4.3-5 OK
libreadline6 5.1-5 OK
libsasl2 2.1.19-3 OK
libtiff4 3.6.0-5 OK
libtiff5 3.7.3-1 OK
libXft 2.1.6-1 OK
libXft1 1.0.0-1 OK
libXft2 2.1.6-1 OK
login 1.9-7 OK
make 3.80-1 OK
man 1.5p-1 OK
mingw-runtime 3.10-1 OK
minires 1.00-1 OK
mktemp 1.5-3 OK
ncurses 5.5-2 OK
netpbm 10.30-1 OK
openssh 4.3p2-3 OK
openssl 0.9.8b-1 OK
openssl097 0.9.7j-1 OK
patch 2.5.8-8 OK
pcre 6.3-1 OK
pcre-devel 6.3-1 OK
pcre-doc 6.3-1 OK
perl 5.8.7-5 OK
ping 1.0-1 OK
postgresql 8.0.7-1 OK
psmisc 21.5-2 OK
rsync 2.6.6-1 OK
run 1.1.10-1 OK
rxvt 20050409-3 OK
sed 4.1.5-1 OK
tar 1.15.1-4 OK
tcltk 20030901-1 OK
termcap 20050421-1 OK
terminfo 5.5_20060323-1 OK
tetex-base 3.0.0-3 OK
tetex-bin 3.0.0-3 OK
tetex-devel 3.0.0-3 OK
tetex-extra 3.0.0-3 OK
texinfo 4.8-3 OK
time 1.7-1 OK
transfig 3.2.4-2 OK
tzcode 2005r-2 OK
util-linux 2.12r-2 OK
vim 7.0.035-1 OK
w32api 3.7-1 OK
which 1.7-1 OK
X-startup-scripts 1.0.11-1 OK
Xaw3d 1.5D-5 OK
xemacs 21.4.19-1 OK
xorg-x11-base 6.8.2.0-1 OK
xorg-x11-bin 6.8.2.0-1 OK
xorg-x11-bin-dlls 6.8.2.0-1 OK
xorg-x11-bin-lndir 6.8.2.0-1 OK
xorg-x11-etc 6.8.2.0-1 OK
xorg-x11-fenc 6.8.1.0-2 OK
xorg-x11-fnts 6.8.1.0-3 OK
xorg-x11-libs-data 6.8.2.0-1 OK
xorg-x11-xwin 6.8.2.0-4 OK
xterm 202-1 OK
zlib 1.2.3-1 OK
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