Mail Archives: cygwin/2006/03/30/13:39:56
Hi all:
First, I found another gentleman with a similar issue in the mailing
list archive:
http://www.cygwin.com/ml/cygwin/2006-03/msg00425.html
Seems he thought the problem wasn't with gawk 3.1.5-3 in the end,
however I'm having very similar issues with gawk hanging and it only
happens with 3.1.5-3. When I revert to 3.1.5-2, the problem seems to go
away.
Unfortunately, the issue is intermittent and only seems to occur when i
call gawk from the bowels of my fairly long bash script. When I try to
isolate the problem by running the same gawk script manually from a
prompt, the problem disappears. Perhaps this is related to why the other
poster became convinced the problem wasn't actually with gawk, when in
fact it the problem was with gawk, but hard to pin down.
The gawk script in question is very simple and is meant to reduce the
output from an rsync transfer. Here's a snippet:
rsync -vP sourcefile remotesys:~/remotefile | gawk \
'
BEGIN {
RS="\r|\n";
FS=" ";
}
{
if ( $2 ~ /\%/ ) { # if field 2 contains a percent sign
if ( FNR % 10 == 0 || $5 ~/\(/ ) {
# if its the tenth line, or field 5 contains a "("
print $0;
fflush();
}
} else {
print $0;
fflush();
}
}
'
Again, if I run this command from a prompt, it works (with 3.1.5-3 and
3.1.5-2). But when called from the bowels of a longer shell script (not
included for brevity), it usually (but not always) hangs with 3.1.5-3. I
can verify the rsync transfer finishes properly, but gawk never exits
and I don't get all the output that I should to stdout, either. I don't
see anything going to stderr. Again, it works 100% of the time with 3.1.5-2
Does anyone have some pointers on how I can further debug this? I'd like
to forward more information to the appropriate parties.
Regards;
David Carter
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