1. Can't pipe stdout into 'cat', using g++/libg++ on SunOS 4.1
I have written a filter program, one which reads from standard
input and writes to standard output. The output works OK when
printing to the console, or when redirected via the shell to a file,
but fails when piped into the standard input of another program,
such as 'cat'.
I am running SunOS 4.1, using libg++ 2.3 (I believe). The test
program below tries to act like cat, copying its input verbatim to
the output.
#include <String.h>
int main (int argc, char ** argv, char **env)
{
String line;
// keep terminator, or cannot tell eof
while (readline(cin,line,'\n',0)) cout << line ;
}
Call the program above 'acat'. I can do the following tests:
cat foo.txt | cat - prints foo.txt
cat foo.txt | acat - prints foo.txt
cat foo.txt | acat | cat - NO output!
cat foo.txt | cat | cat - prints foo.txt
cat foo.txt | acat > bar.txt - bar.txt contains foo.txt
Other variations convince me that I cannot pipe the output of
this program into itself or any other "filter" program. What gives?
This is a very disquieting thing to have happen.
BTW, the executable for this program is 524K. Also disquieting.
-Sean
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