[SAtalk] Is spamc unbuffered?

[Mark]

In Perl, I use an Open2 call to a process which calls spamc, write data to it, and collect the result. Like so:   use FileHandle; use IPC::Open2;   $pid = open2 (*READER, *WRITER, "/usr/local/sa/bin/spamc -f -d 127.0.0.1 -u test"); print WRITER $text; close (WRITER); $body .= $_ while (<READER>); close (READER);   This works flawlessly on not all that large files; but when I tried it on a file over 1M, the whole process hangs at "print WRITER $text;". I know the docs talk about unix buffering and all, but I thought the output of spamc is supposed to be unbuffered?   Does anyone have any idea why it would hang altogether?   Thanks,   - Mark