--- /dev/null
+s/^( fcntl fd=\d+ cmd=F_SETFL) 2050$/$1 O_NONBLOCK\|\.\.\./;
+if ($last =~ m/^ fcntl fd=\d+ cmd=F_GETFL$/) {
+ s/^ fcntl=2$/ fcntl\=\~O_NONBLOCK\&.../;
+}
+if ($last =~ m/^ fcntl fd=\d+ cmd=F_SETFL /) {
+ s/^ fcntl=0$/ fcntl\=OK/;
+}
+$last=$_;