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diff --git a/contrib/ee/ee.c b/contrib/ee/ee.c
--- a/contrib/ee/ee.c
+++ b/contrib/ee/ee.c
@@ -554,6 +554,13 @@
for (counter = 1; counter < 24; counter++)
signal(counter, SIG_IGN);
+ /* Always read from (and write to) a terminal. */
+ if (!isatty(STDIN_FILENO) || !isatty(STDOUT_FILENO)) {
+ fprintf(stderr,
+ "ee's standard input and output must be a terminal\n");
+ exit(1);
+ }
+
signal(SIGCHLD, SIG_DFL);
signal(SIGSEGV, SIG_DFL);
signal(SIGINT, edit_abort);

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