1 files changed, 85 insertions, 0 deletions
diff --git a/tests/tail-2/follow-stdin.sh b/tests/tail-2/follow-stdin.sh
new file mode 100755
index 0000000..f3ad9b5
--- /dev/null
+++ b/tests/tail-2/follow-stdin.sh
@@ -0,0 +1,85 @@
+#!/bin/sh
+# Test tail -f -
+
+# Copyright (C) 2009-2020 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ tail
+
+#################
+# tail -f - would fail with the initial inotify implementation
+
+check_tail_output()
+{
+  local delay="$1"
+  grep "$tail_re" out ||
+    { sleep $delay; return 1; }
+}
+
+# Terminate any background tail process
+cleanup_() { kill $pid 2>/dev/null && wait $pid; }
+
+# Speedup the non inotify case
+fastpoll='-s.1 --max-unchanged-stats=1'
+
+echo line > in || framework_failure_
+echo line > exp || framework_failure_
+
+for mode in '' '---disable-inotify'; do
+  > out || framework_failure_
+
+  tail $mode -f $fastpoll < in > out 2> err & pid=$!
+
+  # Wait up to 12.7s for output to appear:
+  tail_re='line' retry_delay_ check_tail_output .1 7 ||
+    { echo "$0: a: unexpected delay?"; cat out; fail=1; }
+
+  # Ensure there was no error output.
+  compare /dev/null err || fail=1
+
+  cleanup_
+done
+
+
+#################
+# Before coreutils-8.26 this would induce an UMR under UBSAN
+returns_ 1 timeout 10 tail -f - <&- 2>errt || fail=1
+cat <<\EOF >exp || framework_failure_
+tail: cannot fstat 'standard input'
+tail: error reading 'standard input'
+tail: no files remaining
+tail: -
+EOF
+sed 's/\(tail:.*\):.*/\1/' errt > err || framework_failure_
+compare exp err || fail=1
+
+
+#################
+# Before coreutils-8.28 this would erroneously issue a warning
+if tty -s </dev/tty && test -t 0; then
+  for input in '' '-' '/dev/tty'; do
+    returns_ 124 timeout 0.1 tail -f $input 2>err || fail=1
+    compare /dev/null err || fail=1
+  done
+
+  tail -f - /dev/null </dev/tty 2> out & pid=$!
+  # Wait up to 12.7s for output to appear:
+  tail_re='ineffective' retry_delay_ check_tail_output .1 7 ||
+    { cat out; fail=1; }
+  cleanup_
+fi
+
+Exit $fail