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-rwxr-xr-xtests/tail-2/tail-n0f.sh55
1 files changed, 55 insertions, 0 deletions
diff --git a/tests/tail-2/tail-n0f.sh b/tests/tail-2/tail-n0f.sh
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index 000000000..2b2147a7f
--- /dev/null
+++ b/tests/tail-2/tail-n0f.sh
@@ -0,0 +1,55 @@
+#!/bin/sh
+# Make sure that 'tail -n0 -f' and 'tail -c0 -f' sleep
+# rather than doing what amounted to a busy-wait.
+
+# Copyright (C) 2003-2012 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 <http://www.gnu.org/licenses/>.
+
+# This bug was fixed for 5.0.91
+# It skips the test if your system lacks a /proc/$pid/status
+# file, or if its contents don't look right.
+
+. "${srcdir=.}/init.sh"; path_prepend_ ../src
+print_ver_ tail
+
+require_proc_pid_status_
+
+touch empty || framework_failure_
+echo anything > nonempty || framework_failure_
+
+
+for inotify in ---disable-inotify ''; do
+ for file in empty nonempty; do
+ for c_or_n in c n; do
+ tail --sleep=4 -${c_or_n} 0 -f $inotify $file &
+ pid=$!
+ tail_sleeping()
+ {
+ local delay="$1"; sleep $delay
+ state=$(get_process_status_ $pid)
+ case $state in
+ S*) ;;
+ *) return 1;;
+ esac
+ }
+ # Wait up to 1.5s for tail to sleep
+ retry_delay_ tail_sleeping .1 4 ||
+ { echo $0: process in unexpected state: $state >&2; fail=1; }
+ kill $pid
+ done
+ done
+done
+
+Exit $fail