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#!/bin/sh
# Make sure that `tail -n0 -f' and `tail -c0 -f' sleep
# rather than doing what amounted to a busy-wait.
# This bug was fixed for 5.0.91
# It skips the test if your system lacks a /proc/$pid/status
# file, or if its contents don't look right.
if test "$VERBOSE" = yes; then
set -x
tail --version
fi
sleep 2 &
pid=$!
sleep .5
grep '^State:[ ]*[S]' /proc/$pid/status > /dev/null 2>&1 || \
{
echo "$0:/proc/$pid/status: missing or 'different': skipping this test" 1>&2
(exit 77); exit 77
}
kill $pid
pwd=`pwd`
t0=`echo "$0"|sed 's,.*/,,'`.tmp; tmp=$t0/$$
trap 'status=$?; cd $pwd; chmod -R u+rwx $t0; rm -rf $t0 && exit $status' 0
trap '(exit $?); exit $?' 1 2 13 15
framework_failure=0
mkdir -p $tmp || framework_failure=1
cd $tmp || framework_failure=1
touch empty || framework_failure=1
echo anything > nonempty || framework_failure=1
if test $framework_failure = 1; then
echo "$0: failure in testing framework" 1>&2
(exit 1); exit 1
fi
fail=0
for file in empty nonempty; do
for c_or_n in c n; do
tail --sleep=4 -${c_or_n} 0 -f $file &
pid=$!
sleep .5
set _ `sed -n '/^State:[ ]*\([^ ]\)/s//\1/p' /proc/$pid/status`
shift # Remove the leading `_'.
state=$1
case $state in
S*) ;;
*) echo $0: process in unexpected state: $state 1>&2; fail=1 ;;
esac
kill $pid
done
done
(exit $fail); exit $fail
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