diff options
Diffstat (limited to 'tests/tail-2/tail-n0f')
-rwxr-xr-x | tests/tail-2/tail-n0f | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/tests/tail-2/tail-n0f b/tests/tail-2/tail-n0f new file mode 100755 index 0000000..298fca4 --- /dev/null +++ b/tests/tail-2/tail-n0f @@ -0,0 +1,76 @@ +#!/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, 2006 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 2 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, write to the Free Software +# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +# 02110-1301, USA. + + +# 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 |