assert

来自「实战Linux编程的原代码,希望对学驱动的人能有所帮助」· 代码 · 共 50 行

#!/bin/sh
# This test fails with tail from textutils-2.0.
# It would get something like this:
#   tail: tail.c:718: recheck: Assertion `valid_file_spec (f)' failed.
#   Aborted
# due to a race condition in which a dev/inode pair is reused.

if test "$VERBOSE" = yes; then
  set -x
  tail --version
fi

tmp=tail-assert.$$
pwd=`pwd`
trap "cd $pwd; rm -rf $tmp" 0 1 2 3 15

test_failure=0
mkdir $tmp || test_failure=1
cd $tmp || test_failure=1

if test $test_failure = 1; then
  echo 'failure in testing framework'
  exit 1
fi

ok='ok ok ok'

touch a foo
tail --follow=name a foo > err 2>&1 &
tail_pid=$!
# Arrange for the tail process to die after 12 seconds.
(sleep 12; kill $tail_pid) &
rm -f foo
echo sleeping for 7 seconds...
sleep 7
echo $ok > f
mv f foo

# echo waiting....
wait

case "`cat err`" in
  *$ok) fail=0;;
  *) fail=1;;
esac

test $fail = 1 && cat err

exit $fail