misc

实战Linux编程的原代码,希望对学驱动的人能有所帮助

#!/bin/sh

tmp_in=dd-in.$$
tmp_out=dd-out.$$

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

test_failure=0
echo data > $tmp_in || test_failure=1
if test $test_failure = 1; then
  echo 'failure in testing framework'
  exit 1
fi

dd if=$tmp_in of=$tmp_out > /dev/null 2>&1 || fail=1
cmp $tmp_in $tmp_out || fail=1

rm -f $tmp_in $tmp_out

exit $fail