mirror of
https://github.com/coreutils/coreutils.git
synced 2024-12-23 08:46:59 +08:00
55 lines
1.4 KiB
Bash
Executable File
55 lines
1.4 KiB
Bash
Executable File
#!/bin/sh
|
|
# Demonstrate a bug in `tail -cN' when operating on files of size 4G and larger
|
|
# Fixed in coreutils-4.5.2.
|
|
|
|
. $srcdir/../expensive
|
|
|
|
if test "$VERBOSE" = yes; then
|
|
set -x
|
|
tail --version
|
|
fi
|
|
|
|
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 $tmp || framework_failure=1
|
|
|
|
# Create a file of size exactly 4GB (2^32) with 8 bytes
|
|
# at the beginning and another set of 8 bytes at the end.
|
|
# The rest will be NUL bytes. On most modern systems, the following
|
|
# creates a file that takes up only a few KB. Here, du -sh says 16K.
|
|
echo abcdefgh | tr -d '\n' > big || framework_failure=1
|
|
echo 87654321 | tr -d '\n' > tmp || framework_failure=1
|
|
# Seek 4GB - 8
|
|
dd bs=1 seek=4294967288 if=tmp of=big 2> err || dd_failed=1
|
|
if test "$dd_failed" = 1; then
|
|
cat err 1>&2
|
|
echo "$0: cannot create a file large enough for this test," 1>&2
|
|
echo "$0: possibly because this system doesn't support large files;" 1>&2
|
|
echo "$0: Consider rerunning this test on a different file system." 1>&2
|
|
(exit 77); exit 77
|
|
fi
|
|
|
|
if test $framework_failure = 1; then
|
|
echo "$0: failure in testing framework" 1>&2
|
|
(exit 1); exit 1
|
|
fi
|
|
|
|
fail=0
|
|
|
|
tail -c1 big > out || fail=1
|
|
# Append a newline.
|
|
echo >> out
|
|
cat <<\EOF > exp
|
|
1
|
|
EOF
|
|
|
|
cmp out exp || fail=1
|
|
test $fail = 1 && diff out exp 2> /dev/null
|
|
|
|
(exit $fail); exit $fail
|