Major restructuring to switch build system from old scripts to GNU Automake.

tests/Modifiers_-_--direct-io.test

@@ -0,0 +1,55 @@
+#!/bin/sh
+#
+# Transfer a large chunk of data with "--direct-io" and check data
+# correctness afterwards, both with and without rate limits.  Note that this
+# doesn't check that O_DIRECT is actually being used, it just checks that
+# data is not being corrupted.
+
+# Dummy assignments for "shellcheck".
+testSubject="${testSubject:-false}"; workFile1="${workFile1:-.tmp1}"; workFile2="${workFile2:-.tmp2}"
+
+# generate some data
+dd if=/dev/urandom of="${workFile1}" bs=1024 count=2560 2>/dev/null
+
+inputChecksum=$(cksum "${workFile1}" | awk '{print $1}')
+doubleInputChecksum=$(cat "${workFile1}" "${workFile1}" | cksum - | awk '{print $1}')
+
+# read through pv and test afterwards
+"${testSubject}" -q "${workFile1}" > "${workFile2}"
+outputChecksum=$(cksum "${workFile2}" | awk '{print $1}')
+
+if ! test "${inputChecksum}" = "${outputChecksum}"; then
+	echo "checksum mismatched even without \"--direct-io\""
+	exit 1
+fi
+
+# Same again but with "--direct-io"
+
+"${testSubject}" -K -q "${workFile1}" > "${workFile2}"
+outputChecksum=$(cksum "${workFile2}" | awk '{print $1}')
+if ! test "${inputChecksum}" = "${outputChecksum}"; then
+	echo "checksum mismatched with \"--direct-io\""
+	exit 1
+fi
+
+# Now with "--direct-io" and "--rate-limit"
+
+"${testSubject}" -K -L 800K -q "${workFile1}" > "${workFile2}"
+outputChecksum=$(cksum "${workFile2}" | awk '{print $1}')
+if ! test "${inputChecksum}" = "${outputChecksum}"; then
+	echo "checksum mismatched with \"--direct-io\" + \"--rate-limit\""
+	exit 1
+fi
+
+# Now with "--direct-io" on the same file twice
+
+"${testSubject}" -K -q "${workFile1}" "${workFile1}" > "${workFile2}"
+outputChecksum=$(cksum "${workFile2}" | awk '{print $1}')
+if ! test "${doubleInputChecksum}" = "${outputChecksum}"; then
+	echo "checksum mismatched with \"--direct-io\" on two files"
+	exit 1
+fi
+
+exit 0
+
+# EOF