1 files changed, 73 insertions, 0 deletions
diff --git a/tests/misc/sort-merge-fdlimit.sh b/tests/misc/sort-merge-fdlimit.sh
new file mode 100755
index 000000000..7ce109c1a
--- /dev/null
+++ b/tests/misc/sort-merge-fdlimit.sh
@@ -0,0 +1,73 @@
+#!/bin/sh
+# Test whether sort avoids opening more file descriptors than it is
+# allowed when merging files.
+
+# Copyright (C) 2009-2012 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 3 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, see <http://www.gnu.org/licenses/>.
+
+. "${srcdir=.}/init.sh"; path_prepend_ ../src
+print_ver_ sort
+require_ulimit_
+
+mkdir in err || framework_failure_
+
+
+for i in $(seq 17); do
+  echo $i >in/$i
+done
+seq 17 >some-data
+
+# When these tests are run inside the automated testing framework, they
+# have one less available file descriptor than when run outside the
+# automated testing framework. If a test with a batch size of b fails
+# inside the ATF, then the same test with batch size b+1 may pass outside
+# the ATF but fail inside it.
+
+# The default batch size (nmerge) is 16.
+(ulimit -n 19 \
+   && sort -m --batch-size=16 in/* 2>err/merge-default-err \
+   || ! grep "open failed" err/merge-default-err) || fail=1
+
+# If sort opens a file to sort by random hashes of keys,
+# it needs to consider this file against its limit on open file
+# descriptors.  Test once with the default random source
+# and once with an explicit source.
+for randsource in '' --random-source=some-data; do
+  (ulimit -n 20 \
+     && sort -mR $randsource --batch-size=16 in/* 2>err/merge-random-err \
+     || ! grep "open failed" err/merge-random-err) || fail=1
+done
+
+# 'sort -m' should work in a limited file descriptor
+# environment when the output is repeatedly one of its inputs.
+# In coreutils 8.7 and earlier, 'sort' would dump core on this test.
+#
+# This test uses 'exec' to redirect file descriptors rather than
+# ordinary redirection on the 'sort' command.  This is intended to
+# work around bugs in OpenBSD /bin/sh, and some other sh variants,
+# that squirrel away file descriptors before closing them; see
+# <http://lists.gnu.org/archive/html/bug-tar/2010-10/msg00075.html>.
+# This test finds the bug only with shells that do not close FDs on
+# exec, and will miss the bug (if present) on other shells, but it's
+# not easy to fix this without running afoul of the OpenBSD-like sh bugs.
+(seq 6 && echo 6) >exp || fail=1
+echo 6 >out || fail=1
+(exec 3<&- 4<&- 5<&- 6</dev/null 7<&6 8<&6 9<&6 &&
+ ulimit -n 10 &&
+ sort -n -m --batch-size=7 -o out out in/1 in/2 in/3 in/4 in/5 out
+) &&
+compare exp out || fail=1
+
+Exit $fail