tests: test for ls speed-up

* tests/ls/getxattr-speedup: New test.
* tests/Makefile.am (TESTS): Add it.
Improved-by: Bernhard Voelker

1 files changed, 64 insertions, 0 deletions

diff --git a/tests/ls/getxattr-speedup b/tests/ls/getxattr-speedup
new file mode 100755
index 000000000..2b7a1f3ac
--- /dev/null
+++ b/tests/ls/getxattr-speedup
@@ -0,0 +1,64 @@
+#!/bin/sh
+# Show that we've eliminated most of ls' failing getxattr syscalls,
+# regardless of how many files are in a directory we list.
+# This test is skipped on systems that lack LD_PRELOAD support; that's fine.
+# Similarly, on a system that lacks getxattr altogether, skipping it is fine.
+
+# Copyright (C) 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/>.
+
+. "${srcdir=.}/init.sh"; path_prepend_ ../src
+print_ver_ ls
+
+# Replace each getxattr and lgetxattr call with a call to these stubs.
+# Count those and write the total number of calls to the file "x"
+# via a global destructor.
+cat > k.c <<'EOF' || framework_failure_
+#include <errno.h>
+#include <stdio.h>
+
+static unsigned long int n_calls;
+
+static void __attribute__ ((destructor))
+print_call_count (void)
+{
+  FILE *fp = fopen ("x", "w"); if (!fp) return;
+  fprintf (fp, "%lu\n", n_calls); fclose (fp);
+}
+
+static ssize_t incr () { ++n_calls; errno = ENOTSUP; return -1; }
+ssize_t getxattr (const char *path, const char *name, void *value, size_t size)
+{ return incr (); }
+ssize_t lgetxattr(const char *path, const char *name, void *value, size_t size)
+{ return incr (); }
+EOF
+
+# Then compile/link it:
+$CC -fPIC -O2 -c k.c || framework_failure_ 'failed to compile with -fPIC'
+ld -G k.o -lc -o k.so || framework_failure_ 'failed to invoke ld -G ...'
+
+# Create a few files:
+seq 20 | xargs touch || framework_failure_
+
+# Finally, run the test:
+LD_PRELOAD=./k.so ls --color=always -l . || fail=1
+
+test -f x || skip_ "internal test failure: maybe LD_PRELOAD doesn't work?"
+
+# Ensure that there were no more than 3 *getxattr calls.
+n_calls=$(cat x)
+test "$n_calls" -le 3 || fail=1
+
+Exit $fail