tests/ls/getxattr-speedup

   1 #!/bin/sh
   2 # Show that we've eliminated most of ls' failing getxattr syscalls,
   3 # regardless of how many files are in a directory we list.
   4 # This test is skipped on systems that lack LD_PRELOAD support; that's fine.
   5 # Similarly, on a system that lacks getxattr altogether, skipping it is fine.
   6
   7 # Copyright (C) 2012 Free Software Foundation, Inc.
   8
   9 # This program is free software: you can redistribute it and/or modify
  10 # it under the terms of the GNU General Public License as published by
  11 # the Free Software Foundation, either version 3 of the License, or
  12 # (at your option) any later version.
  13
  14 # This program is distributed in the hope that it will be useful,
  15 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 # GNU General Public License for more details.
  18
  19 # You should have received a copy of the GNU General Public License
  20 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21
  22 . "${srcdir=.}/init.sh"; path_prepend_ ../src
  23 print_ver_ ls
  24
  25 # Replace each getxattr and lgetxattr call with a call to these stubs.
  26 # Count those and write the total number of calls to the file "x"
  27 # via a global destructor.
  28 cat > k.c <<'EOF' || framework_failure_
  29 #include <errno.h>
  30 #include <stdio.h>
  31 #include <sys/types.h>
  32
  33 static unsigned long int n_calls;
  34
  35 static void __attribute__ ((destructor))
  36 print_call_count (void)
  37 {
  38   FILE *fp = fopen ("x", "w"); if (!fp) return;
  39   fprintf (fp, "%lu\n", n_calls); fclose (fp);
  40 }
  41
  42 static ssize_t incr () { ++n_calls; errno = ENOTSUP; return -1; }
  43 ssize_t getxattr (const char *path, const char *name, void *value, size_t size)
  44 { return incr (); }
  45 ssize_t lgetxattr(const char *path, const char *name, void *value, size_t size)
  46 { return incr (); }
  47 EOF
  48
  49 # Then compile/link it:
  50 $CC -shared -fPIC -O2 k.c -o k.so \
  51   || framework_failure_ 'failed to compile with -shared -fPIC'
  52
  53 # Create a few files:
  54 seq 20 | xargs touch || framework_failure_
  55
  56 # Finally, run the test:
  57 LD_PRELOAD=./k.so ls --color=always -l . || fail=1
  58
  59 test -f x || skip_ "internal test failure: maybe LD_PRELOAD doesn't work?"
  60
  61 # Ensure that there were no more than 3 *getxattr calls.
  62 n_calls=$(cat x)
  63 test "$n_calls" -le 3 || fail=1
  64
  65 Exit $fail