tests/ls/getxattr-speedup.sh

   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) 2012-2024 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 <https://www.gnu.org/licenses/>.
  21
  22 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
  23 print_ver_ ls
  24 require_gcc_shared_
  25
  26 # Replace each getxattr and lgetxattr call with a call to these stubs.
  27 # Count those and write the total number of calls to the file "x"
  28 # via a global destructor.
  29 cat > k.c <<'EOF' || framework_failure_
  30 #include <errno.h>
  31 #include <stdio.h>
  32 #include <sys/types.h>
  33
  34 static unsigned long int n_calls;
  35
  36 static void __attribute__ ((destructor))
  37 print_call_count (void)
  38 {
  39   FILE *fp = fopen ("x", "w"); if (!fp) return;
  40   fprintf (fp, "%lu\n", n_calls); fclose (fp);
  41 }
  42
  43 static ssize_t incr () { ++n_calls; errno = ENOTSUP; return -1; }
  44 ssize_t getxattr (const char *path, const char *name, void *value, size_t size)
  45 { return incr (); }
  46 ssize_t lgetxattr(const char *path, const char *name, void *value, size_t size)
  47 { return incr (); }
  48 EOF
  49
  50 # Then compile/link it:
  51 gcc_shared_ k.c k.so \
  52   || framework_failure_ 'failed to build shared library'
  53
  54 # Create a few files:
  55 seq 20 | xargs touch || framework_failure_
  56
  57 # Finally, run the test:
  58 LD_PRELOAD=$LD_PRELOAD:./k.so ls --color=always -l . || fail=1
  59
  60 test -f x || skip_ "internal test failure: maybe LD_PRELOAD doesn't work?"
  61
  62 # Ensure that there were no more than 3 *getxattr calls.
  63 n_calls=$(cat x)
  64 test "$n_calls" -le 3 || fail=1
  65
  66 Exit $fail