| # Ensure we diagnose failure to drop caches | |
| # We didn't check the return from posix_fadvise() correctly before v9.7 | |
| # Copyright (C) 2025 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 <https://www.gnu.org/licenses/>. | |
| . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src | |
| print_ver_ dd | |
| require_gcc_shared_ | |
| # Replace each getxattr and lgetxattr call with a call to these stubs. | |
| # Count those and write the total number of calls to the file "x" | |
| # via a global destructor. | |
| cat > k.c <<'EOF' || framework_failure_ | |
| #include <errno.h> | |
| #include <fcntl.h> | |
| #include <stdio.h> | |
| #include <sys/types.h> | |
| int posix_fadvise (int fd, off_t offset, off_t len, int advice) | |
| { | |
| fopen ("called", "w"); | |
| return ENOTSUP; /* Simulate non standard error indication. */ | |
| } | |
| EOF | |
| # Then compile/link it: | |
| gcc_shared_ k.c k.so \ | |
| || framework_failure_ 'failed to build shared library' | |
| touch ifile || framework_failure_ | |
| LD_PRELOAD=$LD_PRELOAD:./k.so dd if=ifile iflag=nocache count=0 2>err | |
| ret=$? | |
| test -f called || skip_ "internal test failure: maybe LD_PRELOAD doesn't work?" | |
| grep 'dd: failed to discard cache for: ifile' err || fail=1 | |
| # Ensure that the dd command failed | |
| test "$ret" = 1 || fail=1 | |
| Exit $fail | |