75 lines
2.5 KiB
Bash
Executable file
75 lines
2.5 KiB
Bash
Executable file
#!/bin/sh
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# Running cp S D on an NFS client while another client has just removed D
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# would lead (w/coreutils-8.16 and earlier) to cp's initial stat call
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# seeing (via stale NFS cache) that D exists, so that cp would then call
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# open without the O_CREAT flag. Yet, the open must actually consult
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# the server, which confesses that D has been deleted, thus causing the
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# open call to fail with ENOENT.
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#
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# This test simulates that situation by intercepting stat for a nonexistent
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# destination, D, and making the stat fill in the result struct for another
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# file and return 0.
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#
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# This test is skipped on systems that lack LD_PRELOAD support; that's fine.
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# Similarly, on a system that lacks <dlfcn.h> or __xstat, skipping it is fine.
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# Copyright (C) 2012-2025 Free Software Foundation, Inc.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
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print_ver_ cp
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require_gcc_shared_
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# Replace each stat call with a call to this wrapper.
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cat > k.c <<'EOF' || framework_failure_
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <sys/types.h>
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#include <dlfcn.h>
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#define __xstat __xstat_orig
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#include <sys/stat.h>
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#include <stddef.h>
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#undef __xstat
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int
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__xstat (int ver, const char *path, struct stat *st)
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{
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static int (*real_stat)(int ver, const char *path, struct stat *st) = NULL;
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fclose(fopen("preloaded", "w"));
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if (!real_stat)
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real_stat = dlsym (RTLD_NEXT, "__xstat");
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/* When asked to stat nonexistent "d",
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return results suggesting it exists. */
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return real_stat (ver, *path == 'd' && path[1] == 0 ? "d2" : path, st);
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}
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EOF
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# Then compile/link it:
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gcc_shared_ k.c k.so \
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|| framework_failure_ 'failed to build shared library'
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touch d2 || framework_failure_
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echo xyz > src || framework_failure_
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# Finally, run the test:
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LD_PRELOAD=$LD_PRELOAD:./k.so cp src d || fail=1
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test -f preloaded || skip_ 'LD_PRELOAD was ineffective?'
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compare src d || fail=1
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Exit $fail
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