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Both the demo and the test asserted that each running instance of a module gets its own copy of a library named in DT_NEEDED: two instances adding their own seed each saw a total of seed*3. That was true of the loader that walked DT_NEEDED itself. The loader now hands the work to dlopen(), which returns the object already in the module registry rather than loading a second copy of it, so there is one library and one set of its globals, shared by every module that names it. The module's own data stays private per instance, because exec() loads the module afresh each time. What an instance can still assert on its own is that every add it made landed in the library, so that is what it checks; the totals interleave and the final one counts both. The test additionally checks the consequences: the library is pinned once rather than once per instance, and its destructor runs once, at the last close, holding what both instances built up. USER_FAIL_PRIVATE becomes USER_FAIL_SHARED rather than gaining a companion. The bit is a private protocol between cxxuser.cpp, which sets it, and testing/fs/xipfs, which reads it; nothing else names it, and the property it used to report no longer exists. Assisted-by: Claude Opus 5 (1M context) <noreply@anthropic.com> Signed-off-by: Marco Casaroli <marco.casaroli@gmail.com>
72 lines
2.8 KiB
C
72 lines
2.8 KiB
C
/****************************************************************************
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* apps/examples/fdpicxip/modules/user.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/* Uses libcounter.so. Two instances run concurrently, and there is one
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* library between them: DT_NEEDED is loaded with dlopen(), which returns
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* the object already in the registry rather than a second copy of it, so
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* the totals interleave and the final one counts both instances' bumps.
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* What each instance can assert on its own is that every bump it made
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* landed somewhere it can still see.
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*
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* libcounter is also a *leaf* library -- it calls nothing outside itself,
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* so it has no PLT and therefore no DT_PLTGOT. The loader has to fall back
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* to PT_DYNAMIC vaddr + memsz to find its GOT. If that fallback is wrong
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* the library cannot reach its own globals, which is exactly what the total
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* below would expose.
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*/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <stdlib.h>
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#include <syslog.h>
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#include <unistd.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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extern int counter_bump(int by);
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extern int counter_total(void);
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int main(int argc, char *argv[])
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{
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int seed = (argc > 1) ? atoi(argv[1]) : 0;
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int i;
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for (i = 0; i < 3; i++)
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{
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counter_bump(seed);
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usleep(100000);
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}
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syslog(LOG_INFO, "[user %d] library total = %d (at least %d) -- %s\n",
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seed, counter_total(), seed * 3,
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counter_total() >= seed * 3 ? "PASS" : "FAIL");
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/* Reported through the exit status as well as the log, so a test can
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* assert on it rather than a human reading the console.
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*/
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return counter_total() >= seed * 3 ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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