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118 lines
2.8 KiB
C
118 lines
2.8 KiB
C
/* Copyright (C) 2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* This test checks that leakage does not happen from repeated loads
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of a module with TLS. */
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#include <dlfcn.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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int (*tlsmod_fun) (void);
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/* Async-signal-safe TLS space is gotten via custom allocator using mmap(), so
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it doesn't work to use functions like mtrace() or mallinfo(). */
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size_t get_vm_size (void)
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{
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long result;
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FILE *f = fopen ("/proc/self/statm", "r");
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if (!f)
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{
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fprintf (stderr, "get_vm_size could not open /proc/self/statm\n");
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return 0;
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}
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if (fscanf (f, "%lu", &result) != 1)
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{
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fprintf (stderr, "get_vm_size failed to read size\n");
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return 0;
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}
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if (fclose (f) != 0)
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{
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fprintf (stderr, "get_vm_size fclose failed\n");
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return 0;
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}
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return (size_t) result;
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}
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int
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do_test (void)
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{
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int count = 0;
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size_t start_size = get_vm_size ();
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if (start_size == 0)
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{
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puts ("Cannot get vm size, test cannot run");
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exit (0);
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}
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/* Open, use, and close a shared library repeatedly. */
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for (int i = 0; i < 1000; ++i)
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{
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void *h = dlopen ("tst-tls7leakmod.so", RTLD_NOW);
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if (h == NULL)
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{
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puts ("dlopen failed");
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exit (1);
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}
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tlsmod_fun = dlsym (h, "module_fun");
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if (tlsmod_fun == NULL)
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{
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puts ("dlsym for module_fun failed");
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exit (1);
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}
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count += tlsmod_fun ();
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/* Don't leave dangling pointer after dlclose. */
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tlsmod_fun = NULL;
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if (dlclose (h))
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{
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puts ("dlclose failed");
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exit (1);
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}
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}
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size_t end_size = get_vm_size ();
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printf ("VM usage went from %ld to %ld pages", start_size, end_size);
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/* Allow for some growth in usage. */
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if ((end_size - start_size) > 10)
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{
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printf (", which indicates a leak in TLS allocation\n");
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return 1;
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}
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else
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{
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printf (", which is acceptable\n");
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return 0;
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}
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}
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#define TIMEOUT 8
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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