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d86155f72e
We'd like to avoid calls to all malloc related functions so libunwind is still usable from such allocators. Signed-off-by: Paul Pluzhnikov <ppluzhnikov@google.com>
137 lines
3 KiB
C
137 lines
3 KiB
C
/* libunwind - a platform-independent unwind library
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Copyright (C) 2011 Google, Inc
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Contributed by Paul Pluzhnikov <ppluzhnikov@google.com>
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <execinfo.h> /* for backtrace */
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <dlfcn.h>
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#include <pthread.h>
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#include <libunwind.h>
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#define panic(args...) \
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{ fprintf (stderr, args); exit (-1); }
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int verbose;
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int num_mallocs;
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int num_callocs;
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int in_unwind;
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void *
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calloc(size_t n, size_t s)
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{
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static void * (*func)();
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#ifdef __GLIBC__
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/* In glibc, dlsym() calls calloc. Calling dlsym(RTLD_NEXT, "calloc") here
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causes infinite recursion. Instead, we simply use it by its other
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name. */
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extern void *__libc_calloc();
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func = &__libc_calloc;
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#else
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if(!func)
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func = (void *(*)()) dlsym(RTLD_NEXT, "calloc");
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#endif
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if (in_unwind) {
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num_callocs++;
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return NULL;
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} else {
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return func(n, s);
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}
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}
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void *
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malloc(size_t s)
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{
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static void * (*func)();
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if(!func)
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func = (void *(*)()) dlsym(RTLD_NEXT, "malloc");
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if (in_unwind) {
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num_mallocs++;
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return NULL;
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} else {
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return func(s);
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}
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}
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static void
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do_backtrace (void)
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{
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const int num_levels = 100;
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void *pc[num_levels];
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in_unwind = 1;
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backtrace(pc, num_levels);
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in_unwind = 0;
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}
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void
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foo3 ()
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{
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do_backtrace ();
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}
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void
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foo2 ()
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{
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foo3 ();
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}
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void
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foo1 (void)
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{
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foo2 ();
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return NULL;
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}
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int
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main (int argc, char **argv)
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{
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int i, num_errors;
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/* Create (and leak) 100 TSDs, then call backtrace()
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and check that it doesn't call malloc()/calloc(). */
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for (i = 0; i < 100; ++i) {
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pthread_key_t key;
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if (pthread_key_create (&key, NULL))
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panic ("FAILURE: unable to create key %d\n", i);
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}
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foo1 ();
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num_errors = num_mallocs + num_callocs;
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if (num_errors > 0)
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{
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fprintf (stderr,
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"FAILURE: detected %d error%s (malloc: %d, calloc: %d)\n",
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num_errors, num_errors > 1 ? "s" : "",
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num_mallocs, num_callocs);
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exit (-1);
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}
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return 0;
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}
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