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110 lines
2.3 KiB
C
110 lines
2.3 KiB
C
/* libunwind - a platform-independent unwind library
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Copyright (C) 2009 Google, Inc
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Contributed by Arun Sharma <arun.sharma@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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#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 <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_errors;
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int in_unwind;
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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_errors++;
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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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unw_word_t ip, sp;
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unw_cursor_t cursor;
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unw_context_t uc;
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int ret;
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in_unwind = 1;
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unw_getcontext (&uc);
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if (unw_init_local (&cursor, &uc) < 0)
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panic ("unw_init_local failed!\n");
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do
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{
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unw_get_reg (&cursor, UNW_REG_IP, &ip);
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unw_get_reg (&cursor, UNW_REG_SP, &sp);
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ret = unw_step (&cursor);
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if (ret < 0)
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{
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++num_errors;
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}
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}
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while (ret > 0);
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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 ()
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{
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foo2 ();
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}
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int
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main (void)
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{
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foo1();
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if (num_errors > 0)
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{
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fprintf (stderr, "FAILURE: detected %d errors\n", num_errors);
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exit (-1);
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}
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return 0;
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}
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