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- /* Copyright (c) 2013, The Tor Project, Inc. */
- /* See LICENSE for licensing information */
- #include "orconfig.h"
- #include "backtrace.h"
- #include "compat.h"
- #include "util.h"
- #include "torlog.h"
- #ifdef HAVE_EXECINFO_H
- #include <execinfo.h>
- #endif
- #ifdef HAVE_FCNTL_H
- #include <fcntl.h>
- #endif
- #ifdef HAVE_UNISTD_H
- #include <unistd.h>
- #endif
- #if defined(HAVE_EXECINFO_H) && defined(HAVE_BACKTRACE) && \
- defined(HAVE_BACKTRACE_SYMBOLS_FD) && defined(HAVE_SIGACTION)
- #define USE_BACKTRACE
- #endif
- #if !defined(USE_BACKTRACE)
- #define NO_BACKTRACE_IMPL
- #endif
- static char *bt_version = NULL;
- #ifdef USE_BACKTRACE
- #define MAX_DEPTH 256
- static void *cb_buf[MAX_DEPTH];
- /**DOCDOC*/
- void
- dump_backtrace(const char *msg)
- {
- int depth;
- const int *fds;
- int n_fds;
- int i;
- if (!msg) msg = "unspecified crash";
- depth = backtrace(cb_buf, MAX_DEPTH);
- tor_log_err_sigsafe(bt_version, " died: ", msg, "\n",
- NULL);
- n_fds = tor_log_get_sigsafe_err_fds(&fds);
- for (i=0; i < n_fds; ++i)
- backtrace_symbols_fd(cb_buf, depth, fds[i]);
- }
- /**DOCDOC*/
- static int
- install_bt_handler(void)
- {
- /*XXXX add signal handlers */
- /*XXXX make this idempotent */
- return 0;
- }
- /**DOCDOC*/
- static void
- remove_bt_handler(void)
- {
- }
- #endif
- #ifdef NO_BACKTRACE_IMPL
- /**DOCDOC*/
- void
- dump_backtrace(const char *msg)
- {
- tor_log_err_sigsafe(bt_version, " died: ", msg, "\n", NULL);
- }
- /**DOCDOC*/
- static int
- install_bt_handler(void)
- {
- return 0;
- }
- /**DOCDOC*/
- static void
- remove_bt_handler(void)
- {
- }
- #endif
- /**DOCDOC*/
- int
- configure_backtrace_handler(const char *tor_version)
- {
- tor_free(bt_version);
- if (!tor_version)
- tor_version = "Tor";
- bt_version = tor_strdup(tor_version);
- return install_bt_handler();
- }
- /**DOCDOC*/
- void
- clean_up_backtrace_handler(void)
- {
- remove_bt_handler();
- tor_free(bt_version);
- }
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