* limitations under the License.
*/
#include <config.h>
+#include "backtrace.h"
#include "fatal-signal.h"
#include <errno.h>
#include <signal.h>
#include <string.h>
#include <unistd.h>
#include "ovs-thread.h"
-#include "poll-loop.h"
-#include "shash.h"
+#include "openvswitch/poll-loop.h"
+#include "openvswitch/shash.h"
#include "sset.h"
#include "signals.h"
#include "socket-util.h"
#include "util.h"
-#include "vlog.h"
+#include "openvswitch/vlog.h"
-#include "type-props.h"
+#include "openvswitch/type-props.h"
+
+#ifdef HAVE_UNWIND
+#include "daemon-private.h"
+#endif
#ifndef SIG_ATOMIC_MAX
#define SIG_ATOMIC_MAX TYPE_MAXIMUM(sig_atomic_t)
/* Signals to catch. */
#ifndef _WIN32
-static const int fatal_signals[] = { SIGTERM, SIGINT, SIGHUP, SIGALRM };
+static const int fatal_signals[] = { SIGTERM, SIGINT, SIGHUP, SIGALRM,
+ SIGSEGV };
#else
static const int fatal_signals[] = { SIGTERM };
#endif
static size_t n_hooks;
static int signal_fds[2];
-HANDLE wevent;
static volatile sig_atomic_t stored_sig_nr = SIG_ATOMIC_MAX;
+#ifdef _WIN32
+static HANDLE wevent;
+#endif
+
static struct ovs_mutex mutex;
-static void atexit_handler(void);
static void call_hooks(int sig_nr);
#ifdef _WIN32
static BOOL WINAPI ConsoleHandlerRoutine(DWORD dwCtrlType);
}
#endif
}
- atexit(atexit_handler);
+ atexit(fatal_signal_atexit_handler);
}
}
ovs_mutex_unlock(&mutex);
}
+#ifdef HAVE_UNWIND
+/* Convert unsigned long long to string. This is needed because
+ * using snprintf() is not async signal safe. */
+static inline int
+llong_to_hex_str(unsigned long long value, char *str)
+{
+ int i = 0, res;
+
+ if (value / 16 > 0) {
+ i = llong_to_hex_str(value / 16, str);
+ }
+
+ res = value % 16;
+ str[i] = "0123456789abcdef"[res];
+
+ return i + 1;
+}
+
+/* Send the backtrace buffer to monitor thread.
+ *
+ * Note that this runs in the signal handling context, any system
+ * library functions used here must be async-signal-safe.
+ */
+static inline void
+send_backtrace_to_monitor(void) {
+ /* volatile added to prevent a "clobbered" error on ppc64le with gcc */
+ volatile int dep;
+ struct unw_backtrace unw_bt[UNW_MAX_DEPTH];
+ unw_cursor_t cursor;
+ unw_context_t uc;
+
+ if (daemonize_fd == -1) {
+ return;
+ }
+
+ dep = 0;
+ unw_getcontext(&uc);
+ unw_init_local(&cursor, &uc);
+
+ while (dep < UNW_MAX_DEPTH && unw_step(&cursor)) {
+ memset(unw_bt[dep].func, 0, UNW_MAX_FUNCN);
+ unw_get_reg(&cursor, UNW_REG_IP, &unw_bt[dep].ip);
+ unw_get_proc_name(&cursor, unw_bt[dep].func, UNW_MAX_FUNCN,
+ &unw_bt[dep].offset);
+ dep++;
+ }
+
+ if (monitor) {
+ ignore(write(daemonize_fd, unw_bt,
+ dep * sizeof(struct unw_backtrace)));
+ } else {
+ /* Since there is no monitor daemon running, write backtrace
+ * in current process.
+ */
+ char str[] = "SIGSEGV detected, backtrace:\n";
+ char ip_str[16], offset_str[6];
+ char line[64], fn_name[UNW_MAX_FUNCN];
+
+ vlog_direct_write_to_log_file_unsafe(str);
+
+ for (int i = 0; i < dep; i++) {
+ memset(line, 0, sizeof line);
+ memset(fn_name, 0, sizeof fn_name);
+ memset(offset_str, 0, sizeof offset_str);
+ memset(ip_str, ' ', sizeof ip_str);
+ ip_str[sizeof(ip_str) - 1] = 0;
+
+ llong_to_hex_str(unw_bt[i].ip, ip_str);
+ llong_to_hex_str(unw_bt[i].offset, offset_str);
+
+ strcat(line, "0x");
+ strcat(line, ip_str);
+ strcat(line, "<");
+ memcpy(fn_name, unw_bt[i].func, UNW_MAX_FUNCN - 1);
+ strcat(line, fn_name);
+ strcat(line, "+0x");
+ strcat(line, offset_str);
+ strcat(line, ">\n");
+ vlog_direct_write_to_log_file_unsafe(line);
+ }
+ }
+}
+#else
+static inline void
+send_backtrace_to_monitor(void) {
+ /* Nothing. */
+}
+#endif
+
/* Handles fatal signal number 'sig_nr'.
*
* Ordinarily this is the actual signal handler. When other code needs to
fatal_signal_handler(int sig_nr)
{
#ifndef _WIN32
+ if (sig_nr == SIGSEGV) {
+ signal(sig_nr, SIG_DFL); /* Set it back immediately. */
+ send_backtrace_to_monitor();
+ raise(sig_nr);
+ }
ignore(write(signal_fds[1], "", 1));
#else
SetEvent(wevent);
VLOG_WARN("terminating with signal %d", (int)sig_nr);
#endif
call_hooks(sig_nr);
+ fflush(stderr);
/* Re-raise the signal with the default handling so that the program
* termination status reflects that we were killed by this signal */
fatal_signal_wait(void)
{
fatal_signal_init();
- poll_fd_wait_event(signal_fds[0], wevent, POLLIN);
+#ifdef _WIN32
+ poll_wevent_wait(wevent);
+#else
+ poll_fd_wait(signal_fds[0], POLLIN);
+#endif
}
void
#endif
}
-static void
-atexit_handler(void)
+void
+fatal_signal_atexit_handler(void)
{
call_hooks(0);
}
raise(stored_sig_nr);
}
}
+
+#ifndef _WIN32
+/* Blocks all fatal signals and returns previous signal mask into
+ * 'prev_mask'. */
+void
+fatal_signal_block(sigset_t *prev_mask)
+{
+ int i;
+ sigset_t block_mask;
+
+ sigemptyset(&block_mask);
+ for (i = 0; i < ARRAY_SIZE(fatal_signals); i++) {
+ int sig_nr = fatal_signals[i];
+ sigaddset(&block_mask, sig_nr);
+ }
+ xpthread_sigmask(SIG_BLOCK, &block_mask, prev_mask);
+}
+#endif
projects / mirror_ovs.git / blobdiff