cirrus: Use FreeBSD 12.2.

[mirror_ovs.git] / lib / fatal-signal.c

diff --git a/lib/fatal-signal.c b/lib/fatal-signal.c
index 09f7c6ecf92c0bde369136db44c43fa0e03d6845..bbb31ef2751747b412f71bdaf344fb17a463a24a 100644 (file)
--- a/lib/fatal-signal.c
+++ b/lib/fatal-signal.c
@@ -158,6 +158,23 @@ fatal_signal_add_hook(void (*hook_cb)(void *aux), void (*cancel_cb)(void *aux),
 }
 
 #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
@@ -184,10 +201,43 @@ send_backtrace_to_monitor(void) {
         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++;
+        dep++;
     }
 
-    ignore(write(daemonize_fd, unw_bt, dep * sizeof(struct unw_backtrace)));
+    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