Initial import

[sliver-openvswitch.git] / lib / fault.c

diff --git a/lib/fault.c b/lib/fault.c
new file mode 100644 (file)
index 0000000..c1de3d8
--- /dev/null
+++ b/lib/fault.c
@@ -0,0 +1,77 @@
+/* Copyright (C) 2007 Board of Trustees, Leland Stanford Jr. University.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include "fault.h"
+#include <dlfcn.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#include "util.h"
+
+#include "vlog.h"
+#define THIS_MODULE VLM_fault
+
+void
+fault_handler(int sig_nr)
+{
+    VLOG_EMER("Caught signal %d.", sig_nr);
+    log_backtrace();
+    fflush(stdout);
+    fflush(stderr);
+
+    signal(sig_nr, SIG_DFL);
+    raise(sig_nr);
+}
+
+void
+log_backtrace(void)
+{
+    /* During the loop:
+
+       frame[0] points to the next frame.
+       frame[1] points to the return address. */
+    void **frame;
+    for (frame = __builtin_frame_address(0);
+         frame != NULL && frame[0] != NULL;
+         frame = frame[0]) {
+        Dl_info addrinfo;
+        if (!dladdr(frame[1], &addrinfo) || !addrinfo.dli_sname) {
+            fprintf(stderr, "  0x%08"PRIxPTR"\n", (uintptr_t) frame[1]);
+        } else {
+            fprintf(stderr, "  0x%08"PRIxPTR" (%s+0x%x)\n",
+                    (uintptr_t) frame[1], addrinfo.dli_sname,
+                    (char *) frame[1] - (char *) addrinfo.dli_saddr); 
+        }
+    }
+    fflush(stderr);
+}
+
+void
+register_fault_handlers(void)
+{
+    signal(SIGABRT, fault_handler);
+    signal(SIGBUS, fault_handler);
+    signal(SIGFPE, fault_handler);
+    signal(SIGILL, fault_handler);
+    signal(SIGSEGV, fault_handler);
+}