2005-12-20 Jeremy Katz <katzj@redhat.com>

	* loader2/loader.c: Give a stacktrace on SIGSEGV to make things
	easier to debug.

1 files changed, 24 insertions, 0 deletions

diff --git a/loader2/loader.c b/loader2/loader.c
index 098f99f0c..f722e5b01 100644
--- a/loader2/loader.c
+++ b/loader2/loader.c
@@ -24,6 +24,7 @@
 
 #include <ctype.h>
 #include <errno.h>
+#include <execinfo.h>
 #include <fcntl.h>
 #include <newt.h>
 #include <popt.h>
@@ -1138,6 +1139,26 @@ static int hasGraphicalOverride() {
     return 0;
 }
 
+static void loaderSegvHandler(int signum) {
+    void *array[10];
+    size_t size;
+    char **strings;
+    size_t i;
+
+    signal(SIGSEGV, SIG_DFL); /* back to default */
+    
+    newtFinished();
+    size = backtrace (array, 10);
+    strings = backtrace_symbols (array, size);
+    
+    printf ("loader received SIGSEGV!.  Backtrace:\n");
+    for (i = 0; i < size; i++)
+        printf ("%s\n", strings[i]);
+     
+    free (strings);
+    exit(1);
+}
+
 int main(int argc, char ** argv) {
     int flags = LOADER_FLAGS_SELINUX | LOADER_FLAGS_NOFB;
     struct stat sb;
@@ -1175,6 +1196,9 @@ int main(int argc, char ** argv) {
         { 0, 0, 0, 0, 0, 0, 0 }
     };
 
+    /* set up signal handler */
+    signal(SIGSEGV, loaderSegvHandler);
+
     /* Make sure sort order is right. */
     setenv ("LC_COLLATE", "C", 1);