[unwind] Generate crash report on segfault.

Examples/test_script_mode.sh

@@ -26,6 +26,6 @@ else
     echo "mies"
     echo -en "-------------\0nonselectable\x1ftrue\n"
     echo "testing"
-    echo "<b>Bold</b>"
+    echo -en "<b>Bold</b>\x00meta\x1fclapton.\n"
     echo "quit"
 fi

Makefile.am

@@ -145,6 +145,7 @@ rofi_CFLAGS=\
 	$(pango_CFLAGS)\
 	$(libsn_CFLAGS)\
 	$(cairo_CFLAGS)\
+	$(unwind_CFLAGS)\
 	$(gdkpixbuf_CFLAGS)\
 	-DMANPAGE_PATH="\"$(mandir)/\""\
 	-I$(top_srcdir)/include/\
@@ -165,6 +166,7 @@ rofi_LDADD=\
 	$(libsn_LIBS)\
 	$(pango_LIBS)\
 	$(cairo_LIBS)\
+	$(unwind_LIBS)\
 	$(gdkpixbuf_LIBS)\
 	$(LIBS)
 

configure.ac

@@ -149,6 +149,7 @@ PKG_CHECK_MODULES([pango],    [pango pangocairo])
 PKG_CHECK_MODULES([cairo],	  [cairo cairo-xcb])
 PKG_CHECK_MODULES([libsn],    [libstartup-notification-1.0 ])
 PKG_CHECK_MODULES([gdkpixbuf],    [gdk-pixbuf-2.0])
+PKG_CHECK_MODULES([unwind],    [libunwind])
 
 dnl ---------------------------------------------------------------------
 dnl check - Unit testing.

meson.build

@@ -69,6 +69,7 @@ deps += [
     dependency('xcb-xinerama'),
     dependency('cairo-xcb'),
     dependency('libstartup-notification-1.0'),
+    dependency('libunwind'),
 ]
 
 check = dependency('check', version: '>= 0.11.0', required: get_option('check'))

source/dialogs/filebrowser.c

@@ -541,12 +541,34 @@ static cairo_surface_t *_get_icon ( const Mode *sw, unsigned int selected_line,
     return rofi_icon_fetcher_get ( dr->icon_fetch_uid );
 }
 
+static const char * _get_sort_method ( void )
+{
+    switch ( file_browser_config.sorting_method )
+    {
+        default:
+        case FB_SORT_NAME:
+            return "name";
+        case FB_SORT_TIME:
+            switch ( file_browser_config.sorting_time )
+            {
+                case FB_MTIME:
+                    return "modification time";
+                case FB_ATIME:
+                    return "access time";
+                case FB_CTIME:
+                default:
+                   return "creation time"; 
+            }
+    }
+}
+
 static char * _get_message ( const Mode *sw )
 {
     FileBrowserModePrivateData *pd = (FileBrowserModePrivateData *) mode_get_private_data ( sw );
     if ( pd->current_dir ) {
         char *dirname = g_file_get_parse_name ( pd->current_dir );
-        char *str     = g_markup_printf_escaped ( "<b>Current directory:</b> %s", dirname );
+        char *str     = g_markup_printf_escaped ( "<b>Current directory:</b> %s\n\<b>Sort by:</b>  %s", dirname,
+                _get_sort_method());
         g_free ( dirname );
         return str;
     }

source/rofi.c

@@ -47,6 +47,9 @@
 
 #include <libgwater-xcb.h>
 
+#define UNW_LOCAL_ONLY
+#include <libunwind.h>
+
 #ifdef USE_NK_GIT_VERSION
 #include "nkutils-git-version.h"
 #ifdef NK_GIT_VERSION
@@ -679,6 +682,47 @@ static gboolean main_loop_signal_handler_int ( G_GNUC_UNUSED gpointer data )
     g_main_loop_quit ( main_loop );
     return G_SOURCE_CONTINUE;
 }
+
+static void send_backtrace_to_monitor(void) {
+    unw_cursor_t cursor;
+    unw_context_t context;
+
+    fprintf(stderr, "----------===== Backtrace =====----------\n");
+    // grab the machine context and initialize the cursor
+    if (unw_getcontext(&context) < 0) {
+        fprintf(stderr, "ERROR: cannot get local machine state\n");
+    }
+    if (unw_init_local(&cursor, &context) < 0) {
+        fprintf(stderr,"ERROR: cannot initialize cursor for local unwinding\n");
+    }
+
+
+    // currently the IP is within backtrace() itself so this loop
+    // deliberately skips the first frame.
+    while (unw_step(&cursor) > 0) {
+        unw_word_t offset = 0, pc = 0;
+        char sym[4096];
+        if (unw_get_reg(&cursor, UNW_REG_IP, &pc)) {
+            fprintf(stderr,"ERROR: cannot read program counter\n");
+        }
+
+        fprintf(stderr, "0x%lx: ", pc);
+
+        if (unw_get_proc_name(&cursor, sym, sizeof(sym), &offset) == 0) {
+            fprintf(stderr,"(%s +0x%lx)\n", sym, offset);
+        } else {
+            fprintf(stderr, "-- no symbol name found\n");
+        }
+    }
+    fprintf(stderr, "----------===== Backtrace =====----------\n");
+}
+
+static void main_loop_signal_handler_sigsegv_int ( int signr )
+{
+    signal(signr, SIG_DFL); /* Set it back immediately. */
+    send_backtrace_to_monitor();
+    raise(signr);
+}
 static void show_error_dialog ()
 {
     GString *emesg = g_string_new ( "The following errors were detected when starting rofi:\n" );
@@ -1073,6 +1117,8 @@ int main ( int argc, char *argv[] )
     // SIGINT
     g_unix_signal_add ( SIGINT, main_loop_signal_handler_int, NULL );
 
+    signal ( SIGSEGV, main_loop_signal_handler_sigsegv_int );
+
     g_idle_add ( startup, NULL );
 
     // Start mainloop.