Print /proc/<pid>/maps on segfault

1 files changed, 20 insertions, 0 deletions

diff --git a/common/log.c b/common/log.c
index f9242bf4..0c0ecf89 100644
--- a/common/log.c
+++ b/common/log.c
@@ -1,5 +1,6 @@
 #include "log.h"
 #include "sway.h"
+#include "readline.h"
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -142,6 +143,9 @@ void error_handler(int sig) {
         void *array[max_lines];
         char **bt;
         size_t bt_len;
+        char maps_file[256];
+        char maps_buffer[1024];
+        FILE *maps;
 
         sway_log(L_ERROR, "Error: Signal %d. Printing backtrace", sig);
         bt_len = backtrace(array, max_lines);
@@ -155,6 +159,22 @@ void error_handler(int sig) {
         for (i = 0; (size_t)i < bt_len; i++) {
                 sway_log(L_ERROR, "Backtrace: %s", bt[i]);
         }
+
+        sway_log(L_ERROR, "Maps:");
+        pid_t pid = getpid();
+        if (snprintf(maps_file, 255, "/proc/%zd/maps", (size_t)pid) < 255) {
+                maps = fopen(maps_file, "r");
+                while (!feof(maps)) {
+                        char *m = read_line_buffer(maps, maps_buffer, 1024);
+                        if (!m) {
+                                fclose(maps);
+                                sway_log(L_ERROR, "Unable to allocate memory to show maps");
+                                break;
+                        }
+                        sway_log(L_ERROR, m);
+                }
+                fclose(maps);
+        }
 #else
         sway_log(L_ERROR, "Error: Signal %d.", sig);
 #endif