From 4516416d3d0263891896488d2831f2dc4bdf79ee Mon Sep 17 00:00:00 2001
From: Toni Uhlig <matzeton@googlemail.com>
Date: Fri, 10 Nov 2017 20:51:45 +0100
Subject: xmonad.hs update, basic c stacktrace handler module
---
btrace.c | 100 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 100 insertions(+)
create mode 100644 btrace.c
(limited to 'btrace.c')
diff --git a/btrace.c b/btrace.c
new file mode 100644
index 0000000..e9ade89
--- /dev/null
+++ b/btrace.c
@@ -0,0 +1,100 @@
+#include <execinfo.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#define STACKTRACES 10
+
+
+static char *exec_path = NULL;
+
+
+void bt_set_arg0(const char *arg0) {
+ if (!exec_path && arg0) {
+ exec_path = strdup(arg0);
+ }
+}
+
+static void addr_to_array(char **strings, size_t siz, char **result) {
+ char *start, *end;
+
+ for (size_t i = 0; i < siz; ++i) {
+ start = strchr(strings[i], '+');
+ if (start) {
+ end = strchr(start, ')');
+ start++;
+ if (end)
+ result[i] = strndup(start, end-start);
+ else
+ result[i] = strdup("");
+ }
+ }
+}
+
+void bt_print_trace (void) {
+ void *array[STACKTRACES];
+ size_t bt_size;
+ char **strings;
+ size_t i;
+ char **addrs;
+
+ bt_size = backtrace(array, STACKTRACES);
+ strings = backtrace_symbols(array, bt_size);
+
+ printf("\n\n[1] Obtained %zd stack frames.\n", bt_size);
+ for (i = 0; i < bt_size; ++i)
+ printf("%s\n", strings[i]);
+
+ /* addr2line -p -e ./btrace -f -i [addresses] */
+ if (exec_path) {
+ addrs = (char**) calloc(bt_size, sizeof(*addrs));
+
+ addr_to_array(strings, bt_size, addrs);
+ printf("\n\n[2] Run for more info: addr2line -p -e %s -f -i", exec_path);
+ for (i = 0; i < bt_size; ++i) {
+ printf(" %s", addrs[i]);
+ }
+ printf("%s\n", "");
+
+ for (i = 0; i < bt_size; ++i)
+ if (addrs[i])
+ free(addrs[i]);
+ free(addrs);
+ }
+
+ free(strings);
+}
+
+void bt_sighandler(int signum) {
+ bt_print_trace();
+ switch (signum) {
+ case SIGTERM:
+ case SIGABRT:
+ case SIGSEGV:
+ exit(1);
+ }
+}
+
+
+
+
+/* A dummy function to make the backtrace more interesting. */
+void dummy_function(void) {
+ bt_print_trace();
+}
+
+#include <assert.h>
+int main(int argc, char **argv) {
+ bt_set_arg0(argv[0]);
+ dummy_function();
+ signal(SIGTERM, bt_sighandler);
+ signal(SIGABRT, bt_sighandler);
+ signal(SIGSEGV, bt_sighandler);
+
+ //assert(0);
+ *(int*)(NULL) = 0;
+ return 0;
+}
--
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