1 files changed, 44 insertions, 0 deletions
diff --git a/backtrace.c b/backtrace.c
new file mode 100644
index 0000000..2ceb334
--- /dev/null
+++ b/backtrace.c
@@ -0,0 +1,44 @@
+#include <dlfcn.h>
+#include <stddef.h>
+#include <stdlib.h>
+
+#define _frame_level(addr_buf, curr, frame, size) \
+	if(__builtin_frame_address(frame) != NULL && (curr = __builtin_return_address(frame)) > 0x1000 && frame <= size) addr_buf[frame] = curr; \
+	else return size;
+
+int backtrace(void **addr_buf, int size)
+{
+	void *curr;
+	_frame_level(addr_buf, curr, 0, size)
+	_frame_level(addr_buf, curr, 1, size)
+	_frame_level(addr_buf, curr, 2, size)
+	_frame_level(addr_buf, curr, 3, size)
+	_frame_level(addr_buf, curr, 4, size)
+	_frame_level(addr_buf, curr, 5, size)
+	_frame_level(addr_buf, curr, 6, size)
+	_frame_level(addr_buf, curr, 7, size)
+	_frame_level(addr_buf, curr, 8, size)
+	_frame_level(addr_buf, curr, 9, size)
+	return 9;
+}
+
+char **backtrace_symbols(void * const *addr_buf, int size)
+{
+	char **result = calloc(sizeof(char *), size);
+	if(result == NULL) return result;
+
+	for(int next = 0; next < size; next++)
+	{
+		Dl_info info;
+		int err = dladdr(addr_buf[next], &info);
+
+		if(err != 0)
+		{
+			result[next] = "??:0";
+		} else {
+			result[next] = info.dli_sname;
+		}
+	}
+
+	return result;
+}