1 files changed, 25 insertions, 12 deletions
diff --git a/error.c b/error.c
index 9633e9e252..55834a3cd8 100644
--- a/error.c
+++ b/error.c
@@ -24,6 +24,17 @@
 
 extern const char ruby_description[];
 
+static const char *
+rb_strerrno(int err)
+{
+#define defined_error(name, num) if (err == num) return name;
+#define undefined_error(name) 
+#include "known_errors.inc"
+#undef defined_error
+#undef undefined_error
+    return NULL;
+}
+
 static int
 err_position_0(char *buf, long len, const char *file, int line)
 {
@@ -236,6 +247,20 @@ rb_bug(const char *fmt, ...)
 }
 
 void
+rb_bug_errno(const char *mesg, int errno_arg)
+{
+    if (errno_arg == 0)
+        rb_bug("%s: errno == 0 (NOERROR)", mesg);
+    else {
+        const char *errno_str = rb_strerrno(errno_arg);
+        if (errno_str)
+            rb_bug("%s: %s (%s)", mesg, strerror(errno_arg), errno_str);
+        else
+            rb_bug("%s: %s (%d)", mesg, strerror(errno_arg), errno_arg);
+    }
+}
+
+void
 rb_compile_bug(const char *file, int line, const char *fmt, ...)
 {
     va_list args;
@@ -1258,18 +1283,6 @@ Init_syserr(void)
 #undef undefined_error
 }
 
-const char *
-rb_strerrno(int err)
-{
-    if (err == 0) return "NOERROR";
-#define defined_error(name, num) if (err == num) return name;
-#define undefined_error(name) 
-#include "known_errors.inc"
-#undef defined_error
-#undef undefined_error
-    return "UNKNOWNERROR";
-}
-
 static void
 err_append(const char *s)
 {