1 files changed, 56 insertions, 0 deletions
diff --git a/gdbsupport/safe-strerror.c b/gdbsupport/safe-strerror.c
new file mode 100644
index 00000000000..580462102e2
--- /dev/null
+++ b/gdbsupport/safe-strerror.c
@@ -0,0 +1,56 @@
+/* Safe version of strerror for GDB, the GNU debugger.
+
+   Copyright (C) 2006-2020 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include "common-defs.h"
+#include <string.h>
+
+/* There are two different versions of strerror_r; one is GNU-specific, the
+   other XSI-compliant.  They differ in the return type.  This overload lets
+   us choose the right behavior for each return type.  We cannot rely on Gnulib
+   to solve this for us because IPA does not use Gnulib but uses this
+   function.  */
+
+/* Called if we have a XSI-compliant strerror_r.  */
+ATTRIBUTE_UNUSED static char *
+select_strerror_r (int res, char *buf)
+{
+  return res == 0 ? buf : nullptr;
+}
+
+/* Called if we have a GNU strerror_r.  */
+ATTRIBUTE_UNUSED static char *
+select_strerror_r (char *res, char *)
+{
+  return res;
+}
+
+/* Implementation of safe_strerror as defined in common-utils.h.  */
+
+const char *
+safe_strerror (int errnum)
+{
+  static thread_local char buf[1024];
+
+  char *res = select_strerror_r (strerror_r (errnum, buf, sizeof (buf)), buf);
+  if (res != nullptr)
+    return res;
+
+  xsnprintf (buf, sizeof buf, "(undocumented errno %d)", errnum);
+  return buf;
+}