1 files changed, 48 insertions, 0 deletions
diff --git a/posix/tst-libc-message.c b/posix/tst-libc-message.c
new file mode 100644
index 0000000..b85195e
--- /dev/null
+++ b/posix/tst-libc-message.c
@@ -0,0 +1,48 @@
+/* Internal test to verify __libc_fatal.
+   Copyright (C) 2025 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <signal.h>
+#include <stdio.h>
+
+#include <support/check.h>
+#include <support/capture_subprocess.h>
+
+static _Noreturn void
+run_libc_message (void *closure)
+{
+  /* We only support 4 arguments.  Call with 5 to trigger failure.  */
+  __libc_message_impl ("%s %s %s %s %s\n", "1", "2", "3", "4", "5");
+  __builtin_unreachable ();
+}
+
+static int
+do_test (void)
+{
+  struct support_capture_subprocess result
+    = support_capture_subprocess (run_libc_message, NULL);
+  support_capture_subprocess_check (&result, "libc_message", -SIGABRT,
+				    sc_allow_stderr);
+
+  TEST_COMPARE_STRING (result.err.buffer, IOVEC_MAX_ERR_MSG);
+
+  support_capture_subprocess_free (&result);
+
+  return 0;
+}
+
+#include <support/test-driver.c>