1 files changed, 23 insertions, 0 deletions
diff --git a/m4/pipe2.m4 b/m4/pipe2.m4
new file mode 100644
index 0000000..79de69c
--- /dev/null
+++ b/m4/pipe2.m4
@@ -0,0 +1,23 @@
+# pipe2.m4 serial 4
+dnl Copyright (C) 2009-2023 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_PIPE2],
+[
+  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+
+  dnl Persuade glibc <unistd.h> to declare pipe2().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+  gl_CHECK_FUNCS_ANDROID([pipe2], [[#include <unistd.h>]])
+  if test $ac_cv_func_pipe2 != yes; then
+    HAVE_PIPE2=0
+    case "$gl_cv_onwards_func_pipe2" in
+      future*) REPLACE_PIPE2=1 ;;
+    esac
+  else
+    REPLACE_PIPE2=1
+  fi
+])