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-rw-r--r--m4/pipe2.m418
1 files changed, 18 insertions, 0 deletions
diff --git a/m4/pipe2.m4 b/m4/pipe2.m4
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index 0000000..c081b44
--- /dev/null
+++ b/m4/pipe2.m4
@@ -0,0 +1,18 @@
+# pipe2.m4 serial 2
+dnl Copyright (C) 2009-2018 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])
+
+ AC_CHECK_FUNCS_ONCE([pipe2])
+ if test $ac_cv_func_pipe2 != yes; then
+ HAVE_PIPE2=0
+ fi
+])