pipe: Set errno upon failure.

[gnulib.git] / m4 / sys_ioctl_h.m4

diff --git a/m4/sys_ioctl_h.m4 b/m4/sys_ioctl_h.m4
index bf54a42..8ba01e5 100644 (file)
--- a/m4/sys_ioctl_h.m4
+++ b/m4/sys_ioctl_h.m4
@@ -1,4 +1,4 @@
-# sys_ioctl_h.m4 serial 4
+# sys_ioctl_h.m4 serial 6
 dnl Copyright (C) 2008-2010 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -33,6 +33,15 @@ AC_DEFUN([gl_SYS_IOCTL_H],
   AC_SUBST([HAVE_SYS_IOCTL_H])
   dnl <sys/ioctl.h> is always overridden, because of GNULIB_POSIXCHECK.
   gl_CHECK_NEXT_HEADERS([sys/ioctl.h])
+
+  dnl Check for declarations of anything we want to poison if the
+  dnl corresponding gnulib module is not in use.
+  gl_WARN_ON_USE_PREPARE([[#include <sys/ioctl.h>
+/* Some platforms declare ioctl in the wrong header.  */
+#ifndef __GLIBC__
+# include <unistd.h>
+#endif
+    ]], [ioctl])
 ])
 
 dnl Unconditionally enables the replacement of <sys/ioctl.h>.
@@ -47,6 +56,8 @@ AC_DEFUN([gl_SYS_IOCTL_MODULE_INDICATOR],
   dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
   AC_REQUIRE([gl_SYS_IOCTL_H_DEFAULTS])
   GNULIB_[]m4_translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=1
+  dnl Define it also as a C macro, for the benefit of the unit tests.
+  gl_MODULE_INDICATOR([$1])
 ])
 
 AC_DEFUN([gl_SYS_IOCTL_H_DEFAULTS],