New module 'sys_ioctl'.

[gnulib.git] / m4 / sys_ioctl_h.m4

diff --git a/m4/sys_ioctl_h.m4 b/m4/sys_ioctl_h.m4
new file mode 100644 (file)
index 0000000..5488039
--- /dev/null
+++ b/m4/sys_ioctl_h.m4
@@ -0,0 +1,60 @@
+# sys_ioctl_h.m4 serial 1
+dnl Copyright (C) 2008 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.
+
+dnl Written by Bruno Haible.
+
+AC_DEFUN([gl_SYS_IOCTL_H],
+[
+  dnl Use AC_REQUIRE here, so that the default behavior below is expanded
+  dnl once only, before all statements that occur in other macros.
+  AC_REQUIRE([gl_SYS_IOCTL_H_DEFAULTS])
+
+  AC_CHECK_HEADERS_ONCE([sys/ioctl.h])
+  if test $ac_cv_header_sys_ioctl_h = yes; then
+    HAVE_SYS_IOCTL_H=1
+    dnl Test whether <sys/ioctl.h> declares ioctl(), or whether some other
+    dnl header file, such as <unistd.h> or <stropts.h>, is needed for that.
+    AC_CACHE_CHECK([whether <sys/ioctl.h> declares ioctl],
+      [gl_cv_decl_ioctl_in_sys_ioctl_h],
+      [AC_CHECK_DECL([ioctl],
+         [gl_cv_decl_ioctl_in_sys_ioctl_h=yes],
+         [gl_cv_decl_ioctl_in_sys_ioctl_h=no],
+         [#include <sys/ioctl.h>])
+      ])
+    if test $gl_cv_decl_ioctl_in_sys_ioctl_h != yes; then
+      SYS_IOCTL_H='sys/ioctl.h'
+    fi
+  else
+    HAVE_SYS_IOCTL_H=0
+    SYS_IOCTL_H='sys/ioctl.h'
+  fi
+  AC_SUBST([HAVE_SYS_IOCTL_H])
+  dnl Execute this unconditionally, because SYS_IOCTL_H may be set by other
+  dnl modules, after this code is executed.
+  gl_CHECK_NEXT_HEADERS([sys/ioctl.h])
+])
+
+dnl Unconditionally enables the replacement of <sys/ioctl.h>.
+AC_DEFUN([gl_REPLACE_SYS_IOCTL_H],
+[
+  AC_REQUIRE([gl_SYS_IOCTL_H_DEFAULTS])
+  SYS_IOCTL_H='sys/ioctl.h'
+])
+
+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
+])
+
+AC_DEFUN([gl_SYS_IOCTL_H_DEFAULTS],
+[
+  GNULIB_IOCTL=0;         AC_SUBST([GNULIB_IOCTL])
+  dnl Assume proper GNU behavior unless another module says otherwise.
+  SYS_IOCTL_H_HAVE_WINSOCK2_H=0; AC_SUBST([SYS_IOCTL_H_HAVE_WINSOCK2_H])
+  SYS_IOCTL_H='';                AC_SUBST([SYS_IOCTL_H])
+])