X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fftruncate.m4;h=4a47ba4297a1f020c97392f9deef233e357f1cc0;hb=f91a52116057e8f56e1af7dd58b2ded6274d60e5;hp=473fde210f602b95d9e0cb36ca4862bcf531f827;hpb=a965c0038c4b72af2497d3ec44aeb4587c2478d5;p=gnulib.git

diff --git a/m4/ftruncate.m4 b/m4/ftruncate.m4
index 473fde210..4a47ba429 100644
--- a/m4/ftruncate.m4
+++ b/m4/ftruncate.m4
@@ -1,27 +1,24 @@
-#serial 2
+# serial 18
 
-# See if we need to emulate a missing ftruncate function using fcntl.
+# See if we need to emulate a missing ftruncate function using chsize.
 
-AC_DEFUN(jm_FUNC_FTRUNCATE,
-[
-  AC_CHECK_FUNCS(ftruncate, , [ftruncate_missing=yes])
+# Copyright (C) 2000-2001, 2003-2007, 2009-2011 Free Software Foundation, Inc.
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
 
-  if test "$ftruncate_missing" = yes; then
-    AC_CHECK_HEADERS(unistd.h)
-    AC_MSG_CHECKING([fcntl emulation of ftruncate])
-    AC_CACHE_VAL(fu_cv_sys_ftruncate_emulation,
-    [AC_TRY_LINK([
-#include <sys/types.h>
-#include <fcntl.h>], [
-#if !defined(F_CHSIZE) && !defined(F_FREESP)
-  chsize();
-#endif
-  ],
-      fu_cv_sys_ftruncate_emulation=yes,
-      fu_cv_sys_ftruncate_emulation=no)])
-    AC_MSG_RESULT($fu_cv_sys_ftruncate_emulation)
-    if test $fu_cv_sys_ftruncate_emulation = yes; then
-      AC_LIBOBJ([ftruncate])
-    fi
+AC_DEFUN([gl_FUNC_FTRUNCATE],
+[
+  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+  AC_CHECK_FUNCS_ONCE([ftruncate])
+  if test $ac_cv_func_ftruncate = no; then
+    HAVE_FTRUNCATE=0
   fi
 ])
+
+# Prerequisites of lib/ftruncate.c.
+AC_DEFUN([gl_PREREQ_FTRUNCATE],
+[
+  AC_REQUIRE([AC_C_INLINE])
+  AC_CHECK_FUNCS([chsize])
+])