X-Git-Url: https://git.cworth.org/git?p=tar;a=blobdiff_plain;f=m4%2Ffdopendir.m4;fp=m4%2Ffdopendir.m4;h=7282d4b063f187a215ae389370dac2f3c139cbde;hp=0000000000000000000000000000000000000000;hb=22f1eb8bc17e5be72dd23d42d6aaa60196ac22e6;hpb=00fa13ff3f2d5b6e2a94c5e948c38616ff7ad37a

diff --git a/m4/fdopendir.m4 b/m4/fdopendir.m4
new file mode 100644
index 0000000..7282d4b
--- /dev/null
+++ b/m4/fdopendir.m4
@@ -0,0 +1,38 @@
+# serial 3
+# See if we need to provide fdopendir.
+
+dnl Copyright (C) 2009-2010 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+# Written by Eric Blake.
+
+AC_DEFUN([gl_FUNC_FDOPENDIR],
+[
+  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+  AC_CHECK_FUNCS_ONCE([fdopendir])
+  if test $ac_cv_func_fdopendir = no; then
+    AC_LIBOBJ([openat-proc])
+    AC_LIBOBJ([fdopendir])
+    gl_REPLACE_DIRENT_H
+    HAVE_FDOPENDIR=0
+  else
+    AC_CACHE_CHECK([whether fdopendir works],
+      [gl_cv_func_fdopendir_works],
+      [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+#include <dirent.h>
+#include <fcntl.h>
+]], [int fd = open ("conftest.c", O_RDONLY);
+     if (fd < 0) return 2;
+     return !!fdopendir (fd);])],
+         [gl_cv_func_fdopendir_works=yes],
+         [gl_cv_func_fdopendir_works=no],
+         [gl_cv_func_fdopendir_works="guessing no"])])
+    if test "$gl_cv_func_fdopendir_works" != yes; then
+      REPLACE_FDOPENDIR=1
+      gl_REPLACE_DIRENT_H
+      AC_LIBOBJ([fdopendir])
+    fi
+  fi
+])