(gl_GETADDRINFO): Look for getservbyname in these

[gnulib.git] / m4 / readdir.m4

diff --git a/m4/readdir.m4 b/m4/readdir.m4
index c73c156..7783ef0 100644 (file)
--- a/m4/readdir.m4
+++ b/m4/readdir.m4
@@ -1,25 +1,40 @@
-#serial 1
-
-dnl FIXME: describe
-
-AC_DEFUN(jm_FUNC_READDIR,
+#serial 8
+
+# Copyright (C) 1997, 1999, 2000, 2001, 2002, 2003 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.
+
+dnl SunOS's readdir is broken in such a way that rm.c has to add extra code
+dnl to test whether a NULL return value really means there are no more files
+dnl in the directory.
+dnl
+dnl And the rm from coreutils-5.0 exposes a similar problem when there
+dnl are 338 or more files in a directory on a Darwin-6.5 system
+dnl
+dnl Detect the problem by creating a directory containing 500 files (254 not
+dnl counting . and .. is the minimum for SunOS, 338 for Darwin) and see
+dnl if a loop doing `readdir; unlink' removes all of them.
+dnl
+dnl Define HAVE_WORKING_READDIR if readdir does *not* have this problem.
+
+dnl Written by Jim Meyering.
+
+AC_DEFUN([GL_FUNC_READDIR],
 [dnl
 AC_REQUIRE([AC_HEADER_DIRENT])
-AC_CHECK_HEADERS(string.h)
-AC_CACHE_CHECK([for working readdir], jm_cv_func_working_readdir,
+AC_CACHE_CHECK([for working readdir], gl_cv_func_working_readdir,
   [dnl
   # Arrange for deletion of the temporary directory this test creates, in
   # case the test itself fails to delete everything -- as happens on Sunos.
   ac_clean_files="$ac_clean_files conf-dir"
 
   AC_TRY_RUN(
-  changequote(<<, >>)dnl
-  <<
-#   include <stdio.h>
+[#   include <stdio.h>
 #   include <sys/types.h>
-#   if HAVE_STRING_H
-#    include <string.h>
-#   endif
+#   include <string.h>
 
 #   ifdef HAVE_DIRENT_H
 #    include <dirent.h>
@@ -42,17 +57,20 @@ AC_CACHE_CHECK([for working readdir], jm_cv_func_working_readdir,
      (Basename[0] == '.' && (Basename[1] == '\0' \
                             || (Basename[1] == '.' && Basename[2] == '\0')))
 
+/* Don't try to use replacement mkdir; it wouldn't resolve at link time.  */
+#   undef mkdir
+
     static void
-    create_300_file_dir (const char *dir)
+    create_N_file_dir (const char *dir, size_t n_files)
     {
-      int i;
+      unsigned int i;
 
       if (mkdir (dir, 0700))
        abort ();
       if (chdir (dir))
        abort ();
 
-      for (i = 0; i < 300; i++)
+      for (i = 0; i < n_files; i++)
        {
          char file_name[4];
          FILE *out;
@@ -106,26 +124,16 @@ AC_CACHE_CHECK([for working readdir], jm_cv_func_working_readdir,
     main ()
     {
       const char *dir = "conf-dir";
-      create_300_file_dir (dir);
+      create_N_file_dir (dir, 500);
       remove_dir (dir);
       exit (0);
-    }
-  >>,
-  changequote([, ])dnl
-  jm_cv_func_working_readdir=yes,
-  jm_cv_func_working_readdir=no,
-  jm_cv_func_working_readdir=no)])
-
-  if test x = y; then
-    dnl This code is deliberately never run via ./configure.
-    dnl FIXME: this is a gross hack to make autoheader put an entry
-    dnl for this HAVE_-prefixed symbol in config.h.in.
-    AC_CHECK_FUNCS(WORKING_READDIR)
-  fi
-
-
-  if test $jm_cv_func_working_readdir = yes; then
-    ac_kludge=HAVE_WORKING_READDIR
-    AC_DEFINE_UNQUOTED($ac_kludge)
+    }],
+  gl_cv_func_working_readdir=yes,
+  gl_cv_func_working_readdir=no,
+  gl_cv_func_working_readdir=no)])
+
+  if test $gl_cv_func_working_readdir = yes; then
+    AC_DEFINE(HAVE_WORKING_READDIR, 1,
+      [Define if readdir is found to work properly in some unusual cases. ])
   fi
 ])