Elide non-DFSG compliant upstream components

[debian/tar] / m4 / dup2.m4

diff --git a/m4/dup2.m4 b/m4/dup2.m4
index 054982359e8797502185fdd66064a47c7d3eedfd..def263b87a85b7ccd38e0c539f894718817a75c9 100644 (file)
--- a/m4/dup2.m4
+++ b/m4/dup2.m4
@@ -1,5 +1,5 @@
-#serial 5
-dnl Copyright (C) 2002, 2005, 2007 Free Software Foundation, Inc.
+#serial 12
+dnl Copyright (C) 2002, 2005, 2007, 2009-2011 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.
@@ -7,9 +7,64 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_FUNC_DUP2],
 [
   AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
-  AC_CHECK_FUNCS_ONCE([dup2])
+  AC_REQUIRE([AC_CANONICAL_HOST])
+  AC_CHECK_FUNCS_ONCE([dup2 fcntl])
   if test $ac_cv_func_dup2 = no; then
     HAVE_DUP2=0
     AC_LIBOBJ([dup2])
+  else
+    AC_CACHE_CHECK([whether dup2 works], [gl_cv_func_dup2_works],
+      [AC_RUN_IFELSE([
+         AC_LANG_PROGRAM([[#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>]],
+           [int result = 0;
+#if HAVE_FCNTL
+            if (fcntl (1, F_SETFD, FD_CLOEXEC) == -1)
+              result |= 1;
+#endif HAVE_FCNTL
+            if (dup2 (1, 1) == 0)
+              result |= 2;
+#if HAVE_FCNTL
+            if (fcntl (1, F_GETFD) != FD_CLOEXEC)
+              result |= 4;
+#endif
+            close (0);
+            if (dup2 (0, 0) != -1)
+              result |= 8;
+            /* Many gnulib modules require POSIX conformance of EBADF.  */
+            if (dup2 (2, 1000000) == -1 && errno != EBADF)
+              result |= 16;
+            return result;
+           ])
+        ],
+        [gl_cv_func_dup2_works=yes], [gl_cv_func_dup2_works=no],
+        [case "$host_os" in
+           mingw*) # on this platform, dup2 always returns 0 for success
+             gl_cv_func_dup2_works=no;;
+           cygwin*) # on cygwin 1.5.x, dup2(1,1) returns 0
+             gl_cv_func_dup2_works=no;;
+           linux*) # On linux between 2008-07-27 and 2009-05-11, dup2 of a
+                   # closed fd may yield -EBADF instead of -1 / errno=EBADF.
+             gl_cv_func_dup2_works=no;;
+           freebsd*) # on FreeBSD 6.1, dup2(1,1000000) gives EMFILE, not EBADF.
+             gl_cv_func_dup2_works=no;;
+           haiku*) # on Haiku alpha 2, dup2(1, 1) resets FD_CLOEXEC.
+             gl_cv_func_dup2_works=no;;
+           *) gl_cv_func_dup2_works=yes;;
+         esac])
+      ])
+    if test "$gl_cv_func_dup2_works" = no; then
+      gl_REPLACE_DUP2
+    fi
   fi
 ])
+
+AC_DEFUN([gl_REPLACE_DUP2],
+[
+  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+  if test $ac_cv_func_dup2 = yes; then
+    REPLACE_DUP2=1
+  fi
+  AC_LIBOBJ([dup2])
+])