Imported Upstream version 1.3.14

[debian/gzip] / m4 / dup2.m4

diff --git a/m4/dup2.m4 b/m4/dup2.m4
new file mode 100644 (file)
index 0000000..a74e915
--- /dev/null
+++ b/m4/dup2.m4
@@ -0,0 +1,58 @@
+#serial 9
+dnl Copyright (C) 2002, 2005, 2007, 2009 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.
+
+AC_DEFUN([gl_FUNC_DUP2],
+[
+  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+  AC_REQUIRE([AC_CANONICAL_HOST])
+  AC_CHECK_FUNCS_ONCE([dup2])
+  if test $ac_cv_func_dup2 = no; then
+    HAVE_DUP2=0
+    AC_LIBOBJ([dup2])
+  else
+    AC_CACHE_CHECK([whether dup2 works], [gl_cv_func_dup2_works],
+      [AC_RUN_IFELSE([
+         AC_LANG_PROGRAM([[#include <unistd.h>
+#include <errno.h>]],
+           [if (dup2 (1, 1) == 0)
+              return 1;
+            close (0);
+            if (dup2 (0, 0) != -1)
+              return 2;
+            /* Many gnulib modules require POSIX conformance of EBADF.  */
+            if (dup2 (1, 1000000) == -1 && errno != EBADF)
+              return 3;
+            return 0;
+           ])
+        ],
+       [gl_cv_func_dup2_works=yes], [gl_cv_func_dup2_works=no],
+       [case "$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;;
+          *) gl_cv_func_dup2_works=yes;;
+        esac])
+      ])
+    if test "$gl_cv_func_dup2_works" = no; then
+      gl_REPLACE_DUP2
+    fi
+  fi
+  AC_DEFINE_UNQUOTED([REPLACE_DUP2], [$REPLACE_DUP2],
+    [Define to 1 if dup2 returns 0 instead of the target fd.])
+])
+
+AC_DEFUN([gl_REPLACE_DUP2],
+[
+  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+  REPLACE_DUP2=1
+  AC_LIBOBJ([dup2])
+])