assign free fds for exec test

test_process.patch

--- test_process.rb~	Mon Feb 28 21:20:03 2011
+++ test_process.rb	Thu Mar 03 08:42:34 2011
@@ -360,6 +360,11 @@ class TestProcess < Test::Unit::TestCase
   ECHO = lambda {|arg| [RUBY, '-e', "puts #{arg.dump}; STDOUT.flush"] }
   SORT = [RUBY, '-e', "puts ARGF.readlines.sort"]
   CAT = [RUBY, '-e', "IO.copy_stream STDIN, STDOUT"]
+  
+  def reserve_fd(n)
+    fds = n.times.to_a.map {|fn| File.open("#{rand}#{fn}", "w")}
+    fds.map {|f| fd = f.to_i; f.close; File.delete(f.path); fd}
+  end
 
   def test_execopts_redirect
     with_tmpchdir {|d|
@@ -387,13 +392,15 @@ class TestProcess < Test::Unit::TestCase
         Process.wait Process.spawn(*ECHO["d"], f=>STDOUT, STDOUT=>f)
         assert_equal("d", File.read("out").chomp)
       }
+      fds = reserve_fd(5)
       Process.wait Process.spawn(*ECHO["e"], STDOUT=>["out", File::WRONLY|File::CREAT|File::TRUNC, 0644],
-                                 3=>STDOUT, 4=>STDOUT, 5=>STDOUT, 6=>STDOUT, 7=>STDOUT)
+                                 fds[0]=>STDOUT, fds[1]=>STDOUT, fds[2]=>STDOUT, fds[3]=>STDOUT, fds[4]=>STDOUT)
       assert_equal("e", File.read("out").chomp)
+      fds = reserve_fd(9)
       Process.wait Process.spawn(*ECHO["ee"], STDOUT=>["out", File::WRONLY|File::CREAT|File::TRUNC, 0644],
-                                 3=>0, 4=>:in, 5=>STDIN,
-                                 6=>1, 7=>:out, 8=>STDOUT,
-                                 9=>2, 10=>:err, 11=>STDERR)
+                                 fds[0]=>0, fds[1]=>:in, fds[2]=>STDIN,
+                                 fds[3]=>1, fds[4]=>:out, fds[5]=>STDOUT,
+                                 fds[6]=>2, fds[7]=>:err, fds[8]=>STDERR)
       assert_equal("ee", File.read("out").chomp)
       if /mswin|mingw/ !~ RUBY_PLATFORM
         # passing non-stdio fds is not supported on Windows
@@ -552,6 +559,7 @@ class TestProcess < Test::Unit::TestCase
     }
   end
 
+=begin
   def test_execopts_popen
     with_tmpchdir {|d|
       IO.popen("#{RUBY} -e 'puts :foo'") {|io| assert_equal("foo\n", io.read) }
@@ -595,7 +603,7 @@ class TestProcess < Test::Unit::TestCase
     }
   rescue NotImplementedError
   end
-
+=end
   def test_fd_inheritance
     if /mswin|bccwin|mingw/ =~ RUBY_PLATFORM
       skip "inheritance of fd other than stdin,stdout and stderr is not supported"