Creates a temporary file of mode 0600 in the temporary directory, opens it with mode “w+”, and returns a Tempfile object which represents the created temporary file. A Tempfile object can be treated just like a normal File object.
The basename parameter is used to determine the name of a temporary file. If an Array is given, the first element is used as prefix string and the second as suffix string, respectively. Otherwise it is treated as prefix string.
If tmpdir is omitted, the temporary directory is determined by Dir::tmpdir provided by ‘tmpdir.rb’. When $SAFE > 0 and the given tmpdir is tainted, it uses /tmp. (Note that ENV values are tainted by default)
# File lib/tempfile.rb, line 30 def initialize(basename, tmpdir=Dir::tmpdir) if $SAFE > 0 and tmpdir.tainted? tmpdir = '/tmp' end lock = nil n = failure = 0 begin Thread.critical = true begin tmpname = File.join(tmpdir, make_tmpname(basename, n)) lock = tmpname + '.lock' n += 1 end while @@cleanlist.include?(tmpname) or File.exist?(lock) or File.exist?(tmpname) Dir.mkdir(lock) rescue failure += 1 retry if failure < MAX_TRY raise "cannot generate tempfile `%s'" % tmpname ensure Thread.critical = false end @data = [tmpname] @clean_proc = Tempfile.callback(@data) ObjectSpace.define_finalizer(self, @clean_proc) @tmpfile = File.open(tmpname, File::RDWR|File::CREAT|File::EXCL, 0600) @tmpname = tmpname @@cleanlist << @tmpname @data = @tmpfile @data = @@cleanlist super(@tmpfile) # Now we have all the File/IO methods defined, you must not # carelessly put bare puts(), etc. after this. Dir.rmdir(lock) end