Re: mkstemp

[Reuben Thomas <rrt@...>]

On Sat, 15 Apr 2006, Christian Vogler wrote:

> > tmpfile() is a better option; it's defined to do this stuff *for* you, so
> > you don't have to, and risk getting it wrong.
>
> Problem is that in some libraries it does not. :-(
>
> So, what can one do?

One can use functions that are well-defined, and re-use well-written 
implementations from open source libraries where necessary and possible.

I suggest the following simplification of the Lua I/O library:

1. io.tmpfile should use umask on POSIX systems to get proper 
permissions (as mkstemp does).

2. io.tmpfile should return the name as a second return value, so that 
you can have:

function io.tmpname ()
  local _, name = io.tmpfile ()
  return name
end

if you really must.

3. io.tmpname should be removed. On a multi-tasking system it's bogus, 
and its use should be discouraged; on a single-tasking system it can be 
replaced if it really must be, as above.

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