Re: [TCLCORE] RE: TIP#210: Add 'tempname' Subcommand to 'file'

[Reinhard M. <ma...@tc...>]

Hi,

On Tue, 17 Jan 2006 at 14:23, Techentin, Robert W. wrote:

> [...] But, you can't ever get the file name back from the open file 
> handle.

if that was true, how would you ever be able to unlink() a file that 
was generated by mkstemp() when you don't need it anymore?

The version of the mkstemp() manpage I have at hand says that the file 
name is returned by overwriting the X'es in the template string you 
pass to it:

--- snip ---
DESCRIPTION
       The mkstemp() function generates a unique temporary file name
       from template.  The last six characters of template  must  be
       XXXXXX  and  these  are replaced with a string that makes the
       filename  unique.  The  file  is  then  created   with   mode
       read/write  and  permissions  0666 (glibc 2.0.6 and earlier),
       0600 (glibc 2.0.7 and later).  Since  it  will  be  modified,
       template  must  not  be  a  string  constant,  but  should be
       declared as a character array.  The file is opened  with  the
       O_EXCL  flag, guaranteeing that when mkstemp returns success-
       fully we are the only user.
--- snap ---

So I see no reason for not using mkstemp(), and in fact it is being 
used internally by the Tcl core already. See TclpCreateTempFile() and 
TclpTempFileName() in unix/tclUnixPipe.c .

cu
	Reinhard