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Request #52074 RFE: tempdir() countrpart to tempnam()
Submitted: 2010-06-13 02:57 UTC Modified: 2021-08-27 15:51 UTC
Votes:2
Avg. Score:3.5 ± 0.5
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:0 (0.0%)
From: php at richardneill dot org Assigned: cmb (profile)
Status: Wont fix Package: Directory function related
PHP Version: Irrelevant OS:
Private report: No CVE-ID: None
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 [2010-06-13 02:57 UTC] php at richardneill dot org 
Description:
------------
It would be really useful to have the ability to create a tempdir, with a 
unique name, which we know we can write to, and will be automatically cleaned 
up.

For example, if I want to run an external command (with exec() ) which will 
write to a file, where:

  - it must be known that file-creation can succeed
  - the file does not exist at the moment


Test script:
---------------
Some applications will refuse to overwrite an existing file (that we created with tempnam()), because they don't want to clobber it. What we effectively need is a race-free way to assign a temp-filename without actually creating the file.  Using tmpfile() doesn't help, because we can't pass a file-handle to php's exec().

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 [2013-10-30 10:26 UTC] phpbugs at canavan dot de 
An alternative would be to add a flag to tempnam(), e.g. tempnam ( string $dir , string $prefix, bool $create_a_directory ).
 [2021-08-27 15:51 UTC] cmb@php.net
-Status: Open +Status: Wont fix -Assigned To: +Assigned To: cmb
 [2021-08-27 15:51 UTC] cmb@php.net 
> What we effectively need is a race-free way to assign a
> temp-filename without actually creating the file.

How would that be possible in the general case?  Even tempnam(3)
is not without race-condition; a function that would return the
name of a temporary directory, is as well.

Given that this rather doubtful request had not much traction for
more than ten years, I'm closing as WONTFIX.

Feel free to pursue the RFC process[1], if you want to see this
feature implemented.

[1] <https://wiki.php.net/rfc/howto>
 
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