7537 – `File.tmpfile` requires administrator rights on Windows

---
import std.stdio;
void main() {
 File.tmpfile();
}
---
dmd 2.058 compiled version running from non-administrator fails with: std.exception.ErrnoException Could not create temporary file with tmpfile() (Permission denied) at std\stdio.d(875)

File.tmpfile is just a simple wrapper around core.stdc.stdio.tmpfile, so the issue is with the DMC's C standard library.

This is not a bug. It works as intended. Should close.

What?? How is this not a bug?

(In reply to comment #3)
> What?? How is this not a bug?
The OS prevents to create the file, so tmpfile() throws an exception. I don't see how this can be considered a bug.

The filename is chosen by the C runtime, not the operating system. It is a bug in the DigitalMars C runtime. It probably tries to use the hard-coded %WINDIR%\Temp directory, instead of the user profile directory or %TEMP%.

Oh, I just saw the author of the issue. It's not "random Denis".
Anyway, has a bug report been done in DMC C bugzilla ?
Else this one will stay open forever, I'm affraid.

(In reply to comment #5)
> The filename is chosen by the C runtime, not the operating system. It is a bug
> in the DigitalMars C runtime. It probably tries to use the hard-coded
> %WINDIR%\Temp directory, instead of the user profile directory or %TEMP%.
Actually, it uses stdio.h's _P_tmpdir, which on Windows is "\\". Did I say that implementation is rather old? I also noticed that Windows 7 does not allow writing to the root directory. XP allowed it.

(In reply to comment #7)
> XP allowed it.
You mean, to administrator users? I don't think regular users can create files in the drive root on XP either:
http://dump.thecybershadow.net/2d089ee536e35b4a8244f26f36be491c/00000814.png 

I have it fixed in snn.lib now. You can pick it up here:
ftp://ftp.digitalmars.com/dmc.zip 

(In reply to comment #3)
> What?? How is this not a bug?
I may have been wrong here. The problem is not present on Win32, but on Win64 the MS runtime does what the DMC runtime used to do - attempt to create the file in the drive root. And it's not a bug, it's working according to the documentation:
> The tmpfile function creates a temporary file and returns a pointer to that 
> stream. The temporary file is created in the root directory. To create a 
> temporary file in a directory other than the root, use tmpnam or tempnam in 
> conjunction with fopen.
Conclusion: this function is horrible and needs to be replaced with something better.
Some relevant discussion here:
https://github.com/D-Programming-Language/phobos/pull/691 

Is this still not fixed?

THIS ISSUE HAS BEEN MOVED TO GITHUB
https://github.com/dlang/phobos/issues/9923
DO NOT COMMENT HERE ANYMORE, NOBODY WILL SEE IT, THIS ISSUE HAS BEEN MOVED TO GITHUB