Re: TMP/TEMP environment variable and /tmp

[Ken Brown <kbrown@cornell.edu>]

On 9/17/2020 7:58 PM, Doug Henderson via Cygwin wrote:
> On Thu, 17 Sep 2020 at 15:56, Ken Brown via Cygwin <> wrote:
>>
> 
> #include <stdio.h>
> #include <stdlib.h>
> int
> main ()
> {
>      char *temp_nam;
>      char *p_tmp_nam;
> 
>      printf ("$TMP      is '%s'\n", getenv ("TMP"));
>      printf ("$TMPDIR   is '%s'\n", getenv ("TMPDIR"));
>      printf ("$TEMP     is '%s'\n", getenv ("TEMP"));
>      printf ("P_tmpdir  is '%s'\n", P_tmpdir);
>      p_tmp_nam = tmpnam(0);
>      printf ("tmpnam()  is '%s'\n", p_tmp_nam);
>      temp_nam = tempnam(0, 0);
>      printf ("tempnam() is '%s'\n", temp_nam);
>      free(temp_nam);
> }
> 
> 
> # start a new shell
> $ sh
> $ TMP= TEMP= ./show_tmp
> $TMP      is ''
> $TMPDIR   is '(null)'
> $TEMP     is ''
> P_tmpdir  is '/tmp'
> tmpnam()  is '/tmp/t707.0'
> tempnam() is '/tmp/ffffd187.2'
> 
> # start cmd.exe
> $ /cygdrive/c/windows/system32/cmd.exe
> Microsoft Windows [Version 10.0.18363.1082]
> (c) 2019 Microsoft Corporation. All rights reserved.
>> set TMP=
>> set TEMP=
>> show_tmp
> $TMP      is '(null)'
> $TMPDIR   is '(null)'
> $TEMP     is '(null)'
> P_tmpdir  is '/tmp'
> tmpnam()  is '/tmp/t709.0'
> tempnam() is '/tmp/ffffd189.2'
> 
> P_tmpdir is defined in <stdio.h>

Sorry, but I'm missing your point.  How is this related to Kristian's claim that 
Cygwin is changing the value of the TMP environment variable to "/tmp"?

Ken