Re: TMP/TEMP environment variable and /tmp

[Ken Brown via Cygwin]

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
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