RE: [Axiom-developer] system::getenv does not return MSYS environ ment variables

[Page, Bill]

Camm,

On Tuesday, December 07, 2004 5:30 PM you replied:
> 
> "Page, Bill" <address@hidden> writes:
>> One of the external lib/cfunc.c routines is copyEnvValue which
>> calls the stdlib routine getenv(). A simple test program shows
>> that this gets both AXIOM and PATH variables properly. But it
>> is apparently no longer used in Axiom. I wonder what GCL is
>> calling of system::getenv?
> 
> This is just a wrapper around the C library getenv.  Does this
> not work on Windows?  Code is in main.c.
> 

Yes I see the code in main.c that implements system::getenv.
I am at a complete loss to explain following since apparently
both copyEnvValue.c in Axiom's lib/cfun-c.c *and* system::getenv
both call getenv from <stdlib>. Are there two different stdlib's??

What is observe is the following::

1) In Windows I go

     Start/Control Panel/System/Advanced/Enviroment Variables

   and I set an environment variable, say

     W1 c:/xxx/yyy

2) Then I start an MSYS shell. I can see the environment variable
   W1 from the shell

     echo $W1
     c:/xxx/yyy

3) Set another environment variable here in MSYS

     export M1=d:/www/zzz
     echo $M1
     d:/www/zzz

4) Start GCL (in my case it was AXIOMsys) and interrogate
   the environment variables

   (system::getenv "W1")
   "c:/xxx/yyy"

   (system::getenv "M1")
    NIL

   GCL doesn't see the MSYS environment variable.

 5) Write a simple C program that calls getenv directly

    # test.c
    #include <stdlib.h>
    #include <stdio.h>
    main () {
      fprintf(stdout,"W1=%s\n",getenv("W1"));
      fprintf(stdout,"M1=%s\n",getenv("M1"));
    }

    gcc test.c -o test
    test
    W1=c:/xxx/yyy
    M1=d:/www/zzz

    In this case the program sees both environment
    variables.

 6) Can you guess what happens if we use the same
    environment variable names in both Windows and
    in MSYS?

--------

Regards,
Bill Page.