Well yes, Arie, you are right about that. I did find a clever/nasty (you
be the judge of that) solution for the problem. Simply write the
environment variable from within your application to a file, and then
"source" the file in your script. :-)
The script might look something like this:
[script]
#!/bin/sh
# create some environment variable 'EVR' and show it
EVR="your value"
echo $EVR
# run your C program, which changes EVR and exports it to
/tmp/evr.env
./your_c_program
# source the changed environment
source /tmp/evr.env
# now show the changed value
echo $EVR
# and exit the script.
exit 0
[/script]
In your C program, you would do something like this:
[snippet]
// Here, you change the environment variable
setenv("EVR", "my changed value", 1);
// Open a temp file to write the environment variable in
FILE *fh = fopen("/tmp/evr.env", "w+");
if (fh)
{
// This will write 'EVR="my changed value"' in the temp
file
fprintf(fh, "EVR=\"%s\"\n", getenv("EVR"));
fclose(fh);
}
[/snippet]
Regards,
Sander
-----Original Message-----
From: Arie de Muijnck [mailto:[email protected]]
Sent: Thursday, December 18, 2008 10:52 AM
To: Sander Huijsen; [email protected]
Subject: Re: A way to export from c an environment var
Unless one wants to set a persistant value, that can be used after
his/hers
process finishes...
Unfortunately functions like setenv(), putenv(), system("export ...")
change
only the current environment of the process itself, not the 'global'
environment of the user (let alone the system).
Regards,
Arie de Muijnck
----- Original Message -----
> You might want to try setenv(). Just type 'man 3 setenv' in a Linux
> shell to get the man-page for that function (which is in stdlib).
>
> Sander
>
>
> -----Original Message-----
> Hi,
>
> Is there a way to create and export from c an environment
> variable a bash
> script can be aware of? I intend something like PATH, etc.
>
> Thanks and Regards,
>
> VanVliet
>
> Dr. Caroline Van Vliet
> Adfl Group
> Advanced DSP Flexible Language Group
> Via Greto di Cornigliano 6R
> 16152 - Genova, Italy
> Tel. +39 010 8609370 - Fax +39 010 8609381
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