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Posted to users@httpd.apache.org by ob...@arcor.de on 2016/03/17 20:38:33 UTC

[users@httpd] Environment variable set by "apr_env_set()" not accesible by C function "getenv()" within CGI program

Hi,

I have an Apache modul where I set an environment variable:

apr_env_set("FOO", "BAR", ...);

This variable is accesible by PHP:

<?php
    print(getenv("FOO")); // --> BAR
?>

but not by a simple CGI program written in C:

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char* argv[]) {
    printf("Content-Type: text/html;charset=utf-8\n\n");
    printf("%s", getenv("FOO")); /* --> NULL */
    return 0;
}

Other (standard) server variables like SERVER_NAME are accesible.

Apache Version 2.2.

Many thanks in advance.

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Re: [users@httpd] Environment variable set by "apr_env_set()" not accesible by C function "getenv()" within CGI program

Posted by ob...@arcor.de.
On Thu, Mar 17, 2016 at 8:47 PM, Eric Covener wrote:
> On Thu, Mar 17, 2016 at 3:38 PM,  <ob...@arcor.de> wrote:
>> Hi,
>>
>> I have an Apache modul where I set an environment variable:
>>
>> apr_env_set("FOO", "BAR", ...);
>>
>> This variable is accesible by PHP:
>>
>> <?php
>>     print(getenv("FOO")); // --> BAR
>> ?>
>>
>> but not by a simple CGI program written in C:
>>
>> #include <stdio.h>
>> #include <stdlib.h>
>
> The environment used for a CGI is not the environment of httpd.  You
> can modify it by adding entries to r->subprocess_env.
>
> Only some very specific vars are copied from httpds environment to the
> CGI, + the subprocess_env entries.
> --
> Eric Covener
> covener@gmail.com
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
> For additional commands, e-mail: users-help@httpd.apache.org

Hi,

many thanks.

apr_table_setn(r->subprocess_env, "FOO", "BAR")

works perfectly.

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Re: [users@httpd] Environment variable set by "apr_env_set()" not accesible by C function "getenv()" within CGI program

Posted by Eric Covener <co...@gmail.com>.
On Thu, Mar 17, 2016 at 3:38 PM,  <ob...@arcor.de> wrote:
> Hi,
>
> I have an Apache modul where I set an environment variable:
>
> apr_env_set("FOO", "BAR", ...);
>
> This variable is accesible by PHP:
>
> <?php
>     print(getenv("FOO")); // --> BAR
> ?>
>
> but not by a simple CGI program written in C:
>
> #include <stdio.h>
> #include <stdlib.h>

The environment used for a CGI is not the environment of httpd.  You
can modify it by adding entries to r->subprocess_env.

Only some very specific vars are copied from httpds environment to the
CGI, + the subprocess_env entries.
-- 
Eric Covener
covener@gmail.com

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