Re: pass enviornment variables to popen

From: wally (root_at_localhost.localdomain)
Date: 01/30/05 

Date: Sun, 30 Jan 2005 12:20:19 -0500

sam wrote:

> Hi,
>
> How can I pass enviornment variables to popen() in C?
> I want to do something like this:
> setenv("KEY_CONF", "/usr/local/etc/ssl/conf/openssl.conf", 1);
> popen("openssl <some commandline args> $KEY_CONF", "w");
>
> But the above enviornment variable get removed in calling popen().
> Unless I rewrite popen(), I don't see I can pass the enviornment
> variables to popen().
>
>
> Sam.

why not try something along the lines of:

setenv("KEY_CONF", "/usr/local/etc/ssl/conf/openssl.conf", 1);
...
char *key_conf=getenv("KEY_CONF");
char pipe_command[255];

//although you should probably restrict the size of that array to avoid out
//of bounds in case the KEY_CONF is set to something so big that it wont fit
//here so you can try something along the lines of:
//*pipe_command=malloc(sizeof("openssl <some commandline args> ") + sizeof
(&key_conf));

sprintf(pipe_command("openssl <some commandline args> %s", pipe_command);
pipe_fp=popen(pipe_command, "w"); 

-- 
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