c++ - How to set environment variable using setenv -

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i trying set env variables using setenv function. unfortunately doesn't work expected. 

int setnewenvvariable(const std::string *varname, const std::string *value) {     setenv(varname->c_str(), value->c_str(), true);     return this->var_added; }

it seems work when wants. can change (replace) variable, doesn't changes. cannot add new variable @ all. have tried use putenv. didn't

i have found when doesn't change existed variable. when try add new variable nonexistent yet. after doesn't add new variable , in addition doesn't change existed variable ,but before trying add new variable worked.

i mean before trying add new var accepts changing of existent example path, after passing nonexistent variable path2323 , stops accept changing existed vars.

edit

i have checked return value 0 , errno 0........ wrong ?


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