How to set environment variable using setenv

Asked Dec 05 '14 at 23:30

Active Jul 13 '15 at 15:14

Viewed 1,498 times

I am trying to set env variables using setenv function. But unfortunately it doesn't work as 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 to work only when it wants. Sometimes I can change (replace) variable, but than it doesn't do any changes. I cannot add new variable at all. I have tried to use putenv. But it didn't help

I have found when it doesn't change existed variable. When I try to add new variable nonexistent yet. after this it doesn't add new variable , but in addition it doesn't change existed variable ,but before trying to add new variable everything worked.

I mean that before trying to add new var it accepts changing of existent for example PATH, but after passing nonexistent variable like PATH2323 , it stops to accept changing existed vars.

EDIT

I have checked return value it is 0 and errno also 0........ What is wrong with it ?

edited Jul 13 '15 at 15:14

Yu Hao

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asked Dec 05 '14 at 23:30

ahguobrf

1

If `setenv()` is mis-behaving, report its return value. What is it? IOW, does it work when the return value is 0 and fail when return value is non-zero? – chux - Reinstate Monica Dec 05 '14 at 23:35
5

Can you write a runnable test case that shows the problem? – that other guy Dec 05 '14 at 23:54
1

Are you expecting the environment variable to change in your shell, or just the process? For example, are you trying to change PATH and expect that when the program exits, the PATH in your shell will change? I don't think `setenv()` can do that. – JS1 Dec 06 '14 at 00:42
this is not C code, so the C tag should be removed – user3629249 Dec 06 '14 at 01:43
1

this is a duplicate of: – user3629249 Dec 06 '14 at 01:45

How to set environment variable using setenv

0 Answers0