Implement os.environ() on Linux

[greenm01]

Please implement this function on Linux.

Right now it only works on Windows?

[jasonKercher]

If that is a libc function, you can foreign link to it. Otherwise, if you just need access to the environment, this will get it for you:

#no_bounds_check env: [^]cstring = &runtime.args__[len(runtime.args__) + 1]

[greenm01]

#no_bounds_check env: [^]cstring = &runtime.args__[len(runtime.args__) + 1]

Thanks for this tip. I was binding to C to get the same functionality.

os.environ() is listed in the core package documentation and was a bit confusing at first as to why it was not working.

Cheers!

[greenm01]

One other question:

What's the smartest way to convert a [^]cstring to a []string?

[laytan]

This is what I would do:

#no_bounds_check env: [^]cstring = &runtime.args__[len(runtime.args__) + 1]

length: int
for ; env[length] != nil; length += 1 {}

env_strs := make([]string, length)
for &env_str, i in env_strs {
	env_str = string(env[i])
}

[greenm01]

This is what I would do:

Awesome, it works with no segfault. Thanks!

[jasonKercher]

Just to be clear, this method will not see modifications to the environment if done via libc. I believe setenv/putenv (whatever its called) will copy the entire thing to a fresh buffer on the first modification. What that little trick does is just access the environment that was passed to execve when your process was first launched.