On UNIX, the name and value are byte strings which might or might not
be in some consistent character set and encoding. On Windows, they are
in UTF-8.
On Windows, in case the environment variable's value contains
references to other environment variables, they are expanded.
the value of the environment variable, or NULL if
the environment variable is not found. The returned string
may be overwritten by the next call to g_getenv(), g_setenv()
or g_unsetenv().
Returns the value of an environment variable.
On UNIX, the name and value are byte strings which might or might not be in some consistent character set and encoding. On Windows, they are in UTF-8. On Windows, in case the environment variable's value contains references to other environment variables, they are expanded.