function setenv(variable: String, value: String, overwrite: Boolean): Boolean {
    // Gjs wrapper for g_setenv()

Sets an environment variable. Both the variable's name and value should be in the GLib file name encoding. On UNIX, this means that they can be arbitrary byte strings. On Windows, they should be in UTF-8.

Note that on some systems, when variables are overwritten, the memory used for the previous variables and its value isn't reclaimed.

You should be mindful fo the fact that environment variable handling in UNIX is not thread-safe, and your program may crash if one thread calls GLib.setenv while another thread is calling getenv(). (And note that many functions, such as gettext(), call getenv() internally.) This function is only safe to use at the very start of your program, before creating any other threads (or creating objects that create worker threads of their own).

If you need to set up the environment for a child process, you can use GLib.get_environ to get an environment array, modify that with GLib.environ_setenv and GLib.environ_unsetenv, and then pass that array directly to execvpe(), GLib.spawn_async, or the like.

Since 2.4


the environment variable to set, must not contain '='.


the value for to set the variable to.


whether to change the variable if it already exists.


false if the environment variable couldn't be set.