On 2026-03-22 04:11:52 +0100, Vincent Lefevre wrote: > LD_PRELOAD is not set with Fvwm 2 / Fvwm 3 / Sawfish / Twm: in > a terminal, "env | grep LD_PRELOAD" does not output anything.
The purpose of /usr/lib/environment.d is not clear. The environment.d(5) man page says in "DESCRIPTION": Configuration files in the environment.d/ directories contain lists of environment variable assignments passed to services started by the systemd user instance. And in "APPLICABILITY": Environment variables exported by the user service manager (systemd --user instance started in the [email protected] system service) are passed to any services started by that service manager. In particular, this may include services which run user shells. For example in the GNOME environment, the graphical terminal emulator runs as the gnome-terminal-server.service user unit, which in turn runs the user shell, so that shell will inherit environment variables exported by the user manager. For other instances of the shell, not launched by the user service manager, the environment they inherit is defined by the program that starts them. Hint: in general, systemd.service(5) units contain programs launched by systemd, and systemd.scope(5) units contain programs launched by something else. So, in short, /usr/lib/environment.d is not guaranteed to be taken into account. In particular, in the case of FVWM, it is not the systemd user instance that starts applications. Later: Specifically, for ssh logins, the sshd(8) service builds an environment that is a combination of variables forwarded from the remote system and defined by sshd, see the discussion in ssh(1). A graphical display session will have an analogous mechanism to define the environment. Note that some managers query the systemd user instance for the exported environment and inject this configuration into programs they start, using `systemctl show-environment` or the underlying D-Bus call. So, again this is not guaranteed to be taken into account. BTW, on my machine, "systemctl show-environment" just gives LANG=C.UTF-8 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin So the LD_PRELOAD=libgtk-nocsd.so.0${LD_PRELOAD:+:$LD_PRELOAD} setting in /usr/lib/environment.d/50-gtk-nocsd.conf is not taken into account. /etc/environment remains more general (it is mentioned in various files under /etc/pam.d, but the other directories from the environment.d(5) man page aren't). -- Vincent Lefèvre <[email protected]> - Web: <https://www.vinc17.net/> 100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/> Work: CR INRIA - computer arithmetic / Pascaline project (LIP, ENS-Lyon)
