Lennart Poettering
5863f1da42
If PAMName= is used we'll spawn a PAM session for the service, and leave a process around that closes the PAM session eventually. That process must close the "exec_fd" that we use to implement Type=exec. After all the logic relies on the fact that execve() will implicitly close the exec_fd, and the EOF seen on it is hence indication for the service manager that execve() has worked. But if we keep an fd open in the PAM service process, then this is not going to work. Hence close the fd explicitly so that it definitely doesn't stay pinned in the child.
System and Service Manager
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