NAME

       lei-daemon - technical information for local email interface daemon

DESCRIPTION

       This documentation is a high-level overview for developers and administrators interested in how lei
       works.

       lei-daemon is a background daemon which powers the lei(1) command-line tool.  It may support virtual
       users and read-write IMAP+JMAP APIs in the future.  It is designed to optimize shell completion by
       avoiding module loading costs, monitor Maildirs (and in the near future, IMAP folders) for changes.

   worker processes
       Most commands cause lei-daemon to fork(2) new worker processes to isolate and parallelize work.  lei-
       daemon is significantly more aggressive than read-only public-inbox-daemon(8) processes with regards to
       resource use since it's not designed to support C10K/C100K scenarios.

   file descriptor passing
       FD passing is used to reduce IPC costs for bulk I/O when importing large mboxes from stdin and dumping
       large mboxes to stdout.

   SOCK_SEQPACKET
       SOCK_SEQPACKET sockets are used for both communicating with lei(1) and to internal workers.
       SOCK_SEQPACKET guarantees reliability (unlike SOCK_DGRAM), allows easy load distribution, and saves
       developers the trouble of maintaining stream parsers.

   file monitoring
       Inotify or EVFILT_VNODE is used depending on the platform to monitor Maildirs for changes and track
       keyword changes.

       The listen socket (default: "$XDG_RUNTIME_DIR/lei/5.seq.sock") is also monitored, and the daemon will
       automatically shutdown if it is unlinked.

CONTACT

       Feedback welcome via plain-text mail to <mailto:meta@public-inbox.org>

       The mail archives are hosted at <https://public-inbox.org/meta/> and
       <http://4uok3hntl7oi7b4uf4rtfwefqeexfzil2w6kgk2jn5z2f764irre7byd.onion/meta/>

COPYRIGHT

       Copyright all contributors <mailto:meta@public-inbox.org>

       License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>

SEE ALSO

       lei-overview(7), lei-daemon-kill(1), lei-daemon-pid(1)