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* src/process.c (connect_network_socket): Allow a pre-allocated socket descriptor to be used if passed to Emacs, avoiding the call to 'socket' and 'bind'. (Fmake_network_process): Allow users to pass ':use-external-socket' in the parameter plist to use any sockets that have been passed to Emacs. (wait_reading_process_output): Call 'socket' and 'bind' every time. (syms_of_process): New symbol ':use-external-socket'. (set_external_socket_descriptor): New function. (external_sock_fd): New variable. * src/lisp.h: (set_external_socket_descriptor): New declaration. * src/emacs.c (main): Call 'sd_listen_fds' to read the number of sockets passed and call 'set_external_socket_descriptor' to set the external socket. * src/Makefile.in: Add libsystemd library and C flags to the Emacs compilation options. * configure.ac: Add new default-on option "systemd" and check for libsystemd at configure time. * lisp/server.el (server-start): Set ':use-external-socket' to 't' when calling 'make-network-process'. * etc/NEWS: Document new socket-passing functionality and the configure option to disable systemd interaction. * doc/emacs/misc.texi (Emacs Server): Document systemd socket passing functionality and provide systemd unit examples. * doc/lispref/processes.texi (Network Processes): Document new 'make-network-process' option ':use-external-socket'. |
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