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adf43b3f08
* module/system/repl/server.scm (run-server): Ignore SIGPIPE when we run a server, as otherwise a rudely disconnected client could cause the server to quit. Thanks to John Proctor for the report, and Detlev Zundel for the debugging.
132 lines
4.2 KiB
Scheme
132 lines
4.2 KiB
Scheme
;;; Repl server
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;; Copyright (C) 2003, 2010, 2011 Free Software Foundation, Inc.
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;; This library is free software; you can redistribute it and/or
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;; modify it under the terms of the GNU Lesser General Public
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;; License as published by the Free Software Foundation; either
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;; version 3 of the License, or (at your option) any later version.
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;;
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;; This library is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;; Lesser General Public License for more details.
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;;
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;; You should have received a copy of the GNU Lesser General Public
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;; License along with this library; if not, write to the Free Software
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;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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;; 02110-1301 USA
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;;; Code:
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(define-module (system repl server)
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#:use-module (system repl repl)
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#:use-module (ice-9 threads)
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#:export (make-tcp-server-socket
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make-unix-domain-server-socket
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run-server
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spawn-server
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stop-server-and-clients!))
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(define *open-sockets* '())
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(define sockets-lock (make-mutex))
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(define (close-socket! s)
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(with-mutex sockets-lock
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(set! *open-sockets* (delq! s *open-sockets*)))
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;; Close-port could block or raise an exception flushing buffered
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;; output. Hmm.
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(close-port s))
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(define (add-open-socket! s)
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(with-mutex sockets-lock
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(set! *open-sockets* (cons s *open-sockets*))))
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(define (stop-server-and-clients!)
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(cond
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((with-mutex sockets-lock
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(and (pair? *open-sockets*)
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(car *open-sockets*)))
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=> (lambda (s)
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(close-socket! s)
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(stop-server-and-clients!)))))
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(define* (make-tcp-server-socket #:key
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(host #f)
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(addr (if host (inet-aton host) INADDR_LOOPBACK))
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(port 37146))
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(let ((sock (socket PF_INET SOCK_STREAM 0)))
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(setsockopt sock SOL_SOCKET SO_REUSEADDR 1)
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(bind sock AF_INET addr port)
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sock))
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(define* (make-unix-domain-server-socket #:key (path "/tmp/guile-socket"))
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(let ((sock (socket PF_UNIX SOCK_STREAM 0)))
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(setsockopt sock SOL_SOCKET SO_REUSEADDR 1)
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(bind sock AF_UNIX path)
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sock))
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(define call-with-sigint
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(if (not (provided? 'posix))
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(lambda (thunk) (thunk))
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(lambda (thunk)
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(let ((handler #f))
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(dynamic-wind
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(lambda ()
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(set! handler
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(sigaction SIGINT (lambda (sig) (throw 'interrupt)))))
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thunk
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(lambda ()
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(if handler
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;; restore Scheme handler, SIG_IGN or SIG_DFL.
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(sigaction SIGINT (car handler) (cdr handler))
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;; restore original C handler.
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(sigaction SIGINT #f))))))))
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(define* (run-server #:optional (server-socket (make-tcp-server-socket)))
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(define (accept-new-client)
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(catch #t
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(lambda () (call-with-sigint (lambda () (accept server-socket))))
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(lambda (k . args)
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(cond
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((port-closed? server-socket)
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;; Shutting down.
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#f)
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((eq? k 'interrupt)
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;; Interrupt.
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(close-socket! server-socket)
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#f)
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(else
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(warn "Error accepting client" k args)
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;; Retry after a timeout.
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(sleep 1)
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(accept-new-client))))))
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(sigaction SIGPIPE SIG_IGN)
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(add-open-socket! server-socket)
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(listen server-socket 5)
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(let lp ((client (accept-new-client)))
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;; If client is false, we are shutting down.
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(if client
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(let ((client-socket (car client))
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(client-addr (cdr client)))
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(add-open-socket! client-socket)
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(make-thread serve-client client-socket client-addr)
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(lp (accept-new-client))))))
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(define* (spawn-server #:optional (server-socket (make-tcp-server-socket)))
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(make-thread run-server server-socket))
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(define (serve-client client addr)
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(with-continuation-barrier
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(lambda ()
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(with-input-from-port client
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(lambda ()
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(with-output-to-port client
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(lambda ()
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(with-error-to-port client
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(lambda ()
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(with-fluids ((*repl-stack* '()))
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(start-repl))))))))))
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(close-socket! client))
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