/usr/share/uim/socket.scm is in uim-data 1:1.8.6+gh20180114.64e3173-2build2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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;;;
;;; Copyright (c) 2009-2013 uim Project https://github.com/uim/uim
;;;
;;; All rights reserved.
;;;
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:
;;; 1. Redistributions of source code must retain the above copyright
;;; notice, this list of conditions and the following disclaimer.
;;; 2. Redistributions in binary form must reproduce the above copyright
;;; notice, this list of conditions and the following disclaimer in the
;;; documentation and/or other materials provided with the distribution.
;;; 3. Neither the name of authors nor the names of its contributors
;;; may be used to endorse or promote products derived from this software
;;; without specific prior written permission.
;;;
;;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
;;; ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
;;; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
;;; ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE
;;; FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
;;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
;;; OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
;;; HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
;;; LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
;;; OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
;;; SUCH DAMAGE.
;;;;
(require-extension (srfi 1 2 9))
(use util)
(require "fileio.scm")
(require-dynlib "socket")
(define addrinfo-ai-flags-alist (addrinfo-ai-flags-alist?))
(define addrinfo-ai-family-alist (addrinfo-ai-family-alist?))
(define addrinfo-ai-socktype-alist (addrinfo-ai-socktype-alist?))
(define addrinfo-ai-protocol-alist (addrinfo-ai-protocol-alist?))
(define (addrinfo-ai-flags-number l)
(apply logior
(map (lambda (s)
(assq-cdr s addrinfo-ai-flags-alist))
l)))
(define (addrinfo-ai-family-number s)
(assq-cdr s addrinfo-ai-family-alist))
(define (addrinfo-ai-socktype-number s)
(assq-cdr s addrinfo-ai-socktype-alist))
(define (addrinfo-ai-protocol-number s)
(assq-cdr s addrinfo-ai-protocol-alist))
(define (call-with-getaddrinfo-hints flags family socktype protocol thunk)
(let* ((hints (make-addrinfo)))
(and flags (addrinfo-set-ai-flags! hints (addrinfo-ai-flags-number flags)))
(and family (addrinfo-set-ai-family! hints (addrinfo-ai-family-number family)))
(and socktype (addrinfo-set-ai-socktype! hints (addrinfo-ai-socktype-number socktype)))
(and protocol (addrinfo-set-ai-protocol! hints (addrinfo-ai-protocol-number protocol)))
(let ((ret (thunk hints)))
(delete-addrinfo hints)
ret)))
(define (call-with-getaddrinfo hostname servname hints thunk)
(let* ((res (getaddrinfo hostname servname hints))
(ret (if res (thunk res) '())))
(if res
(freeaddrinfo (car res)))
ret))
(define (call-with-sockaddr-un family path thunk)
(let* ((sun (make-sockaddr-un)))
(sockaddr-set-un-sun-family! sun family)
(sockaddr-set-un-sun-path! sun path)
(let ((ret (thunk sun)))
(delete-sockaddr-un sun)
ret)))
(define (call-with-sockaddr-storage thunk)
(let* ((ss (make-sockaddr-storage))
(ret (thunk ss)))
(delete-sockaddr-storage ss)
ret))
(define shutdown-how-alist (shutdown-how-alist?))
(define (tcp-connect hostname servname)
(call-with-getaddrinfo-hints
'($AI_PASSIVE) '$PF_UNSPEC '$SOCK_STREAM #f
(lambda (hints)
(call-with-getaddrinfo
hostname servname hints
(lambda (res)
(call/cc
(lambda (fd)
(not (map (lambda (res0)
(let ((s (socket (addrinfo-ai-family? res0)
(addrinfo-ai-socktype? res0)
(addrinfo-ai-protocol? res0))))
(if (< s 0)
#f
(if (< (connect s
(addrinfo-ai-addr? res0)
(addrinfo-ai-addrlen? res0))
0)
(begin
(file-close s)
#f)
(fd s)))))
res)))))))))
(define (unix-domain-socket-connect socket-path)
(let ((s (socket (addrinfo-ai-family-number '$PF_LOCAL)
(addrinfo-ai-socktype-number '$SOCK_STREAM)
0)))
(if (< s 0)
#f
(call-with-sockaddr-un
(addrinfo-ai-family-number '$PF_LOCAL)
socket-path
(lambda (sun)
(if (< (connect s sun (sun-len sun))
0)
(begin
(file-close s)
#f)
s))))))
(define *tcp-listen:backlog-length* 5)
(define (tcp-listen hostname servname)
(filter
integer?
(call-with-getaddrinfo-hints
'($AI_PASSIVE) '$PF_UNSPEC '$SOCK_STREAM #f
(lambda (hints)
(call-with-getaddrinfo
hostname servname hints
(lambda (res)
(map (lambda (res0)
(let ((s (socket (addrinfo-ai-family? res0)
(addrinfo-ai-socktype? res0)
(addrinfo-ai-protocol? res0))))
(if (< s 0)
#f
(if (< (bind s
(addrinfo-ai-addr? res0)
(addrinfo-ai-addrlen? res0))
0)
(begin
(file-close s)
#f)
(begin
(listen s *tcp-listen:backlog-length*)
s)))))
res)))))))
(define (unix-domain-listen path)
(let ((s (socket (addrinfo-ai-family-number '$PF_LOCAL)
(addrinfo-ai-socktype-number '$SOCK_STREAM)
0)))
(if (< s 0)
#f
(call-with-sockaddr-un (addrinfo-ai-family-number '$PF_LOCAL)
path
(lambda (un)
(if (< (bind s un (sun-len un))
0)
(begin
(file-close s)
#f)
(begin
(listen s *tcp-listen:backlog-length*)
;; same as tcp socket
(list s))))))))
(define (make-socket-server thunk accept-pred)
(lambda (socks)
(let loop ((cs '()))
(let* ((fds (file-ready? (append socks cs) -1))
(results (map (lambda (pfd)
(cond ((or (not pfd)
(null? pfd))
#f) ;; what to do?
;; closed by peer
((not (= (cdr pfd)
(assq-cdr '$POLLIN file-poll-flags-alist)))
(file-close (car pfd))
(cons 'delete (car pfd)))
;; start new session
((find (lambda (s)
(= s (car pfd)))
socks)
(let ((cs (accept-pred (car pfd))))
(if (= -1 cs)
#f ;; XXX
(cons 'new cs))))
;; in session
(else
(if (not (thunk (car pfd)))
(begin
(shutdown (car pfd)
(assq-cdr '$SHUT_RDWR shutdown-how-alist))
(file-close (car pfd))
(cons 'delete (car pfd)))
;; keep state
(car pfd)))))
fds))
(new-cs (map cdr (filter (lambda (x) (and (pair? x) (eq? (car x) 'new))) results)))
(delete-cs (map cdr (filter (lambda (x) (and (pair? x) (eq? (car x) 'delete))) results))))
(loop (remove (lambda (x)
(find (lambda (d) (= x d))
delete-cs))
(append cs new-cs)))))))
(define (make-tcp-server thunk)
(make-socket-server thunk
(lambda (s)
(call-with-sockaddr-storage
(lambda (ss)
(accept s ss))))))
(define (make-unix-domain-server thunk)
(make-socket-server thunk
(lambda (s)
(call-with-sockaddr-un
(addrinfo-ai-family-number '$PF_LOCAL)
""
(lambda (ss)
(accept s ss))))))
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