1 (in-package :sb-bsd-sockets)
4 getsockopt(socket, level, int optname, void *optval, socklen_t *optlen)
5 setsockopt(socket, level, int optname, void *optval, socklen_t optlen)
6 ^ SOL_SOCKET or a protocol number
8 In terms of providing a useful interface, we have to face up to the
9 fact that most of these take different data types - some are integers,
10 some are booleans, some are foreign struct instances, etc etc
12 (define-socket-option lisp-name doc level number mangle-arg size mangle-return)
14 macro-expands to two functions that define lisp-name and (setf ,lisp-name)
15 and calls the functions mangle-arg and mangle-return on outgoing and incoming
18 Parameters passed to the function thus defined (lisp-name)
19 are all passed directly into mangle-arg. mangle-arg should return an
20 alien pointer - this is passed unscathed to the foreign routine, so
21 wants to have type (* t). Note that even for options that have
22 integer arguments, this is still a pointer to said integer.
24 size is the size of the buffer that the return of mangle-arg points
25 to, and also of the buffer that we should allocate for getsockopt
28 mangle-return is called with an alien buffer and should turn it into
29 something that the caller will want.
31 Code for options that not every system has should be conditionalised:
33 (if (boundp 'sockint::IP_RECVIF)
34 (define-socket-option so-receive-interface nil (getprotobyname "ip")
35 sockint::IP_RECVIF ... ))
38 (defmacro define-socket-option
39 (lisp-name documentation
40 level number buffer-type mangle-arg mangle-return mangle-setf-buffer)
42 (if (numberp (eval level))
44 `(get-protocol-by-name ,(string-downcase (symbol-name level))))))
47 (defun ,lisp-name (socket &aux (fd (socket-file-descriptor socket)))
48 ,@(when documentation (list documentation))
49 (sb-alien:with-alien ((size sb-alien:integer)
50 (buffer ,buffer-type))
51 (setf size (sb-alien:alien-size ,buffer-type :bytes))
52 (if (= -1 (sockint::getsockopt fd ,find-level ,number
53 (sb-alien:addr buffer)
54 (sb-alien:addr size)))
55 (socket-error "getsockopt")
56 (,mangle-return buffer size))))
57 (defun (setf ,lisp-name) (new-val socket
58 &aux (fd (socket-file-descriptor socket)))
59 (sb-alien:with-alien ((buffer ,buffer-type))
60 (setf buffer ,(if mangle-arg
61 `(,mangle-arg new-val)
63 (when (= -1 (sockint::setsockopt fd ,find-level ,number
64 (,mangle-setf-buffer buffer)
65 ,(if (eql buffer-type 'sb-alien:c-string)
67 `(sb-alien:alien-size ,buffer-type :bytes))))
68 (socket-error "setsockopt")))))))
70 ;;; sockopts that have integer arguments
72 (defun foreign-int-to-integer (buffer size)
73 (assert (= size (sb-alien:alien-size sb-alien:integer :bytes)))
76 (defmacro define-socket-option-int (name level number)
77 `(define-socket-option ,name nil ,level ,number
78 sb-alien:integer nil foreign-int-to-integer sb-alien:addr))
80 (define-socket-option-int
81 sockopt-receive-low-water sockint::sol-socket sockint::so-rcvlowat)
82 (define-socket-option-int
83 sockopt-send-low-water sockint::sol-socket sockint::so-sndlowat)
84 (define-socket-option-int
85 sockopt-type sockint::sol-socket sockint::so-type)
86 (define-socket-option-int
87 sockopt-send-buffer sockint::sol-socket sockint::so-sndbuf)
88 (define-socket-option-int
89 sockopt-receive-buffer sockint::sol-socket sockint::so-rcvbuf)
90 #+linux(define-socket-option-int
91 sockopt-priority sockint::sol-socket sockint::so-priority)
93 ;;; boolean options are integers really
95 (defun foreign-int-to-bool (x size)
96 (if (zerop (foreign-int-to-integer x size))
100 (defun bool-to-foreign-int (val)
103 (defmacro define-socket-option-bool (name level c-name)
104 `(define-socket-option ,name
105 ,(format nil "Return the value of the ~A socket option for SOCKET. This can also be updated with SETF." (symbol-name c-name))
107 sb-alien:integer bool-to-foreign-int foreign-int-to-bool sb-alien:addr))
109 (define-socket-option-bool
110 sockopt-reuse-address sockint::sol-socket sockint::so-reuseaddr)
111 (define-socket-option-bool
112 sockopt-keep-alive sockint::sol-socket sockint::so-keepalive)
113 (define-socket-option-bool
114 sockopt-oob-inline sockint::sol-socket sockint::so-oobinline)
115 #+linux(define-socket-option-bool
116 sockopt-bsd-compatible sockint::sol-socket sockint::so-bsdcompat)
117 #+linux(define-socket-option-bool
118 sockopt-pass-credentials sockint::sol-socket sockint::so-passcred)
119 (define-socket-option-bool
120 sockopt-debug sockint::sol-socket sockint::so-debug)
121 (define-socket-option-bool
122 sockopt-dont-route sockint::sol-socket sockint::so-dontroute)
123 (define-socket-option-bool
124 sockopt-broadcast sockint::sol-socket sockint::so-broadcast)
126 (define-socket-option-bool sockopt-tcp-nodelay :tcp sockint::tcp-nodelay)
128 (defun identity-1 (x &rest args)
129 (declare (ignore args))
132 #+linux(define-socket-option sockopt-bind-to-device nil sockint::sol-socket
133 sockint::so-bindtodevice sb-alien:c-string identity identity-1 identity)
135 ;;; other kinds of socket option
137 ;;; so_peercred takes a ucre structure
138 ;;; so_linger struct linger {
139 ; int l_onoff; /* linger active */
140 ; int l_linger; /* how many seconds to linger for */
145 (sockopt-reuse-address 2)
147 (defun echo-server ()
148 (let ((s (make-inet-socket :stream (get-protocol-by-name "tcp"))))
149 (setf (sockopt-reuse-address s) t)
150 (setf (sockopt-bind-to-device s) "lo")
151 (socket-bind s (make-inet-address "127.0.0.1") 3459)
154 (let* ((s1 (socket-accept s))
155 (stream (socket-make-stream s1 :input t :output t :buffering :none)))
156 (let ((line (read-line stream)))
157 (format t "got one ~A ~%" line)
158 (format stream "~A~%" line))