3 * $Id: conn.c,v 1.9 2003/10/12 14:54:00 mdw Exp $
5 * Nonblocking connect handling
7 * (c) 1999 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of the mLib utilities library.
14 * mLib is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU Library General Public License as
16 * published by the Free Software Foundation; either version 2 of the
17 * License, or (at your option) any later version.
19 * mLib is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU Library General Public License for more details.
24 * You should have received a copy of the GNU Library General Public
25 * License along with mLib; if not, write to the Free
26 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
30 /*----- Revision history --------------------------------------------------*
33 * Revision 1.9 2003/10/12 14:54:00 mdw
36 * Revision 1.8 2003/10/12 14:47:10 mdw
37 * New interface for messing with preconnected sockets.
39 * Revision 1.7 2002/01/13 13:28:44 mdw
40 * Rearrange @conn_init@ to be a bit more comprehensible.
42 * Revision 1.6 2001/06/22 19:35:20 mdw
43 * Interface change to @conn_init@ -- return error rather than calling the
44 * function. This reduces the number of different environments the
45 * callback has to cope with, and the old behaviour is easily simulatable
46 * with the new, while simulating the new behaviour was awkward and
49 * Revision 1.5 2000/10/08 11:17:26 mdw
50 * (conn_connect): Change sizes to be @size_t@.
52 * Revision 1.4 1999/07/26 23:21:02 mdw
53 * Bug fix: remove the selector before doing the callback, in case client
54 * adds a writer for the connected socket.
56 * Revision 1.3 1999/05/23 12:12:37 mdw
57 * Interface change to make the `conn' selector useful for generic stream
58 * sockets rather than just IPv4 ones.
60 * Revision 1.2 1999/05/15 10:33:32 mdw
61 * Fix copyright notices.
63 * Revision 1.1 1999/05/14 21:01:14 mdw
64 * Integrated `select' handling bits from the background resolver project.
68 /*----- Header files ------------------------------------------------------*/
76 #include <sys/types.h>
77 #include <sys/socket.h>
85 /*----- Main code ---------------------------------------------------------*/
87 /* --- @conn_connect@ --- *
89 * Arguments: @int fd@ = file descriptor to try to connect
90 * @unsigned mode@ = what we can do to the file
91 * @void *p@ = pointer to connection context
95 * Use: Handles select results for pending connections.
98 static void conn_connect(int fd, unsigned mode, void *p)
101 # define PATH_MAX 1024
105 char buf[PATH_MAX + 8]; /* Big enough */
109 sel_rmfile(&c->writer);
110 if (getpeername(fd, (struct sockaddr *)buf, &sinsz) < 0) {
112 size_t errsz = sizeof(err);
113 if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &errsz) == 0)
121 /* --- @conn_fd@ --- *
123 * Arguments: @conn *c@ = pointer to connection block
124 * @sel_state *s@ = pointer to select state to attach to
125 * @int fd@ = file descriptor of socket
126 * @void (*func)(int fd, void *p) = handler function
127 * @void *p@ = argument for the handler function
131 * Use: Sets up a nonblocking connect job. The socket should have a
132 * connect pending for it already.
135 void conn_fd(conn *c, sel_state *s, int fd,
136 void (*func)(int /*fd*/, void */*p*/),
141 sel_initfile(s, &c->writer, fd, SEL_WRITE, conn_connect, c);
142 sel_addfile(&c->writer);
145 /* --- @conn_init@ --- *
147 * Arguments: @conn *c@ = pointer to connection block
148 * @sel_state *s@ = pointer to select state to attach to
149 * @int fd@ = file descriptor of socket to connect
150 * @struct sockaddr *dst@ = destination address
151 * @int dsz@ = size of destination address
152 * @void (*func)(int fd, void *p) = handler function
153 * @void *p@ = argument for the handler function
155 * Returns: Zero on success, nonzero on failure.
157 * Use: Sets up a nonblocking connect job. The socket should already
158 * be bound if you care about that sort of thing. When the
159 * connection completes, the handler function is called with the
160 * connected socket as an argument. If the connect fails rather
161 * than completes, the socket is closed, and the handler is
162 * informed of this by being passed a negative file descriptor.
163 * In either case, the select job is then removed.
166 int conn_init(conn *c, sel_state *s, int fd,
167 struct sockaddr *dst, int dsz,
168 void (*func)(int /*fd*/, void */*p*/),
173 if ((f = fcntl(fd, F_GETFL)) < 0 || fcntl(fd, F_SETFL, f | O_NONBLOCK))
176 if (!connect(fd, dst, dsz))
178 else if (errno != EINPROGRESS)
181 conn_fd(c, s, fd, func, p);
189 /* --- @conn_kill@ --- *
191 * Arguments: @conn *c@ = pointer to connection to dispose of
195 * Use: Disposes of a connection when it's not wanted any more.
198 void conn_kill(conn *c)
200 if (c->writer.fd != -1) {
202 sel_rmfile(&c->writer);
207 /*----- That's all, folks -------------------------------------------------*/