3 * $Id: conn.c,v 1.6 2001/06/22 19:35:20 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 1.6 2001/06/22 19:35:20 mdw
34 * Interface change to @conn_init@ -- return error rather than calling the
35 * function. This reduces the number of different environments the
36 * callback has to cope with, and the old behaviour is easily simulatable
37 * with the new, while simulating the new behaviour was awkward and
40 * Revision 1.5 2000/10/08 11:17:26 mdw
41 * (conn_connect): Change sizes to be @size_t@.
43 * Revision 1.4 1999/07/26 23:21:02 mdw
44 * Bug fix: remove the selector before doing the callback, in case client
45 * adds a writer for the connected socket.
47 * Revision 1.3 1999/05/23 12:12:37 mdw
48 * Interface change to make the `conn' selector useful for generic stream
49 * sockets rather than just IPv4 ones.
51 * Revision 1.2 1999/05/15 10:33:32 mdw
52 * Fix copyright notices.
54 * Revision 1.1 1999/05/14 21:01:14 mdw
55 * Integrated `select' handling bits from the background resolver project.
59 /*----- Header files ------------------------------------------------------*/
67 #include <sys/types.h>
68 #include <sys/socket.h>
76 /*----- Main code ---------------------------------------------------------*/
78 /* --- @conn_connect@ --- *
80 * Arguments: @int fd@ = file descriptor to try to connect
81 * @unsigned mode@ = what we can do to the file
82 * @void *p@ = pointer to connection context
86 * Use: Handles select results for pending connections.
89 static void conn_connect(int fd, unsigned mode, void *p)
92 # define PATH_MAX 1024
96 char buf[PATH_MAX + 8]; /* Big enough */
100 sel_rmfile(&c->writer);
101 if (getpeername(fd, (struct sockaddr *)buf, &sinsz) < 0) {
103 size_t errsz = sizeof(err);
104 if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &errsz) == 0)
112 /* --- @conn_init@ --- *
114 * Arguments: @conn *c@ = pointer to connection block
115 * @sel_state *s@ = pointer to select state to attach to
116 * @int fd@ = file descriptor of socket to connect
117 * @struct sockaddr *dst@ = destination address
118 * @int dsz@ = size of destination address
119 * @void (*func)(int fd, void *p) = handler function
120 * @void *p@ = argument for the handler function
122 * Returns: Zero on success, nonzero on failure.
124 * Use: Sets up a nonblocking connect job. The socket should already
125 * be bound if you care about that sort of thing. When the
126 * connection completes, the handler function is called with the
127 * connected socket as an argument. If the connect fails rather
128 * than completes, the socket is closed, and the handler is
129 * informed of this by being passed a negative file descriptor.
130 * In either case, the select job is then removed.
133 int conn_init(conn *c, sel_state *s, int fd,
134 struct sockaddr *dst, int dsz,
135 void (*func)(int /*fd*/, void */*p*/),
140 if ((f = fcntl(fd, F_GETFL)) < 0 ||
141 fcntl(fd, F_SETFL, f | O_NONBLOCK))
144 if (connect(fd, dst, dsz) < 0) {
145 if (errno != EINPROGRESS)
149 sel_initfile(s, &c->writer, fd, SEL_WRITE, conn_connect, c);
150 sel_addfile(&c->writer);
156 /* --- Something went pear-shaped --- */
163 /* --- @conn_kill@ --- *
165 * Arguments: @conn *c@ = pointer to connection to dispose of
169 * Use: Disposes of a connection when it's not wanted any more.
172 void conn_kill(conn *c)
174 if (c->writer.fd != -1) {
176 sel_rmfile(&c->writer);
181 /*----- That's all, folks -------------------------------------------------*/