3 * $Id: conn.c,v 1.5 2000/10/08 11:17:26 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 1.5 2000/10/08 11:17:26 mdw
34 * (conn_connect): Change sizes to be @size_t@.
36 * Revision 1.4 1999/07/26 23:21:02 mdw
37 * Bug fix: remove the selector before doing the callback, in case client
38 * adds a writer for the connected socket.
40 * Revision 1.3 1999/05/23 12:12:37 mdw
41 * Interface change to make the `conn' selector useful for generic stream
42 * sockets rather than just IPv4 ones.
44 * Revision 1.2 1999/05/15 10:33:32 mdw
45 * Fix copyright notices.
47 * Revision 1.1 1999/05/14 21:01:14 mdw
48 * Integrated `select' handling bits from the background resolver project.
52 /*----- Header files ------------------------------------------------------*/
60 #include <sys/types.h>
61 #include <sys/socket.h>
69 /*----- Main code ---------------------------------------------------------*/
71 /* --- @conn_connect@ --- *
73 * Arguments: @int fd@ = file descriptor to try to connect
74 * @unsigned mode@ = what we can do to the file
75 * @void *p@ = pointer to connection context
79 * Use: Handles select results for pending connections.
82 static void conn_connect(int fd, unsigned mode, void *p)
85 # define PATH_MAX 1024
89 char buf[PATH_MAX + 8]; /* Big enough */
93 sel_rmfile(&c->writer);
94 if (getpeername(fd, (struct sockaddr *)buf, &sinsz) < 0) {
96 size_t errsz = sizeof(err);
97 if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &errsz) == 0)
105 /* --- @conn_init@ --- *
107 * Arguments: @conn *c@ = pointer to connection block
108 * @sel_state *s@ = pointer to select state to attach to
109 * @int fd@ = file descriptor of socket to connect
110 * @struct sockaddr *dst@ = destination address
111 * @int dsz@ = size of destination address
112 * @void (*func)(int fd, void *p) = handler function
113 * @void *p@ = argument for the handler function
117 * Use: Sets up a nonblocking connect job. The socket should already
118 * be bound if you care about that sort of thing. When the
119 * connection completes, the handler function is called with the
120 * connected socket as an argument. If the connect fails rather
121 * than completes, the socket is closed, and the handler is
122 * informed of this by being passed a negative file descriptor.
123 * In either case, the select job is then removed.
126 void conn_init(conn *c, sel_state *s, int fd,
127 struct sockaddr *dst, int dsz,
128 void (*func)(int /*fd*/, void */*p*/),
133 if ((f = fcntl(fd, F_GETFL)) < 0 ||
134 fcntl(fd, F_SETFL, f | O_NONBLOCK))
137 if (connect(fd, dst, dsz) < 0) {
138 if (errno != EINPROGRESS)
142 sel_initfile(s, &c->writer, fd, SEL_WRITE, conn_connect, c);
143 sel_addfile(&c->writer);
149 /* --- Something went pear-shaped --- */
156 /* --- @conn_kill@ --- *
158 * Arguments: @conn *c@ = pointer to connection to dispose of
162 * Use: Disposes of a connection when it's not wanted any more.
165 void conn_kill(conn *c)
167 if (c->writer.fd != -1) {
169 sel_rmfile(&c->writer);
174 /*----- That's all, folks -------------------------------------------------*/