2 net-nonblock.c : Nonblocking net_connect()
4 Copyright (C) 1998-2000 Timo Sirainen
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 #include "net-nonblock.h"
38 #define is_fatal_error(err) \
39 (err != 0 && err != G_IO_ERROR_AGAIN && errno != EINTR)
41 static int g_io_channel_write_block(GIOChannel *channel, void *data, int len)
48 err = g_io_channel_write(channel, (char *) data + sent,
51 } while (sent < len && !is_fatal_error(err));
53 return err != 0 ? -1 : 0;
56 static int g_io_channel_read_block(GIOChannel *channel, void *data, int len)
62 maxwait = time(NULL)+2;
65 err = g_io_channel_read(channel, (char *) data + received,
68 } while (received < len && time(NULL) < maxwait &&
69 (ret != 0 || !is_fatal_error(err)));
71 return received < len ? -1 : 0;
74 /* nonblocking gethostbyname(), ip (IPADDR) + error (int, 0 = not error) is
75 written to pipe when found PID of the resolver child is returned */
76 int net_gethostbyname_nonblock(const char *addr, GIOChannel *pipe)
84 g_return_val_if_fail(addr != NULL, FALSE);
96 g_warning("net_connect_thread(): fork() failed! "
97 "Using blocking resolving");
102 memset(&rec, 0, sizeof(rec));
103 rec.error = net_gethostbyname(addr, &rec.ip4, &rec.ip6);
104 if (rec.error == 0) {
107 errorstr = net_gethosterror(rec.error);
108 rec.errlen = errorstr == NULL ? 0 : strlen(errorstr)+1;
111 g_io_channel_write_block(pipe, &rec, sizeof(rec));
113 g_io_channel_write_block(pipe, (void *) errorstr, rec.errlen);
120 /* we used blocking lookup */
124 /* get the resolved IP address */
125 int net_gethostbyname_return(GIOChannel *pipe, RESOLVED_IP_REC *rec)
128 rec->errorstr = NULL;
131 fcntl(g_io_channel_unix_get_fd(pipe), F_SETFL, O_NONBLOCK);
135 if (g_io_channel_read_block(pipe, rec, sizeof(*rec)) == -1) {
136 rec->errorstr = g_strdup_printf("Host name lookup: %s",
142 /* read error string, if we can't read everything for some
143 reason, just ignore it. */
144 rec->errorstr = g_malloc0(rec->errlen+1);
145 g_io_channel_read_block(pipe, rec->errorstr, rec->errlen);
151 /* Get host name, call func when finished */
152 int net_gethostbyaddr_nonblock(IPADDR *ip, NET_HOST_CALLBACK func, void *data)
154 /* FIXME: not implemented */
158 /* Kill the resolver child */
159 void net_disconnect_nonblock(int pid)
161 g_return_if_fail(pid > 0);
168 static void simple_init(SIMPLE_THREAD_REC *rec, GIOChannel *handle)
170 g_return_if_fail(rec != NULL);
172 g_source_remove(rec->tag);
174 if (net_geterror(handle) != 0) {
176 g_io_channel_close(handle);
177 g_io_channel_unref(handle);
181 rec->func(handle, rec->data);
185 static void simple_readpipe(SIMPLE_THREAD_REC *rec, GIOChannel *pipe)
187 RESOLVED_IP_REC iprec;
191 g_return_if_fail(rec != NULL);
193 g_source_remove(rec->tag);
195 net_gethostbyname_return(pipe, &iprec);
196 g_free_not_null(iprec.errorstr);
198 g_io_channel_close(rec->pipes[0]);
199 g_io_channel_unref(rec->pipes[0]);
200 g_io_channel_close(rec->pipes[1]);
201 g_io_channel_unref(rec->pipes[1]);
203 ip = iprec.ip4.family != 0 ? &iprec.ip4 : &iprec.ip6;
204 handle = iprec.error == -1 ? NULL :
205 net_connect_ip(ip, rec->port, rec->my_ip);
207 g_free_not_null(rec->my_ip);
209 if (handle == NULL) {
211 rec->func(NULL, rec->data);
216 rec->tag = g_input_add(handle, G_INPUT_READ | G_INPUT_WRITE,
217 (GInputFunction) simple_init, rec);
220 /* Connect to server, call func when finished */
221 int net_connect_nonblock(const char *server, int port, const IPADDR *my_ip,
222 NET_CALLBACK func, void *data)
224 SIMPLE_THREAD_REC *rec;
227 g_return_val_if_fail(server != NULL, FALSE);
228 g_return_val_if_fail(func != NULL, FALSE);
231 g_warning("net_connect_nonblock(): pipe() failed.");
235 rec = g_new0(SIMPLE_THREAD_REC, 1);
238 rec->my_ip = g_malloc(sizeof(IPADDR));
239 memcpy(rec->my_ip, my_ip, sizeof(IPADDR));
243 rec->pipes[0] = g_io_channel_unix_new(fd[0]);
244 rec->pipes[1] = g_io_channel_unix_new(fd[1]);
246 /* start nonblocking host name lookup */
247 net_gethostbyname_nonblock(server, rec->pipes[1]);
248 rec->tag = g_input_add(rec->pipes[0], G_INPUT_READ,
249 (GInputFunction) simple_readpipe, rec);