我目前有一个同步UDP应用程序接收消息。
代码:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <glib.h>
#include <gio/gio.h>
int main(argc,argv)
int argc;
char ** argv;{
char buf[256], *ptr, sep[] = "| ";
GError * error = NULL;
GSocket * socket;
GSocketAddress *gsockAddr, *gfromAddr;
guint16 udp_port = 1500;
//Creates socket udp ipv4
socket = g_socket_new(G_SOCKET_FAMILY_IPV4,
G_SOCKET_TYPE_DATAGRAM,
G_SOCKET_PROTOCOL_UDP,
&error);
g_assert(error == NULL);
if (socket == NULL) {
g_print("ERROR");
exit(1);
}
//sockaddr struct like
gsockAddr = G_SOCKET_ADDRESS(g_inet_socket_address_new(g_inet_address_new_any(G_SOCKET_FAMILY_IPV4), udp_port));
if(gsockAddr == NULL){
g_error("Error socket\n");
exit(1);
}
//
if (g_socket_bind (socket, gsockAddr, TRUE, NULL) == FALSE){
g_print("Error bind\n");
exit(1);
}
int bytes = g_socket_receive_from (socket,
&gfromAddr,
buf,
255,
NULL,
&error);
if (bytes == -1) {
g_warning ("Failed to receive from socket: %s", error->message);
g_error_free (error);
return TRUE;
}
g_message("Server receive: %s", buf);
guint16 port = g_inet_socket_address_get_port(G_INET_SOCKET_ADDRESS(gfromAddr));
g_print("...from %s(%d)\n",g_inet_address_to_string(g_inet_socket_address_get_address(G_INET_SO CKET_ADDRESS(gfromAddr))), (int) port);
exit(0);
}
所以,我想进行接收操作,非阻塞而不是阻塞。我想让它成为ansynchronous,或者/和线程,这样,同时,我可以做与我想要开发的应用程序相关的其他操作。
但我并没有像我想的那样成功。我尝试使用GLib IO通道,但我无法使其工作。进程正在等待,但只是因为主循环(我不能telnet应用程序)。
代码:
#include <gio/gio.h>
#include <glib.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define BLOCK_SIZE 1024
static gboolean
gio_read_socket (GIOChannel *channel,
GIOCondition condition,
gpointer data)
{
char buf[1024];
gsize bytes_read;
GError *error = NULL;
if (condition & G_IO_HUP) return FALSE; /* this channel is done */
g_io_channel_read_chars (channel, buf, sizeof (buf), &bytes_read,
&error);
g_assert (error == NULL);
buf[bytes_read] = '\0';
g_print ("%s", buf);
return TRUE;
}
int
main (int argc, char **argv)
{
GSocket * s_udp;
GError *err = NULL;
guint16 udp_port = 5556;
s_udp = g_socket_new(G_SOCKET_FAMILY_IPV4,
G_SOCKET_TYPE_DATAGRAM,
G_SOCKET_PROTOCOL_UDP,
&err);
g_assert(err == NULL);
if (s_udp == NULL) {
g_print("ERROR");
exit(1);
}
g_socket_bind(s_udp,
G_SOCKET_ADDRESS(g_inet_socket_address_new(g_inet_address_new_any(G_SOCKET_FAMILY_IPV4), udp_port)),
TRUE,
&err);
g_assert(err == NULL);
int fd = g_socket_get_fd(s_udp);
GIOChannel* channel = g_io_channel_unix_new(fd);
guint source = g_io_add_watch(channel, G_IO_IN,
(GIOFunc) gio_read_socket, NULL);
g_io_channel_unref(channel);
GMainLoop *loop = g_main_loop_new(NULL, FALSE);
g_main_loop_run(loop);
g_main_loop_unref(loop);
}
我是GLib / Gio的初学者,我认为我对IO频道做错了。我想将它作为一个事件添加到主循环中,以便我可以使用我的回调函数。也许有一种更简单的方法可以做到这一点。
此外,我有一个TCP异步和线程服务器正在工作,但我没有找到如何对UDP做同样的事情(使用GThreadedSocketService并创建一个套接字监听器,然后将服务添加到主循环。馅饼与TCP)。
你知道怎么办吗?如果你知道如何做,但只有基本的API套接字,我仍然接受它!感谢。
答案 0 :(得分:4)
我明白了。
我确实非常初学者。因为,当我想测试我的udp应用程序(第二个代码块)时,我使用telnet连接到它并尝试发送消息。但是,我们当然不能telnet udp应用程序......
所以我尝试使用一个简单的udp发送器(顺便使用Glib / Gio)而不是telnet,它工作正常,非阻塞和可重用。我做了一些改变,但基本上,它是一样的。我放了一个空闲函数来向你展示它是如何非阻塞的,这是否有一天可以帮助某人。
我的简单Glib / Gio UDP应用程序,非阻止:
#include <gio/gio.h>
#include <glib.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define BLOCK_SIZE 1024
static gboolean
gio_read_socket (GIOChannel *channel,
GIOCondition condition,
gpointer data)
{
char buf[1024];
gsize bytes_read;
GError *error = NULL;
if (condition & G_IO_HUP) return FALSE; /* this channel is done */
g_io_channel_read_chars (channel, buf, sizeof (buf), &bytes_read,
&error);
g_assert (error == NULL);
buf[bytes_read] = '\0';
g_print ("%s", buf);
int *a = data;
*a = *a + 1;
return TRUE;
}
gboolean
idleCpt (gpointer user_data){
int *a = user_data;
g_print("%d\n", *a);
sleep(1);
return TRUE;
}
int
main (int argc, char **argv)
{
GSocket * s_udp;
GError *err = NULL;
int idIdle = -1, dataI = 0;
guint16 udp_port = 1505;
GSocketAddress * gsockAddr = G_SOCKET_ADDRESS(g_inet_socket_address_new(g_inet_address_new_any(G_SOCKET_FAMILY_IPV4), udp_port));
s_udp = g_socket_new(G_SOCKET_FAMILY_IPV4,
G_SOCKET_TYPE_DATAGRAM,
G_SOCKET_PROTOCOL_UDP,
&err);
g_assert(err == NULL);
if (s_udp == NULL) {
g_print("ERREUR");
exit(1);
}
if (g_socket_bind (s_udp, gsockAddr, TRUE, NULL) == FALSE){
g_print("Erreur bind\n");
exit(1);
}
g_assert(err == NULL);
int fd = g_socket_get_fd(s_udp);
GIOChannel* channel = g_io_channel_unix_new(fd);
guint source = g_io_add_watch(channel, G_IO_IN,
(GIOFunc) gio_read_socket, &dataI);
g_io_channel_unref(channel);
GMainLoop *loop = g_main_loop_new(NULL, FALSE);
idIdle = g_idle_add(idleCpt, &dataI);
g_main_loop_run(loop);
}
代码并不完美,需要做很多优化,但我们可以从中做到很好的事情。如果你想看我的udp发件人,请问。