c - g_io_channel + socket = server ，还是只得到一个客户端？用C语言

Question

伙计们，这里是 ma 代码:

#include <glib.h>
#include <gio/gio.h> // gio channel

#include <sys/socket.h> //socket();
#include <netdb.h> // structure

#include <stdio.h> // printf

void deal(GIOChannel *in, GIOCondition condition, gpointer data)
{
    struct sockaddr_storage income;

    int insock = g_io_channel_unix_get_fd(in);
    socklen_t income_len = sizeof(income);
    int newsock = accept(insock, (struct sockaddr*)&income, &income_len );
    if(newsock == -1)
    {
        printf("failure on newsock\n");
    }

    char buff[128];

    int recv_total = 0;
    int recv_byte = 128;
    int recv_sizing;

    while (recv_total < recv_byte ){

    recv_sizing = recv(newsock,buff + recv_total,recv_byte,0);

    // breaking if recv_sizing = -1 assuming as error, 0 assuming as lost communication from client suddenly
    if(recv_sizing < 0 || recv_sizing == 0)
     {
         printf("connection lost or error while recv(); [ just guess ] number : %d \n",recv_sizing);
         break;
    }

    recv_byte -= recv_sizing;
    recv_total += recv_sizing;


    }


    buff[recv_total] = '\0';
    //recv_sizing = recv(newsock,buff,recv_byte,0);
    printf("data : %s\n",buff);

    close(newsock); // close immediate and look for another some1 new


}

int main()
{
    GIOChannel *in;


    struct sockaddr_in my;
    my.sin_addr.s_addr = INADDR_ANY;
    my.sin_family      = AF_INET;
    my.sin_port        = htons(3000);

    //socket initiate root socket
    int rsock = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);

    //allow re-use address
    setsockopt(rsock,SOL_SOCKET,SO_REUSEADDR,(int*)1,sizeof(int));

    //binding
    bind(rsock,(struct sockaddr*)&my,sizeof(my));

    //listen
    listen(rsock,10);


    in = g_io_channel_unix_new(rsock);

    g_io_add_watch(in, G_IO_IN | G_IO_OUT | G_IO_HUP, (GIOFunc) deal, NULL);


    GMainLoop *loop = g_main_loop_new(NULL,FALSE); // pengganti while(1) ato gtk_main_loop
    g_main_loop_run(loop);
    return 0;
}

这些是它如何编译和运行的:

$ gcc -o dengersocket_glib dengersocket_glib.c `pkg-config --cflags --libs glib-2.0`
$ ./dengersocket_glib 

客户端想尝试发送:

$ echo wew | nc -v localhost 3000 
nc: connect to localhost port 3000 (tcp) failed: Connection refused
Connection to localhost 3000 port [tcp/*] succeeded!

服务器接收:

$ ./dengersocket_glib 
connection lost or error while recv(); [ just guess ] number : 0 
data : wew

接收正常，但是当另一个客户端尝试连接时:

$ echo dor | nc -v localhost 3000 
nc: connect to localhost port 3000 (tcp) failed: Connection refused
Connection to localhost 3000 port [tcp/*] succeeded!

服务器上没有任何反应，如何让服务器接受多个客户端？在这些情况下真的需要 fd_set 吗？

Answer 1

GIOFunc 类型返回 gboolean，而不是 void。在将函数注册为回调时，您可以通过将函数转换为 GIOFunc 来解决这个问题。

由于您的函数不返回任何内容，因此调用它的 glib 代码可能会将“FALSE”视为函数的返回值。 glib 中的 FALSE 表示“我不再需要监视此事件源”，因此当您的主循环仍在运行时(您永远不会调用 g_main_loop_quit())，它不再监视您的套接字。

正确实现 GIOFunc，您的问题可能会消失。