Linux下用GTK和socket實現簡單的聊天室

用GTK和socket實現簡單的聊天室，出現“段錯誤”。是哪裡的問題？？

    麻煩看看我的程序，我要用GTK圖形界面做一個簡單的聊天室，在兩台機器上實現通信。現在程序可以編譯過去，但是運行時，當客戶段彈出登錄界面時，輸入用戶名再點擊確定的時候，就在終端顯示“段錯誤”。我是新手，剛剛入門，向前輩們請教，盼回復。

    服務器端：

     #include
#include
#include
#include
#include
#include
#include
#include
#include
#include

#include

#include

#include

#include

#include

#define OUTPORT 3333
#define MAX_USERS 8

struct _client{
gint sd;
gboolean in_use;
gchar name[64];
gchar buf[1024];
};
typedef struct _client client;

client user[MAX_USERS];

void do_service(gpointer id)
{
gint j;
char tobuf[1024];

while(read(user[GPOINTER_TO_INT(id)].sd,
user[GPOINTER_TO_INT(id)].buf,1024)!=-1)
{
sprintf(tobuf,"%s: %s\n",user[GPOINTER_TO_INT(id)].name,
user[GPOINTER_TO_INT(id)].buf);
for(j=0;j {
if(user[j].in_use)
{
write(user[j].sd,tobuf,1024);
g_printf("%s",tobuf);
}
}
}
user[GPOINTER_TO_INT(id)].in_use=FALSE;
close(user[GPOINTER_TO_INT(id)].sd);
//exit(0);
}

int main(int agrv,char *argv[])
{
gint sd,newsd;
struct sockaddr_in *my_addr; /* 本機地址信息 */

struct sockaddr_in *remote_addr; /* 客戶端地址信息 */
gint slen;
gint count=0;
gint flags;
gchar buf[1024];
gchar tobuf[1024];
gint length,i,j;

if(!g_thread_supported())
g_thread_init(NULL);
else
g_print("thread not support\n");

sd=socket(AF_INET,SOCK_STREAM,0);
if(sd==-1)
{
g_print("Creat socket error!\n");
return -1;
}

my_addr=g_new(struct sockaddr_in,1);
my_addr->sin_family=AF_INET;
my_addr->sin_port=htons(OUTPORT);
my_addr->sin_addr.s_addr = INADDR_ANY;
bzero( &(my_addr->sin_zero),8);

slen=sizeof(struct sockaddr_in);

if(bind(sd,(struct sockaddr *) my_addr,slen)<0)
{
g_print("bind error\n!");
return -1;
}

if(listen(sd,8)<0)
{
g_print("listen error!\n");
}

for(i=0;i user.in_use=FALSE;

flags=fcntl(sd,F_GETFL);
fcntl(sd,F_GETFL,flags&~O_NDELAY);

for(;;)
{
newsd=accept(sd,(struct sockaddr *) remote_addr, &slen);
if(newsd==-1)
{
g_print("accept error\n");
break;
}
else
{
if(count>=MAX_USERS)
{
sprintf(buf,"用戶數量過多，服務器不能連接!\n");
write(newsd,buf,1024);
close(newsd);
}
else
{
flags=fcntl(user.sd,F_GETFL);
fcntl(user.sd,F_SETFL,O_NONBLOCK);
user[count].sd=newsd;
user[count].in_use=TRUE;
read(newsd,user[count].name,64);

g_thread_create((GThreadFunc)do_service,
(gpointer)count,TRUE,NULL);
count++;
}
}
}//for(;;)

close(sd);
g_free(my_addr);
}

 服務器端：

     #include
#include
#include
#include
#include

#include

#include

#include

#include

#define OUTPORT 3333

gint sd;
struct sockaddr_in s_in;
struct hostent *host;
gchar username[64];
gchar buf[1024];//read
gchar get_buf[1048];//write
gboolean isconnected=FALSE;

static GtkWidget *text;
static GtkTextBuffer *buffer;
static GtkWidget *message_entry;
static GtkWidget *name_entry;
static GtkWidget *login_button;

void get_message(void)
{
GtkTextIter iter;
gchar get_buf[1024];
gchar buf[1024];
while(read(sd,buf,1024)!=-1)
{
sprintf(get_buf,"%s",buf);
gdk_threads_enter();
gtk_text_buffer_get_end_iter(buffer,&iter);
gtk_text_buffer_insert(buffer,&iter,get_buf,-1);

gdk_threads_leave();
}
}

void on_destroy(GtkWidget *widget,GdkEvent *event,gpointer data)
{
sprintf(username,"guest");
if(do_connect()==TRUE)
{
gtk_widget_set_sensitive(login_button,FALSE);
g_thread_create((GThreadFunc)get_message,NULL,FALSE,NULL);
}
gtk_widget_destroy(widget);
}

void on_button_clicked(GtkButton *button,gpointer data)
{
const gchar *name;

name=gtk_entry_get_text(GTK_ENTRY(name_entry));
sprintf(username,"%s",name);
if(do_connect())
{
gtk_widget_set_sensitive(login_button,FALSE);
g_thread_create((GThreadFunc)get_message,NULL,FALSE,NULL);
}
gtk_widget_destroy(data);
}

void creat_win(void)
{
GtkWidget *win,*vbox;
GtkWidget *button;

win=gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(win),"輸入用戶名");
gtk_container_set_border_width(GTK_CONTAINER(win),10);
g_signal_connect(G_OBJECT(win),"delete_event",
G_CALLBACK(on_destroy),NULL);
gtk_window_set_modal(GTK_WINDOW(win),TRUE);
gtk_window_set_position(GTK_WINDOW(win),GTK_WIN_POS_CENTER);

vbox= gtk_vbox_new(FALSE,0);
gtk_container_add(GTK_CONTAINER(win),vbox);

name_entry=gtk_entry_new();
gtk_box_pack_start(GTK_BOX(vbox),name_entry,TRUE,TRUE,5);
button=gtk_button_new_from_stock(GTK_STOCK_OK);
g_signal_connect(G_OBJECT(button),"clicked",
G_CALLBACK(on_button_clicked),win);
gtk_box_pack_start(GTK_BOX(vbox),button,FALSE,FALSE,5);

gtk_widget_show_all(win);
}

gboolean do_connect(void)
{
GtkTextIter iter;
gint slen;
sd=socket(AF_INET,SOCK_STREAM,0);
if(sd<0)
{
gtk_text_buffer_get_end_iter(buffer,&iter);
gtk_text_buffer_insert(buffer,&iter,"打開套接字時出錯！\n",-1);
return FALSE;
}
s_in.sin_family=AF_INET;
s_in.sin_port=htons(OUTPORT);
s_in.sin_addr=*((struct in_addr *)host->h_addr);
bzero(&(s_in.sin_zero),8);

slen=sizeof(s_in);
if(connect(sd,(struct sockaddr *) &s_in,slen)<0)
{
gtk_text_buffer_get_end_iter(buffer,&iter);
gtk_text_buffer_insert(buffer,&iter,"連接服務器時出錯！\n",-1);
return FALSE;
}
else
{
gtk_text_buffer_get_end_iter(buffer,&iter);
gtk_text_buffer_insert(buffer,&iter,username,-1);
gtk_text_buffer_get_end_iter(buffer,&iter);
gtk_text_buffer_insert(buffer,&iter,"\n成功於服務器連接!\n",-1);
//
write(sd,username,64);
//
isconnected=TRUE;
return TRUE;
}
}

void on_send(GtkButton *button,gpointer data)
{
const char *message;
if(isconnected==FALSE) return;
message=gtk_entry_get_text(GTK_ENTRY(message_entry));
sprintf(buf,"%s\n",message);
write(sd,buf,1024);
gtk_entry_set_text(GTK_ENTRY(message_entry),"");
}

void on_login(GtkWidget *widget,GdkEvent *weent,gpointer data)
{
creat_win();
}

void on_delete_event(GtkWidget *widget,GdkEvent *event,gpointer data)
{
close(sd);
gtk_main_quit();
}

int main(int argc,char *argv[])
{
GtkWidget *window;
GtkWidget *vbox,*hbox,*button,*label,*view;

if(!g_thread_supported())
g_thread_init(NULL);
gtk_init(&argc,&argv);

window=gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(window),"客戶端");
g_signal_connect(G_OBJECT(window),"delete_event",
G_CALLBACK(on_delete_event),NULL);
gtk_container_set_border_width(GTK_CONTAINER(window),10);

vbox=gtk_vbox_new(FALSE,0);
gtk_container_add(GTK_CONTAINER(window),vbox);

hbox=gtk_hbox_new(FALSE,0);
gtk_box_pack_start(GTK_BOX(vbox),hbox,FALSE,FALSE,5);
label=gtk_label_new("點擊登錄按鈕連接服務器");
gtk_box_pack_start(GTK_BOX(hbox),label,FALSE,FALSE,5);
login_button=gtk_button_new_with_label("登錄");
gtk_box_pack_start(GTK_BOX(hbox),login_button,FALSE,FALSE,5);
g_signal_connect(G_OBJECT(login_button),"clicked",
G_CALLBACK(on_login),NULL);

view=gtk_scrolled_window_new(NULL,NULL);
gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(view),
GTK_POLICY_AUTOMATIC,GTK_POLICY_AUTOMATIC);
text=gtk_text_view_new();
gtk_box_pack_start(GTK_BOX(vbox),view,TRUE,TRUE,5);
gtk_container_add(GTK_CONTAINER(view),text);
buffer=gtk_text_view_get_buffer(GTK_TEXT_VIEW(text));

hbox=gtk_hbox_new(FALSE,0);
gtk_box_pack_start(GTK_BOX(vbox),hbox,FALSE,FALSE,5);

label=gtk_label_new("輸入:");
gtk_box_pack_start(GTK_BOX(hbox),label,FALSE,FALSE,5);

message_entry=gtk_entry_new();
gtk_box_pack_start(GTK_BOX(hbox),message_entry,FALSE,FALSE,5);

button=gtk_button_new_with_label("發送");
gtk_box_pack_start(GTK_BOX(hbox),button,FALSE,FALSE,5);
g_signal_connect(G_OBJECT(button),"clicked",
G_CALLBACK(on_send),NULL);

gtk_widget_show_all(window);

gdk_threads_enter();
gtk_main();
gdk_threads_leave();

return FALSE;
}