#include?	//?頭文件
#include?
#include?
#include??//定義數(shù)據(jù)結(jié)構(gòu)sockaddr_in
#include??//定義socket函數(shù)以及數(shù)據(jù)結(jié)構(gòu)??Socket的英文原義是“孔”或“插座”，用于描述IP地址和端口，是一個(gè)通信鏈的句柄，可以用來(lái)實(shí)現(xiàn)不同虛擬機(jī)或不同計(jì)算機(jī)之間的通信
#include?
#include?
#include?
#include?
#include?
#include?
#include
#include?
#include??
#include?
GtkWidget?*window;???//登錄窗口
GtkWidget?*home;	//主窗口
int?clientfdb_file;
struct?sockaddr_in?clientaddr;?
char?user_name[50];
char?fname[]=“/var/tmp/“;
int?sem_id;?

int?init_sem（int?sem_id?int?init_value）{
	union?semun{
		int?val;
		struct?semid_ds?*buf;
		unsigned?short?*array;
	};
	union?semun?sem_union;
	sem_union.val?=?init_value;
	if（semctl（sem_id?0?SETVAL?sem_union）?==?-1）{
		perror（“Initialize?semaphore“）;
		return?-1;
	}
	return?0;
}
int?del_sem（int?sem_id）{
	union?semun{
		int?val;
		struct?semid_ds?*buf;
		unsigned?short?*array;
	};
	union?semun?sem_union;
	if（semctl（sem_id?1?IPC_RMID?sem_union）==-1）{
		perror（“Delete?semaphore“）;
		return?-1;
	}
}
//P?操作函數(shù)
int?sem_p（int?sem_id）{
	struct?sembuf?sem_b;
	sem_b.sem_num?=?0;
	sem_b.sem_op?=?-1;
	sem_b.sem_flg?=?SEM_UNDO;
	if（semop（sem_id?&sem_b?1）==-1）{
		perror（“P?operation“）;
		return?-1;
	}
	return?0;
}
//V?操作函數(shù)
int?sem_v（int?sem_id）{
	struct?sembuf?sem_b;
	sem_b.sem_num?=?0;
	sem_b.sem_op?=?1;
	sem_b.sem_flg?=?SEM_UNDO;
	if（semop（sem_id?&sem_b?1）?==?-1）{
		perror（“V?operation“）;
		return?-1;
	}
	return?0;
}


//處理登錄
void?deal_pressed（GtkWidget?*button?gpointer?entry）{
	int?sendbytes;
	char?*buff;
	struct?hostent?*host;
	char?wel[]=“Welcome“;
	//host?=?gethostbyname（“127.0.0.1“）;???//本地地址
	host?=?gethostbyname（“127.0.0.1“）;

????????buff?=?（char?*）malloc（9）;
	
	const?gchar??*text?=?gtk_entry_get_text（GTK_ENTRY（entry））;
	if（strlen（text）==0）{
		printf（“不能為空\(chéng)n“）;?????????//?提示?不能為空
	}
	else{	
		if?（（clientfd?=?socket（AF_INET?SOCK_STREAM?0））?==?-1）
		{
			perror（“fail?to?create?socket“）;
			exit（1）;
		}
		bzero（&clientaddr?sizeof（clientaddr））;
		clientaddr.sin_family?=?AF_INET;????//創(chuàng)建套接字時(shí)，用該字段指定地址家族，對(duì)于TCP/IP協(xié)議的，必須設(shè)置為AF_INET
		clientaddr.sin_port?=?htons（（uint16_t）atoi（“8787“））;
		clientaddr.sin_addr?=?*（（struct?in_addr?*）host->h_addr）;//host->h_addr?是一個(gè)?char*，需要的是?struct?in_addr?*。因此，我轉(zhuǎn)換host->h_addr?成?struct?in_addr?*，這是個(gè)指針，取他的內(nèi)容，即?*，然后賦給左邊?
	
		if?（connect（clientfd?（struct?sockaddr?*）&clientaddr?sizeof（struct?sockaddr））?==?-1）
		{
			perror（“fail?to?connect“）;
			exit（1）;
		}
		if?（（sendbytes?=?send（clientfd?text?strlen（text）?0））?==?-1）
		????{
			perror（“fail?to?send“）;
			exit（1）;
		????}

		if?（recv（clientfd?buff?7?0）?==?-1）
		{
			perror（“fail?to?recv“）;
			exit（1）;
		}
		if（strcmp（buffwel）==0）{
			strcpy（user_nametext）;
			gtk_widget_destroy（window）;		
		}else{
			//??彈窗?提醒?提示?昵稱(chēng)重復(fù)
			GtkWidget?*dialog;
			dialog?=?gtk_m