常用函数
c
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//创建/获取消息队列
int msgget (key_t key, int msgflg);
/*
key : 为键值,ftok();
msgflg:
IPC_CREAT - 创建,不存在即创建,已存在即获取,除非...
IPC_EXCL - 排斥,已存在即失败。
*/
// 向消息队列发送消息
int msgsnd (int msqid, const void* msgp,size_t msgsz, int msgflg);
/*
msqid : msgget()返回
msgp : 包含消息类型和消息数据的内存块.前4个字节必须是一个大于0的整数,代表消息类型,其后消息数据
msgsz:不包括消息类型的,只算消息数据的内存大小
msgflg :IPC_NOWAIT内核中的消息队列缓冲区没有足够的空闲空间时,此函数不会阻塞,而是返回-1
*/
//从消息队列接收消息
ssize_t msgrcv (int msqid, void* msgp, size_t msgsz,long msgtyp, int msgflg);
/*
msqid : msgget()返回
msgp : 包含消息类型和消息数据的内存块
smgsz:接收的内存大小,如果接收到的内存>smgsz,则只会截取内存大小部分
msgtyp:
=0 - 返回消息队列中的第一条消息。
>0 - 若msgflg参数不包含MSG_EXCEPT位,则返回消息队列中第一个类型为msgtyp的消息,若msgflg参数包含MSG_EXCEPT位,则返回消息队列中第一个类型不为msgtyp的消息。
<0 - 返回消息队列中类型小于等于msgtyp的绝对值的消息,若有多个,则取类型最小者。
*/
//销毁/控制消息队列
int msgctl (int msqid, int cmd, struct msqid_ds* buf);
/*
IPC_STAT
获取消息队列的属性
IPC_SET
设置消息队列的属性
IPC_RMID - 立即删除消息队列。
此时所有阻塞在对该消息队列的,msgsnd和msgrcv函数调用,都会立即返回失败,errno为EIDRM。
*/
例子
为了展示例程,部分代码删减,且多个文件合并了,开发过程中,请不要模仿,这样不规范。
server
c
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#include "server.h"
#include "server_function.h"
#include "fileoper.h"
#include "slinklist.h"
#include <stdbool.h>
#include <signal.h>
#include <assert.h>
#include "client.h"
/*typedef struct Msg{
int type;
char msg[1024];
}Msg;
typedef struct Back{
int type;
char msg[1024];
}Back;*/
#define PATH "/home/zhizhen/项目/本地银行"
#define SERVER 100
#define CLIENT 101
int id1 ,id2;
Slink list = NULL;
Slink node = NULL;
void myexit(int sig){
file_write(list);
slink_destory(list);
des_msg(id1);
des_msg(id2);
printf("退出成功\n");
exit(0);
}
int server_run(){
list = slink_create();
assert(list != NULL);
file_read(list);
int id1 = create_msg(PATH,SERVER);
int id2 = create_msg(PATH,CLIENT);
assert(id1 != -1 && id2 != -1);
while(1){
signal(SIGINT,myexit);
Msg msg = {};//后面定义的,接收的消息的结构体
Back back = {};
int ret = 0;
size_t msgsz = 0;
//接收消息
ssize_t sz = recv_msg(id1,(void *)&msg,sizeof(msg.msg));
assert(sz != -1);
if(sz == 0){
printf("该用户退出了\n");
node = NULL;
}
int opt = msg.type;
switch(opt){
case R:
msgsz = recv_Reg(&msg,&back,list);
break;
case E:
node = recv_Ent(&msg,&back,list);
msgsz = sizeof(B_Ent);
break;
case G:
msgsz = recv_GetM(&msg,&back,list,node);
break;
case S:
msgsz = recv_SaveM(&msg,&back,list,node);
break;
case T:
msgsz = recv_TranM(&msg,&back,list,node);
break;
case C:
msgsz = recv_ChgP(&msg,&back,list,node);
break;
case D:
msgsz = recv_Des(&msg,&back,list,node);
break;
}
Slink next1 = list->next;
int i = 1;
while(next1 != NULL){
Client *p = (Client *)(next1->elem);
printf("-------------------\n");
printf("*******%d*******\n",i);
i++;
printf("id:%s\n",p->id);
printf("name:%s\n",p->name);
printf("password:%s\n",p->password);
printf("tel:%s\n",p->tel);
printf("money:%d\n",p->money);
printf("------------------\n");
next1 = next1->next;
}
ret = send_msg(id2,(const void *)&back,msgsz);//发送反馈
assert(ret != -1);
}
}
client
c
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#include "client.h"
#include <stdbool.h>
#include <assert.h>
static void menu(){
printf("--------%d.注册\n",R);
printf("--------%d.登录\n",E);
printf("--------非%d和%d即:退出\n",R,E);
printf(">>>>\n");
}
static void menu_Ent(){
printf("******%d.取钱\n",G);
printf("******%d.充值\n",S);
printf("******%d.转账\n",T);
printf("******%d.修改密码\n",C);
printf("******%d.销户\n",D);
printf("*******0.退出\n");
printf(">>>>>\n");
}
/*typedef struct Msg{
int type;
char msg[1024];
}Msg;
typedef struct Back{
int type;
char msg[1024];
}Back;*/
int create_msg(char *s,int id){
key_t key = ftok(s,id);
assert(key != -1);
return msgget(key,IPC_CREAT|0644);
}
int send_msg(int msqid,const void *msg,size_t msgsz){
return msgsnd(msqid,msg,msgsz,0);
}
int recv_msg(int msqid,void *msg,size_t msgsz){
return msgrcv(msqid,msg,msgsz,0,0);
}
int des_msg(int msqid){
return msgctl(msqid,IPC_RMID,NULL);
}
int client_run(){
int id1 = create_msg(PATH,SERVER);
int id2 = create_msg(PATH,CLIENT);
assert(id1 != -1 && id2 != -1);
Beg:
while(1){
Msg msg = {};
size_t msgsz = 0;
Back back = {};
int ret = 0;
menu();
int opt = 0;
scanf("%d",&opt);
switch(opt){
case R:
msgsz = send_Reg(&msg);
break;
case E:
msgsz = send_Ent(&msg);
break;
default:
printf("退出成功\n");
exit(0);
break;
}
ret = send_msg(id1,(const void *)&msg,msgsz);
assert(ret != -1);
ret = recv_msg(id2,(void *)&back,sizeof(back.msg));
assert(ret != -1);
opt = back.type;
switch(opt){
case R:
back_Reg(&back);
break;
case E:{
if(back_Ent(&back) == 1){
while(1){
menu_Ent();
int opt = 0;
Msg msg = {};
Back back = {};
size_t msgsz = 0;
scanf("%d",&opt);
switch(opt){
case G:
msgsz = send_GetM(&msg);
break;
case S:
msgsz = send_SaveM(&msg);
break;
case T:
msgsz = send_TranM(&msg);
break;
case C:
msgsz = send_ChgP(&msg);
break;
case D:
msgsz = send_Des(&msg);
break;
default:
goto Beg;
printf("退出成功!\n");
break;
}
ret = send_msg(id1,(const void *)&msg,msgsz);
assert(ret != -1);
ret = recv_msg(id2,&back,sizeof(back.msg));
assert(ret != -1);
opt = back.type;
switch(opt){
case G:
back_GetM(&back);
break;
case S:
back_SaveM(&back);
break;
case T:
back_TranM(&back);
break;
case C:
back_ChgP(&back);
break;
case D:
back_Des(&back);
break;
}
}
}else{
printf("登录失败!\n");
}
break;
}
}
}
}