进程间通信

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实现父子进程间的通信

介绍: 1 .以结构体为传输目标 ,先定义一个枚举类型存放消息类型,定义一个结构体存放消息类型和该消息类型的结构体的大小,定义不同消息类型的消息的结构体

父进程写入消息,子进程读取消息

2 .创建管道父子进程,公有三个文件 pipe_main.c main函数文件创建管道的子父进程 pipe_mes.h 文件枚举的定义结构体的定义各种函数的声明

pipe_mes.c 函数的实现

具体代码段;

pipe_main.c:

#include<stdio.h>#include<stdlib.h>#include<string.h>#include<unistd.h>#include<errno.h>#include "pipe_mes.h"int main(int argc,char** argv){int fd[2];int pipe_result;if(pipe_result = pipe(fd));if(pipe_result == -1){printf("管道创建失败!\n");exit(errno);}pid_t child_pid;child_pid = fork();if(child_pid < 0){printf("创建子进程失败!\n");exit(errno);}else if(child_pid == 0){//进入子进程 并接受来自父进程的消息  解析并打印close(fd[1]);int i;for(i = 0; i < 3; i++){HMessage hm = (HMessage) malloc (sizeof(Message));read(fd[0],hm,sizeof(Message));switch(hm->msg_kind){case Type_1:{HMES_ONE M_ONE = ReadMes_ONE(fd[0],hm);printf("接收来自Type_1的消息: %d\n",M_ONE->num);}break;case Type_2:{HMES_TWO M_TWO = ReadMes_TWO(fd[0],hm);printf("接收来自Type_2的消息: %s\n",M_TWO->str);}break;case Type_3:{HMES_THREE M_THREE = ReadMes_THREE(fd[0],hm);printf("接收来自Type_3的消息:%d\t%s\n",M_THREE->num,M_THREE->str);}break;default:printf("不识别的消息类型.......请检查!\n");break;}}_exit(0);}close(fd[0]);//调用发送消息函数SendMes_ONE(fd[1],2017);SendMes_TWO(fd[1],"结束了!");SendMes_THREE(fd[1],2018,"开始了");return 0;}

pipe_mes.h

#ifndef __MESSAGE_H__#define __MESSAGE_H__//消息类型typedef enum KIND{Type_1,Type_2,Type_3}Msg_kind;//Message 是所有消息的共同首部typedef struct Message{Msg_kind msg_kind;size_t size;}Message,*HMessage;//消息 ONEtypedef struct TMessage_1{Message base;int num;}MES_ONE,*HMES_ONE;//消息 TWOtypedef struct TMessage_2{Message base;char str[1024];}MES_TWO,*HMES_TWO;//消息 THREEtypedef struct TMessage_THREE{Message base;int num;char str[1024];}MES_THREE,*HMES_THREE;//消息 ONE 接收和发送函数HMES_ONE ReadMes_ONE(int in,HMessage hm);size_t SendMes_ONE(int out,int num);//消息 TWO 接受和发送HMES_TWO ReadMes_TWO(int in,HMessage hm);size_t SendMes_TWO(int out,char* str);//消息 THREE 接受和发送HMES_THREE ReadMes_THREE(int in,HMessage hm);size_t SendMes_THREE(int out,int num,char *str);#endif

pipe_mes.c

#include<stdio.h>#include<stdlib.h>#include<string.h>#include<unistd.h>#include<errno.h>#include "pipe_mes.h"//消息 Type_1size_t SendMes_ONE(int out,int num){HMES_ONE Mes_One = (HMES_ONE) malloc (sizeof(MES_ONE));Mes_One->base.msg_kind = Type_1;Mes_One->base.size = sizeof(MES_ONE);Mes_One->num = num;return write(out,(char*)Mes_One,Mes_One->base.size);}HMES_ONE ReadMes_ONE(int in,HMessage HMES){HMES_ONE Mes_One = (HMES_ONE) malloc (sizeof(MES_ONE));memcpy(Mes_One,HMES,sizeof(Message));read(in,(char*)Mes_One + sizeof(Message),sizeof(MES_ONE) - sizeof(Message));return Mes_One;}//消息 Type_2size_t SendMes_TWO(int out,char* str){HMES_TWO Mes_Two = (HMES_TWO) malloc (sizeof(MES_TWO) + strlen(str));Mes_Two->base.msg_kind = Type_2;Mes_Two->base.size = sizeof(MES_TWO) + strlen(str);memcpy(Mes_Two->str,str,strlen(str) + 1);return write(out,(char*)Mes_Two,Mes_Two->base.size);}HMES_TWO ReadMes_TWO(int in,HMessage HMES){HMES_TWO Mes_Two = (HMES_TWO) malloc (HMES->size);memcpy(Mes_Two,HMES,sizeof(Message));read(in,Mes_Two->str,HMES->size - sizeof(Message));return Mes_Two;}//消息 Type_3size_t SendMes_THREE(int out,int num,char* str){HMES_THREE Mes_Three = (HMES_THREE) malloc (sizeof(MES_THREE) + strlen(str));Mes_Three->base.msg_kind = Type_3;Mes_Three->base.size = sizeof(MES_THREE) + strlen(str);Mes_Three->num = num;memcpy(Mes_Three->str,str,strlen(str) + 1);return write(out,(char *)Mes_Three,Mes_Three->base.size);}HMES_THREE ReadMes_THREE(int in,HMessage HMES){HMES_THREE Mes_Three = (HMES_THREE) malloc (HMES->size);memcpy(Mes_Three,HMES,sizeof(Message));read(in,(char*)Mes_Three + sizeof(Message),sizeof(MES_THREE) - sizeof(Message));return Mes_Three;}

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