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时间:2020-06-18
《Linux系统编程实验六:进程间通信.doc》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、实验六:进程间通信l实验目的:学会进程间通信方式:无名管道,有名管道,信号,消息队列,l实验要求:(一)在父进程中创建一无名管道,并创建子进程来读该管道,父进程来写该管道(二)在进程中为SIGBUS注册处理函数,并向该进程发送SIGBUS信号(三)创建一消息队列,实现向队列中存放数据和读取数据l实验器材:软件:安装了Linux的vmware虚拟机硬件:PC机一台l实验步骤:(一)无名管道的使用1、编写实验代码pipe_rw.c#include#include#include#include2、tdio.h>#include#includeintmain(){intpipe_fd[2];//管道返回读写文件描述符pid_tpid;charbuf_r[100];char*p_wbuf;intr_num;memset(buf_r,0,sizeof(buf_r));//将buf_r初始化charstr1[]=”parentwrite1“holle””;charstr2[]=”parentwrite2“pipe””;r_num=30;/*创建管道*/if(pipe(pipe_fd)<0){printf("pip3、ecreateerror");return-1;}/*创建子进程*/if((pid=fork())==0)//子进程执行代码{//1、子进程先关闭了管道的写端close(pipe_fd[1]);//2、让父进程先运行,这样父进程先写子进程才有容读sleep(2);//3、读取管道的读端,并输出数据if(read(pipe_fd[0],buf_r,r_num)<0){printf(“readerror!”);exit(-1);}printf(“%s”,buf_r);//4、关闭管道的读端,并退出close(pipe_fd[1]);}elseif(pi4、d>0)//父进程执行代码{//1、父进程先关闭了管道的读端close(pipe_fd[0]);//2、向管道写入字符串数据p_wbuf=&str1;write(pipe_fd[1],p_wbuf,sizof(p_wbuf));p_wbuf=&str2;write(pipe_fd[1],p_wbuf,sizof(p_wbuf));//3、关闭写端,并等待子进程结束后退出close(pipe_fd[1]);}return0;}/***********************#include#include#inc5、lude#include#include#includeintmain(){intpipe_fd[2];//管道返回读写文件描述符pid_tpid;charbuf_r[100];char*p_wbuf;intr_num;memset(buf_r,0,sizeof(buf_r));//将buf_r初始化charstr1[]="holle";charstr2[]="pipe";r_num=10;/*创建管道*/if(pipe(pipe_fd)<0){printf("pipecreate6、error");return-1;}/*创建子进程*/if((pid=fork())==0)//子进程执行代码{close(pipe_fd[1]);//1、子进程先关闭了管道的写端//2、让父进程先运行,这样父进程先写子进程才有容读//3、读取管道的读端,并输出数据if(read(pipe_fd[0],buf_r,r_num)<0){printf("read1error!");exit(-1);}printf("parentwrite1%s!",buf_r);sleep(1);if(read(pipe_fd[0],buf_r,r_num)<0){p7、rintf("read2error!");exit(-1);}printf("parentwrite2%s!",buf_r);close(pipe_fd[1]);//4、关闭管道的读端,并退出exit(1);//printf("childerror!");}elseif(pid>0)//父进程执行代码{close(pipe_fd[0]);//1、父进程先关闭了管道的读端p_wbuf=str1;//2、向管道写入字符串数据write(pipe_fd[1],p_wbuf,sizeof(str1));sleep(1);p_wbuf=str2;write(pi8、pe_fd[1],p_wbuf,sizeof(str2));clo
2、tdio.h>#include#includeintmain(){intpipe_fd[2];//管道返回读写文件描述符pid_tpid;charbuf_r[100];char*p_wbuf;intr_num;memset(buf_r,0,sizeof(buf_r));//将buf_r初始化charstr1[]=”parentwrite1“holle””;charstr2[]=”parentwrite2“pipe””;r_num=30;/*创建管道*/if(pipe(pipe_fd)<0){printf("pip
3、ecreateerror");return-1;}/*创建子进程*/if((pid=fork())==0)//子进程执行代码{//1、子进程先关闭了管道的写端close(pipe_fd[1]);//2、让父进程先运行,这样父进程先写子进程才有容读sleep(2);//3、读取管道的读端,并输出数据if(read(pipe_fd[0],buf_r,r_num)<0){printf(“readerror!”);exit(-1);}printf(“%s”,buf_r);//4、关闭管道的读端,并退出close(pipe_fd[1]);}elseif(pi
4、d>0)//父进程执行代码{//1、父进程先关闭了管道的读端close(pipe_fd[0]);//2、向管道写入字符串数据p_wbuf=&str1;write(pipe_fd[1],p_wbuf,sizof(p_wbuf));p_wbuf=&str2;write(pipe_fd[1],p_wbuf,sizof(p_wbuf));//3、关闭写端,并等待子进程结束后退出close(pipe_fd[1]);}return0;}/***********************#include#include#inc
5、lude#include#include#includeintmain(){intpipe_fd[2];//管道返回读写文件描述符pid_tpid;charbuf_r[100];char*p_wbuf;intr_num;memset(buf_r,0,sizeof(buf_r));//将buf_r初始化charstr1[]="holle";charstr2[]="pipe";r_num=10;/*创建管道*/if(pipe(pipe_fd)<0){printf("pipecreate
6、error");return-1;}/*创建子进程*/if((pid=fork())==0)//子进程执行代码{close(pipe_fd[1]);//1、子进程先关闭了管道的写端//2、让父进程先运行,这样父进程先写子进程才有容读//3、读取管道的读端,并输出数据if(read(pipe_fd[0],buf_r,r_num)<0){printf("read1error!");exit(-1);}printf("parentwrite1%s!",buf_r);sleep(1);if(read(pipe_fd[0],buf_r,r_num)<0){p
7、rintf("read2error!");exit(-1);}printf("parentwrite2%s!",buf_r);close(pipe_fd[1]);//4、关闭管道的读端,并退出exit(1);//printf("childerror!");}elseif(pid>0)//父进程执行代码{close(pipe_fd[0]);//1、父进程先关闭了管道的读端p_wbuf=str1;//2、向管道写入字符串数据write(pipe_fd[1],p_wbuf,sizeof(str1));sleep(1);p_wbuf=str2;write(pi
8、pe_fd[1],p_wbuf,sizeof(str2));clo
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