Linux系统.doc

Linux系统下编程作业班 级： 姓 名： 学 号： 1. 编写一个文件读写的例子，将自己的名字，学号写入一个文本文件中，并读出来。程序代码：#includemain()FILE *fp;char ch;if(fp=fopen(1.txt,wt+)=NULL)printf(Cannot open file strike any key exit!);getch();exit(1);printf(input a string:n);ch=getchar();while (ch!=n)/这里用回车表示文件写入结束，你可以设置其他的字符，但是必须有结束的标示符。fputc(ch,fp);ch=getchar();rewind(fp);ch=fgetc(fp);while(ch!=EOF)putchar(ch);ch=fgetc(fp);printf(n);fclose(fp);程序运行结果2. 编写一个三线程的例子运行时间分别为100ms200ms300ms程序：#include#include#includePthread_mutex_t mutex=PTHREAD_INITIALIZER;Pthread_cond_t cond=PEHREAD_COND_INITIALIZER;Void*thread1(void*);Void*thread2(void*);Void*thread3(void*);Int i=1;Int main()Pthread_t t1;Pthread_t t2;Pthread_t t3;Pthread_creath(&t1,NULL,.thread1,（void*）NULL);Pthread_creath(&t2,NULL,.thread2,（void*）NULL);Pthread_creath(&t3,NULL,.thread3,（void*）NULL);Pthread_join(t1,NULL);Pthread_join(t2,NULL);Pthread_join(t3,NULL);Exit(0);Printf(“线程1被创建”n);Printf(“线程2被创建”n);Printf(“线程3被创建”n);For(i=1;i=4;i+);If(i=1)Printf(“thread1:Im thread 1”n)Sleep(0.1);Printf(“我已经延迟100毫秒了！”);If(i=2)(Printf(thread2:Im thread 2”n)Sleep（0.2）Printf（”我已经延迟200毫秒了！”）；If（i=3）Printf（”Im thread 3”）;Sleep(0.3);Printf（”线程1已经结束n”）;Printf（”线程2已经结束n”）;Printf（”线程3已经结束n”）;运行结果3. 编写一个进程之间使用消息队列进行通信的例子程序：sen.c#include#include#include#include#include#include#include#include#define BUF_SIZE 256#define PROJ_ID 32#define PATH_NAME /tmp#define SEND_MSG 1#define RECEIVE_MSG 2int main(void)struct mymsgbuflong msgtype;char messageBUF_SIZE;msgbuf;int queueid;int msglen;if(queueid = msgget(1234,IPC_CREAT|0660) = -1)perror(msgget error!n);exit(1);while(1)printf(send:);fgets(msgbuf.message,BUF_SIZE,stdin);/从标准输入读取字符存至messageif(strncmp(end,msgbuf.message,3) = 0)msgctl(queueid,IPC_RMID,NULL);break;msgbuf.messagestrlen(msgbuf.message)-1 = 0;msgbuf.msgtype = SEND_MSG;if(msgsnd(queueid,&msgbuf,strlen(msgbuf.message)+1,0) = -1)perror(Send msgsnd error!n);exit(1);if(msgrcv(queueid,&msgbuf,BUF_SIZE,RECEIVE_MSG,0) = -1)/缓冲区的大小，请求读取消息的类型perror(Send msgrcv errorn);exit(1);printf(receive: %sn,msgbuf.message);exit(0);receive.c#include#include#include#include#include#include#include#include#define BUF_SIZE 256#define PROJ_ID 32#define PATH_NAME /tmp#define SEND_MSG 1#define RECEIVE_MSG 2int main(void)struct mymsgbuflong msgtype;char messageBUF_SIZE;msgbuf;int queueid;int msglen;if(queueid = msgget(1234,IPC_CREAT|0660) = -1)perror(msgget eror!n);exit(1);while(1)if(msgrcv(queueid,&msgbuf,BUF_SIZE,SEND_MSG,0) = -1)perror(Send msgrcv error!n);exit(1);printf(this is what you sent:%sn,msgbuf.message);printf(Message received from 3196);fgets(msgbuf.message,BUF_SIZE,stdin);if(strncmp(end,msgbuf.message,3) = 0)msgctl(queueid,IPC_RMID,NULL);break;msgbuf.messagestrlen(msgbuf.message)-1=0