c socket 开发测试

c语言异常

参照他人代码写一个tcp的 socket 开发测试

异常A，在mac osx系统下编译失败，缺库转到debian下。

异常B，include引用文件顺序不对，编译大遍异常

异常C,/usr/include/x86_64-linux-gnu/sys/types.h:34:1: error: unknown type name ‘__u_char’ 文件前注释的问题，删掉注释则通过

 服务端

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h> 

#include <stdlib.h>

#include <string.h>

#include <pthread.h>

#include <errno.h>

#include <stdio.h>

int accepthandle(int acceptpoint);

int main(void) {

    //服务端socket

    int socketfid;

    char buf[1024];

    struct sockaddr_in  server_add;

    char * localaddr = "127.0.0.1";//

    int pid;

    struct sockaddr_in client_add;



    server_add.sin_family=AF_INET;

    server_add.sin_port=htons(29001);

    server_add.sin_addr.s_addr=htonl(INADDR_ANY);

    

    socketfid=socket(AF_INET,SOCK_STREAM,0);

    printf("socket start \n");

    if (socketfid < 0) {

        printf("socket error \n");

        return -1;

    }

    printf("bind start \n");

    if(bind(socketfid,(struct sockaddr *)&server_add,sizeof(struct sockaddr))<0){

        printf("bind error \n");

        return -1;

    }

    //监听套接子

    printf("listen start \n");

    if(listen(socketfid,24)<0){

        printf("listen error \n");

        return -1;

    }

    printf("accept start \n");

    while(1){

        memset(&client_add, 0, sizeof(client_add));

        int leng=sizeof(client_add);

        int acceptresult=accept(socketfid,(struct sockaddr *) &client_add,&(leng));

       

        if (acceptresult < 0) {

            printf("accept error %d  %d is sub\n", acceptresult,pid);

            //子进程结束了

            exit(0);

        }

        printf("clent addr%s porit %d\n",

               inet_ntop(AF_INET, &client_add.sin_addr, buf, sizeof(buf)),

               ntohs(client_add.sin_port));

        pid = fork();

        printf("%d\n",pid);

        if (pid < 0) {

            printf("pid<0\n");

            close(acceptresult);

        }

        else if(pid == 0){

            printf("pid=0 is sub \n");

            //子进程停止监听，去处理接收数据

            close(socketfid);

            //子进程到了这里，执行完接收后，继续执行while 但是因为socketfid 已经关闭，accept 返回异常 -1 直接执行exit(0) 退出了子进程

            accepthandle(acceptresult);

        } else{

            //父进程到了这里，执行完这一步，继续while　到accept这里，又被阻塞。如此循环。

            //这里错打印不出结果，可能是shell只能展示一个进程的内容。

           printf("pid is parent\n");

        }

 }

    return EXIT_SUCCESS;

}

int accepthandle(int acceptpoint){

    char buf[1024];

    int readresult;

    while(1){

        readresult=read(acceptpoint,buf,sizeof(buf));

        if(readresult<0){

            printf("read error \n");

            close(acceptpoint);

            break;

        }

        else if (readresult==0){

            printf("client exit \n");

            close(acceptpoint);

            break;

        }

        else{

            printf("client:%s\n", buf);

            if (strcmp("exit", buf) == 0) {

                printf("exit \n");

                close(acceptpoint);

                return 0;

            }

            

        }

        

        

    }

    return 0;

}

 

client

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h> 

#include <stdlib.h>

#include <string.h>

#include <errno.h>

#include <stdio.h>

int main(void) {

    int socketfid;

    char buf[1024];

    struct sockaddr_in  server_add;

    char * localaddr = "127.0.0.1";//

    server_add.sin_family=AF_INET;

    server_add.sin_port=htons(29001);

    server_add.sin_addr.s_addr=htonl(INADDR_ANY);

    socketfid=socket(AF_INET,SOCK_STREAM,0);

    while (connect(socketfid,(struct sockaddr*)&server_add,sizeof(server_add))==-1){

      printf("Connect Error!\n");

    }

    char *data="hello word";

    printf("length %d!\n",sizeof(data));

    send( socketfid,data,sizeof(data),0);

    printf("bind start \n");



    close(socketfid);

  

   

    return EXIT_SUCCESS;

}