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[];
    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();
    server_add.sin_addr.s_addr=htonl(INADDR_ANY);

    socketfid=socket(AF_INET,SOCK_STREAM,);
    printf("socket start \n");
    if (socketfid < ) {
        printf("socket error \n");
        return -;
    }
    printf("bind start \n");
    if(bind(socketfid,(struct sockaddr *)&server_add,sizeof(struct sockaddr))<){
        printf("bind error \n");
        return -;
    }
    //监听套接子
    printf("listen start \n");
    if(listen(socketfid,)<){
        printf("listen error \n");
        return -;
    }
    printf("accept start \n");
    while(){
        memset(&client_add, , sizeof(client_add));
        int leng=sizeof(client_add);
        int acceptresult=accept(socketfid,(struct sockaddr *) &client_add,&(leng));

        if (acceptresult < ) {
            printf("accept error %d  %d is sub\n", acceptresult,pid);
            //子进程结束了
            exit();
        }
        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 < ) {
            printf("pid<0\n");
            close(acceptresult);
        }
        else if(pid == ){
            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[];
    int readresult;
    while(){
        readresult=read(acceptpoint,buf,sizeof(buf));
        if(readresult<){
            printf("read error \n");
            close(acceptpoint);
            break;
        }
        else if (readresult==){
            printf("client exit \n");
            close(acceptpoint);
            break;
        }
        else{
            printf("client:%s\n", buf);
            if (strcmp("exit", buf) == ) {
                printf("exit \n");
                close(acceptpoint);
                return ;
            }

        }

    }
    return ;
}

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[];
    struct sockaddr_in  server_add;
    char * localaddr = "127.0.0.1";//
    server_add.sin_family=AF_INET;
    server_add.sin_port=htons();
    server_add.sin_addr.s_addr=htonl(INADDR_ANY);
    socketfid=socket(AF_INET,SOCK_STREAM,);
    while (connect(socketfid,(struct sockaddr*)&server_add,sizeof(server_add))==-){
      printf("Connect Error!\n");
    }
    char *data="hello word";
    printf("length %d!\n",sizeof(data));
    send( socketfid,data,sizeof(data),);
    printf("bind start \n");

    close(socketfid);

    return EXIT_SUCCESS;
}