Linux multi-threaded programming [server] send bit stream

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <pthread.h>

static int PORT = 8000;
const int LISTENQ = 1024;
static int bit = 10;
static char* addr_ip = NULL;

void *thread_run(void *arg);

int main(int argc,char**argv)
{
    
    
    for(int i=1;i<argc -1;i++)
    {
    
    
        if(strncmp(argv[i],"-p",2)==0){
    
    
            PORT = atoi(argv[i + 1]);
            if(PORT<=0){
    
    
                printf("PORT:%d error\n",PORT);
                return -1;
            }
            printf("PORT:%d\n",PORT);
        }
        if(strncmp(argv[i],"-b",2)==0){
    
    
            bit = atoi(argv[i+1]);
            if(bit<=0){
    
    
                printf("bit:%d error\n",bit);
                return -1;
            }
            printf("bit:%d\n",bit);
        }
        if(strncmp(argv[i],"-s",2)==0){
    
    
            addr_ip = (char*)malloc(sizeof(char)*128);
            memmove(addr_ip,argv[i+1],strlen(argv[i+1]) + 1);
            printf("%s\n",addr_ip);
            if(bit<=0){
    
    
                printf("bit:%d error\n",bit);
                return -1;
            }
            printf("bit:%d\n",bit);
        }
    }
    /*声明服务器地址和客户 协议族 */
    struct sockaddr_in servaddr,cliaddr;
	
    int listenfd,connfd;
	
    pid_t childpid;
    socklen_t clilen;
	
	
    /*(1) 初始化监听套接字listenfd*/
    listenfd = socket(AF_INET,SOCK_STREAM,0);
    if(listenfd<0)
    {
    
    
        perror("socket error");
        exit(1);
    }
    /*(2) 设置服务器协议族sockaddr_in结构*/
    bzero(&servaddr,sizeof(servaddr));

    servaddr.sin_family = AF_INET;
    if(addr_ip==NULL){
    
    
        servaddr.sin_addr.s_addr = htonl(INADDR_ANY);   //表明可接受任意IP地址
    }
    else{
    
    
        if(inet_pton(AF_INET , addr_ip , &servaddr.sin_addr) < 0){
    
    
		    printf("inet_pton error for %s\n",addr_ip);
		    exit(1);
	    }
    }
    servaddr.sin_port = htons(PORT);

    /*(3) 绑定套接字和端口*/
    if(bind(listenfd,(struct sockaddr*)&servaddr,sizeof(servaddr))<0)
    {
    
    
        perror("bind error");
        exit(1);
    }

    /*(4) 监听客户请求*/
    if(listen(listenfd,LISTENQ)<0)
    {
    
    
        perror("listen error");
        exit(1);
    }
	printf("bind and listen success!wait accept...\n");
    while (1)
    {
    
    
        clilen = sizeof(cliaddr);
        connfd=accept(listenfd , (struct sockaddr *)&cliaddr , &clilen);
        if(connfd<0)
        {
    
    
            perror("accept error");
            exit(1);
        }
		printf("Connect from %s:%u \n",inet_ntoa(cliaddr.sin_addr),ntohs(cliaddr.sin_port)); 
        pthread_t id;
		//新建子进程单独处理链接
        pthread_create(&id,NULL,thread_run,(void*)&connfd);
        pthread_detach(id);
    }
    /*(6) 关闭监听套接字*/
    close(listenfd);
    return 0;
}

void *thread_run(void *arg)
{
    
    
    printf("creat a new thread\n");
    int fd = *(int*)arg;
    char* buf = (char*)malloc(bit*sizeof(char) + 1);
    memset(buf,'1',bit);
    printf("fd:%d\nbuf:%s\n",fd,buf);
    struct timeval timeout;
    // timeout.tv_sec=0;
    // timeout.tv_usec = 500000;
    timeout.tv_sec=1;
    timeout.tv_usec = 0;
    int ret = setsockopt(fd,SOL_SOCKET,SO_RCVTIMEO,&timeout,sizeof(timeout));   //设置recv超时时间为1s
    while (1)
    {
    
    
        /* code */
        int flag = send(fd,buf,bit,0);
        // printf("send size:%d\n",flag);
        // usleep(1000000);
        ret = recv(fd,buf,1,0);
        if(ret==0){
    
    
            printf("断开连接\n");
            break;
        }
        if(ret == -1)
        {
    
    
            if(errno == EWOULDBLOCK)
            {
    
    
                printf("超时\n");
            }
        }
    }
	close(fd);
}