嵌入式 简单的tcp_client程序可传入参数服务器的IP和PORT，接受buf并存储文件

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <errno.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <fcntl.h>#define MAX_DATA_LEN 10240#define UPDATA_FILE_PATH "./new_updata"int joseph_update_version(char *jrm_ip,char *jrm_port);int joseph_update_version(char *jrm_ip,char *jrm_port){    int sockfd, n, ret, filefd, seat;    char recvbuffer[MAX_DATA_LEN] = {0};    struct sockaddr_in servaddr;    int data_len = 0;    seat = 0;        if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)    { printf("create socket error:%s(errno:%d)\n", strerror(errno), errno);  return -1;      }      memset(&servaddr, 0, sizeof(servaddr));    servaddr.sin_family = AF_INET;      servaddr.sin_port = htons(atoi(jrm_port));     if( inet_pton(AF_INET, jrm_ip, &servaddr.sin_addr) <= 0)    {   printf("inet_pton error for %s\n",jrm_ip);return -1;       }      if(connect(sockfd, (struct sockaddr*)&servaddr, sizeof(servaddr)) < 0)    {  printf("connect error: %s(errno: %d)\n",strerror(errno),errno); return -1;      }    //recive package from server    recv(sockfd, (void *)&data_len, 4, 0);    data_len = htonl(data_len);    ret = recv(sockfd, recvbuffer, data_len, 0);    recvbuffer[data_len] = '\0';    if(ret > 0){printf("sock ret = %d\n",ret);filefd = open(UPDATA_FILE_PATH,\O_WRONLY | O_CREAT | O_TRUNC, 777);    }    do{printf("recvbuffer = %s\n", recvbuffer + seat);ret = write(filefd, recvbuffer + seat, data_len - seat);seat += ret;    }while((data_len - seat) != 0);    //    close(filefd);    system("./new_updata");        close(sockfd);      return 0;}int main(int argc, char *argv[]){    joseph_update_version(argv[1],argv[2]);    return 0;}