main_cli.c

linux下socket编程示例,通过网络传送控制信息给下位机

  
/*.......................................................*/

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

  
  #define PORT 3497  /* the port client will be connecting to */

typedef union cmd_tmp{
/**/
	unsigned char cmd_buf_char[64];
/**/
	struct abc{
		int head;/*0x55aaaa55*/
		int length;/*64*/
		int modulation;
		int vpi;
		int vci;
		char info[64-20];
	}cmd_strcut;
} mips_arm;



extern int adsl2_printf(int len,char *buf);

int main(int argc, char *argv[]){

    int sockfd, numbytes, sendsize;
    struct hostent *he;
    struct sockaddr_in their_addr; /* connector's address information */

    mips_arm cmd_buf;
    
    if(argc<4){
	printf("  socket_set_cli <modulation> <vpi> <vci> \n");
	return 0;
    }else{
	cmd_buf.cmd_strcut.head = 0x55aaaa55;
	cmd_buf.cmd_strcut.length = 64;
	cmd_buf.cmd_strcut.modulation = strtol(&argv[1][0], NULL, 10);
	cmd_buf.cmd_strcut.vpi = strtol(&argv[2][0], NULL, 10);
	cmd_buf.cmd_strcut.vci = strtol(&argv[3][0], NULL, 10);

 	printf("set adsl modulation: %d\n", cmd_buf.cmd_strcut.modulation);
    	printf("set adsl vpi %d, vci %d\n", cmd_buf.cmd_strcut.vpi, cmd_buf.cmd_strcut.vci);
    }

    he=gethostbyname("192.168.1.252");

    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
        perror("socket");
        exit(1);
    }

    their_addr.sin_family = AF_INET;   /* host byte order */

    their_addr.sin_port = htons(PORT);  /* short, network byte order */

    their_addr.sin_addr = *((struct in_addr *)he->h_addr);

    bzero(&(their_addr.sin_zero), 8);   /* zero the rest of the struct */

    if (connect(sockfd, (struct sockaddr *)&their_addr, sizeof(struct sockaddr)) == -1) {
        perror("connect");
        exit(1);
    }
    printf("connect ok\n");
    sendsize=64;
    if ((numbytes = send(sockfd, cmd_buf.cmd_buf_char , sendsize, 0)) == -1){
	perror("send");
	printf("send 2 e\n");
	return 0;
    }
    printf("send ok\n");
    return 0;
  }