linux inet_ntoa()函数返回值问题

本人写代码于下：

#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>
#include <unistd.h>
#include <sys/select.h>

typedef struct _nvdContent {
        unsigned char nvdFlag;
        char content[512];
} NvdContent;

int main()
{
int sockfd,n;
struct sockaddr_in servaddr,fromaddr;
    socklen_t len;
    char buf[1024],string[1024], temp[1024], *pChar;
    NvdContent nvdBuf;
    int option=1, tmp=0xFFFFFFFF;
    unsigned int i;
    fd_set rset, wset;
    struct timeval tval;
    int file;
sockfd = socket(AF_INET, SOCK_DGRAM, 0);     
  if(sockfd==-1){printf("flasfj\n");return -1;}
  memset(&servaddr, 0, sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_port = htons(55566);
  memcpy((void*)&servaddr.sin_addr, (void*)&tmp, 4);
 
  char *b= inet_ntoa(fromaddr.sin_addr);  printf("*b is %d\n",b);
  printf("b is %s\n",b);
 
#ifdef BEN_DEBUG
  printf("#########