linux inet_ntoa()函数返回值问题__servaddr_fromaddr_sockfd_sin_addr_include_

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linux inet_ntoa()函数返回值问题

来源: 互联网发布时间：2016-07-09

本文导语: 本人写代码于下： #include #include #include #include #include #include typedef struct _nvdContent { unsigned char nvdFlag; char content[512]; } NvdContent; int main() { int sockfd,n; struct sockaddr_in servaddr,froma...

本人写代码于下：

#include
#include
#include
#include
#include
#include

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("flasfjn");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 %dn",b);
    printf("b is %sn",b);

#ifdef BEN_DEBUG
   printf("##########fromaddr.sin_addr is %s+++++++++++++++n",inet_ntoa(fromaddr.sin_addr));
#endif
int a;
    a=setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST,&option, sizeof(option));
    if(a==-1){printf("flasfjn");return -1;}
    while(1)
    {
    sleep(1);
    strcpy(buf,"hellon");
    len=sizeof(servaddr);
    n=sendto(sockfd,buf,1024,0,(struct sockaddr *)&servaddr,len);
    len=sizeof(fromaddr);
    FD_ZERO(&rset);
    FD_SET(sockfd, &rset);
    wset = rset;
    tval.tv_sec = 1;
    tval.tv_usec = 0;  //timeout is 2 seconds
    #ifdef BEN_DEBUG
   printf("##########fromaddr.sin_addr is %s+++++++++++++++n",inet_ntoa(fromaddr.sin_addr));
#endif
if (select(sockfd + 1, &rset, NULL, NULL, &tval )