printf's problem under uclinux

[Altera_Forum]

I wrote a socket program like below:# include <sys/types.h># include <sys/socket.h># include <sys/ioctl.h># include <sys/time.h># include <netinet/in.h># include <arpa/inet.h># include <netdb.h># include <stdio.h># include <signal.h># include <unistd.h>  

int main() {  int sd;  struct sockaddr_in sin;  char buf[1024];  int n;    if((sd=socket(AF_INET,SOCK_STREAM,0))==-1)  {  perror("can&#39;t creat socket!");  exit(1);   }   printf("creat socket!");    sin.sin_family=AF_INET;  sin.sin_addr.s_addr=htonl("192.168.135.99");  sin.sin_port=htons(1989);    if(connect(sd,(void*)&sin,sizeof(sin))==-1)  {  perror("can&#39;t connect!");  exit(1);   }  printf("connect socket!");  printf("input a message:\n");  fgets(buf,sizeof(buf),stdin);    if((n=send(sd,buf,sizeof(buf),0))==-1)  {  perror("can&#39;t send message!");  exit(1);   }    if((n=recv(sd,buf,sizeof(buf),0))==-1)  {  perror("receive error!");  exit(1);   }  printf("response from server:%s",buf);  close(sd); }  when I run it under uclinux, the printf can&#39;t work because I can&#39;t get any message in the sdk. Can anyone help me ? Thank you.

[Altera_Forum]

You can NOT use SDK/HAL API for uClinux. 

Search this forum, and you may find some socket prog examples.

[Altera_Forum]

by the way 

sin.sin_addr.s_addr=htonl("192.168.135.99");  cannot work.  replace it:  sin.sin_addr.s_addr=inet_addr("192.168.135.99");  there are tons of examples in the internet....

[Altera_Forum]

thank you for all your help. 

now the printf can run,but my server program and client program can&#39;t run normally.it says:can&#39;t connect!:connection refused! my server.c and client.c are like below.  client.c:# include <sys/types.h># include <sys/socket.h># include <sys/ioctl.h># include <sys/time.h># include <netinet/in.h># include <arpa/inet.h># include <netdb.h># include <stdio.h># include <signal.h># include <unistd.h>   int main() {  int sd;  struct sockaddr_in sin;  char buf[1024];  int n;    if((sd=socket(AF_INET,SOCK_STREAM,0))==-1)  {  perror("can&#39;t creat socket!");  exit(1);   }   sin.sin_family=AF_INET;  sin.sin_addr.s_addr=inet_addr("192.168.135.99");//the server ip  sin.sin_port=htons(7777);    if(connect(sd,(void*)&sin,sizeof(sin))==-1)  {  perror("can&#39;t connect!");  exit(1);   }  printf("input a message:\n");  fgets(buf,sizeof(buf),stdin);  if((n=send(sd,buf,sizeof(buf),0))==-1)  {  perror("can&#39;t send message!");  exit(1);   }    if((n=recv(sd,buf,sizeof(buf),0))==-1)  {  perror("receive error!");  exit(1);   }  printf("response from server:%s",buf);  close(sd); }  ***************************************************** the server.c :# include <sys/types.h># include <sys/socket.h># include <sys/ioctl.h># include <sys/time.h># include <netinet/in.h># include <arpa/inet.h># include <netdb.h># include <stdio.h># include <signal.h># include <unistd.h>  # define max 1024  int main () {  int sd,cd;  int slen,clen;  struct sockaddr_in sin,cin;  char buf[max];  int i,n;   if((sd=socket(AF_INET,SOCK_STREAM,0))==-1)  {  perror("can&#39;t creat socket!");  exit(1);  }   sin.sin_family=AF_INET;  sin.sin_addr.s_addr=inet_addr(INADDR_ANY);  sin.sin_port=htons(7777);  slen=sizeof(sin);  clen=sizeof(cin);    if(bind(sd,(struct sockaddr*)&sin,slen)==-1)  {  perror("bind error!");   exit(1);  }   if(listen(sd,20)==-1)  {  perror("listen error!");  exit(1);  }  printf("waiting for connections from clients!\n");       if((cd=accept(sd,(struct sockaddr*)&cin,&clen))==-1)  {  perror("accept error!");  exit(1);    }     if((n=recv(cd,buf,sizeof(buf),0))<0)  {  perror("receive error!");  exit(1);   }    printf("received from the client:IP:%d port:%d %s\n",  ntohl(cin.sin_addr.s_addr),ntohs(cin.sin_port),buf);    for(i=0;i<=n;i++) buf=toupper(buf);    if((n=send(cd,buf,n,0))<0)  {  perror("send error!");  exit(1);    }  close(cd); } ******************************************************** Is there any wrong? thank you.

[Altera_Forum]

in replace in your server code 

sin.sin_addr.s_addr=inet_addr(INADDR_ANY);  with  sin.sin_addr.s_addr=INADDR_ANY;