printf's problem under uclinux

You can NOT use SDK/HAL API for uClinux.

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

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....

thank you for all your help.

now the printf can run,but my server program and client program can't run normally.it says:can'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.

in replace in your server code

 sin.sin_addr.s_addr=inet_addr(INADDR_ANY);

with

 sin.sin_addr.s_addr=INADDR_ANY;