Hi, 

I built small test server application using lwip stack  to work like echo server . 

i tried to associate the socket with a stream by using fdopen but it failed . 

when i using the mode "r" or "r+" it give invalid parameter error,

in the same time when i try to write on the file descriptor returned by lwip_accept  it is write to the client . 

the part of code is : 

while (1)

{

magsock = lwip_accept (socket_v , 0, 0 );

if (magsock ==-1)

    {

         perror ("lwip_accept");

    }

else 

    {

        // this is work 

        char *buf= "hi"; 

        if(  write (,magsock,buf , sizeof(buf) )<0)

           {

                perror ("write");

            }

        // this is not work 

        FILE *file; 

        file= fdopn(magsock ,"r");

        if (file==NULL)

           {

                perror ("fdopn");   

                

           }

        int c ; 

        while(c=fgetc(file))

               printf(c);

        fclose(file);

    }

} 

any clue or suggestion ? 

best,