Small example program shut down urtwn

[Otacílio]

Dears

I wrote these two small programs to help debug a problem that I think I 
have found when using urtwn driver in a baglebone black. The problem is 
100% reproducible.

In a server machine I run:

serverUDP 2508

In beaglebone black I run:

./clientUDP servername 2508 9216 0

All the times, after some packages be sent the urtwn interface do not 
respond from ping and stops send others packages. Some times this error 
message appears:

% urtwn0: device timeout

I have tested with RTL8192CU and RTL8188CUS

The problem do no occurs in my notebook.

Following the server and client

#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>

#define BUFFER_LEN    1024*1024

void diep(char *s)
{
     perror(s);
     exit(1);
}

int main(int argc, char **argv)
{
     int lidos;
     struct sockaddr_in si_me, si_other;
     int s, i, slen=sizeof(si_other);
     char buf[BUFFER_LEN];
     int aux;

     if(argc != 2){
         fprintf(stderr, "Voce deve usar %s <porta>\n", argv[0]);
         exit(1);
     }

     if ((s=socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP))==-1)
         diep("socket");

     memset((char *) &si_me, 0, sizeof(si_me));
     si_me.sin_family = AF_INET;
     si_me.sin_port = htons(strtol(argv[1], (char **)NULL, 10));
         si_me.sin_addr.s_addr = htonl(INADDR_ANY);
         if (bind(s, (struct sockaddr *)&si_me, sizeof(si_me))==-1)
             diep("bind");

     i = 1;
         do {
         if ((lidos = recvfrom(s, buf, BUFFER_LEN, 0, (struct sockaddr 
*)&si_other, (socklen_t *)&slen))==-1)
             diep("recvfrom()");
         aux = ntohl(*(int*)&buf[0]);
         printf("Perdidos %d pacotes (%0.2f%%)\n", aux - i, 
100*((float)(aux - i))/((float)aux));
         printf("Sequencia %0000d Recebidos %d bytes\n", aux, lidos);
         i++;
     }while(lidos>0);

     close(s);
     return 0;
}

#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <sys/select.h>

#define SOCKET_ERROR    -1
#define INVALID_SOCKET    -1

#define SRV_IP "127.0.0.1"

void diep(char *s)
{
         perror(s);
     exit(1);
}


int main(int argc, char **argv)
{
     struct sockaddr_in si_other;
     int s, i, slen=sizeof(si_other);
     char *buf;
     int tamanho;
     int npack;
     struct addrinfo *result = NULL,
                     *ptr = NULL,
                     hints;
     int iResult, aux;
     fd_set fdset;

     if(argc != 5){
         fprintf(stderr,"Voce deve usar %s <host> <porta> <tamanho> 
<numero de pacotes>\n", argv[0]);
         exit(1);
     }

     tamanho        = (int)strtol(argv[3], (char **)NULL, 10);
     npack        = (int)strtol(argv[4], (char **)NULL, 10);

     buf = malloc(tamanho);

     bzero(&hints, sizeof(hints));
     hints.ai_family = AF_UNSPEC;
     hints.ai_socktype = SOCK_DGRAM;
     hints.ai_protocol = IPPROTO_UDP;

     iResult = getaddrinfo(argv[1], argv[2], &hints, &result);
     if ( iResult != 0 ) {
             printf("getaddrinfo failed with error: %d\n", iResult);
         return 1;
     }

     // Attempt to connect to an address until one succeeds
     for(ptr=result; ptr != NULL ;ptr=ptr->ai_next) {

         // Create a SOCKET for connecting to server
         s = socket(ptr->ai_family, ptr->ai_socktype, ptr->ai_protocol);
         if (s < 0){
             perror("socket");
             return 1;
            }

            // Connect to server.
            iResult = connect(s, ptr->ai_addr, (int)ptr->ai_addrlen);
            if (iResult == SOCKET_ERROR) {
             close(s);
             s = INVALID_SOCKET;
                continue;
            }

            break;
     }

     freeaddrinfo(result);
     FD_ZERO(&fdset);
     FD_SET(s, &fdset);
     for (i=1; i<=npack || npack==0; i++) {
         aux = htonl(i);
         memcpy(&buf[0], &aux, sizeof(aux));
         aux = htonl(npack);
         memcpy(&buf[0+sizeof(i)], &aux, sizeof(aux));
         do{
             if(select(s+1, NULL, &fdset, NULL, NULL )<0)
                 diep("select()");
         }while(!FD_ISSET(s, &fdset));
         if (send(s, buf, tamanho, 0)==-1)
             diep("sendto()");
     }
     printf("Enviados %d pacotes de %d bytes\n", npack, tamanho);

     close(s);
     return 0;
}