hello again to you all...
i'm trying to broadcast through a LAN using the socket interface provided by FLIPS with a small test program, here is the code:
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#include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <string.h> #include <netdb.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h>
#include <l4/log/l4log.h>
#define PORTNUMBER 5824
/*Sets the socket to non-blocking*/
void unblock_socket(int sd); void unblock_socket(int sd) { int flags;
/* get current socket flags */ if ((flags=fcntl(sd, F_GETFL)) == -1) { LOG("GETFL"); exit(1); }
/* set socket to non-blocking */ flags |= O_NDELAY; if (fcntl(sd, F_SETFL, flags) == -1) { LOG("SETFL"); exit(1); } }
int main (int argc, char** argv) { int socketDesc; /* Socket Descriptor */ int addrLength; int i; struct sockaddr_in destinationAddr, myAddr, responseAddr; struct hostent *hostNameBufPtr; char outMessageBuf[128]; char inMessageBuf[128]; int trueFlag = 0x1; int size_sent = 0; int recvfrom_error;
/* Create socket from which to send */ if ((socketDesc = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { LOG("open error on socket"); exit(1); }
/* BIND the socket on our end to any available port (i.e. leave it up to the system to assign a port (used for replys */ myAddr.sin_family = AF_INET; myAddr.sin_addr.s_addr = htonl(INADDR_ANY); myAddr.sin_port = htons(PORTNUMBER); /* The zero says bind to any port */
if (bind(socketDesc, (struct sockaddr *) &myAddr, sizeof(myAddr)) < 0) { perror("bind error"); exit(1); }
/* And build BROADCAST address */ destinationAddr.sin_family = AF_INET; destinationAddr.sin_addr.s_addr = htonl(INADDR_BROADCAST); destinationAddr.sin_port = htons(PORTNUMBER);
/* Set the socket to permit multicasts on the local LAN */ if (setsockopt(socketDesc, SOL_SOCKET, SO_BROADCAST, &trueFlag, sizeof(trueFlag)) != 0) { LOG("setsockopt error"); exit(1); }
//COMMENTED //unblock_socket(socketDesc);
for(i=0; i<2; i++){ /* Broadcast message */ sprintf(outMessageBuf,"%d", i); if ((size_sent = sendto(socketDesc, outMessageBuf, strlen(outMessageBuf)+1, 0, (struct sockaddr *)&destinationAddr, sizeof(destinationAddr))) < 0) { LOG("socket send error"); exit(1); } } LOG("size sent: %d\n", size_sent);
return 0; }
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i've tried out the mini_http example with mini_ifconfig and works out fine with this menu.lst:
title Testes root (hd0,0) kernel /home/tiago/fiasco_builddir/rmgr -sigma0 modaddr 0x02000000 module /home/tiago/fiasco_builddir/main -nokdb -nowait -serial_esc -comspeed 115200 -comport 1 module /home/tiago/fiasco_builddir/sigma0 module /home/tiago/fiasco_builddir/names module /home/tiago/fiasco_builddir/dm_phys module /home/tiago/fiasco_builddir/l4io module /home/tiago/fiasco_builddir/name_server module /home/tiago/fiasco_builddir/flips-lxdrv module /home/tiago/fiasco_builddir/mini_ifconfig eth0 10.10.5.197 255.255.0.0 module /home/tiago/fiasco_builddir/mini_http
but when i add my program, replacing mini_http, built with the same libs and configs as mini_http, gives me an error when sends the packet.
LOG("socket send error");
am i doing this right? does flips support broadcast UDP? i've hacked mini_ifconfig and i see that the eth0 flags are ok for broadcasting... what am i doing wrong?
thanks in advance
Tiago