<div>
setsockopt(sck, SOL_SOCKET, SO_BROADCAST, 1)<br />
<br />
perror on this function returns Bad Address<br />
<br />

</div>


setsockopt(sck, SOL_SOCKET, SO_BROADCAST, 1)

perror on this function returns Bad Address



<div>
Sorry, I believe you have to bind the socket for this to work:<br />
<br />
&nbsp;if( bind (sck, (void *)&amp;dest_addr, sizeof(dest_addr)) == -1)<br />
&nbsp; &nbsp; perror( &quot;bind&quot; );<br />
<br />
Then do the setsockopt line.<br />
<br />

</div>


Sorry, I believe you have to bind the socket for this to work:

 if( bind (sck, (void *)&dest_addr, sizeof(dest_addr)) == -1)
    perror( "bind" );

Then do the setsockopt line.



<div>
Sorry, but that didn't help. &nbsp;<br />
<br />
Still get the same error Bad Address.
</div>


Sorry, but that didn't help.  

Still get the same error Bad Address.

<div>
Actually it works by setting an int variable to 1 and passing its pointer in the function instead of 1.<br />
<br />
Thanks<br />
jw
</div>


Actually it works by setting an int variable to 1 and passing its pointer in the function instead of 1.

Thanks
jw

<div>
<div class="content wysiwyg-content">
I am trying to broadcast a simple datagram packet over the network using the sendto() function on a linux box.<br />
<br />
&nbsp; &nbsp; &nbsp; &nbsp; int sckt;<br />
&nbsp; &nbsp; &nbsp;struct sockaddr_in dest_addr;<br />
&nbsp; &nbsp; &nbsp;sckt=socket(AF_INET,SOCK_D<wbr />GRAM,0);<br />
&nbsp; &nbsp; &nbsp;dest_addr.sin_family=AF_IN<wbr />ET;<br />
&nbsp; &nbsp; &nbsp;dest_addr.sin_port=htons(5<wbr />051);<br />
&nbsp; &nbsp; &nbsp;inet_aton(&quot;192.168.1.255&quot;,<wbr />&amp;dest_addr<wbr />.sin_addr.<wbr />s_addr);<br />
&nbsp; &nbsp; &nbsp;memset (&amp;(dest_addr.sin_zero),'\0<wbr />',8);<br />
&nbsp; &nbsp; &nbsp; &nbsp; if (sendto (sckt,&quot;test&quot;,4,0,&amp;dest_add<wbr />r,sizeof(s<wbr />truct sockaddr_in))==-1)<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; perror (&quot;sendto&quot;);<br />
<br />
<br />
perror returns Permission Denied<br />
<br />
The above code works if I send it to just one address, but not with a broadcast address. <br />
<br />
How can I do a broadcast<br />
<br />
Thanks<br />
jw
</div>
</div>


I am trying to broadcast a simple datagram packet over the network using the sendto() function on a linux box.

        int sckt;
     struct sockaddr_in dest_addr;
     sckt=socket(AF_INET,SOCK_DGRAM,0);
     dest_addr.sin_family=AF_INET;
     dest_addr.sin_port=htons(5051);
     inet_aton("192.168.1.255",&dest_addr.sin_addr.s_addr);
     memset (&(dest_addr.sin_zero),'\0',8);
        if (sendto (sckt,"test",4,0,&dest_addr,sizeof(struct sockaddr_in))==-1)
          perror ("sendto");


perror returns Permission Denied

The above code works if I send it to just one address, but not with a broadcast address. 

How can I do a broadcast

Thanks
jw

sendto() broadcast datagram packet

C is a general-purpose, imperative computer programming language, supporting structured programming, lexical variable scope and recursion, while a static type system prevents many unintended operations. By design, C provides constructs that map efficiently to typical machine instructions, so it has found lasting use in applications that had formerly been coded in assembly language, including operating systems as well as various application software for computers ranging from supercomputers to embedded systems. It is distinct from C++ (which has its roots in C) and C#, and many later languages have borrowed directly or indirectly from C.