Unix Programming - Re: recv() - How do you know the length of buffer that you are going

Author

Re: recv() - How do you know the length of buffer that you are going

Nils O. Selåsdal

2005-12-19, 7:49 am

Steven wrote:
> So sizeof() should be used in the 3rd param of send() too?
It is how much data you want to receive. You have to decide. Often
based on an application protocol.

char buf[512];
recv(fd,buf,sizeof buf); /*sizeof, sure why not */
ofcourse you check the return value of recv to know
how much you actually received.

or how about

....
if((sofar+ chunksize*2) > (sofar+chunksize+1)/chunksize)*chunksize)
buf = realloc(buf,sofar+chunksize); /*leak if we fail*/
ret = recv(fd,buf+sofar,chunksize);
if(ret > 0)
sofar += ret;

So, not just sizeof