Can read() function on a connected socket return zero bytes?
I know that read() is a blocking call unless I make the socket non-blocking. So I expect read() call which requests 4K of data should return a开发者_如何学运维 positive value ( no of bytes read) or -1 on error ( possible connection reset by client etc). My question is: Can read() return '0' on any occasion?
I am handling the read() this way:
if ((readval = read(acceptfd, buf, sizeof(buf) - 1)) < 0)
{
}
else
{
buf[readval] = 0;
//Do some thing with data
}
This code bombs if read() return zero and I know how to fix it. But is it possible for read() to return zero?
When a TCP connection is closed on one side read() on the other side returns 0 byte.
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