Read from socket

Question

I need to read from an AF_UNIX socket to a buffer using the function read from C, but I don\'t know the buffer size.

I think the best way is to read

Answer 1

On common way is to use ioctl(..) to query FIONREAD of the socket which will return how much data is available.

int len = 0;
ioctl(sock, FIONREAD, &len);
if (len > 0) {
  len = read(sock, buffer, len);
}