TCP/IP 4.1 Specifics

• sock_init() no longer needed. It is still provided as a null call.
  
• Socket limit raised from 2048 to 32,768.
  
• SOMAXCONN now at 1024. Important for services like HTTP which sustain many short connections.
  
• Heavily loaded 16 bit code not stable on the 32 bit stack.
  
• BSD select() is now just select(), while the OS/2 version of select is now os2_select()
  
• h_errno is now a variable instead of a function. You may still call it as a function, it is mapped.
  
• bswap(), lswap, and tcp_h_errno() are gone
  
• Changes made to the options in getsockopt() and setsockopt()
  
• Added sysctl()
  
• You must define TCPV40HDRS in order to compile to the version 4.0 (16 bit) stack
  
• Must link tcpip32.dll
  
• Misc changes in include files. See socket.hpp for examples