I am a little bit confused in a socket example through select() Post: 302506848

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LEARN ABOUT MINIX

s_n_d

SET_NET_DEFAULT(8)					      System Manager's Manual						SET_NET_DEFAULT(8)

NAME

       s_n_d, set_net_default - select the default TCP/IP network

SYNOPSIS

       set_net_default: not found

DESCRIPTION

       This  manual page is here because so many others refer to it.  The set_net_default command does not exist under standard Minix, because the
       TCP/IP server only supports one network.  The server under Minix-vmd supports four different networks, that  can  each  be  chosen  as  the
       default network.

       The  TCP/IP library and commands do have a notion about a "default network" however, because the code is shared between the Minix versions.
       So if you want to venture into network programming then you should know about the devices and environment variables mentioned below to make
       your program compatible.  (Especially since there is a plan to upgrade the TCP/IP server for standard Minix.)

   Options and environment to change the default
       Many  TCP/IP  programs implement the following options and environment variables to change the default devices set by set_net_default.  The
       options are only implemented for low level programs where it makes sense to name a network device.  The environment variables are  used	in
       all code.  You can run a process and all its children connected to a different network by setting four environment variables.

       ETH_DEVICE=device
       -E device
	      Device to use as raw ethernet device instead of the default /dev/eth.

       PSIP_DEVICE=device
       -P device
	      Pseudo IP device to use instead of /dev/psip.

       IP_DEVICE=device
       -I device
	      IP device to use instead of /dev/ip.

       TCP_DEVICE=device
       -T device
	      TCP device to use.

       UDP_DEVICE=device
       -U device
	      UDP device to use.

FILES

       /dev/eth[01]	 First and second raw ethernet.

       /dev/psip[01]	 First and second Pseudo IP network.

       /dev/ip[0123]	 IP devices for two ethernets and two Pseudo IP networks.

       /dev/tcp[0123]	 TCP devices for same four networks.

       /dev/udp[0123]	 UDP devices.

       /dev/eth, /dev/psip, /dev/ip, /dev/tcp, /dev/udp
			 Devices  for  the default network, links to the devices above.  Eth is only present if ethernet is the default, psip only
			 for pseudo IP.

SEE ALSO

       ip(4), boot(8).

AUTHOR

       Kees J. Bot (kjb@cs.vu.nl)

																SET_NET_DEFAULT(8)