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这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

This package implements Plan 9's IL and 9fs client for FreeBSD 3.2.

> Getting the software

  9pfreebsd.tgz

> Installation

  0. unpack:
	mkdir ~/9pfreebsd
	cd ~/9pfreebsd
	zcat 9pfreebsd.tgz | tar -xf -

     this creates the file freebsd-3.2.il-kernel.patch and the
     directory mount_9fs.

  1. get a fresh copy of the kernel. for example:
	cp -r /usr/src/sys ~/9pfreebsd/freebsd-3.2

  2. apply the patch:
	cd ~/9pfreebsd/freebsd-3.2
	patch -p0 < ../freebsd-3.2.il-kernel.patch

  3. build a new kernel:
	cd ~/9pfreebsd/freebsd-3.2/i386/conf
	config IL
	cd ../../compile/IL; make depend; make

  4. boot the new kernel:
	cp -p /kernel /kernel.good
	cp ~/9pfreebsd/freebsd-3.2/compile/IL/kernel /kernel
	reboot

  5. build mount_9fs:
	cd ~/9pfreebsd; make

> Using IL

  1. connect via IL:

	  if( (s = socket(AF_INET, SOCK_SEQPACKET, IPPROTO_IL)) < 0 ) {
	    perror("socket");    
	    exit(1);
	  }
	
	  bzero(&sin, sizeof(sin));
	  sin.sin_family = AF_INET;
	  sin.sin_addr.s_addr = dest_addr;
	  sin.sin_port = htons(dest_port);
	  if( connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0 ) {
	    perror("connect");
	    exit(1);
	  }

  2. listen via IL:

	  if( (s = socket(AF_INET, SOCK_SEQPACKET, IPPROTO_IL)) < 0 ) {
	    perror("socket");    
	    exit(1);
	  }
	
	  bzero(&sin, sizeof(sin));
	  sin.sin_family = AF_INET;
	  sin.sin_addr.s_addr = INADDR_ANY;
	  sin.sin_port = htons(port_number);
	
	  if( bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0 ) {
	    perror("bind");
	    exit(1);
	  }
	
	  if( listen(s, 5) < 0 ) {
	    perror("listen");
	    exit(1);
	  }
	
	  len = sizeof(sin);
	  if ( (c = accept(s, (struct sockaddr *)& sin, &len)) < 0 ) {
	    perror("accept");
	    exit(1);
	  }
  

> Using 9fs 

  1. limitations:

     The current implementation is mostly tested with a single user on
     the client. No one else can access the mounted file system except
     the authenticator. But two users can mount the same file system
     on the client with different nodes. This is not yet tested much.

  2. mapping plan9 usernames to UNIX uids

     Mount_9fs requires a translation between plan9 usernames and UNIX
     uids. /etc/9uid.conf contains the map. The format is:

		plan9_username	unix_uid

     Not all plan9 users have to have an UNIX account on the
     client. Just give them a unique uid which can be non-existent in
     /etc/passwd.

  3. mounting 9fs:

     To mount by a regular user, the root has to set vfs.usermount to 1
     first (sysctl -w vfs.usermount=1). Then follow the steps below.

     To mount by root:
	
	mount_9fs -u 9user@9auth_server 9fileserver:path node

     This mounts "path" on 9fileserver on local "node" on behalf of
     "9user". Plan9 authentication server "9auth_server" is
     contacted to obtain a ticket.

     mount_9fs will prompt for "9username"'s plan9 password.

     umount works as usual.

     Only the caller of mount_9fs has access to the mounted file system.

  4. WARNING:

     The password is stored in kernel memory and can be read via kmem.

> Bugs and Fixes:

  You are welcome to contact [e-mail] for bug
  reports and fixes.