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Plan 9 - man page for bind (plan9 section 1)

BIND(1) 			     General Commands Manual				  BIND(1)

NAME
       bind, mount, unmount - change name space

SYNOPSIS
       bind [ option ...  ] new old

       mount [ option ...  ] servename old [ spec ]

       unmount [ new ] old

DESCRIPTION
       Bind  and  mount  modify the file name space of the current process and other processes in
       the same name space group (see fork(2)).  For both calls, old is the name of  an  existing
       file or directory in the current name space where the modification is to be made.

       For  bind, new is the name of another (or possibly the same) existing file or directory in
       the current name space.	After a successful bind, the file name old is an  alias  for  the
       object  originally  named by new; if the modification doesn't hide it, new will also still
       refer to its original file.  The evaluation of new (see intro(2)) happens at the  time  of
       the bind, not when the binding is later used.

       The  servename argument to mount is the name of a file that, when opened, yields an exist-
       ing connection to a file server.  Almost always, servename will be a  file  in  /srv  (see
       srv(3)).   In  the  discussion  below, new refers to the file named by the new argument to
       bind or the root directory of the service available in servename after  a  mount.   Either
       both old and new files must be directories, or both must not be directories.

       Options control aspects of the modification to the name space:

       (none)	 Replace  the  old file by the new one.  Henceforth, an evaluation of old will be
		 translated to the new file.  If they are directories (for mount, this	condition
		 is  true  by definition), old becomes a union directory consisting of one direc-
		 tory (the new file).

       -b	 Both files must be directories.  Add the new directory to the beginning  of  the
		 union directory represented by the old file.

       -a	 Both  files  must be directories.  Add the new directory to the end of the union
		 directory represented by the old file.

       -c	 This can be used in addition to any of the above to permit creation in  a  union
		 directory.  When a new file is created in a union directory, it is placed in the
		 first element of the union that permits creation.

       The spec argument to mount is passed in the attach(5) message to the server,  and  selects
       among different file trees served by the server.

       The  srv(3)  service  registry  device, normally bound to /srv, is a convenient rendezvous
       point for services that can be mounted.	After bootstrap, the file /srv/boot contains  the
       communications port to the file system from which the system was loaded.

       The  effects  of  bind and mount can be undone with the unmount command.  If two arguments
       are given to unmount, the effect is to undo a bind or mount with the same  arguments.   If
       only one argument is given, everything bound to or mounted upon old is unmounted.

EXAMPLES
       To compile a program with the C library from July 16, 1992:

	      mount /srv/boot /n/dump dump
	      bind /n/dump/1992/0716/mips/lib/libc.a /mips/lib/libc.a
	      mk

SOURCE
       /sys/src/cmd/bind.c
       /sys/src/cmd/mount.c
       /sys/src/cmd/unmount.c

SEE ALSO
       bind(2), open(2), srv(3), srv(4)

											  BIND(1)


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