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1.1 root 1: .TH BIND 1
2: .SH NAME
3: bind, mount, unmount \- change name space
4: .SH SYNOPSIS
5: .B bind
6: [
7: .I option ...
8: ]
9: .I new old
10: .PP
11: .B mount
12: [
13: .I option ...
14: ]
15: .I servename old
16: [
17: .I spec
18: ]
19: .PP
20: .B unmount
21: [
22: .I new
23: ]
24: .I old
25: .SH DESCRIPTION
26: .I Bind
27: and
28: .I mount
29: modify the file name space of the current process
30: and other processes in the same name space group
31: (see
32: .IR fork (2)).
33: For both calls,
34: .I old
35: is the name of an existing file or directory in the
36: current name space where the modification is to be made.
37: .PP
38: For
39: .IR bind ,
40: .I new
41: is the name of another (or possibly the same)
42: existing file or directory in
43: the current name space.
44: After a successful
45: .IR bind ,
46: the file name
47: .I old
48: is an alias for the object originally named by
49: .IR new ;
50: if the modification doesn't hide it,
51: .I new
52: will also still refer to its original file.
53: The evaluation of
54: .I new
55: (see
56: .IR intro (2))
57: happens at the time of the
58: .IR bind ,
59: not when the binding is later used.
60: .PP
61: The
62: .I servename
63: argument to
64: .I mount
65: is the name of a file that, when opened, yields an
66: existing connection to a file server.
67: Almost always,
68: .I servename
69: will be a file in
70: .B /srv
71: (see
72: .IR srv (3)).
73: In the discussion below,
74: .I new
75: refers to the file named by the
76: .I new
77: argument to
78: .I bind
79: or the root directory of the service
80: available in
81: .I servename
82: after a
83: .I mount.
84: Either both
85: .I old
86: and
87: .I new
88: files must be directories,
89: or both must not be directories.
90: .PP
91: Options control aspects of the modification to the name space:
92: .TP 10
93: (none)
94: Replace the
95: .I old
96: file by the new one.
97: Henceforth, an evaluation of
98: .I old
99: will be translated to the new file.
100: If they are directories (for
101: .IR mount ,
102: this condition is true by definition),
103: .I old
104: becomes a
105: .I "union directory"
106: consisting of one directory (the new file).
107: .TP
108: .B -b
109: Both files must be directories.
110: Add the new directory to the beginning
111: of the union directory represented by the old file.
112: .TP
113: .B -a
114: Both files must be directories.
115: Add the new directory to the end
116: of the union directory represented by the old file.
117: .TP
118: .B -c
119: This can be used in addition to any of the above to permit
120: creation in a union directory.
121: When a new file is created in a union directory,
122: it is placed in the first element of the union that permits creation.
123: .PD
124: .PP
125: The
126: .I spec
127: argument to
128: .I mount
129: is passed in the
130: .IR attach (5)
131: message to the server, and selects among different
132: file trees served by the server.
133: .PP
134: The
135: .IR srv (3)
136: service registry device, normally bound to
137: .BR /srv ,
138: is a convenient rendezvous point for services that can be mounted.
139: After bootstrap, the file
140: .B /srv/boot
141: contains the communications port to the file system from which
142: the system was loaded.
143: .PP
144: The effects of
145: .I bind
146: and
147: .I mount
148: can be undone with the
149: .I unmount
150: command.
151: If two arguments are given to
152: .IR unmount ,
153: the effect is to undo a
154: .I bind
155: or
156: .I mount
157: with the same arguments.
158: If only one argument is given,
159: everything bound to or mounted upon
160: .I old
161: is unmounted.
162: .SH EXAMPLES
163: To compile a program with the C library from July 16, 1992:
164: .IP
165: .EX
166: mount /srv/boot /n/dump dump
167: bind /n/dump/1992/0716/mips/lib/libc.a /mips/lib/libc.a
168: mk
169: .EE
170: .SH SOURCE
171: .B /sys/src/cmd/bind.c
172: .br
173: .B /sys/src/cmd/mount.c
174: .br
175: .B /sys/src/cmd/unmount.c
176: .SH SEE ALSO
177: .IR bind (2),
178: .IR open (2),
179: .IR srv (3),
180: .IR srv (4)
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