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1.1 root 1: .TH MOUNT 2 "27 July 1983"
2: .UC 4
3: .SH NAME
4: mount, umount \- mount or remove file system
5: .SH SYNOPSIS
6: .nf
7: .ft B
8: mount(special, name, rwflag)
9: char *special, *name;
10: int rwflag;
11: .PP
12: .ft B
13: umount(special)
14: char *special;
15: .fi
16: .SH DESCRIPTION
17: .I Mount
18: announces to the system that a removable file system has
19: been mounted on
20: the block-structured special file
21: .I special;
22: from now on, references to file
23: .I name
1.1.1.2 ! root 24: refers to
1.1 root 25: the root file on the newly mounted file system.
26: .I Special
27: and
28: .I name
29: are pointers to null-terminated strings
30: containing the appropriate path names.
31: .PP
32: .I Name
33: must exist already.
34: .I Name
35: must be a directory.
36: Its old contents
37: are inaccessible while the file system
38: is mounted.
39: .PP
40: The
41: .I rwflag
42: argument determines whether
43: the file system can be written on; if it is 0 writing
44: is allowed, if non-zero no writing is done.
45: Physically write-protected and magnetic
46: tape file systems must be mounted read-only or
1.1.1.2 ! root 47: errors occur when access times are updated,
1.1 root 48: whether or not any
49: explicit write or file removal is attempted.
50: Setting the write-protected button alone is not
51: sufficient to notify the system of the intent.
52: .PP
53: .I Umount
54: announces to the system that the
55: .I special
56: file is no longer to contain a removable file system.
57: The associated file reverts to its ordinary interpretation.
58: .SH "RETURN VALUE
59: .I Mount
60: returns 0 if the action occurred, \-1 if
61: .I special
62: is inaccessible or not an appropriate file, if
63: .I name
64: does not exist, if
65: .I special
66: is already mounted, if
67: .I name
68: is in use, or if
69: there are already too many
70: file systems mounted.
71: .PP
72: .I Umount
73: returns 0 if the action occurred; \-1 if
1.1.1.2 ! root 74: the special file is inaccessible or,
1.1 root 75: does not have a mounted file system,
76: or if there are active files in the mounted
77: file system.
78: .SH ERRORS
79: .I Mount
1.1.1.2 ! root 80: fails when one of the following occurs:
1.1 root 81: .TP 15
82: [NODEV]
83: The caller is not the super-user.
84: .TP 15
85: [NODEV]
86: .I Special
87: does not exist.
88: .TP 15
89: [ENOTBLK]
90: .I Special
91: is not a block device.
92: .TP 15
93: [ENXIO]
94: The major device number of
95: .I special
96: is out of range (this indicates no device driver exists
97: for the associated hardware).
98: .TP 15
99: [EPERM]
100: The pathname contains a character with the high-order bit set.
101: .TP 15
102: [ENOTDIR]
103: A component of the path prefix in
104: .I name
105: is not a directory.
106: .TP 15
107: [EROFS]
108: .I Name
109: resides on a read-only file system.
110: .TP 15
111: [EBUSY]
112: .I Name
113: is not a directory, or another process currently
114: holds a reference to it.
115: .TP 15
116: [EBUSY]
117: No space remains in the mount table.
118: .TP 15
119: [EBUSY]
120: The super block for the file system had a bad magic
121: number or an out of range block size.
122: .TP 15
123: [EBUSY]
124: Not enough memory was available to read the cylinder
125: group information for the file system.
126: .TP 15
127: [EBUSY]
128: An i/o error occurred while reading the super block or
129: cylinder group information.
130: .PP
131: .I Umount
132: may fail with one of the following errors:
133: .TP 15
134: [NODEV]
135: The caller is not the super-user.
136: .TP 15
137: [NODEV]
138: .I Special
139: does not exist.
140: .TP 15
141: [ENOTBLK]
142: .I Special
143: is not a block device.
144: .TP 15
145: [ENXIO]
146: The major device number of
147: .I special
148: is out of range (this indicates no device driver exists
149: for the associated hardware).
150: .TP 15
151: [EINVAL]
152: The requested device is not in the mount table.
153: .TP 15
154: [EBUSY]
155: A process is holding a reference to a file located
156: on the file system.
157: .SH "SEE ALSO"
158: mount(8), umount(8)
159: .SH BUGS
160: The error codes are in a state of disarray; too many errors
161: appear to the caller as one value.
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