| 1 | .\" Copyright (c) 1980 Regents of the University of California. |
| 2 | .\" All rights reserved. The Berkeley software License Agreement |
| 3 | .\" specifies the terms and conditions for redistribution. |
| 4 | .\" |
| 5 | .\" @(#)mount.2 6.1 (Berkeley) %G% |
| 6 | .\" |
| 7 | .TH MOUNT 2 "" |
| 8 | .UC 4 |
| 9 | .SH NAME |
| 10 | mount, umount \- mount or remove file system |
| 11 | .SH SYNOPSIS |
| 12 | .nf |
| 13 | .ft B |
| 14 | mount(special, name, rwflag) |
| 15 | char *special, *name; |
| 16 | int rwflag; |
| 17 | .PP |
| 18 | .ft B |
| 19 | umount(special) |
| 20 | char *special; |
| 21 | .fi |
| 22 | .SH DESCRIPTION |
| 23 | .I Mount |
| 24 | announces to the system that a removable file system has |
| 25 | been mounted on |
| 26 | the block-structured special file |
| 27 | .I special; |
| 28 | from now on, references to file |
| 29 | .I name |
| 30 | will refer to |
| 31 | the root file on the newly mounted file system. |
| 32 | .I Special |
| 33 | and |
| 34 | .I name |
| 35 | are pointers to null-terminated strings |
| 36 | containing the appropriate path names. |
| 37 | .PP |
| 38 | .I Name |
| 39 | must exist already. |
| 40 | .I Name |
| 41 | must be a directory. |
| 42 | Its old contents |
| 43 | are inaccessible while the file system |
| 44 | is mounted. |
| 45 | .PP |
| 46 | The |
| 47 | .I rwflag |
| 48 | argument determines whether |
| 49 | the file system can be written on; if it is 0 writing |
| 50 | is allowed, if non-zero no writing is done. |
| 51 | Physically write-protected and magnetic |
| 52 | tape file systems must be mounted read-only or |
| 53 | errors will occur when access times are updated, |
| 54 | whether or not any |
| 55 | explicit write is attempted. |
| 56 | .PP |
| 57 | .I Umount |
| 58 | announces to the system that the |
| 59 | .I special |
| 60 | file is no longer to contain a removable file system. |
| 61 | The associated file reverts to its ordinary interpretation. |
| 62 | .SH "RETURN VALUE |
| 63 | .I Mount |
| 64 | returns 0 if the action occurred, \-1 if |
| 65 | .I special |
| 66 | is inaccessible or not an appropriate file, if |
| 67 | .I name |
| 68 | does not exist, if |
| 69 | .I special |
| 70 | is already mounted, if |
| 71 | .I name |
| 72 | is in use, or if |
| 73 | there are already too many |
| 74 | file systems mounted. |
| 75 | .PP |
| 76 | .I Umount |
| 77 | returns 0 if the action occurred; \-1 if |
| 78 | if the special file is inaccessible or |
| 79 | does not have a mounted file system, |
| 80 | or if there are active files in the mounted |
| 81 | file system. |
| 82 | .SH ERRORS |
| 83 | .I Mount |
| 84 | will fail when one of the following occurs: |
| 85 | .TP 15 |
| 86 | [NODEV] |
| 87 | The caller is not the super-user. |
| 88 | .TP 15 |
| 89 | [NODEV] |
| 90 | .I Special |
| 91 | does not exist. |
| 92 | .TP 15 |
| 93 | [ENOTBLK] |
| 94 | .I Special |
| 95 | is not a block device. |
| 96 | .TP 15 |
| 97 | [ENXIO] |
| 98 | The major device number of |
| 99 | .I special |
| 100 | is out of range (this indicates no device driver exists |
| 101 | for the associated hardware). |
| 102 | .TP 15 |
| 103 | [EPERM] |
| 104 | The pathname contains a character with the high-order bit set. |
| 105 | .TP 15 |
| 106 | [ENOTDIR] |
| 107 | A component of the path prefix in |
| 108 | .I name |
| 109 | is not a directory. |
| 110 | .TP 15 |
| 111 | [EROFS] |
| 112 | .I Name |
| 113 | resides on a read-only file system. |
| 114 | .TP 15 |
| 115 | [EBUSY] |
| 116 | .I Name |
| 117 | is not a directory, or another process currently |
| 118 | holds a reference to it. |
| 119 | .TP 15 |
| 120 | [EBUSY] |
| 121 | No space remains in the mount table. |
| 122 | .TP 15 |
| 123 | [EBUSY] |
| 124 | The super block for the file system had a bad magic |
| 125 | number or an out of range block size. |
| 126 | .TP 15 |
| 127 | [EBUSY] |
| 128 | Not enough memory was available to read the cylinder |
| 129 | group information for the file system. |
| 130 | .TP 15 |
| 131 | [EBUSY] |
| 132 | An i/o error occurred while reading the super block or |
| 133 | cylinder group information. |
| 134 | .PP |
| 135 | .I Umount |
| 136 | may fail with one of the following errors: |
| 137 | .TP 15 |
| 138 | [NODEV] |
| 139 | The caller is not the super-user. |
| 140 | .TP 15 |
| 141 | [NODEV] |
| 142 | .I Special |
| 143 | does not exist. |
| 144 | .TP 15 |
| 145 | [ENOTBLK] |
| 146 | .I Special |
| 147 | is not a block device. |
| 148 | .TP 15 |
| 149 | [ENXIO] |
| 150 | The major device number of |
| 151 | .I special |
| 152 | is out of range (this indicates no device driver exists |
| 153 | for the associated hardware). |
| 154 | .TP 15 |
| 155 | [EINVAL] |
| 156 | The requested device is not in the mount table. |
| 157 | .TP 15 |
| 158 | [EBUSY] |
| 159 | A process is holding a reference to a file located |
| 160 | on the file system. |
| 161 | .SH "SEE ALSO" |
| 162 | mount(8), umount(8) |
| 163 | .SH BUGS |
| 164 | The error codes are in a state of disarray; too many errors |
| 165 | appear to the caller as one value. |