76 lines
1.5 KiB
Groff
76 lines
1.5 KiB
Groff
.TH MOUNT 2
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.UC 4
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.SH NAME
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mount, umount \- mount and unmount filesystems.
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.SH SYNOPSIS
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.nf
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.B #incldue <unistd.h>
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.B int mount (const char *devname, const char *dirname, int rw_flag);
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.B int umount (const char *devname);
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.fi
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.SH DESCRIPTION
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.B mount()
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mounts the filesystem on the block device named
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.I *devname
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onto the directory
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.I dirname
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.PP
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.B umount()
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unmounts the specified block device.
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.PP
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0 is returned on success, a negative value on error.
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.SH ERRORS
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.B -EBUSY
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is returned under the following conditions:
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.br
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.IP 1.
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There is activity in the directory you are trying to mount on
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.IP 2.
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You are attempting to mount on /.
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.IP 3.
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There is file system activity during umount, which could be as simple as a
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process having a directory under the mount point as wd.
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.PP
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.B -ENOENT
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is returned if the block device or directory does not exist.
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.PP
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.B -ENOTBLK
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is returned if you attempt to unmount a non-block device.
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.PP
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.B -EPERM
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is returned under the following conditions:
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.br
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.IP 1.
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You attempt to mount a non-block device.
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.IP 2.
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You attempt to mount on a non-directory.
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.IP 3.
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The filesystem is already mounted.
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.SH FILES
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linux/fs/super.c
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.br
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/usr/include/linux/sys.h
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.br
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/usr/include/unistd.h
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.SH BUGS
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.I rw_flag
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is ignored.
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.PP
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non-super users may make
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.B mount()
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and
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.B umount()
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calls.
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.PP
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It is impossible to mount over root, as with BSD.
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This can be considered a feature or misfeature
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depending on you you look at it -
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as root will always be busy and probably shouldn't be mounted
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over.
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.PP
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.B EBUSY, ENOTBLK,
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and
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.B EPERM
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may be confused in some places.
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