90 lines
1.6 KiB
Text
90 lines
1.6 KiB
Text
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.TH RAMFS 4
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.SH NAME
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ramfs \- memory file system
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.SH SYNOPSIS
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.B ramfs
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[
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.B -Dipsu
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]
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[
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.B -m
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.I mountpoint
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]
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[
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.B -S
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.I srvname
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]
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.SH DESCRIPTION
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.I Ramfs
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starts a process that mounts itself (see
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.IR bind (2))
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on
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.I mountpoint
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(default
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.BR /tmp ).
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The
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.I ramfs
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process implements a file tree rooted at
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.IR dir ,
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keeping all files in memory.
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Initially the file tree is empty.
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.PP
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The
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.B -D
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option enables a trace of general debugging messages.
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.PP
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The
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.B -i
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flag tells
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.I ramfs
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to use file descriptors 0 and 1 for its communication channel
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rather than create a pipe.
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This makes it possible to use
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.I ramfs
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as a file server on a remote machine: the file descriptors 0
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and 1 will be the network channel from
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.I ramfs
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to the client machine.
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.PP
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The
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.B -p
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flag causes
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.I ramfs
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to make its memory `private'
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(see
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.IR proc (3))
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so that its files are not accessible through the debugging interface.
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.PP
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The
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.B -s
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.RB ( -S )
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flag causes
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.I ramfs
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to post its channel on
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.B /srv/ramfs
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.RB ( /srv/ \fIsrvname\fR)
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rather than mounting it on
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.IR mountpoint ,
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enabling multiple clients to access its files.
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However, it does not authenticate its clients and its
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implementation of groups is simplistic, so
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it should not be used for precious data.
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.PP
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The
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.B -u
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option permits
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.I ramfs
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to consume as much memory as needed;
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without it,
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.I ramfs
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will limit its consumption to some arbitrary amount,
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currently 768MB (enough to hold a CD image).
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.PP
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This program is useful mainly as an example of how
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to write a user-level file server.
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It can also be used to provide high-performance temporary files.
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.SH SOURCE
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.B /sys/src/cmd/ramfs.c
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.SH "SEE ALSO"
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.IR bind (2)
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