Initial import of abandoned HQEMU version 2.5.2HEADmaster

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+@example
+@c man begin SYNOPSIS
+usage: qemu-nbd [OPTION]...  @var{filename}
+@c man end
+@end example
+
+@c man begin DESCRIPTION
+
+Export QEMU disk image using NBD protocol.
+
+@c man end
+
+@c man begin OPTIONS
+@table @option
+@item @var{filename}
+ is a disk image filename
+@item -p, --port=@var{port}
+  port to listen on (default @samp{10809})
+@item -o, --offset=@var{offset}
+  offset into the image
+@item -b, --bind=@var{iface}
+  interface to bind to (default @samp{0.0.0.0})
+@item -k, --socket=@var{path}
+  Use a unix socket with path @var{path}
+@item -f, --format=@var{format}
+  Set image format as @var{format}
+@item -r, --read-only
+  export read-only
+@item -P, --partition=@var{num}
+  only expose partition @var{num}
+@item -s, --snapshot
+  use @var{filename} as an external snapshot, create a temporary
+  file with backing_file=@var{filename}, redirect the write to
+  the temporary one
+@item -l, --load-snapshot=@var{snapshot_param}
+  load an internal snapshot inside @var{filename} and export it
+  as an read-only device, @var{snapshot_param} format is
+  'snapshot.id=[ID],snapshot.name=[NAME]' or '[ID_OR_NAME]'
+@item -n, --nocache
+@itemx --cache=@var{cache}
+  set cache mode to be used with the file.  See the documentation of
+  the emulator's @code{-drive cache=...} option for allowed values.
+@item --aio=@var{aio}
+  choose asynchronous I/O mode between @samp{threads} (the default)
+  and @samp{native} (Linux only).
+@item --discard=@var{discard}
+  toggles whether @dfn{discard} (also known as @dfn{trim} or @dfn{unmap})
+  requests are ignored or passed to the filesystem.  The default is no
+  (@samp{--discard=ignore}).
+@item -c, --connect=@var{dev}
+  connect @var{filename} to NBD device @var{dev}
+@item -d, --disconnect
+  disconnect the specified device
+@item -e, --shared=@var{num}
+  device can be shared by @var{num} clients (default @samp{1})
+@item -f, --format=@var{fmt}
+  force block driver for format @var{fmt} instead of auto-detecting
+@item -t, --persistent
+  don't exit on the last connection
+@item -v, --verbose
+  display extra debugging information
+@item -h, --help
+  display this help and exit
+@item -V, --version
+  output version information and exit
+@end table
+
+@c man end
+
+@ignore
+
+@setfilename qemu-nbd
+@settitle QEMU Disk Network Block Device Server
+
+@c man begin AUTHOR
+Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.
+This is free software; see the source for copying conditions.  There is NO
+warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+@c man end
+
+@c man begin SEEALSO
+qemu-img(1)
+@c man end
+
+@end ignore