SWAP(8) SWAP(8)
NAME
swap - establish a swap file
SYNOPSIS
swap file
DESCRIPTION
Swap establishes a file for the system to swap on. If file
is an existing file, it is used for system swap. If it does
not exist, a new file is created. If file is a directory, a
unique file is created in that directory on which to swap.
The environment variable swap is set to the full name of the
resulting file. The number of blocks available in the file
or device must be at least the number of swap blocks config-
ured at system boot time.
If a swap channel has already been set and no blocks are
currently valid in the file the old file will be closed and
then replaced. If any blocks are valid on the device an
error is returned instead.
SOURCE
/sys/src/cmd/swap.c
BUGS
Swapping to a file served by a local user-level process will
lead to deadlock if the process isn't made non-swappable
(see the noswap ctl-message in proc(3)).
SEE ALSO
swap(3), proc(3)
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