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- .TH SWAP 8
- .SH NAME
- swap \- establish a swap file
- .SH SYNOPSIS
- .B swap
- .I file
- .SH DESCRIPTION
- .I Swap
- establishes a file or device for the system to swap on.
- If
- .I file
- is a device, the device is used directly; if a directory,
- a unique file is created in that directory on which to swap.
- The environment variable
- .B 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 configured
- at system boot time.
- .PP
- 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.
- .SH SOURCE
- .B /sys/src/cmd/swap.c
- .SH BUGS
- Swapping to a file served by a local user-level process, such as
- .IR kfs (4),
- can lead to deadlock; use raw devices or remote files instead.
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