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28 .\" @(#)swapon.2 8.1 (Berkeley) 6/4/93
36 .Nd control devices for interleaved paging/swapping
44 .Fn swapon "const char *special"
46 .Fn swapoff "const char *special" "u_int flags"
51 makes the block device
53 available to the system for
54 allocation for paging and swapping.
55 The names of potentially
56 available devices are known to the system and defined at system
58 The size of the swap area on
60 is calculated at the time the device is first made available
65 system call disables paging and swapping on the given device.
66 All associated swap metadata are deallocated, and the device
67 is made available for other purposes.
71 argument points to the name of the device or file used for swapping.
74 argument takes the following flags:
75 .Bl -tag -width SWAPOFF_FORCE
77 Overrides a very conservative check that prevents swapoff
78 if the total amount of free memory and remaining swap
79 devices space might be unsufficient for the system to continue
83 If an error has occurred, a value of -1 is returned and
85 is set to indicate the error.
94 A component of the path prefix is not a directory.
95 .It Bq Er ENAMETOOLONG
96 A component of a pathname exceeded 255 characters,
97 or an entire path name exceeded 1023 characters.
99 The named device does not exist.
101 Search permission is denied for a component of the path prefix.
103 Too many symbolic links were encountered in translating the pathname.
105 The caller is not the super-user.
110 points outside the process's allocated address space.
115 can fail for the following reasons:
121 is not a block device.
123 The device specified by
126 been made available for swapping
128 The major device number of
130 is out of range (this indicates no device driver exists
131 for the associated hardware).
133 An I/O error occurred while opening the swap device.
135 Corrupted data was detected while reading from the file system to open the
144 The system is not currently swapping to
147 Not enough virtual memory is available to safely disable
148 paging and swapping to the given device.
157 system call appeared in
161 system call appeared in