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33 .Nd control devices for interleaved paging/swapping
41 .Fn swapon "const char *special"
43 .Fn swapoff "const char *special" "u_int flags"
48 makes the block device
50 available to the system for
51 allocation for paging and swapping.
52 The names of potentially
53 available devices are known to the system and defined at system
55 The size of the swap area on
57 is calculated at the time the device is first made available
62 system call disables paging and swapping on the given device.
63 All associated swap metadata are deallocated, and the device
64 is made available for other purposes.
68 argument points to the name of the device or file used for swapping.
71 argument takes the following flags:
72 .Bl -tag -width SWAPOFF_FORCE
74 Overrides a very conservative check that prevents swapoff
75 if the total amount of free memory and remaining swap
76 devices space might be unsufficient for the system to continue
80 If an error has occurred, a value of -1 is returned and
82 is set to indicate the error.
91 A component of the path prefix is not a directory.
92 .It Bq Er ENAMETOOLONG
93 A component of a pathname exceeded 255 characters,
94 or an entire path name exceeded 1023 characters.
96 The named device does not exist.
98 Search permission is denied for a component of the path prefix.
100 Too many symbolic links were encountered in translating the pathname.
102 The caller is not the super-user.
107 points outside the process's allocated address space.
112 can fail for the following reasons:
118 is not a block device.
120 The device specified by
123 been made available for swapping
125 The major device number of
127 is out of range (this indicates no device driver exists
128 for the associated hardware).
130 An I/O error occurred while opening the swap device.
132 Corrupted data was detected while reading from the file system to open the
141 The system is not currently swapping to
144 Not enough virtual memory is available to safely disable
145 paging and swapping to the given device.
154 system call appeared in
158 system call appeared in