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swapoff (2)
  • >> swapoff (2) ( FreeBSD man: Системные вызовы )
  • swapoff (2) ( Русские man: Системные вызовы )
  • swapoff (2) ( Linux man: Системные вызовы )
  • swapoff (8) ( FreeBSD man: Команды системного администрирования )
  • swapoff (8) ( Linux man: Команды системного администрирования )

  • BSD mandoc
     

    NAME

    
    
    swapon , swapoff
    
     - control devices for interleaved paging/swapping
    
     
    

    LIBRARY

    Lb libc
    
     
    

    SYNOPSIS

       #include <unistd.h>
    int swapon (const char *special);
    int swapoff (const char *special);
     

    DESCRIPTION

    The swapon ();
    system call makes the block device Fa special available to the system for allocation for paging and swapping. The names of potentially available devices are known to the system and defined at system configuration time. The size of the swap area on Fa special is calculated at the time the device is first made available for swapping.

    The swapoff ();
    system call disables paging and swapping on the given device. All associated swap metadata are deallocated, and the device is made available for other purposes.  

    RETURN VALUES

    If an error has occurred, a value of -1 is returned and errno is set to indicate the error.  

    ERRORS

    Both swapon ();
    and swapoff ();
    can fail if:

    Bq Er ENOTDIR
    A component of the path prefix is not a directory.
    Bq Er ENAMETOOLONG
    A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters.
    Bq Er ENOENT
    The named device does not exist.
    Bq Er EACCES
    Search permission is denied for a component of the path prefix.
    Bq Er ELOOP
    Too many symbolic links were encountered in translating the pathname.
    Bq Er EPERM
    The caller is not the super-user.
    Bq Er EFAULT
    The Fa special argument points outside the process's allocated address space.

    Additionally, swapon ();
    can fail for the following reasons:

    Bq Er EINVAL
    The system has reached the boot-time limit on the number of swap devices, vm.nswapdev
    Bq Er ENOTBLK
    The Fa special argument is not a block device.
    Bq Er EBUSY
    The device specified by Fa special has already been made available for swapping
    Bq Er ENXIO
    The major device number of Fa special is out of range (this indicates no device driver exists for the associated hardware).
    Bq Er EIO
    An I/O error occurred while opening the swap device.

    Lastly, swapoff ();
    can fail if:

    Bq Er EINVAL
    The system is not currently swapping to Fa special .
    Bq Er ENOMEM
    Not enough virtual memory is available to safely disable paging and swapping to the given device.

     

    SEE ALSO

    config(8), swapon(8), sysctl(8)  

    HISTORY

    The swapon ();
    system call appeared in BSD 4.0 The swapoff ();
    system call appeared in Fx 5.0 .


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    SEE ALSO
    HISTORY


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