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kvm_getswapinfo ()
  • >> kvm_getswapinfo (3) ( FreeBSD man: Библиотечные вызовы )

  • BSD mandoc
     

    NAME

    
    
    kvm_getswapinfo
    
     - return swap summary statistics for the system
    
     
    

    LIBRARY

    Lb libkvm
    
     
    

    SYNOPSIS

       #include <kvm.h>
    int kvm_getswapinfo (kvm_t *kd struct kvm_swap * int maxswap int flags);
     

    DESCRIPTION

    The kvm_getswapinfo ();
    function fills an array of Vt kvm_swap structures with swap summary information for each swap device, for up to Fa maxswap - 1 devices. The number of devices, up to Fa maxswap - 1, is returned. A grand total of all swap devices (including any devices that go beyond Fa maxswap - 1) is returned in one additional array entry. This entry is not counted in the return value. Thus, if you specify a Fa maxswap value of 1, the function will typically return the value 0 and the single Vt kvm_swap structure will be filled with the grand total over all swap devices. The grand total is calculated from all available swap devices whether or not you made room for them all in the array. The grand total is returned.

    The flags argument is currently unused and must be passed as 0.

    If an error occurs, -1 is returned.

    Each swap partition and the grand total is summarized in the Vt kvm_swap structure. This structure contains the following fields:

    char ksw_devname[]
    int ksw_total
    int ksw_used
    int ksw_flags

    Values are in PAGE_SIZE 'd chunks (see getpagesize(3)). ksw_flags contains a copy of the swap device flags.  

    CACHING

    This function caches the nlist values for various kernel variables which it reuses in successive calls. You may call the function with Fa kd == NULL to clear the cache.  

    DIAGNOSTICS

    If the load average was unobtainable, -1 is returned; otherwise, the number of swap devices actually retrieved is returned.

    If the name of the swap device does not fit in the static char buffer in the structure, it is truncated. The buffer is always zero terminated.  

    SEE ALSO

    kvm(3)


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    CACHING
    DIAGNOSTICS
    SEE ALSO


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