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cgread1 (3)
  • >> cgread1 (3) ( FreeBSD man: Библиотечные вызовы )

  • BSD mandoc
     

    NAME

    
    
    cgread , cgread1, cgwrite1
    
     - read/write cylinder groups of UFS disks
    
     
    

    LIBRARY

    Lb libufs
    
     
    

    SYNOPSIS

       #include <sys/param.h>
       #include <sys/mount.h>
       #include <ufs/ufs/ufsmount.h>
       #include <ufs/ufs/dinode.h>
       #include <ufs/ffs/fs.h>
       #include <libufs.h>
    int cgread (struct uufsd *disk);
    int cgread1 (struct uufsd *disk int c);
    int cgwrite1 (struct uufsd *disk int c);
     

    DESCRIPTION

    The cgread ();
    and cgread1 ();
    functions provide cylinder group reads for libufs(3) consumers. The cgread1 ();
    function reads from one cylinder group, specified by Fa c into the d_cg field of a userland UFS disk structure. It sets the d_lcg field to the cylinder group number Fa c .

    The cgread ();
    function operates on sequential cylinder groups. Calling the cgread ();
    function is equivalent to calling cgread1 ();
    with a cylinder group specifier equivalent to the value of the current d_ccg field, and then incrementing the d_ccg field.

    The cgwrite1 ();
    function stores cylinder group specified by Fa c from d_cg field of a userland UFS disk structure on disk.  

    RETURN VALUES

    Both functions return 0 if there are no more cylinder groups to read, 1 if there are more cylinder groups, and -1 on error.  

    ERRORS

    The function cgread ();
    may fail and set errno for any of the errors specified for the library function bread(3).

    The function cgread1 ();
    has semantically identical failure conditions to those of cgread (.);

    The function cgwrite1 ();
    may fail and set errno for any of the errors specified for the library function bwrite(3).  

    SEE ALSO

    bread(3), bwrite(3), libufs(3)  

    HISTORY

    These functions first appeared as part of libufs(3) in Fx 5.1 .  

    AUTHORS

    An Juli Mallett Aq [email protected]


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    SEE ALSO
    HISTORY
    AUTHORS


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