cgread man page on FreeBSD

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CGREAD(3)		 BSD Library Functions Manual		     CGREAD(3)

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

LIBRARY
     library “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 c into the d_cg field of a userland UFS disk struc‐
     ture.  It sets the d_lcg field to the cylinder group number 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 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 speci‐
     fied 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 FreeBSD 5.1.

AUTHORS
     Juli Mallett ⟨jmallett@FreeBSD.org⟩

BSD				 June 4, 2003				   BSD
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