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NetBSD 6.1.5 - man page for vattr_null (netbsd section 9)

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VATTR(9)			  BSD Kernel Developer's Manual 			 VATTR(9)

     vattr, vattr_null -- vnode attributes

     #include <sys/param.h>
     #include <sys/vnode.h>

     vattr_null(struct vattr *vap);

     Vnode attributes describe attributes of a file or directory including file permissions,
     owner, group, size, access time and modification time.

     A vnode attribute has the following structure:

     struct vattr {
	     enum vtype      va_type;	     /* vnode type (for create) */
	     mode_t	     va_mode;	     /* files access mode and type */
	     nlink_t	     va_nlink;	     /* number of references to file */
	     uid_t	     va_uid;	     /* owner user id */
	     gid_t	     va_gid;	     /* owner group id */
	     dev_t	     va_fsid;	     /* file system id (dev for now) */
	     ino_t	     va_fileid;      /* file id */
	     u_quad_t	     va_size;	     /* file size in bytes */
	     long	     va_blocksize;   /* blocksize preferred for i/o */
	     struct timespec va_atime;	     /* time of last access */
	     struct timespec va_mtime;	     /* time of last modification */
	     struct timespec va_ctime;	     /* time file changed */
	     struct timespec va_birthtime;   /* time file created */
	     u_long	     va_gen;	     /* generation number of file */
	     u_long	     va_flags;	     /* flags defined for file */
	     dev_t	     va_rdev;	     /* device the special file represents */
	     u_quad_t	     va_bytes;	     /* bytes of disk space held by file */
	     u_quad_t	     va_filerev;     /* file modification number */
	     u_int	     va_vaflags;     /* operations flags, see below */
	     long	     va_spare;	     /* remain quad aligned */

     A field value of VNOVAL represents a field whose value is unavailable or which is not to be
     changed.  Valid flag values for va_flags are:

	   VA_UTIMES_NULL  utimes argument was NULL
	   VA_EXCLUSIVE    exclusive create request

     Vnode attributes for a file are set by the vnode operation VOP_SETATTR(9).  Vnode attributes
     for a file are retrieved by the vnode operation VOP_GETATTR(9).  For more information on
     vnode operations see vnodeops(9).

	      Set vnode attributes in vap to VNOVAL.

     vattr_null() is implemented in sys/kern/vfs_subr.c.

     intro(9), vfs(9), vnode(9), vnodeops(9)

BSD					 January 8, 2010				      BSD
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